NMEA out to transponder.

[SteveHutt]

The NATS ADS-B Trial is sort of over. NATS will be publishing their final report in a week or so. I saw a preview presentation from NATS yesterday at the CAA Conspicuity Working Group which was very positive.

( I also briefed the CWG on PAW - I took along all the hardware bits and pieces to show to them.)

My hope is that the PAW ADS-B Verification Mode can replace Test Flight/email exchange with NATS that is part of the LAA MOD 7 and MOD 14 approval procedure. I suggested the idea of what I called the PAW ADS-B Message Analyser to Lee ( http://forum.pilotaware.com/index.php/topic,213.0.html ) as a permanent solution is needed because NATS R&D will not wish to be a permanent part of the LAA MOD procedure. Also, NATS cannot help where pilots are not able to fly into the NATS ADS-B ground receiver coverage area, which currently does not cover the entire UK ( http://fasvig.org/nats-uk-ads-b-3000ft-coverage-area ).

I have proposed to the LAA the idea of using this new PAW capability as the ADS-B verification element in their ADS-B Out MOD procedures. If it is accepted by the LAA I would also like to get the BMAA and BGA onboard for their members that use Mode S ES transponders.

Steve

[The Westmorland Flyer]

Hi Steve,

You read my mind. It would be great if the verification process could be part of the LAA (in my case) system - perhaps a squiggle from the inspector to say that he's seen the appropriate settings via PAW or some such.

I assume, notwithstanding that the NATS trial is "sort of over" the intention is that we can all continue to use our non-certified but validated systems.

Good luck with your negotiations and thanks for all you are doing on our behalf.

[SteveHutt]

The LAA MOD 14 procedure was originally created to support the NATS Southern England ADS-B trial.

However, LAA MOD 14 and also MOD 7 plus Technical Leaflet TL3.03 have now all been updated for permanent installations of ADS-B Out via Mode S ES transponders with an uncertified GPS position source.

[bnmont]

I got this today so working OK with trt800 transponder

[Admin]

Thanks for posting Brian

For everybody elses benefit, this was an early eng build Brian was trying out, in the 20151114 release this appears on the web interface under traffic

Thx
Lee

[SteveHutt]

FYI,

http://fasvig.org/trig-transponder-support-for-uncertified-gps-ads-b-out

[Pete]

Hi Steve and PA forum posters

Thanks for all the info in this thread.
I found today my Trig TT31 saw "GPS Input Activity" but no Position (Lat/Long) yep I'm running on old software V 2.1 (2009) and now sending unit to Trig for "free: upgrade to V3.4 or higher. Very helpful and efficient in the support dept..

Keep up all the good work and keep posting guys, as it really is a font of knowledge on here.
 
Regards
Pete

[ianfallon]

Has anyone tried PilotAware with (or know the NMEA/RS232/SIL/SDA specs for) a Bendix King KT74 transponder ?

[The Westmorland Flyer]

The KT74 is essentially a Trig TT31 in drag but questions remain regarding firmware levels, etc. I am seriously considering the KT74 for my steed and the question regarding SIL/SDA settings is with Harry Mendelssohn's right now. I'll post any response that I get here.

[ianfallon]

Cool - thanks. A friend has one so am interested on his behalf.
I like the number buttons for entering the codes rather than the knob and button approach.

[The Westmorland Flyer]

I too far prefer the number buttons for squawk code entry, having been spoilt for it by my GTX328.

You could always get your friend to hook up a GPS and then use the latest version of PAW to see what the KT74 makes of it. If Mendelssohn's don't get an answer to the question soon (getting information out of BK is difficult) then I was going to suggest to their techy guy Dan that I take a trip up to Edinburgh with my PAW.

[The Westmorland Flyer]

I've just received advice from Mendelssohn that the KT74 has TT31 version 3.4 firmware and that it therefore is compliant with the SIL=SDA=0 requirement. It's not clear whether this applies to all KT74s or just the current stock. I would still recommend a trial with PAW in attendance.

[ianfallon]

Thanks. Any idea if PAW sends the right NMEA messages for it ? I guess that might be one for Lee.

[AlanB]

Thanks. Any idea if PAW sends the right NMEA messages for it ? I guess that might be one for Lee.

Output from the GPS/GLONOS USB Dongle;


$GPRMC,113156.00,A,5126.31393,N,00103.39777,W,0.182,,201115,,,A*6A
$GPVTG,,T,,M,0.182,N,0.337,K,A*2F
$GPGGA,113156.00,5126.31393,N,00103.39777,W,1,08,1.01,59.2,M,46.7,M,,*78
$GPGSA,A,3,01,03,28,23,08,14,17,19,,,,,1.64,1.01,1.30*09
$GPGSV,3,1,09,01,87,355,27,03,57,228,25,08,24,164,28,14,26,048,22*7E
$GPGSV,3,2,09,17,28,311,13,19,66,264,26,22,03,060,31,23,06,182,23*7A
$GPGSV,3,3,09,28,25,271,21*4A
$GPGLL,5126.31393,N,00103.39777,W,113156.00,A,A*7E


Not sure what Lee is passing on as I haven't sniffed that output yet.

[The Westmorland Flyer]

The TT31 installation manual says:

The TT31 GPS input can recognise the following protocols:

• Industry standard “Aviation” protocol
• NMEA 0183 protocol ($GPRMC message)
• FreeFlight and NexNav GPS proprietary protocols
• Garmin proprietary ADS-B protocols
• Trig ADS-B protocol

I think the NMEA 0183 protocol should do it.