Stijn: Two batteries, a Li-Po for the video equipment (GPS, recorder, Tx) and a Ni-Mh pack for the receiver and servos.
Jim: On the glider, there is the receiver for the control Tx, it's in the 72 MHz band and does not seem to be causing or receiving interference. There is the Tx for the telemetry which runs on the 900Mhz, but I'm not sure exactly what Fq. There is also a 5Hz GPS module, it has a very short cable, but I took this out of the loop last night and the same issues occurred. The Tx for video has 2 dip switches to toggle between four 900 frequencies, but the manufacturer sets the channel and then seems to glue the dip switches. I think I ruined one by trying to force it to another channel. I don't have the exact frequencies in front of me. It'll take a little time to find.
I do know, that as soon as I turn off the video equipment on the glider, the telemetry receiver picks up the signal again. I am assuming that it is the video Tx that is causing the issue, but I will have to double check. The Tx and video camera have identical power cables and I'm not sure which is which. I will label and check later today. I will also hook up the old telemetry equipment again and see what happens - although I have used both without issue.
Here are a couple of pix from December. Old telemetry that was working with the video.
The old GPS receiver is the red square on top of the wing
I'll dig up the frequencies later. Time for lunch and a bit of work.
Thanks!