On Mar 31, 6:50 pm, Sarah Anderson wrote:
Greg Arnold wrote:
I see they want to require transponders in all gliders, with the
transponders always on.

Nice summary. And, in compensation we'd get the low, low transponder code of 0440

I've never heard that low codes would save power, maybe they just wouldn't ping it as
often as 1200

Sarah

Ah, that is not possible. The simple answer is all transponders seeing
an interrogation signal will reply. The SSR can interrogate the
transponder to send it's code (Mode A) or altitude (Mode C). There is
no concept of the SSR being able to "address" a transponder.

Darryl