jrussl
BENEFACTOR
Madison, WI
I have recently been having issues with my radio volume. The radio is a Garmin SL40 that was installed in my Supercub in 2006 and it is connected through a NAT AA80-001 intercom unit.
Upon turning on the avionics at the beginning of a flight, more often than not the radio volume is extremely loud, even when the volume knob on the SL40 is turned fully counterclockwise. After a few or several minutes, the volume returns more to normal, which presents a new problem. Now I can't hear any of the radio reception as the volume is turned all the way down. The volume "pot" does not appear to be noisy when I turn it such that it would indicate it's dirty. It adjusts the volume somewhat as expected, just in two different ranges.
Troubleshooting I have done so far.......
Pulled the SL40 out and re-racked it
Pulled the NAT intercom circuit breaker during one of the high volume episodes. The volume drops down but I think this is related to some intercom gain being added to the radio volume. I suspect I don't have the Rx pot on the NAT adjusted correctly.
Anyone familiar with an issue like this? I am pretty sure it's my SL40 acting up and not the Nat Intercom.
Thanks in advance
Jeff
Upon turning on the avionics at the beginning of a flight, more often than not the radio volume is extremely loud, even when the volume knob on the SL40 is turned fully counterclockwise. After a few or several minutes, the volume returns more to normal, which presents a new problem. Now I can't hear any of the radio reception as the volume is turned all the way down. The volume "pot" does not appear to be noisy when I turn it such that it would indicate it's dirty. It adjusts the volume somewhat as expected, just in two different ranges.
Troubleshooting I have done so far.......
Pulled the SL40 out and re-racked it
Pulled the NAT intercom circuit breaker during one of the high volume episodes. The volume drops down but I think this is related to some intercom gain being added to the radio volume. I suspect I don't have the Rx pot on the NAT adjusted correctly.
Anyone familiar with an issue like this? I am pretty sure it's my SL40 acting up and not the Nat Intercom.
Thanks in advance
Jeff