Astatic D104 Minuteman 1

Sounds like it's not wired for your radio. What kind of radio do you have? And what kind of radio (do you know) was the mic wired for?

 

I'm not familiar with the Iriquois mic pattern.

However, your PC 68 LTW mic pattern is as follows:

1 Ground
2. Audio
3. TX
4. RX

Typically in an aftermarket mic, black is RX, red is TX, white is audio, and bare wire is ground. Not always but usually. CB tricks may have something for that mic.

The PC68LTW and the Cobra 29 use the same mic pattern.

Anything wrong with the 68 LTW? I like those radios....

 

Does the radio have talk back added? If so try turning it off.

 

The problem is it isn't wired up right for the Uniden or the Cobra.

There is 6 wires or should be with the MM1, there is a blue wire and a shield soldered together on the mic plug for all these radios you have.

There is a yellow wire too but that is ignored.

The Iroquois should be wired this way -

Number one terminal - white
Number two terminal - shield and blue
Number three terminal - black
Number four terminal - red


Uniden/Cobra should be wired this way -

Number one terminal - shield and blue
Number two terminal - white
Number three terminal - red
Number four terminal - black

The reason for the squealing is that the switching done internally isn't turning off the speaker and is causing the audio to internally feedback into the transmit.

OH and be careful when you solder the wires on, you can melt the plug.