Cobra 4 pin HighGear HG M75 CB Radio Power Mic
In searching for a mike for my bitx projects I found the HG M75. It was a coil cord mobile mike with a built in preamp and adjustable gain control. It was available all over the internet for around $20.00 This was perfect for my purpose. The next problem was the connector pinout. After a lot of searching, I found the following:
The next problem was the connector pinout. After a lot of searching, I found the following:
Add a jumper between pins 2 and 4. The PTT line hooks to pin 3 and the audio to pin2. Pin 1 connects to ground.
For a schematic of the mike circuit and a possible modification of it go to: Mike schematic and modification I haven't modified mine and it seems to work satisfactorily.