At 08:36 AM 21/04/2012, you wrote:
>Not true, TCAS will trigger your transponder outside radar coverage.

Thanks Mike.
Is that sort of TCAS still a big boy's (heavy metal) toy or is it creeping into GA?

When I have used GA a/c equip with a so-called 'TCAS', I was told it relied upon using signals from interrogated transponders. It gave only rudimentary information such as aircraft at, above or below, and no heading information.




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What you has is most likely a Zaon PCAS like the MRX. If in radar coverage it detects transponder returns and gives you relative altitude and rates of climb/descent of the target.

It is a listen only device. They make a more expensive unit that gives relative bearing of the target as well.

If you are outside radar coverage and it gives a target it is likely a regional airliner or other heavy metal whose TCAS will trigger the Zaon device.

Mike 
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