Power mic help

[Davy45]

Hello

Im new to the whole world of CB radio's. I recently got a power mic for my rig which is wired the same as Uniden. The problem im having is that its always on Tx until you key the mic.

Obviously this is the wrong way around and not how it should be. My second problem is that the audio from the rigs speaker is dramatically low compared to a normal mic.

Any help would be greatly appreciated!

Cheers
Davy

 

[KEWB-N1EXA]

Its time to break out the Ohm Meter and Soldering Iron to change the wiring of the mic. It can be done through the connector
or getting into the Microphone and changing the switching wires. As for the Audio being low it could be needing to have the
Transmitt/Recieve switch wired correctly. As for the Microphone fresh battery
or you have an impedance issue it could also be wired wrong.
Here is a chart to get you started.
You can Help the Group By stating what kind of CB radio you have too and what Microphone.

Some mics have an internal switch for Relay or Electronic switching.

Peter N1EXA

 

[Davy45]

Its time to break out the Ohm Meter and Soldering Iron to change the wiring of the mic. It can be done through the connector
or getting into the Microphone and changing the switching wires. As for the Audio being low it could be needing to have the
Transmitt/Recieve switch wired correctly. As for the Microphone fresh battery
or you have an impedance issue it could also be wired wrong.
Here is a chart to get you started.
You can Help the Group By stating what kind of CB radio you have too and what Microphone.

Some mics have an internal switch for Relay or Electronic switching.

Peter N1EXA

View attachment 113094

I have all the wiring for the Microphone worked out.

Yellow - Audio
White - RX
Red - TX
Black - ground/Sheild

But when pluged in to the rig its on constant TX until you key the microphone then its on RX. A new battery was put into the microphone so can't be that. I'll open the microphone up and check the wiring inside.

The microphone is a generic one.
Brand is RS and stock number is Stock no.249-980





Cheers for the help!

 

[prcguy]

Try swapping the red and white wires.

I have all the wiring for the Microphone worked out.

Yellow - Audio
White - RX
Red - TX
Black - ground/Sheild

But when pluged in to the rig its on constant TX until you key the microphone then its on RX. A new battery was put into the microphone so can't be that. I'll open the microphone up and check the wiring inside.

The microphone is a generic one.
Brand is RS and stock number is Stock no.249-980





Cheers for the help!

 

[Davy45]

Try swapping the red and white wires.

I tried this method last night and the tx was on all the time even if the mic way keyed in or out. Its a stange one to be honest.

 

[KEWB-N1EXA]

Sounds like the ground is in the wrong position. its forcing the transmit on.
lift the ground and see if the transmit is de activated~
and with an ohm meter find what pin is ground on the radio side and work from that point.
If you look at the chart I sent you the uniden can be wired 2 ways.

 

[Davy45]

Sounds like the ground is in the wrong position. its forcing the transmit on.
lift the ground and see if the transmit is de activated~
and with an ohm meter find what pin is ground on the radio side and work from that point.
If you look at the chart I sent you the uniden can be wired 2 ways.

Hello so I got the mic sorted out thanks to the chart you posted. The only problem I have now is that when it is plugged in to the rig the receive volume is very low I have to max out the volume to hear anything and even then it is extremely low.

 

[prcguy]

I think you need to start from scratch with the radio and find what pin is ground, which can be done with an ohmeter. Then short out the remaining pins to see which is receive and transmit, then while transmitting what remaining pin is the mic audio. Then map out your mic with an ohmeter for ground, TX and RX then the mic audio should have the shield around it. Then wire it up again the right way.

Hello so I got the mic sorted out thanks to the chart you posted. The only problem I have now is that when it is plugged in to the rig the receive volume is very low I have to max out the volume to hear anything and even then it is extremely low.