No receive cobra 29 ltd classic

I believe to wire a Sadelta M3 microphone to a Cobra 29 LTD Classic CB radio:

The Sadelta M3 microphone has four wires: white, shield (bare wire), red, and black. The Cobra 29 LTD Classic CB radio's microphone jack also has four pins: Pin 1 (Audio), Pin 2 (Ground), Pin 3 (Transmit), and Pin 4 (Receive).

To wire the Sadelta M3 to the Cobra 29 LTD Classic, you need to connect each wire from the microphone to its corresponding pin on the microphone jack. The white wire carries the audio signal from the microphone's element to the radio, the shield wire provides a ground connection, the red wire activates the radio's transmit function when the microphone is keyed, and the black wire is used for receive audio.
Here are the specific steps to follow:

1. Cut off the existing microphone plug on the Sadelta M3 microphone cord.
2. Strip about 1/4 inch of insulation from each of the four wires in the Sadelta M3 microphone cord.
3. Connect the wires to the pins on the microphone jack as follows:

• White wire to Pin 1 (Audio)
• Shield (bare wire) to Pin 2 (Ground)
• Red wire to Pin 3 (Transmit)
• Black wire to Pin 4 (Receive)

1. Solder each wire to its corresponding pin on the microphone jack. You may want to use a multimeter to verify that each connection is solid and that there are no shorts or open circuits.
2. Once you have soldered all the wires, test the microphone by speaking into it and checking that the radio's TX meter moves as you speak. Also, check that you can hear audio through the radio's speaker when receiving signals.
3. If the microphone is working correctly, use heat shrink tubing or electrical tape to cover the soldered connections and provide strain relief for the wires.

Note that some microphones, including the Sadelta M3, may have additional features such as a built-in amplifier or power supply that require additional wiring.

PDF]EIi?tr,iitts - American Radio History

www.americanradiohistory.com/Archive-Radio.../90s/.../EN-1993-11.pdf
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Cobra 29 LTD Classic CB Radio - YouTube? 5:42https://www.youtube.com/watch?v=vJle8vlsWLcAug 20, 2013 - Uploaded by C B WorldIn this product review we look at the Cobra 29 LTD Classic CB radio and ... Just like in the manual. most channels are below 3. a few are not.Cobra 29 LTD Classic Troubleshooting - iFixithttps://www.ifixit.com/.../Cobra_29_LTD_Classic_TroubleshootingiFixitCobra 29 LTD Classic is not transmitting or receiving. The Antenna is not tuned correctly; The Radio is not in CB mode; The Radio is on the wrong channel; The ...Marine Radios ' Cobra Electronics Corporation

Check that your mic gain or dynamike knob is turn clockwise if it is full counter clockwise you will have no modulation with your tx power.
I would like to help but one sentence describing your problem can lead to a vague solution.
Be aware that not all 4 pin mikes are wired the same.
Stock
1- Shield
2- Audio
3- Transmit
4- Receive

• Pin 1 = Shield = Shield
• Pin 2 = White = Audio
• Pin 3 = Red = Transmit
• Pin 4 = Blue = Receive

Regards, Tony

did you change IC4=TA7222AP ?
check input ic4 pin1 is it supply voltage?=12vdc.
check C48 couple cap,also check C39 replace
with a 25 watt and C42 also C45.
check R130 1.1 ohm. also R121 180 ohm.
if pin 1 on ic4 is low volt or missing,check TR23
and D22,C119
maybe this will help some

It's the mic or radio like you said try this
unplug the mic the RX (receive) will stop
working there are 4 pins take a small screwdriver short one pin at a time to the
side of the plug an watch the meter if you
find one that makes the meter jump over
then your mic is bad.last if that don't work
then short 2 pins together and not to the side
of the plug. there is nothing that will hurt you
or the radio.hope this helps.I have worked
with radios and outher electronics for over
22 years. Good Luck

Sounds like the PLL circuit....... no channel synthesizer will kill the transmit and receive...... bad crystal or IC could be at fault or if someone has attempted to add more channels could also be cause.

ant. light should only come on if you have a high vswr a bad thing did you check that cb/pa switch is set to cb check your swr this is not a good place to mount ant. as it is close to metal of back of cab

As I understand from a tech friend of mine, most truck beds are not grounded well enough. Perhaps you could borrow/purchase a magnet mount antenna and locate it on the roof, for testing. Then you would have it narrowed down to the location.

Hello MyPete,

You have some form of short circuit in your CB, most likley I would suspect the Power supply or the RF Power Output Amplifier. Here are some basic instruction on how to tell wher the smoke is coming from.

1) disconnect and remove your CB from your vehicle and put it on a workbench
2) remove the cover from your CB and expose the circuit board to view
3) connect your CB to an external 12 volt power source and antenna or a dummy load
4) power up the CB and determine where the smoke is coming from then turn off the power supply to the CB
5) At this point you will need a schematic of your CB (get one from www.servicemanuals.com)
6) find the point on the schematic that relates to the point where the smoke is coming from
7) using a ohmmeter determine which component and or components are shorted
8) replace the shorted and or malfunctioning components.
9) test the system (power on, transmit and receive)
10) close the unit back up
11) reinstall into vehicle
12) run tests again.


This should help

Thank you
Shutle832