[Icom] 775-DSP with HM-I mike

[Dan R]

Mike, I have used the wall wart, an SEC 1223 switcher power supply and an
Alinco DM-1350 HD supply all with the same results. Have shut down all cable
boxes, all lights and every motor driven appliance in the house and the hum
is still there. We think it is internal to the MFJ TNC but have not been
able to get a scope on it. Good suggestion though as I found an older Icom
wall wart I had been using on a hand held that was noisy.
73
    Dan R