On Monday, March 18, 2013 11:37:46 AM UTC-4, John Carlyle wrote:
On Monday, March 18, 2013 10:44:54 AM UTC-4, Andy wrote:

On Mar 17, 6:03*pm, Evan Ludeman wrote:



*Sadly, my mode c/s pcas range on powerflarm still stinks, it's one or two miles *at best*. *Saw a bizjet rip by at less than 2 miles. *Not a peep :-(.





I'm glad to hear another report of this. It exactly matches my



experience. Head on traffic less than a mile away - in sight ,



alerted by ZAON PCAS, and Power FLARM portable indicated nothing!



I hope FLARM will eventually recognize this problem and correct it.



Until then I don't fly without my ZAON MRX.



Andy



I seem to remember about a year ago Darryl Ramm wrote about the difficulties involved in doing what the Zaon MRX does so well. There are a lot of non-trivial problems to be solved, it's by no means straight forward.



I'll see if I can find his post; if I do I'll write again. Or perhaps Darryl will see this and re-post his excellent explanation.



-John, Q3

Darryl had two really good posts on the Zaon MRX that I was remembering:
https://groups.google.com/forum/#!ms...U/zhcTC9v2SpkJ
https://groups.google.com/forum/#!ms...E/edTRxve7aMAJ

Darryl's first post explains some of the problems Zaon deals with in detecting another transponder. His second explains some of the limitations of the Zaon.

It's pretty amazing that the Zaon works as well as it does, and it's also clear that FLARM had a pretty big technical problem on its hands in getting the PowerFLARM to work as well as the Zaon.

-John, Q3