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Continuing problems seeing ATCRBS transponders with ModeSinterrogators
On Oct 6, 10:31*pm, tomlusch
wrote: ;663552 Wrote: Continuing problems seeing ATCRBS transponders with Mode S interrogators Hey all, I work in, lets call it 'an associated industry' and we are still seeing ATCRBS transponders that reply to some interrogators, and not to others. At one time this was known as the 'P4 problem', sometimes as the 'Terra problem', just want to ask if anyone out there flying with an ATCRBS xpdr is still having trouble being 'seen' by some interrogators, but no problem with others. Thx- Dave Funny that you should pose such a question Dave. *Just yesterday evening I observed a primary target with our ASR-9 (Mode S) moving ENE at a decent clip. *Used a different display and selected our nearby ARSR (an ATCBI-6) sensor, and saw a rock solid beacon reply, showing that it was an aircraft at 13,000 ft msl. *Never did see a transponder return using our ASR-9. * Take a look at my previous experience with this type of transponder behavior... http://home.columbus.rr.com/lusch/talotta.html ..and get in touch with me. * Tom Luschhttp://tomlusch.com -- tomlusch Hey, Tom. Yeah, I'm familiar with your reports on this / these issues, back when I was building a simulation model of transponders. Seems there are some really old transponders out there, or 'some' (heh) that just don't meet spec. Dave |
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