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would need to know the mic wire code you going to use. but half moon cut out at top as you look at it is top left 1-4 next row left side 2-3. 1 is cable/ unshield (common). 2 is MOD 3 is TX 4is RX... 1 is wire with no cover 2 is with cover rapped round wire RX is received TX is transmit, hope this helps. newer mic have different code wires so check with meter, red green and blue and shield is on some of the new wiring.
TX = Transmit. RX = Receive. Does your needle move when you key the mic? Does it modulate when you talk in the mic? Do you have an inline watt/SWR meter inline? What kind of a set up do you have? Mobile? Base? Get back to me if you want further help.
TX means transmit. There are 3 settings for the meter. The top one is to measure your TX/RX that's transmit and receive. CAL is to calibrate the meter to check your SWR.
Reasons your needle may not be moving much when you key while on TX/RX. The dynamic is probably all the way down. That is your mic gain. If you turn that up when you talk the needle will swing more. If the radio is stock and not modded, you can turn this all the way up and leave it.
Also there could be something wrong with the mic. If people can hear you then its not the mic.
If people can hear you fine when you transmit, it may just be a bad meter. Not a big problem, you will just need an external meter to make sure you swr is not high.this is important because if it is over 1.5 you run the risk of blowing the final transistor.
What happens if you "key up" and "let off" and the transmitter "hangs", you remove the microphone plug from the Cobra ? Will it still be transmitting or will it stop ? If it stops, the problem is in the microphone with a "hanging" switch which you can easily clean or replace. Iif it keeps transmitting while the mike is disconnected, there is a problem with the Rx/Tx switching circuit. This needs further investigation by use of a circuit diagram.
For the money,the Cobra 29 nw/st is just as good if not better than a Galaxy. Cobra is more durable by far. I have had 3 of these cobra's in the last 30 years. Only had to replace the last one because the tractor got hit by lightning.
Sure would not pay big money for a name.