In article , Alan Browne
wrote:

How (exactly) are you getting altitude
information on these a/c (what equipment that isn't an ADS-B receiver
that you're getting transponder data on;

mode-c transponder responses.

how is it displayed?

http://www.pooleys.com/images/products/1665.jpg
http://i19.servimg.com/u/f19/12/09/94/31/atd110.jpg

Hmmm- let's see a photo of _yours_ in operation.

what for? you'll claim it was faked.

i'll post a photo of what i have on the condition that you'll admit you
were wrong, that you didn't know about such devices and also to stop
arguing with every post i make. deal?

Be clear - don't say HS like "already said" 'cause you've actually said
nothing at all.

actually, i've said quite a bit, but you're so intent on arguing to pay
attention to any of it.

I'm ROTFL lauging at what lengths you've gone to defend the
indefensible. You see there's a big fly in the ointment about the
device you claim to have, buy you have no clue what that fly is.

the only fly is *you*, who has no clue about such devices and even
claimed they didn't exist when it's clear that they do.

now that you've been shown to be wrong, you come up with some
mysterious issue that you refuse to articulate.

In article , Alan Browne
wrote:
There are such receivers for ADS-B. They run about $500 or so (maybe
cheaper now). There were no transponder receivers (for older
traditional (pre-ADS-B) transponders that I know of other than test
equipment or actual decoding gear in the ATC radar receiver shed.

Even if you had such it would tell you quite little as you would not
know the range/bearing from the radar that ping'd it (or from you). You
would get a transponder code and optionally altitude (and some other
stuff that isn't especially relevant).