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Cobra 21xlr
- Thread starter brians306
- Start date
AB5ID
Member
After you key the mic sound comes on?
Yes it makes noise. The S meter doesn't move tho.
KANE4109
Member
Just on the surface.... if the SPEAKER makes noise when you key the mic.....
Either something is wrong with the mic or it is not wired for the radio.
If both mics are "wired for and working on" another radio... then that wiring might not be right for the Cobra 21XLR
I say this because.... in a normal working case... the RCV wire in the mic is grounding the speaker so that it WILL make sound in receive...BUT when you key up... the speaker ground gets lifted so that it does NOT make sound in transmit.
It sounds like yours is grounding the speaker when you press the button.
In many brands of radios.... they redefine the microphone pinouts and seemingly reverse the functions. As in.... the RCV and XMT pins are swapped.
I would spend a little time with that mic.... if you have a meter/DMM of some kind....
I show correct wiring for a Cobra 21XLR to be....
Pin 1 - GND
Pin 2 - MIC AUDIO
Pin 3 - XMT
Pin 4 - RCV
if you put one lead of your meter in pin 1, put the meter in continuity, and touch the other lead in pin 4 it should MAKE ..UNTIL you key up then stop.
When you key up..... pin 1 should MAKE to pin 3 WHEN you key up but not UNTIL you key up.
If that isn't working right... that could explain what you see.
Sadly..... "same connector" doesn't mean "same wiring".
Either something is wrong with the mic or it is not wired for the radio.
If both mics are "wired for and working on" another radio... then that wiring might not be right for the Cobra 21XLR
I say this because.... in a normal working case... the RCV wire in the mic is grounding the speaker so that it WILL make sound in receive...BUT when you key up... the speaker ground gets lifted so that it does NOT make sound in transmit.
It sounds like yours is grounding the speaker when you press the button.
In many brands of radios.... they redefine the microphone pinouts and seemingly reverse the functions. As in.... the RCV and XMT pins are swapped.
I would spend a little time with that mic.... if you have a meter/DMM of some kind....
I show correct wiring for a Cobra 21XLR to be....
Pin 1 - GND
Pin 2 - MIC AUDIO
Pin 3 - XMT
Pin 4 - RCV
if you put one lead of your meter in pin 1, put the meter in continuity, and touch the other lead in pin 4 it should MAKE ..UNTIL you key up then stop.
When you key up..... pin 1 should MAKE to pin 3 WHEN you key up but not UNTIL you key up.
If that isn't working right... that could explain what you see.
Sadly..... "same connector" doesn't mean "same wiring".
Thanks I will give it a look.
AB5ID
Member
Apologies for not following up earlier. Have you connected the CB to an antenna? If so, can you observe the S meter moving, indicating that it is receiving signals? If signals are being received, it's possible that the speaker isn't properly grounded, which loops through the microphone switch as previously mentioned.
