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What would cause a radio to key up and send signal but have no transmit or receive audio

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The relay that switches from Tx to receive

Posted on Dec 13, 2016

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Posted on Jan 02, 2017

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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

Kenwood TK-3131 15-channel radio. I purchased a couple of these about a month ago and try worked fine. Turned them on recently and now one doesn't function as it should...it sends a signal when the mic...


By checking initially of your radio,insert your NEW FULLY CHARGE BATTERY,Switch On your radio,select the channel the same as your other working radio,and try it once more,
If you can not heard an alert sounds when you turn on the radio, and pressing any Button/key,probably you'll having a problem on the audio circuits/speaker,etc, if it is working before,
Thank you

Jan 30, 2013 | Radio Communications

2 Answers

GME TX3340 not transmitting


You may have a bad microphone, not uncommon problem.

Apr 18, 2012 | Computers & Internet

1 Answer

Cb is recieving but not trnsmiting


Ah! these and the cobra 2000 had the same board and same problems--

Some will have no transmit audio (check or sub to make sure microphone not the problem) and others no receive audio.

If circuit problem both are caused by a filter cap that opens.

Usually this occurs when radio has not been used for a long period of time.

If you have a schematic for the radio (mine are all out of reach) you will find in the audio circuit a cap (I think it is 220 uf at 10 volts) right near where the volume is controlled that is bad.

The no transmit audio problem is another cap in the mic circuit.

I hope this helps you as it is likely your problem--note if the audio output IC was bad no receive or transmit audio.

shoot me a question by using the make comment if you need further help.

73's

Mar 23, 2012 | Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

148 gtl receive issues


The problem is in the audio output chip usually bolted to the inner chassis. Sometimes the chip developes a hairline crack, replacement recommended.

Mar 14, 2012 | Cobra 148 GTL 120-Channels Base CB Radio

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

2000 neon check engine light is on


P1685 Skim Invalid Key.

The Sentry Key Immobilizer Module contains a Radio Frequency (RF) transceiver and a microprocessor. The SKIM transmits RF signals to, and receives RF signals from the Sentry Key transponder through a tuned antenna ring integral to the SKIM housing. When the ignition switch is turned to the On position, the SKIM transmits an RF signal to the transponder in the ignition key. The SKIM then waits for an RF signal response from the transponder. If the response received identifies the key as valid, the SKIM sends a valid key message to the PCM over the PCI data bus. If the response received identifies the key as invalid, or if no response is received from the key transponder, the SKIM sends an invalid key message to the PCM. The PCM will enable or disable engine operation based upon the status of the SKIM messages.

you can look it up here:
http://www.engine-light-help.com/check-engine-light-domestic.html

Sep 13, 2009 | 2001 Plymouth Neon

1 Answer

Staying keyed up after button release


I have never seen this problem before, check if the VOX is activated, this could cause to transmit the radio, but the voice must be transmited. check if the Accesory connector is not dirty, clogged or damaged

Feb 08, 2007 | Motorola Talkabout T5720 (7 Channels)...

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