Mic wiring problems.

If it "keys up" without a mic plugged in, try plugging the mic into the radio and see if it stops. Some radios require the mic to be plugged into it to operate properly. If it is keyed up with the mic plugged into it, try unplugging the mic and see if it stops. If it does stop when you unplug the mic, either the switch in the mic is stuck/went bad or there is a wire shorted in the mic cord to radio plug. Make sure pins 3 and 4 on the mic plug are not shorted. A continuity meter will tell you. If the mic is keyed, pins 3 and 4 will show a short, if the mic is not keyed, pins 3 and 4 should not show a short. If the mic is functioning normally but the radio is still keyed up then there is something in the radio that is shorted.

Hi there I had similar problems myself and the only thing I can think of is that there is a break in the wiring to the mic capsule or that the coil of the mic capsule is open. This is when a dynamic capsule is used. If you have a condenser type then check if there are no dry joints on the capsule itself or a resistor faulty. The amplifying FET is inside and it cannot be repaired. If it is a condenser mic, make sure you have a DC supply from the TX or whatever it is connected to. Does it have a silver button type battery and is it in good condition?

good luck . if you haven't wired it yet you may have to wire it by trial and error . I have one with no mic and I've been trying on and off for several years to wire one up . Not that its taken me that long ,I get the urge an I break out the radio and I work on the mic until I get frustrated then quit.

• The Galaxy desk mic (power mic) is already wired four pin and the Cobra 200 is a 4 pin already as well. So unless someone has messed with them the mic will plug right up to the radio as is.

• But if someone has repined the mic then follow the pinout I listed below to get it rewired for the Cobra 200

1. Pin #1 on mic connector - Black wire.
2. Pin #2 on mic connector - White wire.
3. Pin #3 on the mic connector - Blue wire.
4. Pin #4 on the mic connector - Red wire.

• If you look on the end of the mic connector it will have the imprint of the number for each pin on the mic.

• If you have any comments please feel free to leave them here.
• Hope this helps and thank you for using FixYa.

Regards, Tony

Hi,my name is John. Welcome to FixYa. I,am not to sure, but as I remember this is the same wiring as the Cobra stock mike. #1- shield, #2- white, #3- red, #4- black. Thanks for choosing FixYa...good luck....John

Try the stock mic from cobra, the regular 4 pin mic, its a great mic..... enjoy.... hope this helps....

This is a classic indication of a lost shield or ground connection in the mic circuitry. Double check these connections for good contact in the mic *and* the plug at the other end of the cable.

Check the grounding and SWR or "match"of the antenna system, too. A poor SWR (greater than 1.5:1 or 2.0:1) can cause the reflection of RF back to the radio. Modifications can increase sensitivity of the mic to this unwanted RF.

TRY
1=sh&bk
2=red
3=white
4=blue

maybe this will help ?

try http://www.cbtricks.com/
they have mic wireing diagrams

Hello Darren, Yes it sounds like the mic is wired bass ackwards,,! A cobra 25 mic wiring is
PIN #1- Shield or ground wire
PIN#2- Audio or Transmit modulation
PIN #3- Transmit or Dead Key
PIN #4- Receive Audio.
When your keying the mic, the RX wires are being connected to make the RX work,,,
*** Let me know how you get along with it. Either buy a new mic wired for your radio or you or someone comfortable with soldering needs to resolder the correct wires back on the mic plug,,,Like I said, let me know and have a great day,, Mechanic is back quiet!