I posed this question to the NHRC Group with no response. I wonder if someone
here has an answer?
I have a NHRC-3/M2 controller installed in a Mastr II mobile and have
had it in service for several years. It has a high frequency noise or
whine that I can hear and shows about 200 Hz deviation on the service
monitor.
I am wondering if there is a ground strap that can be added either to
the board or to the radio that will reduce this noise. I have the
audio amp disabled so that is not the source of the noise.
I am just returning this controller to service and would like to
reduce or eliminate this whine. Maybe some kind of rebalance of the
audio levels is possible to help?
73 - Jim W5ZIT
