[Milsurplus] old IFF systems control panels

[Ray Fantini]

My limited understanding of the APX-6 and similiar  generation of WWII
radar  identification transmitters  is they were not remote operated by
the
crew  and the type of radar target generation symbol  that would be
transmitted by their aircraft would be  be preset by the aircrew or by
maintenance.  Nothing  like todays "Transponders" which require the
flight
crew to change the transmitter IDER setting many times during a flight
so
that it could be "interrogated" by the ground. I think that  since  
911
it's not uncommon for even VFR aircraft which normally would have to
squawk at standard 1200 code   to have to set special settings in
designated air space- but the old APX was not that user friendly, and
when the master switch was turned on it sent the signal continiously
which cluttered up the radar screen so it was either ON or OFF. But the
good news, the APX-6 got many folks started in 1296
operations using the modified sets.
Ray Fantini KA3EKH