4 1 frm4spr.txt MAY 2002 FORM 4 - P. DAVID SPURLIN U. S. SECURITIES AND EXCHANGE COMMISSION Washington, D. C. 20549 FORM 4 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(f) of the Investment Company Act of 1940 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligatons may continue. See Instruction 1(b). 1. Name and Address of Reporting Person* (Last) Spurlin (First) P. (Middle)David (Street) 541 Sterling Drive (City) Richardson (State) TX (Zip) 75081 2. Issuer Name and Ticker or Trading Symbol Microwave Transmission Systems, Inc. 3. IRS or Social Security Number of Reporting Person (Voluntary) 4. Statement for Month/Year May 2002 5. If Amendment, Date of Original (Month/Year) 6. Relationship of Reporting Person to Issuer (Check all applicable) ( X ) Director ( X ) 10% Owner ( X ) Officer (give title below) ( ) Other (specify below) Chief Executive Officer

* If the Form is filed by more than one Reporting Person, see Instruction 5(b)(v) Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

8. Price9. Number 10.Owner- 11.Na- of of Deriv- ship ture Deriv- ative Form of In- ative Secur- of De- direct Secur- ities rivative Bene- ity Bene- Secu- ficial ficially rity: Own- (Instr. 5) Owned Direct ership at End (D) or (Instr. of Indi- 4.) Month rect (I) (Instr. 4) (Instr. 4) Explanation of Responses:

See 18 U.S.C. 1001 and 15 U.S.C. 78(ff)(a) Note: File three copies of this Form, one of which must be manually signed. If space provided is insufficient. See Instruction 6 for procedure. Alternatively, this form is permitted to be submitted to the Commission in electronic format at the option of the reporting person pursuant to Rule 101(b) (4) of Regulation S-T.

MICROWAVE TRANSMISSION SYSTEMS INC 4