Chris Engler
Active Member
Scratching my head over this one ....I have a GTN 650 in an RV-8 and for the past 20 hours or so I've noticed a loss of GPS satellite coverage at certain times....most often on the ground an KFRG where I fly into weekly. The nav/com has been rock solid for 380 hours TT. At first I thought it was intermittent and would occasionally loss of coverage while enroute. Bought a new antenna and it made no difference.
After doing some research, I noted that some folks were having similar trouble while transmitting on certain frequencies (most notably around 121.5).
The other day I had the satellite tracking screen cued up while my active frequency was 122.8 (lots of satellites with a strong signal) and had 121.5 loaded in "standby" and as soon as I switched 121.5 to active it completed killed all satellite tracking and I lost navigation. I repeated the test several times with the same results. I then tried a few frequencies close to 121.5 (including KFRG ground at 121.6) and sure enough, all sat coverage was lost. once I got above 122.0, I could maintain sat coverage but the signals were clearly diminished the closer I got to 121.5
The REALLY strange part is I don't need to transmit on any of the trouble frequencies....simply load them into the "active" window.
Any similar experiences out there and/or suggestions for a fix?
Thanks,
Chris
After doing some research, I noted that some folks were having similar trouble while transmitting on certain frequencies (most notably around 121.5).
The other day I had the satellite tracking screen cued up while my active frequency was 122.8 (lots of satellites with a strong signal) and had 121.5 loaded in "standby" and as soon as I switched 121.5 to active it completed killed all satellite tracking and I lost navigation. I repeated the test several times with the same results. I then tried a few frequencies close to 121.5 (including KFRG ground at 121.6) and sure enough, all sat coverage was lost. once I got above 122.0, I could maintain sat coverage but the signals were clearly diminished the closer I got to 121.5
The REALLY strange part is I don't need to transmit on any of the trouble frequencies....simply load them into the "active" window.
Any similar experiences out there and/or suggestions for a fix?
Thanks,
Chris