On Wednesday, August 7, 2013 2:16:48 PM UTC-7, wrote:
PowerFlarm FirmWare version 3.31

Thanks for the tip on ver 3.31. I did not know that was available and it does include a change for own transponder supression.

However, the release notes include -

Known issues:
- Mode C targets at own altitude may be suppressed.


What is the use of a PCAS function that does not reliably detect targets at own ship altitude? These are the ones that can kill you.

Why would anyone part with a ZAON MRX that does reliably detect mode C targets at own altitude?

ZAON has worked out how to inhibit own tranponder alerting without suppresing other same altitude returns. I don't think it was easy for them to achieve though, and there are maintenance menus for tailoring the supression characteristics to a specific installation.

Andy