MrNomad
Well Known Member
Just when we thought we were done wiring our RV9A, we noted the Ray Allen aileron and elevator trim LEDs would go bonkers when we pressed PTT on the Garmin SL30 or the ICOM A200 radio. As you'd speak into the mic the LEDs would bounce back and forth.
A 50 ohm dummy load on the antenna stopped the signal from interfering with the LEDs so we knew that RF was the culprit and the radiation was not coming from the radios or antenna lead cables.
We tried installing capacitors across the sensor lines to remedy. No luck. Ferrite cores placed around the sensor lines with three turns yielded no improvement. We also yanked the airplane outside the shop to make sure the signals were not bouncing back from the walls. I was ready to bounce off the walls, but not the signal.
A call to Ray Allen yielded no help.
Finally, my good friend Chet replaced the sensor line wiring with shielded cable. Problem solved.
My thanks to Gil Alexander, Mel and especially Chet.
Barry
Tucson
A 50 ohm dummy load on the antenna stopped the signal from interfering with the LEDs so we knew that RF was the culprit and the radiation was not coming from the radios or antenna lead cables.
We tried installing capacitors across the sensor lines to remedy. No luck. Ferrite cores placed around the sensor lines with three turns yielded no improvement. We also yanked the airplane outside the shop to make sure the signals were not bouncing back from the walls. I was ready to bounce off the walls, but not the signal.
A call to Ray Allen yielded no help.
Finally, my good friend Chet replaced the sensor line wiring with shielded cable. Problem solved.
My thanks to Gil Alexander, Mel and especially Chet.
Barry
Tucson