Document:

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                                                                   EXHIBIT 10.39
                             RF Monolithics, Inc.
                             Consulting Agreement

This Agreement is entered into this 28/th/ day of June, 2000 by and between RF
Monolithics, Inc. having offices at 4347 Sigma Road, Dallas, Texas 75244 (:RFM")
and Thomas S. Garrett ("Consultant"), whose principal place of business is at
600 Hudnall Court, Keller, Texas 76248. The purpose of the Agreement is to
engage the services of Thomas S. Garrett as a Consultant to RFM.

IT IS AGREED

1.   Responsibilities of Consultant

     A.        Consultant responsibilities under this Agreement shall be to
          perform such duties as necessary and assigned by the President and
          Chief Executive Officer of RFM. Consultant will report to David M.
          Kirk, President and Chief Executive Officer of RFM.

     B.        Consultant responsibilities under this Agreement may include, but
          are not limited to:

          Transitioning RFM's Manufacturing organization into a world-class
          operation where product costs, inventories and cycle time are reduced,
          processes are stable, capacity is assured, outsourcing is evaluated
          and implemented where appropriate and costs are among the lowest in
          the industry.

1.   Terms and Conditions

     Term: The term of this Agreement shall be through January 31, 2001.

     Consulting Fee: Consultant will work full-time, five (5) days per week, and
     be compensated at a rate of $11,666.67 pr month, earned and paid monthly.
     The RFM Restricted Stock which was granted to you on January 26, 2000 and
     its terms as described in the Consulting Agreement dated February 1, 2000
     will remain a part of this Agreement.

     Termination: RFM may terminate this Agreement immediately in the event
     Consultant accepts any employment or consulting arrangements with third
     parties which RFM may, in its reasonable discretion, consider to be
     detrimental to RFM's business interest.
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     Either party may terminate this Agreement at its convenience, for any or no
     reason whatsoever, upon thirty (30) days' prior written notice to the
     other. In such event, Consultant shall continue to provide services until
     the termination date, unless otherwise advised by RFM.

2.   Confidentiality

     Consultant recognizes that RFM has and will have copyrights, business
     affairs, future plans, trade secrets, process information, technical
     information and other proprietary information (collectively, "Information")
     which are valuable, special and unique assets of RFM. Consultant agrees
     that he will not at any time or in any manner, either directly or
     indirectly, use any Information for the Consultant's own benefit, or
     divulge, disclose or communicate in any manner any Information and treat it
     as strictly confidential.

3.   Ownership of Work Project

     Consultant agrees that any and all ideas, improvements, inventions and work
     of authorship conceived, written, created or first reduced to practice in
     the performance of work under this Agreement ("Work Product") shall be the
     sole and exclusively property of RFM and hereby assigns to RFM all its
     rights, titles and interests, in and to, any and all such Work Product.

4.   Survival

     Section 4 shall survive termination or expiration of this Agreement for a
     period of three (3) years from the effective date of such termination or
     expiration.

5.   General

     Consultant will work exclusively for RFM. Consultant shall obtain RFM
     approval prior to engaging in any consulting or other collaboration with
     institutions other than RFM. Consultant shall not work or consult for RFM's
     competitors including, but not limited to, Telefilter, SAWtek, Toko,
     Siemens, TMX, AVX and Panasonic.

     Consultant is not eligible to participate in the Company's employee
     benefits program. This Agreement does not constitute an employment contract
     with RFM.
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This Agreement constitutes the complete understanding and agreement with respect
to the subject matter thereof, and supersedes all prior understandings and
agreements relating to its subject matter. This Agreement may not be waived,
modified or amended unless mutually agreed upon in writing. This Agreement, nor
any rights or obligations, may not be assigned by Consultant without written
consent of RFM. This Agreement shall be governed by the laws of the State of
Texas

Agreed to this 28/th/ day of June, 2000

RF Monolithics, Inc.                        Thomas S. Garrett

/s/ David Kirk                              /s/ Thomas S. Garrett
-------------------------------             ---------------------------------
(Signature)                                         (Signature)

President & CEO                             Consultant
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(Title)                                     (Title)<PAGE>

                                                                   EXHIBIT 10.40
                                 PROMISSORY NOTE

$19,500.00                                                          May 12, 1999
                                                                   Dallas, Texas

     FOR VALUE RECEIVED, David M. Kirk, ("Borrower"), hereby unconditionally
promises to pay to the order of RF Monolithics, Inc., a Delaware corporation
("Lender"), in lawful money of the United States of America and in immediately
available funds, the principal sum of Nineteen Thousand, Five Hundred Dollars
and No Cents ($19,500.00) (the "Loan") together with accrued and unpaid interest
thereon, payable on the dates and in the manner set forth below.

      1.  Principal Repayment. The outstanding principal amount of the Loan
shall be due and payable on May 12, 2002.

     2.   Interest Rate. Borrower further promises to pay interest on the
outstanding principal amount hereof from the date hereof until payment in full,
which interest shall be payable at the rate of Four and Ninety/One Hundredths
percent (4.90%) per annum or the maximum rate permissible by law (which under
the laws of the State of Texas shall be deemed to be the laws relating to
permissible rates of interest on commercial loans), whichever is less. Interest
shall be payable quarterly in arrears not later than the first day of each
calendar quarter for the preceding quarter and shall be calculated on the basis
of a 360-day year for the actual number of days elapsed.

     3.   Place of Payment. All amounts payable hereunder shall be payable at
the office of Lender, unless another place of payment shall be specified in
writing by Lender.

     4.   Application of Payments. Payment on this Note shall be applied first
to accrued interest, and thereafter to the outstanding principal balance
thereof.

     5.   Secured Note. The full amount of this Note is secured by the
Collateral identified and described below. As collateral security for prompt and
complete payment and performance of all obligations of Borrower under this Note
and to induce lender to extend credit, Borrower hereby assigns, conveys, grants,
pledges, and transfers to and creates in favor of Lender a security interest in
all goods and personal property of Borrower whether tangible or intangible and
whether now or hereafter owned by Borrower ("Collateral").

     6.   Default. Each of the following events shall be an "Event of Default"
hereunder:

          (a)  Borrower fails to pay timely any of the principal amount due
under this Note on the date the same becomes due and payable or any accrued
interest or other
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amounts due under this Note on the date the same becomes due and payable or
within five (5) calendar days thereafter;

          (b)  Borrower files any petition or action for relief under any
bankruptcy, reorganization, insolvency, 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 takes any corporate action in
furtherance of any of the foregoing; or

          (c)  An involuntary petition is filed against Borrower (unless such
petition is dismissed or discharged within sixty (60) days), under any
bankruptcy statute now or hereafter in effect, or a custodian, receiver,
trustee, assignee for the benefit of creditors ( or other similar official) is
appointed to take possession, custody, or control of any property of Borrower.

Upon the occurrence of an Event of Default hereunder, all unpaid principal,
accrued interest and other amounts owing hereunder shall, at the option of
Lender, be immediately collectible by Lender pursuant to applicable law.

     7.   Waiver. Borrower waives presentment and demand for payment, notice of
dishonor, protest and notice of protest of this Note, and shall pay all costs of
collection when incurred, including, without limitation, reasonable attorneys'
fees, costs, and other expenses.

     The right to plead any and all statutes of limitations as a defense to any
demands hereunder is hereby waived to the full extent permitted by law.

     8.   Governing Law. This Note shall be governed by, and construed and
enforced in accordance with, the laws of the State of Texas, excluding conflict
of laws principles that would cause the application of laws of any other
jurisdiction.

     9.   Successors and Assigns. The provisions of this Note shall inure to the
benefit of and be binding on any successor to Borrower and shall extend to any
holder hereof.

Borrower                                RF Monolithics, Inc.

/s/ David M. Kirk                       /s/ Sam L. Densmore
-----------------------------           --------------------------------
David M. Kirk                           Sam L. Densmore
                                        President and CEO

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