On Tue, 12 Jun 2007 08:37:53 -0700, "Robert M. Gary"
wrote in
om:

I've found my PCAS system to be very helpful. For a fraction of the
cost of a TIS or TCAS system it lets me know when someone is nearby.
It doesn't see all traffic but it sees much more than I do.

Thanks for the tip. This is the first I've heard of PCAS.

http://www.pcas.ca/
How does PCAS work?

ATC ground stations and active TCAS systems transmit interrogation
pulses on an uplink frequency of 1030 Megahertz. Aircraft
transponders reply on a downlink frequency of 1090 Megahertz. PCAS
devices detect these transponder responses, then analyze and
display conflict information.
MRX-A (Portable Collision Avoidance System) $589.99


It sounds like just the thing for flying in the LA basin, and renter
pilots aren't excluded.