On 1/9/14 7:53 PM, J. L. Trantham wrote: > I have had loss of GPS position on a 'hand-held' unit (Garmin GPSMAP 396) > when flying into PNS. When I switch to tower frequency (119.9 MHz) the unit > loses its position. I think it is related to some 'spur' related to the #1 > Nav/Com (King KY197) being tuned to that frequency. If I replace the unit's > GPS antenna with the 'remote' antenna, secured to the windshield, all the > problems go away. > > I think it is a 'spur' of the appropriate magnitude when the 'portable' > antenna is still installed. Before a panel-mount GPS in an airplane may be used for IFR (instrument) flight it must be tested with the comm radios set to a number of harmonically-related frequencies to ensure there is no interference with the GPS signal and then signed off.
So, yes, it is very likely a harmonic of one of your comm radios was jamming the GPS. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
