Document:

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10.2    Debt Conversion and Funding Agreement dated September 30, 2004
        ERF Wireless, Inc. Eagle R.F. International, Inc., and Investor.

                      DEBT CONVERSION AND FUNDING AGREEMENT

         This Debt Conversion and Funding Agreement ("Agreement") dated
September 30, 2004 is between ERF Wireless, Inc., a Nevada corporation,
("ERFW"), Eagle R. F. International, Inc., a Texas corporation ("Company"), and
the persons listed on the signature page of this Agreement ("Investor").

         WHEREAS, the Company needs to restructure and raise additional capital;

         WHEREAS, the Company's stockholders have entered a Stock Purchase
Agreement with ERFW; and

         WHEREAS, the Investor is aware of the terms and conditions of the Stock
Purchase Agreement mentioned above and, subject to the terms and conditions of
this Agreement, is willing (1) to consent to a restructuring of the Company, (2)
to convert all of Investor's claims against the Company's for shares of ERFW's
Series A Convertible Preferred Stock, and (3) to make an additional cash
investment for shares of ERFW's Series A Convertible Preferred Stock;

         NOW THEREFORE, in consideration of the foregoing and for other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto agree as follows:

         Simultaneous with the closing of the Stock Purchase Agreement between
ERFW and the Company's stockholders:

1. Investor shall convert all of Investor's claims against the Company for
shares of ERFW's Series A Convertible Preferred Stock (the "Securities"). As of
the date hereof, the Investor holds notes and other claims against the Company
in the total amount of $487,142.33, including all principal, interest, fees,
expenses, and costs of every nature.

2. ERFW's capital structure is comprised of Five Hundred Million shares
(500,000,000) of capital stock, of which Four Hundred Seventy Five Million
(475,000,000) shares of the par value of $.001 each are common stock and of
which Twenty Five Million (25,000,000) shares of the par value of $.001 each are
preferred stock. As of the date hereof, ERFW has not more that Four Hundred
Thousand (400,000) shares of common stock issued and outstanding, Two Million
Eight Hundred Eighty Thousand (2,880,000) shares of common stock reserved for
issuance underlying warrants and stock options, and Eighteen Million Six Hundred
Seventy Six Thousand Three Hundred Forty Seven (18,676,347) shares reserved for
issuance upon conversion of the Purchaser's 1,000,000 shares of issued and
outstanding Series A Convertible Preferred Stock. As of the date hereof, the

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Purchaser has designated Two Million Five Hundred Thousand (2,500,000 shares of
its preferred stock as Series A Convertible Preferred Stock of which One Million
(1,000,000) shares are issued and outstanding. All issued and outstanding shares
are legally issued, fully paid, and non-assessable, and are not issued in
violation of the preemptive or other right of any person.

3. ERFW shall issue the Investor one (1) share of its Series A Convertible
Preferred Stock for every Fifty Cents ($.50) in claims converted and one (1)
share of its Series A Convertible Preferred Stock for every Fifty Cents ($.50)
invested during the next 90 days. For example, the Investor shall receive
1,500,000 shares of ERFW's Series A for an investment of $750,000.

4. The Investor understands and agrees that all securities will be issued with a
restrictive legend to the effect that: "THE SHARES REPRESENTED BY THIS
CERTIFICATE HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 (THE
"ACT") AND ARE "RESTRICTED SECURITIES" AS THAT TERM IS DEFINED IN RULE 144 UNDER
THE ACT. THE SHARES MAY NOT BE OFFERED FOR SALE, SOLD OR OTHERWISE TRANSFERRED
EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE ACT OR PURSUANT
TO AN EXEMPTION FROM REGISTRATION UNDER THE ACT, THE AVAILABILITY OF WHICH IS TO
BE ESTABLISHED TO THE SATISFACTION OF THE COMPANY."

5. Private Transaction

A. PRIVATE TRANSACTION. Investor and ERFW understand each that the sale and
exchange of securities contemplated herein constitutes a private, arms-length
transaction between a willing seller and a willing buyer without the use or
reliance upon a broker, distribution or securities underwriter.

B. PURCHASE FOR INVESTMENT. Investor is not an underwriters of, or dealer in the
securities to be exchanged hereunder. Further, Investor is acquiring the
securities for investment purposes and not with a view to resell the securities.

C. INVESTMENT RISK. Because of Investor's financial position and other factors,
the transaction contemplated by this Agreement may involve a high degree of
financial risk, including the risk that Investor may lose its entire investment
in the securities.

D. ACCESS TO INFORMATION. Investor and Investor's advisors have been afforded
the opportunity to discuss the transaction with legal and accounting
professionals and to examine and evaluate the financial impact of the exchange
contemplated herein.

6. Representations and Warranties of Investor

Investor hereby covenants with, represents, and warrants that:

A. ABILITY. This Agreement has been duly executed and delivered by Investor and
constitutes a binding, and enforceable obligation of Investor;

B. THIRD PARTY CONSENT. No authorization, consent, or approval of, or
registration or filing with, any governmental authority or any other person is
required to be obtained or made by Investor in connection with the execution,
delivery, or performance of this Agreement;

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C. LITIGATION. Investor is not a defendant against whom a claim has been made or
a judgment rendered in any litigation or proceedings before any local, state or
federal government, including but not limited to the United States, or any
department, board, body or agency thereof;

7. Miscellaneous

A. ENTIRE AGREEMENT. This Agreement sets forth the entire understanding between
the parties hereto and no other prior written or oral statement or agreement
shall be recognized or enforced.

B. SEVERABILITY. If a court of competent jurisdiction determines that any clause
or provision of this Agreement is invalid, illegal or unenforceable, the other
clauses and provisions of the Agreement shall remain in full force and effect
and the clauses and provision which are determined to be void, illegal or
unenforceable shall be limited so that they shall remain in effect to the extent
permissible by law.

C. ASSIGNMENT. None of the parties hereto may assign this Agreement without the
express written consent of the other parties and any approved assignment shall
be binding on and inure to the benefit of such successor or, in the event of
death or incapacity, on assignor's heirs, executors, administrators and
successors.

D. APPLICABLE LAW. This Agreement has been negotiated and is being contracted
for in the United States, State of Texas, it shall be governed by the laws of
the United States, State of Texas, notwithstanding any conflict-of-law provision
to the contrary.

E. ATTORNEY'S FEES. If any legal action or other proceeding (non-exclusively
including arbitration) is brought for the enforcement of or to declare any right
or obligation under this Agreement or as a result of a breach, default or
misrepresentation in connection with any of the provisions of this Agreement, or
otherwise because of a dispute among the parties hereto, the prevailing party
will be entitled to recover actual attorney's fees (including for appeals and
collection) and other expenses incurred in such action or proceeding, in
addition to any other relief to which such party may be entitled.

F. NO THIRD PARTY BENEFICIARY. Nothing in this Agreement, expressed or implied,
is intended to confer upon any person, other than the parties hereto and their
successors, any rights or remedies under or because of this Agreement, unless
this Agreement specifically states such intent.

G. COUNTERPARTS. It is understood and agreed that this Agreement may be executed
in any number of identical counterparts, each of which may be deemed an original
for all purposes.

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H. FURTHER ASSURANCES. At any time, and from time to time after the debt for
equity swap, each party hereto will execute such additional instruments and take
such action as may be reasonably requested by the other party to carry out the
intent and purposes of this Agreement.

I. AMENDMENT OR WAIVER. Every right and remedy provided herein shall be
cumulative with every other right and remedy, whether conferred herein, at law,
or in equity, and may be enforced concurrently herewith, and no waiver by any
party of the performance of any obligation by the other shall be construed as a
waiver of the same or any other default then, theretofore, or thereafter
occurring or existing. A writing signed by all parties hereto may amend this
Agreement.

J. HEADINGS. The section and subsection headings in this Agreement are inserted
for convenience only and shall not affect in any way the meaning or
interpretation of this Agreement.

K. FACSIMILE. A facsimile, telecopy or other reproduction of this Agreement may
be executed by one or more parties hereto and such executed copy may be
delivered by facsimile or similar instantaneous electronic transmission device
pursuant to which the signature of or on behalf of such party can be seen, and
such execution and delivery shall be considered valid, binding and effective for
all purposes. At the request of any party hereto, all parties agree to execute
an original of this Agreement as well as any facsimile, telecopy or other
reproduction hereof.

         IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date set forth above.

                                        "ERFW"
                                        ERF WIRELESS, INC., A NEVADA CORPORATION

                                        By: /s/ R. Greg Smith
                                            -----------------
                                        Name: R. Greg Smith
                                        Title: Chief Executive Officer

                                        The "Company"
                                        EAGLE R. F. INTERNATIONAL, INC., A TEXAS
                                        CORPORATION

                                        By: /s/ Brian Cubley
                                            ----------------
                                        Name: Brian Cubley
                                        Title: President

                                        [Continued on following page]

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                                        Persons referred to herein above as
                                        "Investor"

                                        PAULINE TRUST

                                        By: /s/ Sammy Fleschler
                                            -------------------
                                        Name: Sammy Fleschler
                                        Title: Trustee

                                        CARSON FAMILY TRUST

                                        By: /s/ Sammy Fleschler
                                            -------------------
                                        Name: Sammy Fleschler
                                        Title: Trustee

                                        HC1 TRUST

                                        By: /s/ Sammy Fleschler
                                            -------------------
                                        Name: Sammy Fleschler
                                        Title: Trustee

                                        LEOPARD FAMILY TRUST

                                        By: /s/ Sammy Fleschler
                                            -------------------
                                        Name: Sammy Fleschler
                                        Title: Trustee

                                        JAUQUINE TRUST

                                        By: /s/ Sammy Fleschler
                                            -------------------
                                        Name: Sammy Fleschler
                                        Title: Trustee

                                        BAILEY TRUST

                                        By: /s/ H. Dean Cubley
                                            ------------------
                                        Name: H. Dean Cubley
                                        Title: Trustee

                                       5<PAGE>

Exhibit 10.13 - Promissory Note for $500,000 dated September 27, 2004.

                                 PROMISSORY NOTE
$500,000                                                           Sept 27, 2004

FOR VALUE RECEIVED, Amistar Corporation, a California corporation ("MAKER"),
hereby unconditionally promises to pay to the order of Gordon S. Marshall, an
individual ("LENDER"), in lawful money of the United States of America and in
immediately available funds, the principal sum of Five hundred Thousand
($500,000) (the "PRINCIPAL AMOUNT"), together with accrued and unpaid interest
thereon, each due and payable on the dates and in the manner set forth below.

1)       INTEREST RATE. Subject to the terms hereof, the rate of interest shall
         be seven percent (7.0%) per annum (the "INTEREST RATE"). Interest shall
         be calculated on the basis of a 360-day year for the actual number of
         days elapsed.

2)       PAYMENT SCHEDULE. Subject to Sections 3 and 6 below, Maker shall pay
         the principal and interest in accordance with the payment schedule set
         forth below. All payments shall be applied first to any charges due
         hereunder, then to accrued interest, and then to the principal balance.

         a)       No amounts shall be due or payable prior to December 31, 2004.

         b)       The entire outstanding Principal Amount and all accrued
                  interest shall be due and payable in full on December 31, 2004
                  (the "MATURITY DATE").

3)       PREPAYMENTS.

         (a)      This Note may be prepaid in whole or in part at any time
                  without premium or penalty.

         (b)      All amounts outstanding under this Note shall be prepaid in
                  full immediately prior to (i) Maker's dissolution or
                  liquidation, or (ii) the acquisition by a third party of all
                  or substantially all of Maker's capital stock, equity
                  interests or assets.

         (c)      The Prepayment shall be exercised by written notice. Such
                  notice shall identify the Principal Amount ("PREPAYMENT
                  PRINCIPAL") and the interest ("PREPAYMENT INTEREST" and,
                  together with the Prepayment Principal, the "PREPAYMENT
                  AMOUNT") outstanding under this Note and shall notify Maker of
                  the time, place and date for settlement of such repayment,
                  which shall be scheduled by Lender within fifteen (15) days
                  following the date of such notice.

4)       PLACE OF PAYMENT. All amounts payable hereunder shall be made at the
         place of payment specified in writing by Lender.

5)       SUBORDINATION This note shall be subordinated to Makers obligations in
         that certain Reimbursement Agreement, Dated as of October 1, 1995, as
         amended (the "Reimbursement Agreement").

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6)       DEFAULT. Each of the following events shall be an "EVENT OF DEFAULT"
         hereunder:

         (a)      Maker fails to pay timely any of the principal, interest or
                  other amounts due under this Note on the date the same become
                  due and payable;

         (b)      Maker files any petition or commences any case or other
                  proceeding with respect thereto for relief under any
                  bankruptcy, reorganization, arrangement, insolvency,
                  readjustment of debt, liquidation or moratorium law or any
                  other law for the relief of, or relating to, debtors, now or
                  hereafter in effect, or makes any assignment for the benefit
                  of creditors, or admits in writing its inability to pay or
                  generally fails to pay its debts as they mature or become due,
                  or Maker dissolves or ceases to continue to exist, or takes
                  any corporate action in furtherance of any of the foregoing;
                  or

         (c)      an involuntary petition is filed or any case or other
                  proceeding is commenced against Maker (unless such petition is
                  dismissed or discharged within sixty (60) days) under any
                  bankruptcy, reorganization, arrangement, insolvency,
                  adjustment of debt, liquidation or moratorium statute now or
                  hereafter in effect, or a custodian, receiver, trustee,
                  liquidator, assignee for the benefit of creditors (or other
                  similar official) is applied for or appointed for Maker or is
                  applied for or appointed to take possession, custody or
                  control of any property of Maker.

7)       REMEDIES. Upon the occurrence and during the continuance of an Event of
         Default hereunder and subject to the subordination provisions
         in Section 5:

         i)       all unpaid principal, accrued interest and other amounts owing
                  hereunder shall, at the option of Lender (and, in the case of
                  an Event of Default pursuant to Section 6(b) or (c) above,
                  automatically) be immediately due, payable and collectible by
                  Lender pursuant to applicable law; and

         ii)      Lender may exercise any and all rights and remedies it may
                  have under this Note and/or under applicable law.

         iii)     All rights and remedies shall be cumulative and not exclusive.
                  The failure of Lender to exercise all or any of its rights,
                  remedies, powers or privileges hereunder or any other
                  agreement or applicable law in any instance shall not
                  constitute a waiver thereof in that or any other instance.

8)       EXPENSES. If the payment of principal or interest of this Note is not
         paid when due, an Event of Default shall have occurred, or Maker
         otherwise breaches its obligations under this Note, Maker shall pay
         reasonable attorneys' fees to Lender together with reasonable costs and
         expenses of collection, including, without limitation, any attorneys'
         fees, costs and expenses relating to any proceedings with respect to
         the bankruptcy, reorganization, insolvency, readjustment of debt,
         dissolution or liquidation of Maker or any party to any agreement or
         instrument securing this Note.

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9)       MAXIMUM RATE. All agreements which either are now or which shall become
         agreements between Maker and the holder of this Note are hereby
         expressly limited so that in no contingency or event whatever, whether
         by reason of deferment or advancement of the indebtedness represented
         by this Note, acceleration of the maturity date of this Note, or
         otherwise, shall the amount paid or agreed to be paid to the holder of
         this Note for the use, forbearance or detention of the indebtedness
         evidenced hereby exceed the maximum amount of interest permissible
         under applicable law. If at any time, from any circumstance whatsoever,
         fulfillment of any provision of this Note or any other agreement
         between Maker and the holder hereof, shall result in or involve
         payments or performance which would exceed the maximum legal interest
         rate, then, IPSO FACTO, the obligation to be fulfilled shall be reduced
         so as not to exceed said maximum legal interest rate.

10)      WAIVER. Maker, for itself and its legal representatives, successors and
         assigns, hereby expressly waives demand, presentment, notice of
         dishonor, protest and notice of protest, and all other demands and
         notices in connection with the delivery, acceptance, performance,
         default or enforcement of this Note and agrees that any extension,
         renewal or postponement of the time of payment or any other indulgence
         to, or release of any person now or hereafter obligated for the payment
         of this Note shall not affect Maker's liability hereunder.

                            [SIGNATURE PAGE FOLLOWS]

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         IN WITNESS WHEREOF, this Note has been duly executed as of the date
first set forth above.

                                MAKER:

                                Amistar Corporation, a California Corporation

                                By:    /s/ Gregory Leiser

                                Name:  Gregory Leiser

                                Title: Vice President Finance and CFO
ATTEST:

By:    /s/ Linda Flanagan

Name:  Linda Flanagan

Title: Accounting staff

Statements contained in this release, which are not purely historical, are
forward-looking statements within the meaning of the Private Securities
Litigation Reform Act of 1995 and are subject to risks and uncertainties such as
those described in the Company's Annual Report on Form 10-K. Actual results may
differ materially from anticipated results.

Amistar Corporation provides industrial automation solutions and
contract-manufacturing services. The Company designs, develops, manufactures,
markets and services a variety of automated equipment used to assemble
electronic components and product identification media to printed circuit boards
and other assemblies. In addition, the Company provides design and manufacturing
resources to create customized factory automation equipment and other products
according to customers' specification in a broad range of industries. The
Company also provides contract-manufacturing services to companies who outsource
the manufacturing of their electronic products. Through its subsidiary, ddn
Corporation, the Company provides automated point-of-sale machines that control
the dispensing of securely stored items such as consumer products, developed
photographs, medications and finished prescriptions to retail customers.

Additional information about Amistar is available at www.amistar.com and ddn
Corporation at www.ddncorp.com

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