<PAGE>   1



                                                            CONFORMED AS AMENDED


                     FIRMAMENTO MEXICANO, S. DE R.L. DE C.V.

                              MEMBERSHIP AGREEMENT

     Amended and Restated Membership Agreement, dated and effective as of the
21st day of August, 1998, among Loral SatMex Ltd., a company organized under the
laws of the Islands of Bermuda ("Loral") and Ediciones Enigma, S.A. de C.V., a
sociedad anonima de capital variable organized under the laws of Mexico ("EE"
and, together with Loral, the "Members"), and Firmamento Mexicano, S. de R.L. de
C.V., a sociedad de responsibilidad limitada de capital variable organized under
the laws of Mexico (the "Company"). Certain terms used in this Agreement are
defined in Section 8 hereof.

                                 R E C I T A L S

     WHEREAS, the Company has been created with an authorized capital of
P$1,170,050,000, which capital is divided into voting capital represented by
Class A Social Parts and Class B Social Parts (collectively, the "Voting
Capital") and non-voting capital represented by Class N Social Parts (the
"Non-Voting Capital"). The authorized Voting Capital and Non-Voting Capital was
subscribed on November 17, 1997 by Loral and EE in the following amounts and in
exchange for issuance of the following Social Parts:

     EE:

     1.   a Class A Social Part representing invested capital of P$25,500 and
          constituting 51% of the total Voting Capital.

     2.   a Class N Social Part representing invested capital of P$409,492,000
          and constituting 35% of the total Non-Voting Capital.

     LORAL:

     1.   a Class B Social Part representing invested capital of P$24,500 and
          constituting 49% of the total Voting Capital.


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     2.   a Class N Social Part representing invested capital of P$760,508,000
          and constituting 65% of the total Non-Voting Capital.

     WHEREAS, the Company owns all but one share of the issued and outstanding
capital stock of Servicios Corporativos Satelitales, S.A. de C.V. ("Satmex
Holdings"), which in turn owns all but two shares of the issued and outstanding
capital stock of Corporativo Satelites Mexicanos, S.A. de C.V. (the "Acquisition
Sub"). The Acquisition Sub was formed for the purpose of making the acquisition
of 75% of the equity interest of Satelites Mexicanos, S.A. de C.V. (the
"Acquisition");

     WHEREAS, the amounts invested by EE and Loral in the Company have been used
to fund, through the Acquisition Sub, a portion of the purchase price payable at
the first closing of the Acquisition;

     WHEREAS, the second closing of the Acquisition will occur on December 29,
1997 and in connection therewith, Loral and EE may be required pursuant to the
terms of the Financing Documents to make certain Additional Capital
Contributions to the Company; and

     WHEREAS, the Members and the Company desire to promote their mutual
interests by agreeing to certain matters relating to the Additional Capital
Contribution, the operations and governance of the Company and the Companies
Entities and the disposition and voting of Social Parts.

     NOW, THEREFORE, in consideration of the mutual covenants and agreements
herein contained, the parties hereto hereby agree as follows:

1.   ADDITIONAL CAPITAL CONTRIBUTION; SOCIAL PART CERTIFICATES

     (a) Each of Loral and EE hereby agrees that if an Additional Capital
Contribution is required, then it shall, in accordance with the terms set forth
below, fund 65% and 35%, respectively, of the amount of such Additional Capital
Contribution by increasing the authorized equity capital of the Company in such
amount, which increase will be allocated among Voting Capital and Non-Voting
Capital in the same proportion as the initial funding and which increased
capital will be subscribed by Loral and EE in the same proportions as the
initial funding such that the percentage of Voting Capital and Non-Voting
Capital of each of Loral and EE remains unchanged.



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     (b) Closing. The closing of any such sales and purchases shall take place
at 9:00 A.M., New York City time, on the date of the second closing of the
Acquisition, at the offices of Sanchez Mejorada Velasco y Valencia, Paseo de la
Reforma 450, Lomas de Chapultepec, 11000 Mexico, D.F., or such other location as
the Members shall mutually select.

     (c) Application of Proceeds. The initial capital contribution, as well as
any Additional Capital Contribution was and shall be used to fund the
Acquisition. Such funding was and shall be effected by a contribution of the
invested capital by the Company to its Subsidiaries.

     (d) Legends. The certificates evidencing the Social Parts subscribed by the
Members, will bear the legend set forth in Section 5(d) and the following legend
reflecting the restrictions on the transfer of such interests contained in this
Agreement:

          "The Social Parts evidenced hereby are subject to the terms of that
     certain Membership Agreement dated and effective as of November 17, 1997,
     by and among the Company and certain Members identified therein, including
     certain restrictions on transfer. A copy of this Agreement is available
     upon request to the Company."

2.   GOVERNANCE

     (a) Election of Directors. The Members and the Company shall take all
action within their respective power, including, but not limited to, the voting
of all Voting Capital owned by them to cause the Board of Directors of the
Company to consist of five (5) members or such other odd number as the Members
may from time to time establish (the "Authorized Number"), which shall at all
times throughout the term of this Agreement (except as set forth in Section 4(e)
hereof) be comprised of (i) directors equal to a simple majority of the
Authorized Number and holding a simple majority of the votes entitled to be cast
by directors at any meeting of the Board, each such director to be designated by
EE (each, an "EE Director"), and (ii) the remaining director(s) to be designated
by Loral (each, a "Loral Director"). For so long as EE designates the majority
of directors of the Board of the Company pursuant to the foregoing sentence, EE
shall nominate the Chairman of the Board of the Company and the Members agree
that they shall take all action within their respective



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<PAGE>   4


power to elect such nominee. For so long as EE designates the Chairman of the
Board of the Company, Loral shall have the right to nominate the Secretary of
the Board (and his alternate) and the Members agree that they shall take all
action within their respective power to elect such nominee, which Secretary
shall not be a member of the Board for any purpose and shall not count as a
Loral Director. The Company shall cause the Board of Directors of SatMex and any
other direct or indirect subsidiary of the Company to be constituted in an
identical manner unless determined otherwise by the Board of Directors of the
Company by a Consensus Vote provided that the Board of Directors of SatMex shall
have such additional directors (not appointed by either Loral or EE) as may be
required pursuant to Mexican law or the by-laws of SatMex. Each of Loral and EE
shall have the authority to designate alternate directors (each a "Designated
Alternate") to substitute for the Loral Directors or EE Directors, as the case
may be, in accordance with the bylaws of the Company Entities. As of the date
hereof, the Board of each Company Entity (as defined below) shall consist of
those persons set forth on Schedule I hereto.

     (b) Replacement Directors. Each Loral Director or EE Director is subject to
removal at any time for any reason or for no reason by the Member who designated
him or her. If, at any time, a vacancy is created on the Board of any Company
Entity by reason of the death, removal or resignation of any Loral Director or
EE Director, the Member who designated such director shall, within five days
after the date such vacancy first occurs, take such action as is reasonably
necessary, including the voting of all Voting Capital held by it, to elect a
director or directors designated in accordance with Section 2(a) hereof to fill
such vacancy or vacancies; provided, that during such five day period following
the creation of the vacancy, the Board of such Company Entity shall not transact
any other business except by Consensus Vote. Each Member agrees that it will
vote or execute a written consent with respect to all of its Voting Capital to
effectuate the intent of this Section 2(b).

     (c) Quorum; Required Vote. A quorum of any meeting of the Board of any
Company Entity shall require the presence of a majority of the Board, which
shall include at least one Loral Director and one EE Director. No action at any
meeting may be taken by the Board unless a quorum is present and notice therefor
(setting forth all actions to be taken at such meeting) is duly given at least
five business days before the date of the meeting (or unless duly waived by the
directors in accordance with the by-laws). No resolution, action or decision
required or permitted to be taken, adopted or made by the Board of any Company
Entity shall be so taken, adopted or made without a vote of the majority of all
directors present, provided that if the matter being considered is an
Extraordinary Matter, the approval of at least one Loral Director and one EE
Director shall be



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<PAGE>   5


required (a "Consensus Vote"). Any such resolution, action or decision may also
be taken, adopted or made by unanimous written consent.

     (d) Mutual Approvals Required for Certain Action. A Consensus Vote, or if
the matter requires approval by shareholders or members under Mexican law or the
by-laws of the Company Entities, the approval of each Member, shall be required
to approve and authorize any of the following matters with respect to any
Company Entity (each, an "Extraordinary Matter"):

          (i) New Line of Business. Engagement by the Company Entities in any
     business other than that conducted on the date hereof or as set forth in
     the Business Plan and any business directly related to such business, in
     each case, as such business or businesses may, from time to time develop,
     provided, that such related business or developed business does not
     constitute a material change in the nature of the business of the Company
     Entities as it is conducted on the date hereof or as set forth in the
     Business Plan.

          (ii) Transfer of Material Assets. Sell, lease (as lessor), transfer,
     mortgage, assign, pledge, exchange or otherwise dispose of all or
     substantially all of the assets of any of the Company Entities.

          (iii) Merger or Liquidation. Approve any transaction or merger,
     consolidation, amalgamation, recapitalization or other form of business
     combination, or any liquidation, winding up or dissolution of any of the
     Company Entities or any other transaction in which a Company Entity is not
     the surviving entity.

          (iv) Voluntary Bankruptcy. Commence a voluntary case under the
     applicable Mexican bankruptcy code, as now or hereafter in effect, or any
     successor thereto, or any other proceeding under any reorganization,
     arrangement, adjustment of debt, relief of debtors, dissolution,
     insolvency, liquidation or similar law under any other jurisdiction or make
     a general assignment for the benefit of creditors.

          (v) Organizational Documents. Amend in any material manner the
     articles of incorporation or by-laws or organizational documents of any of
     the Company Entities, except as contemplated in the SatMex Stock Purchase
     Agreement.



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          (vi) Adoption of or Amendments to the Business Plan. Adopt or amend in
     any material manner the Business Plan.

          (vii) Dividends and Distributions; Redemption and Repurchase; Dividend
     Policy. Declare or pay any dividends or distributions (other than (i) to
     the Company or (ii) in the case of SatMex, in accordance with the SatMex
     Dividend Policy) or repurchase or redeem any equity securities of any of
     the Company Entities except as set forth in Section 4(f). Amend in any
     manner the SatMex Dividend Policy.

          (viii) Affiliated Parties. Enter into or engage in transactions with
     entities directly or indirectly, controlling, controlled by or under common
     control of either of the Members other than the Permitted Transactions. For
     such purposes, "control" shall mean the direct or indirect possession of
     the power to direct or cause the direction of the management and policies
     of a Person, whether through the ownership of Voting Control, by contract
     or otherwise.

          (ix) Significant Decisions. Any Significant Decision.

          (x) Budget. The adoption by the Company Entities of a Budget, as more
     fully described in Section 2(f).

          (xi) Capital Expenditures and Certain Actions. Except as provided in
     any Budget approved by a Consensus Vote, (i) any individual or series of
     related expenditures, commitments, obligations or agreements by any Company
     Entity in excess of US$1,000,000 or (ii) any commitment, arrangement or
     agreement outside of the ordinary course of business of the Company
     Entities, including without limitation entering into any joint venture or
     strategic alliances or partnerships.

          (xii) Incurrence or Payment of Indebtedness. Create, incur, guarantee,
     assume, refinance or pre-pay indebtedness of any Company Entities outside
     of the ordinary course of business except for the indebtedness contemplated
     by the Business Plan, the Bridge Note Commitment Letter, the Facility
     Commitment Letter, the Interim Facility, the Fixed Rate Financing and the
     Government Obligations and any refinancing of any of the foregoing.

          (xiii) Acquisitions. The direct or indirect loan or advance to, any
     acquisition of any business, assets, capital stock, equity interest or
     other security of, or other



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     investment in, any Person or Persons, in each case, by any Company Entity,
     in any transaction or in any series of related transactions, that involve
     or could reasonably be valued in excess of US$1,000,000, except for the
     transactions contemplated under the SatMex Stock Purchase Agreement.

          (xiv) Issuance of Securities. Approve any issuance of equity
     securities or any other security convertible, exercisable or exchangeable
     into equity securities of any Company Entity (other than to the Company or
     as contemplated in the Business Plan), including any option, warrant, put,
     call or other arrangement of any kind to purchase or otherwise receive from
     any Company Entity (other than to the Company or as contemplated in the
     Business Plan) any such securities outside of the ordinary course of
     business, except for (i) the issuance of warrants in connection with the
     High Yield Financing or as contemplated in the Bridge Commitment Letter and
     (ii) the issuance of securities pursuant to an employee stock option plan
     or similar plan adopted pursuant to a Consensus Vote in accordance with
     Section 2(d)(xix).

          (xv) Appointment, Suspension or Removal of Senior Officers;
     Compensation. Except as set forth in Section 2(h), any appointment,
     suspension or removal of any person who is, or upon appointment would be, a
     senior executive officer of any of the Company Entities and the
     determination of the compensation in respect of any such senior executive
     officer.

          (xvi) Engagement of Accountants. The engagement or dismissal of
     independent public accountants, whether in connection with an audit of the
     financial statements of the Company Entities or otherwise.

          (xvii) Accounting and Tax. Establish or modify the accounting or tax
     methods, practices, procedures or policies of the Company Entities except
     as required by law or generally accepted accounting principles.

          (xviii) Litigation and Arbitration. Commence any litigation or
     arbitration that pertains to any of the Company Entities or assets of any
     of the Company Entities or the settlement or any other material decision
     relating to a litigation, arbitration, governmental investigation or other
     proceeding, with a potential claim for damages in excess of US$1,000,000.




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          (xix) Employee Benefit Plans. Adopt, amend or make any grants pursuant
     to any employee benefit or stock option plans.

          (xx) Transfer of Telecommunications Licenses. Sell, lease (as lessor),
     transfer, mortgage, assign, pledge, exchange or otherwise dispose of the
     telecommunications licenses of the Company Entities, except as contemplated
     under the Facility Commitment Letter.

          (xxi) Certain Agreements. The entry into any agreement or arrangement
     to do any of the foregoing.

     (e) Management and Operating Decisions. The day and day management and
operation of SatMex, including the taking of such actions as may be necessary to
implement the Business Plan, shall be vested in the Chief Executive Officer and
the Chief Operating Officer of SatMex who shall have authority to approve all
decisions related thereto; provided, however, that any decision that would
impact the Operating Cash Flow, as set forth in the Business Plan, by more than
10% or US$10 million (a "Significant Decision") shall be approved by a Consensus
Vote of the Board of Directors as set forth in Section 2(d)(ix) above. The Chief
Operating Officer shall report to the Chief Executive Officer of SatMex and the
Executive Committee of SatMex and shall serve as Chief Executive Officer of
SatMex during any period in which there is a vacancy in the position of Chief
Executive Officer.

     (f) Budget Approval. (i) The Members shall consider and, if agreement is
reached, shall adopt and approve at least once each fiscal year, a budget for
the successive fiscal year. If any proposed budget, or any material amendment
thereto, is not approved by a Consensus Vote, then the last budget so approved
by the Members shall be extended as described below (the "Carry-Over Budget"),
until approval is received from by Consensus Vote.

     (ii) The Carry-Over Budget shall provide for (x) adjustments for the
greater of five percent (5%) per annum or the increase in the Consumer Price
Index in effect for the period in question, (y) any additional increases
necessary to meet (A) any payment escalation provisions of any authorized
contractual commitments of the Company Entities, or (B) any authorized
contractual commitments of the Company Entities, in either case to the extent
such contractual commitments shall have been previously approved by the Members
or by a Consensus Vote to the extent required by the provisions hereof or the
provisions of the By-laws or the Membership Agreement and (z) if any material
items set



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forth in the Budget shall be denominated in Pesos, a method for adjusting any
peso denominated amounts in the event of a material fluctuation in the
Peso-Dollar exchange rate.

     (g) Appointment of Officers.

     (i) Each Member and the Company hereby agrees to take such action as may be
necessary to appoint as officers to SatMex, effective as of the date hereof, as
follows: (A) as Chief Executive Officer, such individual as Loral and EE shall
mutually agree and who shall be a Mexican national, (B) as Chief Operating
Officer, such individual as may be designated by Loral, with the approval of EE,
which approval shall not be unreasonably withheld and (C) as all other executive
officers, such individuals as Loral and EE shall mutually agree. Schedule II
hereto sets forth the officers of SatMex as of the date hereof.

     (ii) Each Member and the Company hereby agrees to take such action as may
be necessary to appoint as officers to the Company, effective as of the date
hereof, as follows: (i) as President, such individual as may be designated by
EE, with the approval of Loral, which approval shall not be unreasonably
withheld, (ii) as Chief Executive Officer, such individual as may be designated
by Loral, with the approval of EE, which approval shall not be unreasonably
withheld, (iii) as Chief Operating Officer, such individual as may be designated
by Loral, with the approval of EE, which approval shall not be unreasonably
withheld and (iv) as Chief Financial Officer, such individual as may be
designated by EE, with the approval of Loral, which approval shall not be
unreasonably withheld. Schedule II hereto sets forth the officers of the Company
as of the date hereof.

     (iii) The officers of all other Company Entities shall be appointed by
their respective Board of Directors, if the members agree that they are needed.

     (h) Removal of Officers. The officers of SatMex shall be removed as
follows: (i) the Chief Executive Officer, by either EE or Loral, (ii) the Chief
Operating Officer, by Loral or by the Executive Committee if removal of such
officer was recommended to the Executive Committee by the Chief Executive
Officer and such recommendation was approved by the Executive Committee and
(iii) all other executive officers, by either EE or Loral or by the Executive
Committee if removal of such officer was recommended to the Executive Committee
by either the Chief Executive Officer or Chief Operating Officer and such
recommendation was approved by



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the Executive Committee. The officers of the Company shall be removed as
follows: (i) the President and Chief Financial Officer, by EE and (ii) the Chief
Executive Officer and Chief Operating Officer, by Loral. Each Member and the
Company hereby agrees to take such action as may be necessary to effect all such
removal and to appoint any successor to fill any vacancy resulting from such
removal or from the death or resignation of any officer in accordance with
Section 2(g) above.

     (i) Executive Committee. Each of the Members and the Company agrees to take
such action as shall be necessary to create an Executive Committee of the Board
of Directors of the Company and SatMex, which Executive Committee shall be
composed of one Loral Director and one EE Director. Schedule I hereto sets forth
the members of the Executive Committees as of the date hereof. The Executive
Committees shall be authorized to take action on all matters, including
Extraordinary Matters that may be authorized by the Board of Directors under
this Agreement or otherwise. Each of Loral and EE shall be authorized to
designate an alternate director to substitute for the Loral Director and EE
Director, as the case may be, on each Executive Committee (each an "Executive
Committee Alternate"). Schedule I hereto sets forth the Executive Committee
Alternates as of the date hereof.

     (j) Certain Actions of SatMex Board. Each of Loral and EE shall use its
reasonable best efforts to cause the directors of the Board of SatMex designated
by Loral or EE, as the case may be, to vote in favor of any action relating to
SatMex previously approved by the Board of the Company.

     (k) By-laws. The Members and the Company shall cause the provisions of this
Section 2 to be included in the by-laws of each of the Company Entities, as
applicable.

3.   DEADLOCK

     (a) Proposal. If either Loral or EE proposes a capital expenditure (the
"Proposing Member") in excess of US$1 million not provided for in the Business
Plan, but such expenditure is within the existing line of business of the
Company as described in Section 2(d)(i) (the "Proposal"), the Proposing Member
shall send to the other Member written notice of its intent to effect such a
capital expenditure and if within ten Business Days following receipt of such
notice such expenditure is opposed in writing by the other Member (the
"Objection"), the Proposing Member may, notwithstanding the provisions of
Section 2(d)(xi), implement the Proposal, and the other member (the "Opposing
Member") shall vote its Social Parts and otherwise cooperate to



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implement the Proposal, provided that the Opposing Member shall have the option,
exercisable by delivering to the Proposing Member written notice of its intent
to exercise its option under this Section 3(a), within 60 days after the date of
the Objection, to sell to the Proposing Member, and the Proposing Member shall
be required to purchase, all of the Social Parts of the Company held by the
Opposing Member and its Affiliates for Fair Market Value (as defined in Section
3(d)) as of the end of the fiscal quarter immediately preceding the date the
Proposal was made. If the Opposing Member is EE and it elects to exercise its
rights under this Section 3(a), Loral may, in its sole discretion, elect to
assign the right to purchase the Social Parts of the Company owned by EE to a
Qualified Mexican Person at a price negotiated with such buyer, provided that in
no event shall EE receive for its Social Parts less than the Fair Market Value
as of the end of the fiscal quarter immediately preceding the date the Proposal
was made.

     (b) EE Action. If EE causes any of the Company Entities to take any
material action not explicitly provided for in the Business Plan and Loral
opposes such action in writing within ten (10) Business Days from the day it
first becomes aware of such material action, then Loral, in its sole discretion,
shall have the option to provide EE with a written notice (the "Opposition
Notice") stating its opposition to the action and the reason it is material and
that the failure to cure such action within twenty days after receipt of the
Opposition Notice shall give rise to its option under this Section 3(b). No such
action shall be deemed material if it would not require a Consensus Vote or if
it does not involve the expenditure or incurrence of obligations in excess of US
$1 million. If EE does not cure such action within twenty days after receipt of
the Opposition Notice, Loral shall have the option, exercisable by delivering to
EE written notice of its intent to exercise its option under this Section 3(b)
within 60 days of the date of the Opposition Notice, to either: (i) sell to EE,
and EE shall be required to purchase, all of the Social Parts of the Company
held by Loral and its Affiliates at a price equal to 120% of the Fair Market
Value of such Social Parts as of the end of the fiscal quarter immediately
preceding the date such action was taken, or (ii) purchase from EE and EE shall
be required to sell, all of the Social Parts of the Company held by EE and its
Affiliates for cash in an amount equal to the Fair Market Value of such Social
Parts as of the end of the fiscal quarter immediately preceding the date such
action was taken, provided that such exercise shall be conditioned upon Loral
identifying a Qualified Mexican Person willing to purchase



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the Social Parts of the Company owned by EE and its Affiliates at such Fair
Market Value.

     (c) Loral Inaction. If Loral fails to approve any material matter which
requires a Loral vote and which is provided for in the Business Plan and EE
approves such a matter and has given Loral written notice (the "Warning Notice")
that such failure to approve the matter gives rise to its option under this
Section 3(c), then unless Loral grants such approval within twenty (20) days
after receipt of such notice, then EE shall have the option, exercisable by
delivering to Loral written notice of its intent to exercise its option under
this Section 3(c) within sixty (60) days of the date of such notice, to either:
(i) sell to Loral, and Loral shall be required to purchase, all of the Social
Parts of the Company held by EE and its Affiliates at a price equal to 120% of
the Fair Market Value of such Social Parts as of the end of the fiscal quarter
immediately preceding the date of the Warning Notice, as (ii) purchase from
Loral and Loral shall be required to sell, all of the Social Parts of the
Company held by Loral and its Affiliates for cash in an amount equal to the Fair
Market Value of such Social Parts as of the end of the fiscal quarter
immediately preceding the date of the Warning Notice. No such action will be
deemed material if it would not require a Consensus Vote or if it does not
involve the expenditure or incurrence of obligations in excess of US $1 million.

     (d) Determination of Fair Market Value. The determination of the fair
market value (the "Fair Market Value") of the Social Parts described in Section
3(a) - 3(c) above shall be made in accordance with this Section 3(d). Promptly
upon receipt by a Member of a call or put notice, as the case may be, under
Sections 3(a), 3(b) or 3(c) above, each Member shall promptly appoint as an
appraiser an internationally-recognized investment banking firm (a "recognized
investment banking firm"). Each appraiser shall, within thirty (30) days of
appointment, separately investigate the value of the Social Parts to be
purchased or sold, as the case may be, as of the proposed transfer date and
shall submit a notice of an appraisal of that value to each Member. If the
appraised values of such consideration (the "Earlier Appraisals") vary by less
than ten percent (10%), the average of the two appraisals on a per unit basis
shall be controlling as the fair market value. If the appraised values vary by
more than ten percent (10%), the appraisers, within ten (10) days of the
submission of the last appraisal, shall appoint a third appraiser which shall be
a recognized investment banking firm. The third appraiser shall, within thirty
(30) days of its appointment, appraise the fair market value of the Social Parts
in question as of the proposed



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transfer date and submit notice of its appraisal to each Member. The value
determined by the third appraiser shall be controlling as the fair market value
of the Social Parts unless the value is greater than the two Earlier Appraisals,
in which case the higher of the two Earlier Appraisals will control, and unless
the value is lower than the two Earlier Appraisals, in which case the lower of
the two Earlier Appraisals will control. If any Member fails to appoint an
appraiser or if one of the two initial appraisers fails after appointment to
submit its appraisal within the required period, the appraisal submitted by the
remaining appraiser shall be controlling. Each Member shall bear the cost of its
respective appointed appraiser. The cost of the third appraisal shall be shared
equally between the Members.

     (e) Closing. Within the later of 30 days after the date on which the fair
market value of the Social Parts is finally determined pursuant to Section 3(d),
the Member selling the Social Parts, whether pursuant to a call or a put option,
as the case may be, shall convey to the purchasing Member all of the Social
Parts then held by it or its Affiliates, free and clear of all liens, claims and
encumbrances, and the purchasing Member shall deliver cash to the selling Member
equal to the appropriate amount in consideration therefor, at a closing to be
held at the offices of the Company or at such other place as shall be agreed to
by the Members.

4.   TRANSFER OF STOCK

     (a) Resale of Social Parts. No Member shall Transfer any Social Parts other
than in accordance with the provisions of this Section 4. Any Transfer or
purported Transfer made in violation of this Section 4 shall be null and void
and of no effect.

     (b) Rights of First Offer.

     (i) If a Member proposes to Transfer any of the Social Parts owned by it
other than in a Permitted Transfer, then the Member desiring to make the
Transfer (hereinafter referred to as the "Transferor") must first make the offer
to sell the Social Parts to the other Member (the "Other Member").

     (ii) Offer by Transferor. Copies of the Transferor's offer shall be given
to the Other Member and shall consist of an offer to sell to the Other Member,
for cash, all of the Social Parts then proposed to be transferred by the
Transferor (the "Subject Social Parts") upon customary terms and conditions,
representations,



                                      -13-
<PAGE>   14


warranties and covenants, at a cash price designated by the Transferor (the
"Stated Price").

     (iii) Acceptance of Offer. Within twenty (20) days after the receipt of the
offer described in Section 4(b)(ii), the Other Member may, at its option, elect
to purchase all, but not less than all, of the Subject Social Parts for the
Stated Price on the terms and conditions set forth in such offer. The Other
Member shall exercise such option by giving notice to the Transferor, in which
event the notice required to be given by the purchasing party (the "Purchaser")
shall specify a date for the closing of the purchase which shall not be more
than thirty (30) days after the date of the giving of such notice. If the Other
Member does not accept the offer by the twentieth day following the date the
offer was received, it shall be deemed to have waived all its rights under this
Section 4(b)(iii) with respect to such offer.

     (iv) Closing of Purchase. The closing of the purchase shall take place at
the office of the Company or such other location as shall be mutually agreeable
and the Stated Price shall be paid at the closing. At the closing, the
Transferor shall cause the Company to deliver to the Purchaser new certificates
evidencing the Subject Social Parts to be conveyed.

     (v) Release from Restriction; Termination of Rights. If the offer to sell
is not accepted by the Other Member, the Transferor shall be free for six months
following the period described in Section 4(b)(iii) above to solicit offers for
the Social Parts, provided that (A) the Transferor shall not offer or sell the
Social Parts at a price that is less than 98% of the Stated Price, and if the
sale to the third party is other than entirely for cash, the Transferor shall
certify to the other Member as to the cash value of any noncash consideration,
(B) such Transfer shall be made only in strict accordance with the other terms
of the offer described in Section 4(b)(ii) and (C) the transferee agrees, in
writing, to be bound by the provisions of this Agreement. In the event that the
Transferor shall have failed to effect a sale of the Social Parts in compliance
with the requirements of (A), (B) and (C) above in the six month period provided
herein or shall have offered the Social Parts to third parties at a price that
is less than 98% of the Stated Price, the restrictions provided for herein shall
again become effective, and no transfer of Social Parts may be made thereafter
without again offering



                                      -14-
<PAGE>   15


the same in accordance with this Section 4(b). Any purported transfer of the
Social Parts which contravenes any of this Section 4(b)(v) shall be deemed null
and void.

     (vi) Assignment by Loral. The parties hereto agree that if EE is the
Transferor, Loral shall be free to assign its rights under this Section 4(b) to
a Qualified Mexican Person upon written notice to EE of its intent to do so,
which notice shall state the name and address of the Qualified Mexican Person,
and following the date of such notice, the Qualified Mexican Person shall be
treated as the Other Member for all purposes of this Section 4(b).

     (vii) Limitations. The provisions of this Section 4(b) shall not apply to
sales by Tag-Along Holders (as defined below) pursuant to Section 4(c) hereof.

     (c) Tag-Along Rights.

     (i) In the event any Member intends to Transfer any or all of its Social
Parts (excluding a Permitted Transfer but including Transfers made to third
parties pursuant to Section 4(b)(v)), such Member (the "Selling Member") shall
notify the other Member (the "Tag-Along Holder"), in writing, of such proposed
Transfer, the name of the third party and its terms and conditions. Within
twenty (20) days of the date of such notice, the Tag-Along Member shall notify
the Selling Member if it elects to participate in such Transfer. If the
Tag-Along Holder fails to notify the Selling Member within such twenty (20) day
period, it shall be deemed to have waived its rights hereunder. Upon
notification by the Tag-Along Holder of its intent to exercise its rights under
this Section 4(c), the Tag-Along Holder shall have the right to sell, at the
same price and on the same terms and conditions as the Selling Member, an amount
of Social Parts equal to the Social Parts the third party actually proposes to
purchase multiplied by a fraction, the numerator of which shall be the number of
Social Parts issued and owned by the Tag-Along Holder and the denominator of
which shall be the aggregate number of Social Parts issued and owned by the
Selling Member and the Tag-Along Holder. The Selling Member agrees that, in such
event, it will reduce the amount of Social Parts to be sold by it to such third
party by a corresponding amount. If, however, the Selling Member proposes to
sell all of its Social Parts and the third party shall have agreed to purchase
all the Social Parts held by the Selling Member and the Tag-Along Holder, the
Tag-Along Holder shall have the



                                      -15-
<PAGE>   16


right to sell at the same price and on the same terms and conditions as the
Selling Member all of its Social Parts.

     (ii) Notwithstanding anything contained in this Section 4(c), in the event
that all or a portion of the purchase price consists of securities and the sale
of such securities to the Tag-Along Holder would require either a registration
under the Securities Act or the preparation of a disclosure document pursuant to
Regulation D under the Securities Act (or any successor regulation) or a similar
provision of any jurisdiction's securities law (and such sale would not
otherwise have been registered under the Securities Act), then, at the option of
the Selling Member, the Tag-Along Holder may receive, in lieu of such
securities, the fair market value of such securities in cash, as may be
determined (A) in the case of publicly traded securities, by calculating the
average of the reported closing market prices per share of such securities for
the 10 consecutive trading days ending on the fifth trading day prior to the
closing date for such Transfer, (B) in the case of non-publicly traded
securities, as determined by a nationally recognized investment banking firm
appointed by a Consensus Vote, or (C) in such other manner as may be determined
by a Consensus Vote of the Board of Directors of the Company.

     (d) Minimum Holdings. EE hereby agrees that without the prior written
consent of Loral, it shall not Transfer any of its Social Parts, if immediately
following such Transfer, the direct and indirect ownership in the Company then
held by Qualified Mexican Persons is reduced to less than the number of Social
Parts required to be held by a Qualified Mexican Person under Mexican law.

     (e) Amendments to Applicable Mexican Law. Should the applicable Mexican law
be amended to allow Persons not organized under the laws of Mexico to hold a
majority of the voting securities of SatMex and the Company, the parties hereto
shall promptly take action to (i) amend the designation of the Class N Social
Parts to convert them into voting securities and (ii) amend the provisions of
Section 2(a)(i) to provide that the majority of the Board of Directors of the
Company Entities shall be designated by the Person holding a majority of the
Social Parts then outstanding. In addition, if so requested by EE at its option,
Loral shall thereafter negotiate in good faith with EE to exchange all Social
Parts in the Company held by EE and its Affiliates (the "EE Social Parts") for
common stock, par value US$.01 per share, of Loral Space & Communications Ltd.
(the



                                      -16-
<PAGE>   17


"Loral Common Stock"), based upon an appraisal of the fair market value of the
EE Social Parts in accordance with the provisions of Section 3(d).

     (f) Redemption of Social Parts. At the request of either Loral or EE (the
"Requesting Member"), the Company shall sell such number of shares of common
stock (the "SatMex Equivalent Shares") of SatMex held by the Company as shall
correspond to the indirect interest in SatMex represented by the Social Parts
proposed to the Transferred by the Requesting Member. The Company shall promptly
thereafter use the proceeds of such sale to redeem from the Requesting Member
the applicable number of Social Parts requested to be Transferred by the
Requesting Member. Notwithstanding the provisions of this Section 4(f), the sale
of the SatMex Equivalent Shares shall (A) be made in compliance with any
applicable restrictions under the Ley General de Sociedades Mercantiles, or any
other applicable law, and (B) remain subject to the provisions of Section 4(a)
through 4(c) as if they were Social Parts proposed to be Transferred by a
Member.

     (g) Sale of Member. A Member, substantially all of the assets of which
shall consist of Social Parts, shall not offer to sell its securities, or permit
its securities to be sold, to another party if such sale would result in a
Change of Control of such Member until and unless such Member shall have first
made a right of first offer with respect to such securities to the other Member
in the same manner as that set forth in Section 4(b) above.

5.   CERTAIN COVENANTS OF THE PARTIES

     (a) Expenses and Indemnification. Each of Loral and EE agrees to cause the
Company Entities to pay the fees and expenses incurred by the lenders under the
Commitment Letters, and to provide indemnification to the lenders as set forth
therein. In the event that the Company Entities shall be unable for whatever
reason, to provide such expense reimbursement or indemnification, then Loral and
EE, severally, agree to assume the obligations to pay such expenses or provide
such indemnity, as the case may be, in the following proportion: Loral 65% and
EE 35%.

     (b) The Members shall cause SatMex to: (i) enter into a management services
agreement with each of Loral and EE or their respective Affiliates substantially
in the form set forth as Exhibit A hereto (the "Management Services Agreement");
(ii) enter into a license agreement with Loral or its Affiliates substantially
in the form set forth as Exhibit B hereto (the "IP Agreement") and (iii) adopt a
marketing policy submitted by



                                      -17-
<PAGE>   18


Loral, which policy shall be consistent with the guidelines set forth in the
definitive prospectus relating to the exchange offer of SatMex's 10 1/8% Senior
Notes due 2004 and approved by EE (the "Marketing Policy"). The Members hereby
agree that they shall not amend, or cause SatMex to amend, any of the Management
Services Agreement, the IP Agreement or the Marketing Policy without the consent
of Loral and EE.

     (c) Tax Considerations. Each of Loral and EE agrees that, at the request of
either Member, it shall execute and deliver any documents necessary for the
Company or any Company Entity to be treated as a partnership to the extent
permitted for United States federal income tax purposes, provided that such
designation shall not adversely effect the other Member or any Company Entity.

     (d) Application of (Mexican) General Business Entities Act. Each of Loral,
EE and the Company covenants and agrees, and each party hereto acknowledges that
each other party hereto is entering into this Agreement in reliance on, the
following:

          (i) that any and all rights that the parties hereto may have under
     Articles 38 and 42 of the General Business Entities Act (or any successor
     provisions) are hereby expressly waived;

          (ii) that the events of rescission provided for in Article 50 of the
     General Business Entities Act (or any successor provisions) shall not be
     actionable by the parties hereto and shall not apply to the Company except
     as may be expressly provided for in this Agreement or in the by-laws of the
     Company; and

          (iii) any attempt by any party hereto to exercise or invoke any of the
     provisions of Articles 15, 38, 42 or 50 of the General Business Entities
     Act (or any successor provisions) other than as expressly provided for
     herein or in the by-laws of the Company shall be void and shall constitute
     a material breach of this Agreement by such party which will be actionable
     by any other party.

     The Company covenants and agrees that each certificate evidencing Social
Parts or other instrument issued by the Company which represents or evidences an
interest in Social Parts shall bear a legend to the foregoing effect.

     (e) Loral hereby agrees that, without the prior written consent of EE after
full disclosure of all material facts and



                                      -18-
<PAGE>   19


circumstances, it will not knowingly permit any Company Entity to take any
action or adopt any policy that would discriminate unfairly against any Company
Entity in favor of Loral or any of its other Affiliates in any material respect,
including, without limitation, marketing policies applicable to areas in which
any Company Entity competes with Loral or such Affiliate.

6.   WARRANTIES AND REPRESENTATIONS OF THE MEMBERS

     Each Member severally, represents to the other Member that:

          (a) Corporate Existence and Power. Such Member (a) is duly organized
     and validly existing under the laws of the jurisdiction of its organization
     and (b) has the corporate power and authority to execute, deliver and
     perform its obligations under this Agreement. Such Member is duly qualified
     to do business as a corporation in each jurisdiction in which the conduct
     of its business or the nature of the property owned by it requires such
     qualification except where the failure to so qualify would not have a
     material adverse effect on such Member.

          (b) Authorization. This Agreement constitutes the valid and binding
     obligation of such Member, enforceable against such Member in accordance
     with its terms, except to the extent that enforceability thereof may be
     limited by bankruptcy, insolvency, reorganization, moratorium, fraudulent
     transfer and other similar laws affecting creditors' rights and remedies
     generally from time to time in effect. The execution, delivery, and
     performance of this Agreement have been duly authorized by all necessary
     action on the part of such Member.

          (c) No Contravention. The execution, delivery and performance by such
     Member of this Agreement and the transactions contemplated hereby (a) do
     not contravene the terms of the charter, by-laws or other organizational
     documents of such Member, (b) do not violate, conflict with or result in
     any breach or contravention of, or the creation of any lien under, any
     indenture, mortgage, deed of trust, credit agreement or other agreement to
     which such Member is party or to which its properties may be bound and (c)
     do not violate any provisions of applicable law.

          (d) Governmental Authorization; Third Party Consents. No approval,
     consent, exemption, authorization or other action by, or notice to, or
     filing with, any governmental authority or any other Person in respect of
     any requirement of law or any requirement of contract or otherwise, and no
     lapse of a waiting



                                      -19-
<PAGE>   20


     period under any requirement of law, is necessary or required in connection
     with the execution, delivery or performance by such Member, or the
     enforcement against such Member, of this Agreement, or the transactions
     contemplated hereby.

          (e) Investment for Own Account. Such Member is acquiring the Social
     Parts purchased hereunder for its own account for investment and not with a
     view towards the resale, transfer or distribution thereof, nor with any
     present intention of distributing such Social Parts. Except as set forth in
     this Agreement, no other Person has any right with respect to or interest
     in the Social Parts to be purchased by such Member, nor has the Member
     agreed to give any Person any such interest or right in the future.

          (f) Offering Exemption. Such Member understands that the Social Parts
     being purchased by it hereunder have not been registered under the
     Securities Act, nor qualified under any state securities laws, and that
     they are being offered and sold pursuant to an exemption from such
     registration and qualification based in part upon the representations of
     the Members contained herein.

7.   INTERPRETATION OF THIS AGREEMENT

          (a) Terms Defined. As used in this Agreement, the following terms have
     the respective meaning set forth below:

               Acquisition: has the meaning set forth in the recitals hereto.

               Acquisition Sub: has the meaning set forth in the recitals
          hereto.

               Additional Capital Contribution: shall mean any additional equity
          contribution that may be required to be funded by Acquisition Sub as a
          condition precedent to the closing of the Credit Agreement or the
          Bridge Securities Purchase Agreement.

               Affiliate: means any Person or entity, directly or indirectly
          controlling, controlled by or under common control with such Person or
          entity.

               Bridge Note Commitment Letter: shall mean that certain commitment
          letter, dated as of November 17, 1997, by and between Loral Space &
          Communications Ltd. and Telefonica Autrey, S.A. de C.V., on the one
          hand, and DLJ Bridge Finance, Inc. and LB I



                                      -20-
<PAGE>   21


          Group Inc., on the other hand, with respect to the financing of
          certain bridge securities, in the amount of up to US$270 million.

               Bridge Securities Purchase Agreement: shall mean the definitive
          securities purchase agreement entered into in connection with the
          Bridge Note Commitment Letter.

               Business Plan: shall mean the business plan dated January 23,
          1998 agreed upon by Loral and EE in connection with the Acquisition.

               Change of Control: shall mean the acquisition of a majority of
          the voting stock or analogous equity interest of a Member by a party
          other than an Affiliate of such Member.

               Closing Date: shall have the meaning set forth in Section 1(c).

               Concession Agreements: The Agreements dated October 23, 1997
          entered into between SetMex and the Mexican Government relating to
          geostationary orbital positions located at 116.8(Degree)W,
          109.2(Degree)W and 113.0(Degree)W.

               Concession Subsidiary: shall mean a subsidiary of the Company
          formed for the purpose of applying for, and holding, a license from
          the Mexican Government to provide satellite transmission services
          directly to end-users.

               Consumer Price Index: shall mean the Bureau of Labor Statistics
          Consumer Price Index, Subgroup "Urban Consumers (Revised)" for the
          United States as published by the United States Department of Labor.

               Commitment Letters: shall mean collectively, the Bridge Note
          Commitment Letter and the Facility Commitment Letter.

               Company Entities: shall mean the Company, SatMex and their
          respective subsidiaries provided that if the Board of Directors of the
          Company shall determine by a Consensus Vote under Section 2(a)(i) that
          the board of directors of any subsidiary (other than SatMex) need not
          be identical to that of the Board of Directors of the Company, then
          such subsidiary shall not be deemed to be a Company Entity for
          purposes of Section 2 (a)-(d).

               Consensus Vote: shall have the meaning set forth in Section 2(c).



                                      -21-
<PAGE>   22


               Credit Agreement: shall mean the definitive credit agreement
          entered into in connection with the Facility Commitment Letter.

               Earlier Appraisals: shall have the meaning set forth in Section
          3(d).

               Extraordinary Matter: shall have the meaning set forth in Section
          2(d).

               Facility Commitment Letter: shall mean that certain commitment
          letter, dated as of November 17, 1997, by and between Loral Space &
          Communications Ltd. and Telefonica Autrey, S.A. de C.V., on the one
          hand, and DLJ Capital Funding, Inc., Lehman Commercial Paper Inc. and
          Donaldson Lufkin & Jenrette Securities Corporation on the other hand,
          with respect to the financing up to US$500 million of secured credit
          facilities.

               Financing Documents: shall mean collectively, the Bridge
          Securities Purchase Agreement and the Credit Agreement and all related
          documents.

               Fixed Rate Financing: shall mean the issuance of notes of a
          Company Entity to finance a portion of the purchase price of the
          SatMex acquisition or to refinance indebtedness, if any, outstanding
          in respect of the Bridge Note Commitment Letter.

               Government Obligation: The obligation incurred by SatMex Holdings
          to the federal government of the United Mexican States under that
          certain Agreement, dated as of December 1997.

               Interim Facility: shall mean that Demand Loan Agreement dated as
          of November 17, 1997, by and between Corporativo Satellites Mexicanos,
          S.A. de C.V., on the one hand, and DLJ Capital Funding, Inc., Lehman
          Commercial Paper Inc. and Donaldson Lufkin & Jenrette Securities
          Corporation, on the other hand, with respect to the financing up to
          US$57.5 million of interim credit facilities.

               Member, Members: shall have the meaning set forth in the
          introduction.

               Permitted Transactions: shall mean collectively, the following:
          (i) transactions contemplated under the Management Services Agreement,
          as amended from time to time in accordance with the terms hereof, (ii)
          transactions contemplated under the IP Agreement, as amended from time
          to time in accordance with the terms hereof, (iii) transactions
          contemplated under the Marketing



                                      -22-
<PAGE>   23


          Policy, as amended from time to time in accordance with the terms
          hereof, (iv) the guarantee by Loral Space & Communications Ltd. of the
          Interim Credit Facility, (v) transactions between and among the
          Company Entities and any of the Service Subsidiary or the Concession
          Subsidiary and (vi) transactions between and among the Company
          Entities.

               Permitted Transfer: a transfer (i) by either Loral or EE of
          Social Parts owned by it to any of its Affiliates, (ii) to the Company
          provided that in the case of clause (i), the transferee shall agree in
          writing to comply with all the provisions of this Agreement and
          provided further that no such transfer shall relieve the transferring
          Member from any liability of such transferring Member hereunder.

               Person: an individual, partnership, joint-stock company,
          corporation, trust or unincorporated organization, and a government or
          agency or political subdivision thereof.

               Proposal: shall have the meaning set forth in Section 3(a).

               Proposing Member: shall have the meaning set forth in Section
          3(a).

               Purchaser: shall have the meaning set forth in Section 4(b).

               Qualified Mexican Person: shall mean a Person that is either a
          Mexican national or is organized under the laws of Mexico and
          satisfies the requirements of the Federal Telecommunications Law and
          Foreign Investment Laws as then in effect.

               SatMex: Satelites Mexicanos, S.A. de C.V., a company organized
          under the laws of Mexico.

               SatMex Holdings: shall have the meaning set forth in the recitals
          hereto.

               SatMex Dividend Policy: The policy by SatMex to pay annual
          dividends in an amount equal to at least 20% of the total amount
          available for distribution (after payment of liabilities and
          establishment of appropriate reserves as determined by management) but
          only to the extent such dividends are permitted under the debt
          instruments to which the Company Entities are bound and only to the
          extent of the balance in SatMex's Cuenta de Fiscal Neta (CUFIN)
          account.



                                      -23-
<PAGE>   24


               SatMex Stock Purchase Agreement: The Stock Purchase Agreement
          between the Company and the Mexican government dated as of November
          17, 1997, with respect to the purchase of a 75% interest in SatMex.

               Securities Act: the United States Securities Act of 1933, as
          amended.

               Selling Member: shall have the meaning set forth in Section 4(c).

               Service Subsidiary: shall mean a subsidiary of the Company formed
          for the purpose of hiring and providing administrative, management,
          accounting, legal, operations, maintenance and other ancillary
          services to SatMex.

               Significant Decision: shall have the meaning set forth in Section
          2(e).

               Social Parts: shall have the meaning set forth in the Recitals.

               Stated Price: shall have the meaning set forth in Section 4(b).

               Subject Social Parts: shall have the meaning set forth in Section
          4(b).

               subsidiary: shall mean in respect of any Person any other Person
          which, at the time as of which any determination is being made, such
          Person or one or more of its subsidiaries has, directly or indirectly,
          Voting Control.

               Tag-Along Holder: shall have the meaning set forth in Section
          4(c).

               Transfer: any sale, assignment, pledge, hypothecation, or other
          disposition or encumbrance.

               Transferor: shall have the meaning set forth in Section 4(b).

               Voting Control: shall mean, at any time, (A) the ownership or
          control, whether direct or indirect, of outstanding Social Parts of
          capital stock of (or equity interests in) a Person, which Social Parts
          or interest at such time have by the terms thereof ordinary voting
          power to elect a majority of the members of the Board of Directors (or
          Persons performing similar functions) of such Person (excluding voting
          power of the holders



                                      -24-
<PAGE>   25


          of preferred stock arising upon the occurrence of a contingency) or
          (B) with respect to any partnership when (i) the sole general partner
          or the managing general partner of which is such Person or a
          subsidiary of such Person or (ii) the only general partners of which
          are such Person or of one or more subsidiaries of such Person (or any
          combination thereof).

     (b) Directly or Indirectly. Where any provision in this Agreement refers to
action to be taken by any Person, or which such Person is prohibited from
taking, such provision shall be applicable whether such action is taken directly
or indirectly by such Person.

     (c) Governing Law. This Agreement shall be governed by and construed in
accordance with the laws of Mexico applicable to contracts made and to be
performed entirely within such jurisdiction.

     (d) Section Headings. The headings of the sections and subsections of this
Agreement are inserted for convenience only and shall not be deemed to
constitute a part thereof.

     (e) Arbitration. In the event of any dispute, controversy or claim arising
out of or relating to this Agreement, or to the breach or termination hereof (a
"Dispute"), the parties agree to resolve the same as follows:

          (a) The parties to the Dispute shall initially attempt to resolve it
     through consultations and negotiations.

          (b) If the Dispute has not been resolved amicably within thirty (30)
     days after any party provides notice thereof, unless the parties agree
     otherwise, the Dispute shall be resolved by final and binding arbitration
     in New York, New York, if EE shall have initiated the proceeding or in
     Dallas, Texas, if Loral shall have initiated the proceeding, in each case
     in accordance with the Arbitration Rules of the United Nations Commission
     on International Trade Law ("UNCITRAL"), as in effect on the date of this
     Agreement. The language to be used in the arbitral proceeding shall be
     English. The International Chamber of Commerce shall serve as the
     appointing authority. The arbitrators shall render a written award stating
     the reasons for the decision. Judgment on an arbitral award or decision may
     be entered by any court of competent jurisdiction, or application may be
     made to such a court for judicial acceptance of the award or decision and
     any appropriate order, including enforcement (homologacion).



                                      -25-
<PAGE>   26


          (c) Each of the parties hereto consents to the submission of any
     Dispute for settlement by final and binding arbitration in accordance with
     paragraph (b) above. Such consent shall satisfy the requirements for:

               (i) A written arbitration agreement between the parties pursuant
          to Article I of the Inter-American Convention on International
          Commercial Arbitration (Convercion Interamericana Sobre Arbitaje
          Comercial Internacional), promulgated in Panama on January 30, 1975;

               (ii) An "agreement in writing" pursuant to Article II of the
          United Nations Convention on the Recognition and Enforcement of
          Foreign Arbitration Awards, done at New York on June 10, 1958; and

               (iii) A written arbitration agreement between the parties
          pursuant to Article 1423 of the Mexican Commercial Code (Codigo de
          Comercio).

          (d) The parties hereby agree to continue to perform their obligations
     hereunder while any Dispute is pending.

          (e) Each of the parties hereby undertakes to carry out without delay
     the provisions of any arbitral award or decision.

8.   CONFIDENTIALITY

     As to so much of the information and other material furnished under or in
connection with this Agreement (whether furnished before, on or after the date
hereof) as constitutes or contains confidential business, financial or other
information of any of the Company Entities, each Member covenants for itself and
its directors, officers and partners that it will use due care to prevent its
officers, directors, partners, employees, counsel, accountants and other
representatives from disclosing such information to Persons other than their
respective authorized employees, counsel, accountants, Members, partners,
limited partners and other authorized representatives; provided, however, that a
Member may disclose or deliver any information or other material disclosed to or
received by it should the Member be advised by its counsel that such disclosure
or delivery is required by law, regulation or judicial or administrative order.
For purposes of this Section 9, "due care" means at least the same level of care
that a Member would use to protect the



                                      -26-
<PAGE>   27


confidentiality of its own sensitive or proprietary information, and this
obligation shall survive termination of this Agreement.

9.   MISCELLANEOUS

     (a)  Notices.

     (i) All communications under this Agreement shall be in writing and shall
be delivered by hand or mailed by overnight courier or by facsimile:

          (A) if to Loral, at Loral SpaceCom Corporation, 600 Third Avenue, New
     York, New York 10016, marked for the attention of Eric J. Zahler, Vice
     President, General Counsel and Secretary, or at such other address as Loral
     may have furnished the Company in writing (with a copy to Willkie Farr &
     Gallagher, One Citicorp Center, 153 East 53rd Street, New York, New York
     10022 for the attention of Bruce R. Kraus, Esq. and Sanchez Mejorada
     Velasco y Valencia, Paseo de la Reforma 450, Lomas de Chapultepec, 11000
     Mexico, D.F. to the attention of Carlos R. Valencia Barrera, Esq.);

          (B) if to EE, at Sierra Santa Rosa No. 61, Lomas de Chapultepec,
     Mexico, D.F. 11650, marked for the attention of Lauro Gonzalez, or at such
     other address as EE may have furnished the Company in writing (with a copy
     to Vinson & Elkins L.L.P., 3700 Trammel Crow Center, Dallas, Texas 75201
     for the attention of Tim Foarde); and

          (C) if to the Company, at Eje Central Lagard Cardenas 567 Piso 12, Ala
     Norte Col. Narvarte, C.P. 03020, Mexico D.F. marked for attention of
     General Counsel, or at such other address as it may have furnished in
     writing to each of the Members.

     (ii) Any notice so addressed shall be deemed to be given: if delivered by
hand, on the date of such delivery; if mailed by courier, on the third business
day following the date of such mailing; and if sent by facsimile, on the next
business day after receipt of confirmation.

     (b) Reproduction of Documents. This Agreement and all documents relating
thereto, including, without limitation, (i) consents, waivers and modifications
which may hereafter be executed, (ii) documents received by each Member pursuant
hereto and (iii) financial statements, certificates and other



                                      -27-
<PAGE>   28


information previously or hereafter furnished to each Member, may be reproduced
by each Member by a photographic, photostatic, microfilm, microcard, miniature
photographic or other similar process and each Member may destroy any original
document so reproduced. All parties hereto agree and stipulate that any such
reproduction shall be admissible in evidence as the original itself in any
judicial or administrative proceeding (whether or not the original is in
existence and whether or not such reproduction was made by each Member in the
regular course of business) and that any enlargement, facsimile or further
reproduction of such reproduction shall likewise be admissible in evidence.

     (c) Injunctive Relief. The Company and the Members hereby declare that it
is impossible to measure in money the damages which will accrue to the parties
hereto by reason of the failure of any party to perform any of its obligations
set forth in this Agreement. Therefore, the Company and the Members agree that
in the event of a breach or threatened breach by any other party of the
provisions of this Agreement, in addition to any remedies at law, they shall,
respectively, without posting any bond, be entitled to obtain equitable relief
in the form of specific performance, a temporary restraining order, a temporary
or permanent injunction or any other equitable remedy which may then be
available, and if any party hereto shall institute any action or proceeding to
enforce the provisions hereof, each of the Company and the Members hereby waives
the claim or defense that the party instituting such action or proceeding has an
adequate remedy at law.

     (d) Successors and Assigns. This Agreement shall inure to the benefit of
and be binding upon the successors and assigns of each of the parties.

     (e) Entire Agreement; Amendment and Waiver. This Agreement constitutes the
entire understanding of the parties hereto relating to the subject matter hereof
and supersedes all prior understandings among such parties, between any of them
and the Company or among any of them. This Agreement may be amended, and the
observance of any term of this Agreement may be waived, with (and only with) the
written consent of the Company, Loral and EE.

     (f) Severability. In the event that any part or parts of this Agreement
shall be held illegal or unenforceable by any court or administrative body of
competent jurisdiction, such determination shall not effect the remaining
provisions of this Agreement which shall remain in full force and effect.



                                      -28-
<PAGE>   29


     (g) Counterparts. This Agreement may be executed in one or more
counterparts, each of which shall be deemed an original and all of which
together shall be considered one and the same agreement.

     (h) Non-Contravention. Each of the parties hereto agrees that it shall not
take any action that would result in a violation of the Federal
Telecommunications law (by Federal Telecommunicaciones) or the Concession
Agreements.

     (i) Further Actions. Each of the parties hereto agrees that it shall amend,
or cause to amend, the by-laws of the Company Entities in such manner as may be
reasonably requested by either Loral or EE so as to effectuate the provisions of
this Agreement.



                                      -29-
<PAGE>   30


     IN WITNESS WHEREOF, the parties hereto have executed this Membership
Agreement as of the date first above written.



                  EDICIONES ENIGMA, S.A. DE C.V.



                  By:/s/ Lauro A. Gonzalez Moreno
                     -------------------------------------
                  Name: Lauro A. Gonzalez Moreno
                  Title:



                  LORAL SATMEX LTD.



                  By:/s/ Eric J. Zahler
                     -------------------------------------
                  Name: Eric J. Zahler
                  Title:



                  FIRMAMENTO MEXICANO, S. de R.L. de C.V.



                  By:/s/ Lauro A. Gonzalez Moreno
                     -------------------------------------
                  Name: Lauro A. Gonzalez Moreno
                  Title:



                  By:/s/ Eric J. Zahler
                     -------------------------------------
                  Name: Eric J. Zahler
                  Title:



                                      -30-
<PAGE>   31


                                   SCHEDULE I

                               Board of Directors


                 Board of Directors of the Company and SatMex(1)

       Designating Member                          Director
       ------------------                          --------
       EE                                          Sergio Autrey Maza,
                                                   Chairman of the Board(2)

       Loral                                       Bernard L. Schwartz(2)

       Loral                                       Eric J. Zahler (3)

       EE                                          Lauro Gonzalez Moreno(3)

       EE                                          Xavier Autrey Maza

     In addition, Eric J. Zahler shall serve as Secretary to the Board of the
Company and SatMex.

----------
(1)  In addition to the persons set forth on this Schedule I, the Mexican
     Government shall have the right to appoint one additional director to
     SatMex.

(2)  Member of the Executive Committee.

(3)  Executive Committee Alternate.


                                      -31-
<PAGE>   32


                                   SCHEDULE II

                        Executive Officers of the Company


President                                                 Sergio Autrey Maza
Chief Executive Officer                                   Bernard L. Schwartz
Chief Operating Officer                                   Gregory J. Clark
Chief Financial Officer                                   Lauro Gonzalez Moreno


                          Executive Officers of SatMex



Chief Executive Officer                                   Lauro Gonzalez Moreno
Chief Operating Officer                                   Joseph Del Riego
Chief Financial Officer                                   Cynthia Pelini
Chief Accounting Officer                                  Jorge Lopez Aguado