transponder check?

Greetings,

I'm expecting to make the first flight of an RV-3 later this month, and am
trying to figure out exactly what needs to be done about the transponder.
Does anyone know for sure? Since the plane is day VFR only, I'm pretty sure
I don't need to have the pitot static system tested.

Lots of people don't have any sort of certification done on experimentals,
but I think something is probably required. It seems like I've seen a
statement that says the manufacturer of the aircraft (that's me) is
responsible for verifying the operation of the transponder. If I call up
ATC from outside their airspace, and ask for a readout, isn't that verifying
the operation.

The minimum that I imagine, is having the transponder bench tested, which is
stupid, since it's a new unit, and was certainly tested at the factory.
More likely, the encoder (also factory new) should be tested with the
transponder on the bench to verify altitude readings, but that doesn't test
my wiring, which is the only real variable. No local avionics shop will come
to the airport to do a field test either.

FWIW, I called AOPA, and they didn't seem to really know. I have a call
into the EAA, and hope to get a reply later today. Naturally, the avionics
shops tell you that you need "the works". What do I really need?

Rusty
Turbo Mazda 13B powered RV-3 (zoom, zoom, zoom)