ADS-B tranmitted via a Mode S TX for the NATS Trial

[bryannortje]

It will no doubt work, and be accurate enough, but long term reliability could be an issue - how will you know if it stops or throws out some odd data?

For such a "fit and forget" type of installation I would err on the side of caution

I agree totally with this type of GPS one could be flying blind not knowing if its gone ape or not. Using the GPS from the PAWS or from SD would be best as that tells you pretty promptly if there is GPS feed data issues.....

I need to check whether the FUNKE will alert you with a missing icon if the GPS feed goes down.

[SteveHutt]

This thread started out asking about the NATS Trial. As far as I am aware virtually all those that originally signed up for the trial were LAA PtF a/c.

The LAA has now updated the MOD forms to remove reference to the NATS trial (bar the NATS email address, required for ADS-B Out setup flight test verification purposes). Just follow the process described in LAA TL3.03 and MOD 14 or MOD 7, as applicable. The LAA approvals, once granted, are now permanent.

For LAA PtF a/c you can simply do the mod on a permanent basis, but you do need to fly in southern England to gain verification as part of your LAA MOD 7 or 14 application that your ADS-B transmissions are good (the equivalent of the process you had to go through to verify your transponder installation).

See here:

http://fasvig.org/laa-opens-up-uncertified-gps-ads-b-out

I have heard no news yet that there is ADS-B ground receiver coverage outside the south of England but even that southern England coverage does not give radar controllers access your ADS-B data on their screen. The data currently just ends up in a NATS computer database, hence the need to email NATS to verify your ADS-B Out function (rather than do it over the radio as is the case with verifying standard transponder function).

If you are installing a new Mode S ES transponder in a LAA aircraft and enabling ADS-B Out at the same time then you can do everything on the LAA MOD 7 form.

See these links:

http://www.lightaircraftassociation.co.uk/engineering/standardforms.html

And TL3.03

http://www.lightaircraftassociation.co.uk/engineering/technical_leaflets.html

Steve

[bendavis]

Found this Specification sheet.

http://www.wintec-gps.de/download/wintec_wgm-302_manual.pdf

Usb which through a USB/PS2 connector provides RS232, see end of above.

Not sure that it is a reliable source for the transponder as Im not sure of the workings of the USB/PS2 connector - thought they were just straight wired through of the USB in/out pins but could be wrong.

My TT21 I drive with a standard RS232 input from an AVMap V panel mounted which has the capability.

Another option would be the Garmin series, 795, 695 196 etc. Not sure the Aero can drive anything though not familiar enough for this to be definite.

So it looks like the USB version creates a virtual com port, which is the norm really.  As it requires a driver then it *may* not be plug and play on the Pi, depends on how they create the VCP.  I'd forget the PS/2 version, as you would need to inject 5v power into the signal path between the GPS and Transponder if you wanted to plug it into the DB9 port on a transponder.

There are two different versions, WGM-302 U for USB and WGM-302P for the PS/2 version.

U-Blox5 started in 2008 and doesn't appear to be around any more?

Anything like this, the devil is in the detail.

I've found this one too, think it's also workable with a Trig

http://www.byonics.com/tinytrak/gps.php

Ben