Document:

<PAGE>

                                                                    Exhibit 4.64

THIS NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED
(THE "SECURITIES ACT"), OR ANY STATE SECURITIES LAW AND MAY NOT BE SOLD,
TRANSFERRED OR OTHERWISE DISPOSED OF UNLESS REGISTERED UNDER THE SECURITIES ACT
AND UNDER APPLICABLE STATE SECURITIES LAWS OR SPEEDCOM WIRELESS CORPORATION
SHALL HAVE RECEIVED AN OPINION OF ITS COUNSEL THAT REGISTRATION OF SUCH
SECURITIES UNDER THE SECURITIES ACT AND UNDER THE PROVISIONS OF APPLICABLE STATE
SECURITIES LAWS IS NOT REQUIRED.

                          SPEEDCOM WIRELESS CORPORATION

                             SECURED PROMISSORY NOTE

U.S. $100,000.00                                              New York, New York
                                                                  April 14, 2003

     FOR VALUE RECEIVED, the undersigned, Speedcom Wireless Corporation, a
Delaware corporation (the "Borrower"), hereby promises to pay to the order of
SDS MERCHANT FUND, L.P. or any future permitted holder of this promissory note
(the "Lender"), at the principal office of the Lender set forth herein, or at
such other place as the holder may designate in writing to the Borrower, the
principal sum of up to ONE HUNDRED THOUSAND DOLLARS (U.S. $100,000.00), or such
other amount as may be outstanding hereunder, together with all accrued but
unpaid interest, in such coin or currency of the United States of America as at
the time shall be legal tender for the payment of public and private debts and
in immediately available funds, as provided in this promissory note (the
"Note"). This Note is the Note referred to in the Letter Loan Agreement dated
April 14, 2003 between the Borrower and the Lender (the "Letter Loan
Agreement").

          1. Principal and Interest Payments.

               (a) The Borrower shall repay in full the entire principal balance
then outstanding under this Note on the earlier (the "Maturity Date") of: (i)
December 31, 2003, or (ii) the acceleration of the obligations as contemplated
by this Note. The Maturity Date may be extended as agreed upon in writing
between the parties.

               (b) Interest on the outstanding principal balance of this Note
shall accrue at a rate of fifteen percent (15%) per annum. Interest on the
outstanding principal balance of the Note shall be computed on the basis of the
actual number of days elapsed and a year of three hundred and sixty (360) days
and shall be payable by the Borrower and shall be payable by the Borrower in
cash in full on the Maturity Date. Furthermore, upon the occurrence of an Event
of Default, then to the extent permitted by law, the Borrower will pay interest
to the Lender,

<PAGE>

payable on demand, on the outstanding principal balance of the Note from the
date of the Event of Default until payment in full at the rate of twenty percent
(20%) per annum.

          2. Security Agreement. The obligations of the Borrower hereunder shall
be secured by, and the Lender shall be entitled to the rights and security
granted by the Borrower pursuant to, the Security Agreement dated as of April
14, 2003 by the Borrower for the benefit of the Lender.

          3. Payment on Non-Business Days. Whenever any payment to be made shall
be due on a Saturday, Sunday or a public holiday under the laws of the State of
New York, such payment may be due on the next succeeding business day and such
next succeeding day shall be included in the calculation of the amount of
accrued interest payable on such date.

          4. Borrower's Prepayment Option. The Borrower may prepay, at the
option of its Board of Directors, all or any portion of the outstanding
principal amount of this Note and the accrued and unpaid interest thereon upon
five (5) business days prior written notice to the Lender (the "Borrower
Prepayment Notice") at a cash price equal to 150% of the sum of the outstanding
principal amount and any interest accrued and outstanding (the "Borrower
Prepayment Price"). The Borrower may not deliver a Borrower Prepayment Notice to
the Lender unless the Borrower has clear and good funds for a minimum of the
amount it intends to prepay in a bank account controlled by the Borrower. The
Borrower Prepayment Notice shall state the date of prepayment (the "Borrower
Prepayment Date"), the Borrower Prepayment Price, the amount of the Note of such
Lender to be prepaid, the amount of accrued and unpaid interest through the
Borrower Prepayment Date and shall call upon the Lender to surrender to the
Borrower on the Borrower Prepayment Date at the place designated in the Borrower
Prepayment Notice such Lender's Note. The Borrower Prepayment Date shall be no
more than five (5) trading days after the date on which the Lender is notified
of the Borrower's intent to prepay the Note (the "Borrower Prepayment Notice
Date"). If the Borrower fails to pay the Borrower Prepayment Price by the sixth
(6th) trading day following the Borrower Prepayment Notice Date, the prepayment
will be declared null and void and the Borrower shall lose its right to deliver
a Borrower Prepayment Notice to the Lender in the future. On or after the
Borrower Prepayment Date, the Lender shall surrender the Notes called for
prepayment to the Borrower at the place designated in the Borrower Prepayment
Notice and shall thereupon be entitled to receive payment of the Borrower
Prepayment Price.

          5. Replacement. Upon receipt of a duly executed, notarized and
unsecured written statement from the Lender with respect to the loss, theft or
destruction of this Note (or any replacement hereof), and without requiring an
indemnity bond or other security, or, in the case of a mutilation of this Note,
upon surrender and cancellation of such Note, the Borrower shall issue a new
Note, of like tenor and amount, in lieu of such lost, stolen, destroyed or
mutilated Note.

          6. Parties in Interest, Transferability. This Note shall be binding
upon the Borrower and its successors and assigns and the terms hereof shall
inure to the benefit of the Lender and its successors and permitted assigns.
This Note may be transferred or sold, subject to

                                       2

<PAGE>

the provisions of Section 8 of this Note, or pledged, hypothecated or otherwise
granted as Security by the Lender.

          7. Remedies, Characterizations, Other Obligations, Breaches and
Injunctive Relief. Upon an Event of Default (as defined in the Letter Loan
Agreement), the Lender shall have all the rights and remedies contained in the
Letter Loan Agreement. The remedies provided in this Note shall be cumulative
and in addition to all other remedies available under this Note or in the Letter
Loan Agreement, at law or in equity (including, without limitation, a decree of
specific performance and/or other injunctive relief), and no remedy contained
herein shall be deemed a waiver of compliance with the provisions giving rise to
such remedy and nothing herein shall limit a Lender's right to pursue actual
damages for any failure by the Borrower to comply with the terms of this Note.
Amounts set forth or provided for herein with respect to payments and the like
(and the computation thereof) shall be the amounts to be received by the Lender
and shall not, except as expressly provided herein, be subject to any other
obligation of the Borrower (or the performance thereof). The Borrower
acknowledges that a breach by it of its obligations hereunder will cause
irreparable and material harm to the Lender and that the remedy at law for any
such breach may be inadequate. Therefore the Borrower agrees that, in the event
of any such breach or threatened breach, the Lender shall be entitled, in
addition to all other available rights and remedies, at law or in equity, to
seek and obtain such equitable relief, including but not limited to an
injunction restraining any such breach or threatened breach, without the
necessity of showing economic loss and without any bond or other security being
required.

          8. Compliance with Securities Laws. The Lender of this Note
acknowledges that this Note is being acquired solely for the Lender's own
account and not as a nominee for any other party, and for investment, and that
the Lender shall not offer, sell or otherwise dispose of this Note other than in
compliance with the laws of the United States of America and as guided by the
rules of the Securities and Exchange Commission. This Note and any Note issued
in substitution or replacement therefore shall be stamped or imprinted with a
legend in substantially the following form:

          "THIS NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT
          OF 1933, AS AMENDED (THE "SECURITIES ACT"), OR ANY STATE
          SECURITIES LAW AND MAY NOT BE SOLD, TRANSFERRED OR OTHERWISE
          DISPOSED OF UNLESS REGISTERED UNDER THE SECURITIES ACT AND
          UNDER APPLICABLE STATE SECURITIES LAWS OR SPEEDCOM WIRELESS
          CORPORATION SHALL HAVE RECEIVED AN OPINION OF ITS COUNSEL
          THAT REGISTRATION OF SUCH SECURITIES UNDER THE SECURITIES
          ACT AND UNDER THE PROVISIONS OF APPLICABLE STATE SECURITIES
          LAWS IS NOT REQUIRED."

          9. Borrower Waivers. Except as otherwise specifically provided herein,
the Borrower and all others that may become liable for all or any part of the
obligations evidenced by this Note, hereby waive presentment, demand, notice of
nonpayment, protest and all other

                                       3

<PAGE>

demands and notices in connection with the delivery, acceptance, performance and
enforcement of this Note, and do hereby consent to any number of renewals of
extensions of the time or payment hereof and agree that any such renewals or
extensions may be made without notice to any such persons and without affecting
their liability herein and do further consent to the release of any person
liable hereon, all without affecting the liability of the other persons, firms
or Borrower liable for the payment of this Note, AND DO HEREBY WAIVE TRIAL BY
JURY.

               (a) No delay or omission on the part of the Lender in exercising
its rights under this Note, or course of conduct relating hereto, shall operate
as a waiver of such rights or any other right of the Lender, nor shall any
waiver by the Lender of any such right or rights on any one occasion be deemed a
waiver of the same right or rights on any future occasion.

               (b) THE BORROWER ACKNOWLEDGES THAT THE TRANSACTION OF WHICH THIS
NOTE IS A PART IS A COMMERCIAL TRANSACTION, AND TO THE EXTENT ALLOWED BY
APPLICABLE LAW, HEREBY WAIVES ITS RIGHT TO NOTICE AND HEARING WITH RESPECT TO
ANY PREJUDGMENT REMEDY WHICH THE LENDER OR ITS SUCCESSORS OR ASSIGNS MAY DESIRE
TO USE.

          10. Governing Law. This Agreement shall be governed by and construed
in accordance with the laws of the State of New York without giving effect to
the choice of law provisions. This Agreement shall not be interpreted or
construed with any presumption against the party causing this Note to be
drafted.

          11. Notices. Any notice, request, demand or other communication
permitted or required to be given hereunder shall be provided in the manner
specified in the Letter Loan Agreement.

                                       4

<PAGE>

          IN WITNESS WHEREOF, the Borrower has executed and delivered this Note
as of the date first written above.

                                            SPEEDCOM WIRELESS CORPORATION

                                            By:
                                                --------------------------------
                                                Name:
                                                Title:

                                       5<PAGE>

                                                                    Exhibit 4.65

April 29, 2003

Speedcom Wireless Corporation
7020 Professional Parkway East
Sarasota, Florida 34240

     RE:  Letter Loan Agreement

Ladies and Gentlemen:

     1. Loan. This letter when fully executed will constitute a loan agreement
(the "Agreement") among North Sound Legacy Institutional Fund LLC and North
Sound Legacy International Ltd. (collectively, the "Lenders"), and Speedcom
Wireless Corporation, a Delaware corporation (the "Borrower"), pursuant to which
the Lenders, on the terms and conditions provided herein, shall agree to make
one or more loans to or for the benefit of the Borrower hereunder (each a "Loan"
and collectively, the "Loans"), provided the aggregate principal amount of all
Loans shall not exceed One Hundred Fifty Thousand Dollars ($150,000.00). The day
on which the Lenders make a Loan is referred to herein as a "Closing Date." Each
Lender's obligation to make a Loan is subject to the Borrower's fulfillment of
each of the applicable conditions set forth in Section 4 hereof.

     2. Loan Documents.

          a. Notes. The Loans shall be evidenced by separate promissory notes
issued to the Lenders in the principal amount of each such Loan in the form
attached hereto as Exhibit A (together with any replacements and substitutes
therefor, the "Notes"). The principal amount of the Loans and interest thereon,
calculated at the rate of 15% per annum as provided in the Notes, shall be
payable as set forth more particularly therein.

          b. Security Agreement. The Loans shall be secured by a continuing
security interest in all of the property and assets of the Borrower pursuant to
the terms of a security agreement in the form attached hereto as Exhibit B (the
"Security Agreement").

          c. This Agreement, the Notes, the Security Agreement and each other
document which evidences and/or secures the Loans are hereinafter collectively
referred to as the "Loan Documents."

     3. Term and Termination. Subject to Section 6 hereof, the aggregate
principal amount of the outstanding Note and all accrued and unpaid interest
thereon and other sums owing hereunder and thereunder shall be due and payable
on the earlier (the "Maturity Date") of: (i) December 31, 2003, or (ii) the
acceleration of the obligations as contemplated by this Agreement. The Maturity
Date may be extended as agreed upon in writing between the parties.

     4. Conditions Precedent.

          a. Documents to be Delivered. The obligation of each Lender to make
any Loan is subject to the due execution and delivery by the Borrower (or the
Borrower causing the

<PAGE>

due execution and delivery) to each Lender of each of the following (all
documents to be in form and substance satisfactory to each Lender and their
counsel):

               i. This Agreement, the Notes, the Security Agreement and each
other instrument, agreement and document to be executed and/or delivered
pursuant to this Agreement and/or the instruments, agreements and documents
referred to in this Agreement.

               ii. A certified copy of the resolutions of the Board of Directors
(or if the Board of Directors takes action by unanimous written consent, a copy
of such unanimous written consent containing all of the signatures of the
members of the Board of Directors) of the Borrower, dated as of the initial
Closing Date, authorizing the execution, delivery and performance of the Loan
Documents.

               iii. A certificate, dated as of the applicable Closing Date,
signed by an executive officer of the Borrower to the effect that the
representations and warranties set forth in Section 5 of this Agreement are true
and correct as of the applicable Closing Date.

               iv. The Borrower shall have filed all UCC financing statements in
form and substance satisfactory to the Lenders at the appropriate offices to
create a valid and perfected security interest in the Collateral (as defined in
the Security Agreement).

          b. Absence of Certain Events. The occurrence of a Material Adverse
Effect (as defined below) shall not have occurred or be occurring as of any
Closing Date.

     5. Representations and Warranties. To induce each Lender, severally and not
jointly, to make the Loan, the Borrower hereby represents and warrants to each
Lender that at and as of the date hereof:

          a. The Borrower has been duly incorporated and is validly existing and
in good standing under the laws of the state of Delaware, with full corporate
power and authority to own, lease and operate its properties and to conduct its
business as currently conducted. The Borrower is duly qualified as a foreign
entity to do business and is in good standing in every jurisdiction in which its
ownership of property or the nature of the business conducted by it makes such
qualification necessary and where the failure so to qualify would have a
Material Adverse Effect. "Material Adverse Effect" means any material adverse
effect on the ability of the Borrower to perform its obligations hereunder or on
the business, operations, properties, prospects or financial condition of the
Borrower.

          b. Each of the Loan Documents has been duly authorized, validly
executed and delivered on behalf of the Borrower and is a valid and binding
obligation of the Borrower enforceable against the Borrower in accordance with
its terms, subject to limitations on enforcement by general principles of equity
and by bankruptcy or other laws affecting the enforcement of creditors' rights
generally, and the Borrower has full power and authority to execute and deliver
this Agreement and the Loan Documents and to perform its obligations hereunder
and thereunder.

          c. The execution, delivery and performance of this Agreement and the
Loan Documents will not (i) conflict with or result in a breach of or a default
under any of the terms or provisions of, (A) the Borrower's certificate of
incorporation or by-laws, or (B) any material provision of any indenture,
mortgage, deed of trust or other material agreement or instrument to

                                       2

<PAGE>

which the Borrower is a party or by which it or any of its material properties
or assets is bound, (ii) result in a violation of any material provision of any
law, statute, rule, regulation, or any existing applicable decree, judgment or
order by any court, Federal or state regulatory body, administrative agency, or
other governmental body having jurisdiction over the Borrower, or any of its
material properties or assets or (iii) result in the creation or imposition of
any material lien, charge or encumbrance upon any material property or assets of
the Borrower or any of its subsidiaries pursuant to the terms of any agreement
or instrument to which any of them is a party or by which any of them may be
bound or to which any of their property or any of them is subject.

          d. No consent, approval or authorization of or designation,
declaration or filing with any governmental authority on the part of the
Borrower is required in connection with the valid execution and delivery of this
Agreement or the Loan Documents.

All representations and warranties made by the Borrower under or in connection
with this Agreement shall survive the making of the Loans and issuance and
delivery of the Note to the Lenders, notwithstanding any investigation made by
the Lenders or on the Lenders' behalf. All statements contained in any
certificate or financial statement delivered by the Borrower to the Lenders
under this Agreement or any other Loan Document shall constitute representations
and warranties made by the Borrower hereunder.

     6. Events of Default; Remedies. Upon the occurrence of any of the following
(each, an "Event of Default"):

          a. the Borrower shall fail to make the payment of any amount of any
principal outstanding after the date such payment shall become due and payable
hereunder; or

          b. the Borrower shall fail to make any payment of interest after the
date such interest shall become due and payable hereunder; or

          c. any representation, warranty, covenant or certification made by the
Borrower herein, in the Notes, any other Loan Document or in any certificate or
financial statement shall prove to have been false or incorrect or breached in a
material respect on the date as of which made; or

          d. the Borrower or any of its subsidiaries shall (i) default in any
payment of any amount or amounts of principal of or interest on any indebtedness
for borrowed money (the "Indebtedness") (other than the Indebtedness hereunder)
the aggregate principal amount of which Indebtedness of all such persons is in
excess of $100,000, whether such Indebtedness now exists or shall hereinafter be
created, and such default entitles the holder thereof to declare such
indebtedness to be due and payable, and such indebtedness has not been
discharged in full or such acceleration has not been stayed, rescinded or
annulled within twelve (12) business days of such acceleration, or (ii) default
in the observance or performance of any other agreement or condition relating to
any Indebtedness in excess of $100,000 or contained in any instrument or
agreement evidencing, securing or relating thereto, or any other event shall
occur or condition exist, the effect of which default or other event or
condition is to cause, or to permit the holder or holders or beneficiary or
beneficiaries of such Indebtedness to cause with the giving of notice if
required, such Indebtedness to become due prior to its stated maturity; or

                                       3

<PAGE>

          e. A judgment or order for the payment of money shall be rendered
against the Borrower or any subsidiary in excess of $100,000 in the aggregate
(net of any applicable insurance coverage) for all such judgments or orders
against all such persons (treating any deductibles, self insurance or retention
as not so covered) that shall not be discharged, and all such judgments and
orders remain outstanding, and there shall be any period of thirty (30)
consecutive days following entry of the judgment or order in excess of $100,000
or the judgment or order which causes the aggregate amount described above to
exceed $100,000 during which a stay of enforcement of such judgment or order, by
reason of a pending appeal or otherwise, shall not be in effect; or

          f. the Borrower shall (i) apply for or consent to the appointment of,
or the taking of possession by, a receiver, custodian, trustee or liquidator of
itself or of all or a substantial part of its property or assets, (ii) admit in
writing its inability to pay its debts as such debts become due, (iii) make a
general assignment for the benefit of its creditors, (iv) commence a voluntary
case under the Bankruptcy Code or under the comparable laws of any jurisdiction
(foreign or domestic), (v) file a petition seeking to take advantage of any
bankruptcy, insolvency, moratorium, reorganization or other similar law
affecting the enforcement of creditors' rights generally, (vi) acquiesce in
writing to any petition filed against it in an involuntary case under the
Bankruptcy Code or under the comparable laws of any jurisdiction (foreign or
domestic), or (vii) take any action under the laws of any jurisdiction (foreign
or domestic) analogous to any of the foregoing; or

          g. a proceeding or case shall be commenced in respect of the Borrower
or any of it's subsidiaries without its application or consent, in any court of
competent jurisdiction, seeking (i) the liquidation, reorganization, moratorium,
dissolution, winding up, or composition or readjustment of its debts, (ii) the
appointment of a trustee, receiver, custodian, liquidator or the like of it or
of all or any substantial part of its assets or (iii) similar relief in respect
of it under any law providing for the relief of debtors, and such proceeding or
case described in clause (i), (ii) or (iii) shall continue undismissed, or
unstayed and in effect, for a period of thirty (30) consecutive days or any
order for relief shall be entered in an involuntary case under the Bankruptcy
Code or under the comparable laws of any jurisdiction (foreign or domestic)
against the Borrower or any of its subsidiaries or action under the laws of any
jurisdiction (foreign or domestic) analogous to any of the foregoing shall be
taken with respect to the Borrower or any of its subsidiaries and shall continue
undismissed, or unstayed and in effect for a period of thirty (30) consecutive
days; or

          h. The occurrence of any event which has a Material Adverse Effect.

     THEN, the Lenders may, at their election and without demand or notice of
any kind, which are hereby waived, declare the unpaid balance of the Notes, and
accrued interest thereon, immediately due and payable, proceed to collect the
same, and exercise any and all other rights, powers and remedies given it by
this Agreement, the Notes and the other Loan Documents or otherwise at law or in
equity.

     7. Miscellaneous.

          a. The representations and warranties of the Borrower contained herein
shall survive the making of the Loans and shall remain effective until all
indebtedness contemplated hereby shall have been paid by the Borrower in full.

                                       4

<PAGE>

          b. This Agreement shall be governed by and construed in accordance
with the laws of the State of New York without giving effect to the choice of
law provisions. This Agreement shall not be interpreted or construed with any
presumption against the party causing this Agreement to be drafted.

          c. Each of the Borrower and each Lender (i) hereby irrevocably submits
to the jurisdiction of the United States District Court sitting in the Southern
District of New York and the courts of the State of New York located in New York
county for the purposes of any suit, action or proceeding arising out of or
relating to this Agreement or the Loan Documents and (ii) hereby waives, and
agrees not to assert in any such suit, action or proceeding, any claim that it
is not personally subject to the jurisdiction of such court, that the suit,
action or proceeding is brought in an inconvenient forum or that the venue of
the suit, action or proceeding is improper. Each of the Borrower and each Lender
consents to process being served in any such suit, action or proceeding by
mailing a copy thereof to such party at the address set forth in Section 7(j)
below and agrees that such service shall constitute good and sufficient service
of process and notice thereof. Nothing in this Section 7(c) shall affect or
limit any right to serve process in any other manner permitted by law.

          d. Any forbearance, failure, or delay by a Lender in exercising any
right, power, or remedy shall not preclude the further exercise thereof, and all
of such Lender's rights, powers, and remedies shall continue in full force and
effect until specifically waived in writing by such Lender.

          e. This Agreement may be executed in two or more counterparts, all of
which shall be considered one and the same agreement and shall become effective
when counterparts have been signed by each party and delivered to the other
party.

          f. The headings of this Agreement are for convenience of reference and
shall not form part of, or affect the interpretation of, this Agreement.

          g. If any provision of this Agreement shall be invalid or
unenforceable in any jurisdiction, such invalidity or unenforceability shall not
affect the validity or enforceability of the remainder of this Agreement or the
validity or enforceability of this Agreement in any other jurisdiction.

          h. The Borrower shall reimburse the Lenders, on demand, for all
reasonable fees and costs incurred by the Lenders (including reasonable fees and
costs of the Lenders' counsel) in connection with the enforcement of the
Lenders' rights and remedies thereunder.

          i. This Agreement and the instruments referenced herein contain the
entire understanding of the parties with respect to the matters covered herein
and therein. No provision of this Agreement may be waived or amended other than
by an instrument in writing signed by the party to be charged with enforcement.

          j. Any notices, demands or waivers required or permitted to be given
under the terms of this Agreement shall be in writing and shall be sent by
certified or registered mail (return receipt requested) or delivered personally
or by courier (including a recognized overnight delivery service) or by
facsimile and shall be effective five (5) days after being placed in the mail,
if mailed, or upon receipt, if delivered personally or by courier, or by
facsimile (if received

                                       5

<PAGE>

during normal business hours), in each case to the address of the party to
receive such notice, demand or waiver as set forth below:

               If to the Borrower:

                    Speedcom Wireless Corporation
                    7020 Professional Parkway East
                    Sarasota, Florida 34240
                    Attention: Sara Byrne, Secretary
                    Fax No.: (941) 907-2394

               If to North Sound Legacy Institutional Fund LLC or North Sound
               Legacy International Ltd.:

                    c/o North Sound Capital LLC
                    53 Forest Avenue, Suite 202
                    Old Greenwich, CT 06870
                    Attention: Andrew Wilder
                    Fax No.: (203) 967-5701

               with a copy to:

                    Jenkens & Gilchrist Parker Chapin LLP
                    The Chrysler Building
                    405 Lexington Avenue
                    New York, New York 10174
                    Attention: Christopher S. Auguste
                    Tel. No.: (212) 704-6000
                    Fax No.: (212) 704-6288

     Each party shall provide notice to the other party of any change in
address, such notice to become effective upon receipt.

          k. This Agreement shall be binding upon and inure to the benefit of
the parties and their successors and assigns. The Borrower shall not assign this
Agreement or any rights or obligations hereunder without the prior written
consent of the Lenders. Notwithstanding the foregoing, each Lender may assign
its rights hereunder to any other person or entity without the consent of the
Borrower.

          l. This Agreement is intended for the benefit of the parties hereto
and their respective permitted successors and assigns, and is not for the
benefit of, nor may any provision hereof be enforced by, any other person.

          m. All remedies of the Lenders (i) are cumulative and concurrent, (ii)
may be exercised independently, successively or together against the Borrower,
(iii) shall not be exhausted by any exercise thereof, but may be exercised as
often as occasion therefor may occur, and (iv) shall not be construed to be
waived or released by the Lenders' delay in exercising, or failure to exercise,
them or any of them at any time it may be entitled to do so.

                                       6

<PAGE>

     By executing the appropriate signature line below, the Borrower, intending
to be legally bound hereby, agrees to the terms and conditions of this Agreement
as of the date hereof.

                                       Very truly yours,

                                       NORTH SOUND LEGACY INSTITUTIONAL FUND LLC

                                       By:
                                           -------------------------------------
                                           Name:
                                           Title:

                                       NORTH SOUND LEGACY INTERNATIONAL LTD.

                                       By:
                                           -------------------------------------
                                           Name:
                                           Title:

SPEEDCOM WIRELESS CORPORATION

By:
    ------------------------------
    Name: Michael Sternberg
    Title: Chief Executive Officer

                                       7

<PAGE>

                                    Exhibit A
                                  Form of Note

                                       8

<PAGE>

                                    Exhibit B
                           Form of Security Agreement

                                       9

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