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When I transmit there is a signal received by the other radio but no audio. However when I plug in the earphone and mike set, it works on both radios.

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Make sure heys are correct, and retype it again

Posted on Aug 30, 2010

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Mic wireing washington


1 audio, 3 receive, 4 shield, 5 transmit (2 MAY have to be jumped with 4) Audio wire is wrapped with the shield wire, so that eliminates 2 of the 4 wires. put 1 of the 2 remaining wires on pin 5 and plug it in ..... if it starts receiving, you can put the remaining wire on 3........ IF IT KEYS UP WHEN PLUGGED IN..... switch the wire with the other remaining one :-)

Aug 17, 2014 | Radio Communications

Tip

Problems in CB Radio Receive and Modulation


Much of the time complaints about CB receive (RX) and modulation are caused by problems in the antenna system. Make sure there are no shorted or open connections in the coaxial cable or PL-259 (screw-on connectors for coaxial cable, located at the antenna and rear of CB radio) connectors. Use your radio's meter or better still, a Power/SWR meter to check the SWR (Standing Wave Ratio) of the antenna. Try to get that as close as possible to a 1:1 ratio on the meter. A shorted or open antenna can keep the receive audio on your radio at very low levels. Plus, this will harm your transmitter if you continue keying the mike.

Another problem can surface in the radio itself. This will be noticed if you can transmit, but have no "modulation". Modulation can be described as the voice heard above the "carrier" (your transmitted signal). Every CBer knows about the term, modulation. The Truckers will definitely inform you about your modulation quality...lol. This problem can be caused by a defective AMC (Automatic Modulation Control) stage in the receiver circuit. Also, there will be no modulation upon transmit.

One other thing could be causing this lack of receive audio. Defective wiring or switching in the microphone can result in no audio. Additionally, in many radios, a missing mike will not allow receive, because the microphone connection completes the RX (Receive) circuit.

Solutions:
1. Check the antenna system, and fix any problems.
2. Check mike, or substitute another one.
3. Using meter, and/or another radio for listening on same channel, check power and receive.
4. You can probably fix 1, 2 and 3 yourself, or with the aid of a friend.
5. AMC problem in radio (as described above) will require professional service from a CB (Citizens Band) repair facility.

The above suggestions and advice will assist in repairing the majority of the symptoms described.

Regards, Bill

on Sep 18, 2010 | Car Audio & Video

1 Answer

How can I fix a walkie that can not receive sound messages?


Check if it has an earphone jack if it does try plugging an earphone into it If you have audio through the earphone jack then the switch in the earphone jack could be bad or the speaker could be open this would be an easy repair. You might have a broken wire to the speaker. other causes could include cold solder joints bad volume control, bad audio amp, bad transmit receive switch etc

Aug 07, 2014 | Cobra microTALK LI5600-2dx Two Way Radio

1 Answer

How to wire a mic


This might help as I don't have a color code for the mic. Radio pin code; 1 - Audio -2 - Shield - 3 - Receive - 4 - Sw. Wire -
5 - Transmit

MIKE WIRING GUIDE
Found this by Google searching;
5 Pin Mic Plug Model

Pin #1 Audio Output / White
Pin #2 Shield
Pin #3 Receive / Black
Pin #4 Common / Yellow
Pin #5 Transmit / Red

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How to wire a HG M73 mike to a galaxy DX 959


Stock
1- Shield (Ground)
2- Yellow (Audio)
3- Red (Transmit)
4- White (Receive)

Cobra
Stock
1- Audio
2- Transmit
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4- Shield
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Dec 04, 2011 | Galaxy Radios DX-959 40-Channels Base CB...

1 Answer

Will not get good recepiton.


Hi stormnorm157,

Much of the time this is caused by problems in the antenna system. Make sure there are no shorted or open connections in the coax or PL-259 connectors. Use your radio's meter or better still, a Power/SWR meter to check the SWR of the antenna. Try to get that as close as possible to a 1:1 ratio on the meter. A shorted or open antenna can keep the audio receive on your radio at very low levels. Plus, this will harm your transmitter if you continue keying the mike.

Another problem can be in the radio itself. This will be noticed if you can transmit, but have no "Modulation". Modulation can be described as the voice heard above the "Carrier" (your transmitted signal). Every CBer knows about the term, Modulation. The Truckers will definitely inform you about your modulation quality...lol. This problem can be due to a defective AMC (Automatic Modulation Control) stage in the receiver circuit. And, there will be no modulation upon transmit.

One other thing could be causing this lack of receive. Defective wiring or switching in the microphone can result in no audio. Or, in many radios, a missing mike will not allow receive, because the mike connection completes the RX (Receive) circuit.

Solutions:
1. Check the antenna system, and rule that out or fix.
2. Check mike, or substitute another one.
3. Using meter, and or another radio for listening on same channel, check power and receive.
4. You can probably fix 1 and 2 yourself, or with a friend.
5. AMC problem in radio (as described above) will require professional service.

Let me know how this turns out, and inform me if I can offer any more help. Thanks.

Regards, Bill

Sep 18, 2010 | Midland 1001Z 40-Channels Base CB Radio

1 Answer

I have a Cobra 18 wx st. I am not able to transmit anything on it. I have checked the antenna cables and and all external connections. I receive all the wb just fine but the CB gives me nothing. I tried a...


That's usually a defective amc stage that produces RX audio and TX modulation. It's an integrated circuit that will require a tech fixing it. You will have a transmitted carrier with no modulation, and no sound in your speaker. However, make sure you have a good mike plugged in first, and substitute a known good mike to verify it's not the mike. With the WX band working, the above may not apply.

See if you have a carrier...signal going out, but no modulation. Get your Tech to check the mike wiring/circuitry inside the radio, also.

Jul 06, 2010 | Cobra 18 WX ST 40-Channels Base CB Radio

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