On Friday, April 18, 2014 7:16:26 AM UTC-7, Andy wrote:
On Sunday, April 13, 2014 6:18:09 PM UTC-7, Ramy wrote:

Since you don't have a transponder just set the transponder parameter to negative in the config file and nothing will get suppressed.

You will need to switch to latest firmware sooner or later since previous one will expire.


Ramy

Do you know if FLARM are working this? The suppression of same altitude mode C targets is a really poor solution to the spurious own transponder alerting problem.


Suppression of the local Mode C transponder is done by suppressing same-altitude Mode C targets. That's the main bit of info that the system has to use to do that suppression of the local transponder. Flarm can do things to try to minimize suppression of other transponders but unlike Mode S there is no hard-guaranteed way to suppress only the local Mode C transponder. So this is always going to involve a lot of art as well as science.

Mode S is a different beast where you have a unique ICAO address on each Mode S interrogation. But even a Mode S transponder has to reply to legacy Mode A/C interrogations, and if those are happening then you are back in the same boat. Given that Flarm have been tweaking stuff related to this in recent firmware releases and are warning about same altitude Mode C suppression in 3.4 then I'd assume they are still working on improving all this.

If your or other gliders in the area have Mode S transponders make sure that PowerFLARM and the Mode S transponders in all the gliders are properly configured with the correct ICAO address for those aircraft. And if there is no local transponder follow the advice Ramy already offered.