UnPossible
Well Known Member
Hey - I have been trying to trouble shoot an issue I am having with my Garmin COM radios. FYI - I have a 650 as COM1, a GTR-20 as COM2 and a GMA-245 Audio panel controlling everything.
I have been having an intermittent issue with noise when I hold the push to talk. Digging a little deeper, I noticed that the RX indicator for COM 2 was coming on with the noise. What appears to be happening is that the COM2 is picking up when COM1 is transmitting and creating some sort of feedback noise. This is happening when COM2 is tuned to within 2MHz of COM 1 (i.e. if COM1 is on 122.0 and COM2 is on 123.0 I hear the noise. if COM1 is on 122.0 and COM2 is on 127.0, no noise.) If I shut down COM2 on the audio panel, no noise either.
Logically it seems like I am getting some sort of bleed over into COM2 when COM1 transmits. Both my COM antennas are on the belly of my RV-10, under the rear seats (which I believe is a common location for RV-10). The RG-400 antenna cabling runs up different sides of the fuselage (i.e. COM1 runs along the left side and COM2 runs along the right).
I'll call Stein (they built harness) and Garmin on Monday morning, but thought I'd check to see if anyone else has run across a similar issue, or have any suggestions on how to fix this issue.
Thanks,
Jason
I have been having an intermittent issue with noise when I hold the push to talk. Digging a little deeper, I noticed that the RX indicator for COM 2 was coming on with the noise. What appears to be happening is that the COM2 is picking up when COM1 is transmitting and creating some sort of feedback noise. This is happening when COM2 is tuned to within 2MHz of COM 1 (i.e. if COM1 is on 122.0 and COM2 is on 123.0 I hear the noise. if COM1 is on 122.0 and COM2 is on 127.0, no noise.) If I shut down COM2 on the audio panel, no noise either.
Logically it seems like I am getting some sort of bleed over into COM2 when COM1 transmits. Both my COM antennas are on the belly of my RV-10, under the rear seats (which I believe is a common location for RV-10). The RG-400 antenna cabling runs up different sides of the fuselage (i.e. COM1 runs along the left side and COM2 runs along the right).
I'll call Stein (they built harness) and Garmin on Monday morning, but thought I'd check to see if anyone else has run across a similar issue, or have any suggestions on how to fix this issue.
Thanks,
Jason