GPS NMEA Output #1407
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Really not a good idea. Please don´t. Transponders are life saving equipment that TCAS systems rely on to function properly. Don't mess with it. There is a reason they are certified equipment. Just like its GPS source has to be. You need a certified gps signal for ads-b output. This one includes a signal quality field that is transmitted on ads-b. If that field is missing, many ATC Radar displays will filter your ads-b signal. XCSoar is for Informational use only. Its not certified for any purpose. (Do i really need to add a disclaimer?) Your transponder is certified. Hooking uncertified equipment to your transponder will probably not go down well upon inspection and is probably only allowed with special precautions under EASA Part M. |
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Hello,
My Trig TT21 transponder accepts GPS related NMEA 0183 sentences over RS-232 on connector pin 5 and with this I can enable ADS-B functionality on it. Now instead of cramming another power consuming GPS dongle, 12V>5V regulator, toggle-switch and fuse in my dashboard, I was thinking if I could use/proxy the GPS data that XCSoar gets from my FLARM Classic.
So this afternoon I wrote a simple driver that does exactly that job. It only outputs GPRMC, GPGGA and GPGSA sensences.
With this output the idea is to connect the TX of a free TTY on the back of my OpenVario to my Trig TT21 pin 5 RX.
I was wondering about your opinion on this. Does it sounds plausible?
Kind regards,
Remco
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