PaulSS wrote: I might start asking uAvionix whether their efforts might be better spent receiving PAW
I seem to remember their initial advertising (before it had actually hit the streets) said it would do this very thing.
Clever wording of their Flarm reception claim. It may be low cost to receive it but you then have to display it. Isn't the cost of Flarm on SD > licence fee for PAW?
I know, I'm just evilly turning the long-standing mill wheel 
PS: We had something similar on the Tornado radar warning and homing receiver that was eventually ditched as it just was not accurate enough as there were just too many variables.
I'm surprised they had difficulty designing an RWR that only had to look in your 5-7 o'clock.....'cos that's where everybody was, saddled up and gun tracking 
LOL - once a gobby Matelot, always a gobby Matelot...
Yes, we tried range estimation on received strength from emitters but actually triangulation through interferometer arrays and fine angle of arrival fused to RADAR/data-link tracks were far better. Obviously, these days there is far more automation involved but the principles are just the same. Received power to try and indicate range when the power is variable, the antennae placement is random, free-space path loss provides further variance and other laws of physics are always going to make this a very random result.
I guess the guys at uAvionix decided that receiving PAW was not worth the squeeze after originally looking at it. That is probably why they spent some time on the Mode C/S receive function (against a far higher number of aircraft fitted with transponders than PAW) that they decided would not really offer any benefit in the end. Seeing as Lee’s PAW is now getting towards 3,000 then it might be better to put that antenna and receiver in SkyEcho 2 to use to look for PAW because at least the signal comes with a position.
As I said before, if I can see a PAW and they can see me then that has to be a good thing. Even if it it is sharing detection cycles with the receiver detecting FLARM that are using adjacent frequencies.
Outwards turn for combat, go!
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