I have a low-band Maratrac programmed for 6 meters (mobile install) that when I transmit I get a bunch of nasty loud feedback from the speaker. I tried transmitting on a couple different simplex frequencies and moved the speaker around inside the car but got the same result. I verified no loose connections between the speaker wire and control head. I do not receive this feedback when I transmit using my high band VHF Maratrac, keeping all things the same other than the radio box. My antenna (an MFJ dual band 2m/6m) SWR was close to 1:1 on both bands.
Needless to say I don't want to use the lowband radio for transmitting with this kind of nasty feedback since something is wrong. Unfortunately it's not much good for receive only since 6 meter FM is pretty much dead in my area. Has anybody encountered this issue or have any troubleshooting ideas? The radio is obviously pretty old but it worked OK the last time I had it installed with all the same hardware last spring. I presume it can't be the speaker since it works fine on the high band radio.
Needless to say I don't want to use the lowband radio for transmitting with this kind of nasty feedback since something is wrong. Unfortunately it's not much good for receive only since 6 meter FM is pretty much dead in my area. Has anybody encountered this issue or have any troubleshooting ideas? The radio is obviously pretty old but it worked OK the last time I had it installed with all the same hardware last spring. I presume it can't be the speaker since it works fine on the high band radio.
