Document:

<PAGE>   1
                                                                    EXHIBIT 10.4

                     AMERICAN MULTIPLEXER(TM) CORPORATION,
                       RESTRICTED STOCK WARRANT AGREEMENT

      American Multiplexer(TM) Corporation, a California corporation (the
"Company"), has granted to Douglas R. Hanson (the "Warrantee"), a warrant (the
"Warrant") to purchase a total of One Million (1,000,000) shares of Common
Stock (the "Shares") of the Company on the terms and conditions set forth below.

1.    Nature of the Warrant: This Warrant is intended to qualify according to
      SEC rules.

2.    Exercise Price: The exercise price will be $1.00 per share.

3.    Right to Exercise Warrant: The Warrant is granted by the Company based on
      the intent of the Parties to the Warrant for the company to enter into a
      new business and to accomplish certain goals and objectives some of which
      are identified in the Descriptive Memorandum (c)1998. Warrantee shall
      accumulate the right to exercise the shares of the Warrant based on a) the
      Company's stock increasing in price over time, and/or b) the Company's
      achievement of certain milestones as identified herein. Said rights may be
      exercised independently based on the following set of conditions:

            (a)   Stock Price. The right to exercise up to 50% of the warrant
      (500,000 shares) is based on the following stock price milestones (with a
      base of 20 million shares in the company), whereby the stock maintains an
      average price on the OTC BB or other market for a period of 30 days:

            Stock Price @ $1.00 per share - 100,000 shares exercisable
            Stock Price @ $3.00 per share - 100,000 shares exercisable
            Stock Price @ $5.00 per share - 100,000 shares exercisable
            Stock Price @ $10.00 per share - 100,000 shares exercisable
            Stock Price @ $20.00 per share - 100,000 shares exercisable

            The above stock prices will be adjusted downward proportionally if
      the base of 20 million shares increases in the future.

            (b)   Marketing and Technical Milestones. The right to exercise up
      to 50% of the warrant (500,000 shares) is based on the Company achieving
      the following marketing, sales and engineering milestones. The achievement
      of the milestones is subject to the availability of funding to support the
      development and sales efforts as specified herein., and is based on time
      following the expenditure of said funds. If the funding is delayed, the
      technical or marketing milestone date is also delayed, but such change in
      milestone date does not cancel or void the Warrant.

<TABLE>
<CAPTION>
---------------------------------------------------------------------------------------------
Milestone                                   Months         Cumulative Eng.    Shares
                                            From           Funding            Exercisable
                                            Funding        Amount
---------------------------------------------------------------------------------------------
<S>                                         <C>           <C>                 <C>
1. DigiCop-1 Redesign                                      $ 1,217,000          50,000
---------------------------------------------------------------------------------------------
2. DVB Compliant System Integration                        $ 2,051,540          50,000
---------------------------------------------------------------------------------------------
3. Ku Band Radio Production                                $ 3,279,653          75,000
---------------------------------------------------------------------------------------------
4. Availability of DVB Services                            $ 4,496,706          75,000
---------------------------------------------------------------------------------------------
6. Beta Test SatExpress                                    $ 9,713,278         100,000
---------------------------------------------------------------------------------------------
7. Hub Production                                          $11,267,098          75,000
---------------------------------------------------------------------------------------------
8. SatExpress Production                                   $14,785,718          75,000
---------------------------------------------------------------------------------------------

</TABLE>

            (c)   This Warrant may not be exercised for a fraction of a share.
      The right to exercise to purchase the individual share as described above
      will expire 3 years after it becomes exercisable.

1998-99 American Multiplexer(TM) Corp. Confidential-Stock Option Agreement
                                                                     Page 1 of 4
<PAGE>   2
4.   Rights of Survivorship. In the event of the warrantee's death, disability
     or other termination of employment, other than cause, the rights to
     exercise the warrants will be transferable to the warrantee's beneficiary
     or other designatee defined by the warrantee.

5.   Merger, Consolidation or Sale of Assets. In the event of a proposed sale of
     all or substantially all of the assets of the Company, or the merger of the
     Company with or into another corporation, the Company shall provide
     Warrantee with written notice of such transaction not later than thirty
     (30) days prior to the projected date of such transaction. Notwithstanding
     the vesting provisions of Section 3(a)(b) above, after delivery of such
     notice Warrantee may exercise this Warrant to the full extent. After
     delivery of such notice, the warrantee can, upon providing notice,
     accelerate vesting at 100% of the full value of the warrant on or prior to
     the date of such transaction and may condition his exercise upon the
     occurrence of the transaction. Whether or not so exercised, this Warrant
     agreement shall terminate immediately upon the consummation of such
     proposed sale, merger or offering.

6.   Method of Exercise of Warrants. This Warrant shall be exercisable by
     written notice which shall state the election to exercise the Warrant, the
     number of Shares in respect of which the Warrant is being exercised, and
     such other representations. Such written notice shall be signed by the
     Warrantee and shall be delivered in person or by certified mail to the
     Secretary of the Company or designee. The written notice shall be deemed to
     be exercised upon receipt by the Company of such written notice accompanied
     by the exercise price at the fair market value at the time of exercise.
     Exhibit A contains the form that should be used. No shares will be issued
     pursuant to the exercise of an Warrant unless such issuance and such
     exercise shall comply with all relevant provisions of law and the
     requirements of any stock exchange upon which the Shares may then be
     listed. Assuming such compliance, for income tax purposes the Shares shall
     be considered transferred to the Warrantee on the date on which the Warrant
     is exercised with respect to such Shares.

7.   Method of Payment. Payment of the exercise price shall be by cash, check,
     or delivery of Common Stock of the Company that has been vested by the
     Warrantee. The value of such common stock shall have a fair market value at
     least equal to the exercise price payable with respect to the exercise
     hereof or any combination of such methods of payment.

8.   Termination of Status as an Employee.

          a)   Termination without Cause: In the event of termination without
     cause of the warrantee's status as an employee, the full value of this
     warrant will be exercisable.

          b)   Termination with Cause. In the event of termination with cause of
     Warrantee's status as an employee, he may, but only within one
     hundred-eighty (180) days after date of such termination, exercise this
     warrant to the extent that he was entitled to exercise it at the date of
     such termination. To the extent that he was not entitled to exercise this
     warrant at the date of such termination, or if he does not exercise this
     Warrant within the time specified herein, the Warrant shall terminate.

9.   Disability of Warrantee. Notwithstanding the provisions of Section 8 above,
     in the event of termination of Warrantee's status as an employee as a
     result of disability, he may, but only within six months from the date of
     termination of employment, exercise his Warrant to the extent he was
     entitled to exercise it at the date of such termination. To the extent that
     he was not entitled to exercise the Warrant at the date of termination, or
     if he does not exercise such Warrant within the time specified herein, the
     Warrant shall terminate.

10.  Death of Warrantee. In the event of the death of Warrantee, the Warrant may
     be exercised, at any time within six months following the date of death, by
     Warrantee's estate, spouse or by a person who acquired the right to
     exercise the Warrant by bequest or inheritance but only to the extent of
     the right

1998-99 American Multiplexer(TM) Corp. Confidential-Stock Warrant Agreement
                                                                     Page 2 of 4
<PAGE>   3
     to exercise that has accrued at the date of death of the Warrantee. To the
     extent that Warrantee was not entitled to exercise the Warrant at the date
     of his death, or if the Warrantee's estate or legatee does not exercise the
     Warrant within the time specified herein, the Warrant shall terminate.

11.  Transferability of Warrant. This Warrant may not be transferred in any
     manner otherwise than by will or by the laws of descent or distribution and
     may be exercised during the lifetime of Warrantee only by him. The terms of
     this Warrant shall be binding upon the executors, administrators, heirs,
     successors and assigns of the Warrantee.

12.  Term of Warrant. This Warrant may not be exercised more than ten (10) years
     from the date of grant of this Warrant, and may be exercised during such
     term only in accordance with the Plan and the terms of this Warrant.

13.  Early Disposition of Stock. Warrantee understands that if he disposes of
     any Shares received under this Warrant within two years after the date of
     this Agreement or within one year after such Shares were transferred to
     him, he will be treated for federal income tax purposes as having received
     ordinary income at the time of such disposition in an amount generally
     measured by the difference between the price paid for the Shares and the
     lower of the fair market value of the Shares at the date of the exercise or
     the fair market value of the Shares at the date of disposition. Warrantee
     understands that if he disposes of such Shares at any time after the
     expiration of such two-year and one-year holding periods, any gain on such
     sale will be taxed as long-term capital gain.

Date of grant: November 1, 1998

AMERICAN MULTIPLEXER CORPORATION,
a California corporation

By: /s/ EDWARD TAN
    ----------------------------
    Edward Tan, President/CEO

1998-99 American Multiplexer(TM) Corp. Confidential-Stock Warrant Agreement
                                                                     Page 3 of 4<PAGE>   1
[SATMEX LOGO]                                                       EXHIBIT 10.5

                               INTERIM AGREEMENT

The purpose of this Interim Agreement, dated September 1st, 1999, is to set the
terms and conditions of a temporary signal conduction via satellite service,
which shall enter into "Contract number 266-I for Rendering of the International
Service of Signal Conduction via Satellite through the Mexican Satellite System
("Sistema de Satelites Mexicanos"), entered into by and between American
Multiplexer ("AM") and Satelites Mexicanos S.A. de C.V. ("SATMEX").

"AMC" AND "SATMEX" hereby undertake to execute "Contract number 266-I for
Rendering of the International Service of Signal Conduction via Satellite
through the Mexican Satellite System ("Sistema de Satelites Mexicanos")
(hereinafter the "Contract"), for services beginning September 1st, 1999, within
thirty (30) days under the following conditions:

1.   The parties agree to subscribe the Contract for 72 MHz capacity, on "Ku1"
     band, on SATMEX 5 satellite, according to the schedule stipulated in point
     3 below, with the understanding that the other technical, commercial and
     legal specifications shall be stipulated in the Contract. Said Contract
     will be signed no later than 30 calendar days from the date of signing of
     this Interim Agreement, and will be based on mutually agreed terms and
     conditions. If mutual agreement on the terms and conditions are not
     reached within thirty days, contract will become null and void.

2.   The term of the contract shall be five (5) years, counted from January
     1st, 2000 (date on which the second transponder shall be taken).

3.   "AMC" shall pay "SATMEX" for the service subject matter of the Contract,
     the total amount of USD$19,059,600.00 (nineteen million fifty-nine
     thousand six hundred 00/100 U.S. Dollars), according to the following
     monthly payment schedule:

<TABLE>
<CAPTION>
===========================================================================================
                          BANDWIDTH (MHz)               EIRP      $US/MONTH      $US/MHz
-------------------------------------------------------------------------------------------
<S>                      <C>                           <C>       <C>            <C>
 From September 1st       1st transponder (36 MHz)      Nominal   $155,400.00    $4,316.66
   1999, to December
   31st, 1999
-------------------------------------------------------------------------------------------
 From January 1st,        1st and 2nd transponders      Nominal   $307,300.00    $4,268.05
   2000, to December        (72 MHz)
   31st, 2005
===========================================================================================
</TABLE>

     The above committed transponders will be reserved for "AMC" on the same
     polarization.

     During October and November, 1999, "AMC" will have one 24 MHz carrier in a
     "Ku1" transponder and one 12 MHz carrier (Beta) in another "Ku1"
     transponder. Both carriers must use their nominal EIRP.

4.   "AMC" shall guarantee "SATMEX" fulfillment of its obligations for an
     amount of USD$310,800.00, equivalent to two (2) monthly payments for the
     first transponder.

     This guarantee can be provided in the form of a cash deposit or
     irrevocable standby Letter of Credit. In case of a standby Letter of
     Credit, it must be issued by or confirmed by Citibank, New York.

                                                            --------------------
                                                              CLIENT'S INITIALS
                                                            --------------------
<PAGE>   2
[SATMEX LOGO]

     The guarantee shall be due and payable to "SATMEX" upon the signing of the
     formal Contract and valid through March 31st, 2005.

5.   "AMC" must pay for service on or before the 15th day of each month for
     which service is rendered, and by wire transfer to SATMEX bank account as
     follows:

     Beneficiary: Satelites Mexicanos, S.A. de C.V.
     Citibank N.A., 111 Wall Street, 21st floor, 10043, New York
     Account No.: 36184091
     ABA No.: 021000089

6.   "SATMEX" will extend validity of the proposal dated August 25th, 1999, for
     a third, fourth and fifth additional transponder until November 15th,
     1999. During this period, "SATMEX" will not reserve this capacity. The
     capacity is subject to availability.

     PROPOSAL: RAMP-UP SCHEDULE:

          Transponder 3 Start 6/1/00:   US$148,400
          Transponder 4 Start 9/1/00:   US$145,040
          Transponder 5 Start 12/1/00:  US$141,600

     PROPOSAL GENERAL TERMS AND CONDITIONS:

     A) It is required 60 days advance written notice confirming the start of
        transponders 3, 4 and 5.
     B) If transponders 3, 4 and 5 are not taken until such date, then a
        penalty equal to five months per transponder will apply.
     C) "AMC" must take all five transponders no longer than 12/31/00.

7.   "AMC" will integrate space segment capacity into telecom solutions for
     third parties within the international markets.

8.   "AMC" may cancel the Contract or a part thereof, notifying this to
     "SATMEX", in writing, at least thirty (30) working days in advance. In
     such case, the cancellation or termination date shall be referred to a
     calendar month (last day of the month).

     In case it is "AMC" that cancels part of the capacity Contracted or
     terminates this Interim Agreement before the end of the term in force
     indicated in point 3 above, the latter shall pay to "SATMEX", in one single
     payment and before the date notified by "AMC" has elapsed, the amount
     resulting from the tariff corresponding on a monthly basis to Contracts at
     one (1) year, for each month remaining to conclude the time period
     originally agreed upon, not to exceed twelve (12) months.

     In the assumption of partial cancellation, the aforementioned payment
     shall be applied to the capacity affected.

<PAGE>   3
[LOGO OF SATMEX]

    Advance cancellation or termination of a service does not release "AMC" from
    previous indebtedness or moratory interest.

    "SATMEX" reserves the right to assign the satellite capacity released due to
    advance cancellation or termination to another interested party, as of the
    day following the termination or cancellation date.

9.  The legal documentation required for the signature of the Contact is as
    follows:

    -  Article of Incorporation, duly notarized and with an Apostille seal.
    -  Power of attorney that stipulates the legal representative with powers
       to sign the Contract, duly notarized and with an Apostille seal.

This Interim Agreement is signed in counterparts, each remaining in possession
of each party, in Mexico City, as of 9/1/99.

                "SATMEX"                       "AMC"

                                          /s/ Edward Tan

         MR. JOSEPH DEL RIEGO             Edward Tan
         CHIEF OPERATING OFFICER          CEO

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