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Mic may have audio wire broken in cord at mic plug wire solder connection.
Stock 1- Shield 2- Audio 3- Transmit 4- Receive notice the numbers on the black plug after you pull it out of the radio.
If you have talk back in this radio.( you hear your self through the radio when you transmit) then its a good bet that the RX wire in the mic plug has broken off.
The mic switch is responsible for putting the radio into receive mode when you release the key. If the RX wire is broken, the radio will not go into receive.
Normally when this happens you have no receive at all no matter what, but you will have very low sound if you have talk back installed in the radio.
Because of this, if you have talk back in your radio, and the volume is faint even at full blast, its a good bet that its a broken RX wire in the mic cord or plug.
You can attempt to see if the break is at the mic plug. if it is, you can re solder it and it will solve your problem. If you have no clue, then you can just go buy new 4 pin mic.
It has to be on high band d/a to talk on you're 40 basic channels and no you can not run this off a cig. plug it needs to go to the battery. This is an AM radio so it has to be on AM.
Its just RF feed back, that's normal, try to re-route the coax, or just turn the FM down, o try turning your modulation down....hope this was helpful....
if you have a power mic , you might have it turned up to high. next make sure you have a good ground on your antenna. if that is ok and you still have the same problem have the swr checked. this should fix the fm radio noise.
OK I remember a similar problem with a connex radio. It seems the driver's fm radio speakers where picking up some signal even with the fm radio off. Shortening the speaker wires helped some, also make sure you don't have any wire or coax coiled up anywhere. Thats about all I remember, hope this helps. Tp
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