In article , "C J Campbell"
writes:

If the trasnponder automatically goes to standby
when the
airspeed is below stall, this could be a big problem.


There should be; I'll check it out.

The Garmin 330 Mode S transponder has this feature of Automatic ALT/GND
Switching. It is enabled/disabled during initial configuration. It can be
changed with some effort but not during flight.

Chuck