I am trying to locate a common fault on a garmin SL40 Transceiver/s where we occasionally get feedback on transmit.
I have tested the swr and found that at 118mhz it was 1.1 at 127.65 it was 5+ at 136 is was 1.2. These figures cause me some confusion. Can you shed any light on it for me? When the radio transmits at 118 or 136 we have no problems. When we are mid range the feed back occurs. Im guessing there is a link to the swr and the feed back. Is there a way I can cause a swr change in the mid range without modifying the antenna in a major way.
I have tried changing all settings in the Garmin. When I replace the headsets with cheapies (NOT ANR) the problems appears to disappear. I have had this fault on two different types of aircraft and several Pioneers.
Any advice on these questions would be greatly appreciated.
Yours Sincerely,
Jim Tatlock
I have tested the swr and found that at 118mhz it was 1.1 at 127.65 it was 5+ at 136 is was 1.2. These figures cause me some confusion. Can you shed any light on it for me? When the radio transmits at 118 or 136 we have no problems. When we are mid range the feed back occurs. Im guessing there is a link to the swr and the feed back. Is there a way I can cause a swr change in the mid range without modifying the antenna in a major way.
I have tried changing all settings in the Garmin. When I replace the headsets with cheapies (NOT ANR) the problems appears to disappear. I have had this fault on two different types of aircraft and several Pioneers.
Any advice on these questions would be greatly appreciated.
Yours Sincerely,
Jim Tatlock