Hi Geoffrey,
Thanks for the feedback.
I'd be very surprised if the USB socket and adaptor on their own, or even with the attached cable, were causing such a big gap in transmission to the front right from where your antenna is positioned, but I suppose when combined with the front strut and front wheel (depending on your height/distance from the ground station(s)), between them all they could be. If so the only viable option is to move your antenna higher up on the windscreen or fit an external one below the pod or rear skirt.
Getting back to your original (and possibly more important issue), however - why we are seeing no ADSB from your Trig TT21 transponder.
You are obviously transmitting P3i from your PAW, which means it definitely has a GPS fix (or it wouldn't transmit).
That means the reason for 'No ADSB' has to be down to one of the following: -
1. Transponder is not not transmitting due to a fault.
But you were tracked on FR24 so that can't be the case - though I suspect the tracking was probably from your Mode-S via MLAT.
I am seeing faint signs of a very weak transmission on your ADSB Vector charts - which is probably the TT21 auto-transmitting its Hex ID.
Both of which show that the transponder IS transmitting.
2. Transponder is not receiving GPS Data from PilotAware.
We have already determined that the PilotAware is producing GPS data, and it's very easy to check if this data is being received by the Transponder (you can do this on the ground).
First power up both PilotAware and the Transponder (set the Transponder to 'ALT').
Next, login to the PilotAware Home Screen and check that it has a GPS fix. If it has, press the 'FN' (Function) Button on the Transponder Control Head Twice. This should bring up the ADS-B position monitor screen - which will display local lat/long co-ordinates on screen if the transponder is receiving GPS position data. If they don't appear, or just show 'dashes', there is a problem with one or more of the following. (Note: it's easiest to check the settings first, before starting to take connectors apart).
3. Fault in USB to RS232 cable or settings.
These are likely to be one or more of: -
(i) Faulty Cable (You are presumably using the recommended FTDI USB to RS232 Serial Cable ?), if so, the only cabling fault can be wrong wires used, or the correct wires but connected to the wrong pins in the Trig 25-way connector. The correct wiring is Black Wire (Ground) connected to Pin 4 and Orange Wire (Data Out - From the PilotAware) connected to Pin 5 (these are on the 13 pin row (the other row has only 12 pins) and if you are at the correct end, Pin 1 will have a connection, then Pins 2 and 3 won't - if they do, you're at the wrong end! The most common mistake I find is the Yellow (Data In) wire connected to pin 5 instead of the Orange one.
(ii) Wrong Setup at the PilotAware End.
This can be one of two errors - either the wrong USB port has been set up, or the wrong Baud Rate has been set. Looking at the USB end of the PAW, with the Ethernet Port to the Left of the USB Ports, the USB ports are numbered from the left, 1 then 3 on the top row, and 2 then 4 on the lower row. If you have the standard Classic setup, the 'spare' port which the USB lead to the transponder will most likely be plugged into will be Top Left, which is Port 1. On the Configure Screen, Port 1 should be set to 'Transponder Trig' and 9600 Baud. If it isn't in Port 1, you must identify and then configure the CORRECT USB Port.
(iii) Wrong Setup in the Transponder.
To get to Setup, Hold in the 'FN' button in while switching the Transponder ON. Once the transponder has turned on, release the 'FN' button. Each further press of the 'FN' button moves the unit to the next setting position in sequence. If you don't need to change the setting, simply press the 'FN' button again to move on to the next option. The critical ones you need to find and check are GPS Input - which should be set to NMEA 0183, and GPS/TIS Line Speed - which must be set to the same as you set in PAW - namely 9600 Baud. Once you have checked or reset these correctly, simply switch the transponder OFF then ON again (back to 'ALT') and re-press 'FN' twice to see if the Position Co-ordinates are now showing. If they are then 'Bingo' you have won the prize.
If it's still not working get back to me.
Best Regards
Peter