You may have the only known transponder of that variety that has ever been
designed. In the overwhelming predominant world, the test button tests the
receiver only by injecting microwatts of oscillator into the front end.

Jim


(John)
shared these priceless pearls of wisdom:

-Humm, I forgot about that Jim. However most have a self test button
-that causes the transponder to transmit some pulses. I know my 20
-year old Cessna ARC transponder transmits at a low rate when you push
-the test button.
Jim Weir (A&P/IA, CFI, & other good alphabet soup)
VP Eng RST Pres. Cyberchapter EAA Tech. Counselor
http://www.rst-engr.com