Question about Maxon MCB-40 40-Channels Handheld CB Radio

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Squelch when keying ptt

I have a helmet set up with a ptt on the handle bars. I can hear the chatter okay but when I press the ptt they cannot hear me but get a squelch noise. I am thinking I might have pinched the wires someplace.

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Re: squelch when keying ptt

I would check my ptt wiring making sure the button is set so that when you push it it switches you from RX to TX. If you have a wiring diagram that would be helpful if not are you able to get one? In any event make sure the wires are not misconnected.

Posted on Sep 12, 2007

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1 Answer

I have a cx-366ce cb cannot hear talking what is wrong

Is squelch turned too high that it is blocking too many signals?
Otherwise, it could be a faulty cable on the mic as the PTT button disconnects the speaker on the CB and a broken wire can cause the speaker to be disconnected.

Jun 28, 2014 | Connex Cx-366ce Night Runner 40ch Cb...

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When I turn my cobra 29wxst on, I hear chatter (ppl talking) for a split second then nothing. When i key up, nothing, no swing or anything. However, i get weather. All the basics are covered, coax, ant,...

You've probably already done this, but make sure all the basic settings are correct. CB-PA switch is in CB mode, Squelch is turned to the left, RF Gain is turned to the right, etc. After all that, and you still have nothing, I would try using another microphone. If you have a spare mic or a friend with a spare mic, borrow it. Just make sure its wired the same as yours is. (If it's a cobra 4-pin, it most likely will work.)
Now if that doesn't fix it, then the most likely problem is in the MIC/AUDIO circuit. You'll need someone with experience to replace the necessary parts.
In radio troubleshooting, always start with the basics:
Correct Connections
Proper input Voltage (Power)
Correct Settings (Vol, Sql, RF-G, etc)
Antenna (properly matched)
I hope this helps a little...

Mar 20, 2013 | CB Radios

1 Answer

My Ranger2950 has no sound??

Have a look here for info about the Ranger 2950. This is an Amateur 10 & 12 meter transceiver that enjoy some popularity due to its ability to be modified to work on the 27Mhz Citizens Band.

Make sure the Mode is set to something other than PA. A few of the first things that come to mind is the Volume, Squelch & RF Gain settings. The Volume is straight forward - choose a setting in the middle to begin. Next, set the squelch. Most radios have the squelch open when set fully counter-clockwise. As you move the squelch to this position, sound should be heard from the speaker if a signal is present. As long as there is an antenna connected, the radio should "hear" noise. If you do not hear anything, leave the Squelch fully CCW and try varying the RF Gain fully in one direction. If you still hear nothing, set the Squelch to the fully clock-wise position. Adjust the RF Gain to the opposite direction. At this point, you should have heard something - even if just static hash. If not, the volume control may be dirty. Disconnect power and rotate the volume control back and forth several times to dislodge any dirt on the volume wiper inside the radio, and try again.

Make sure that the Ext Spk jack does not have a plug inserted as it will defeat the internal speaker. Likewise, if using an external speaker, make sure it works.

Good luck!

Nov 19, 2012 | Ranger CB Radios

1 Answer

There is no squelch noise on my cb. It was there and now there is nothing

I think its vr6 in that radio but you have to turn it till you hear noise. did you use a signal generator to set the squelch?

Oct 23, 2012 | Cobra 29 LTD CB Radio

1 Answer

I have a cobra 29 ltd but have trouble maintaining any clear channels. Is there a way to maximize station clarity?

I just saw your message and the problems you have been having, from your description you have managed to get everything sorted out and working. I to have been into cb's for many years and enjoy the challenge tinkering with the system and I congradulate you on a job well done.

Feb 28, 2012 | Cobra 29 LTD CB Radio

1 Answer

I just bought a cobra 29 ltd, i hooked it up and calibrated it the way the manual said but when i turn it on and turn my squelch all the way to the left i barley hear it at all, and i have the volume all...

there may be a very low noise level. If the noise level is low you will hear almost nothing. You need to go on ch 19 and drive near a major interstate.

Key up and say, "Break one nine for a radio check" and a trucker will come back and tell you its working. If you hear him okay, then your radio is working fine.

Some days, background noise is heavier and lighter then others.

Oct 18, 2010 | Cobra 29 LTD CB Radio

1 Answer

I am looking for a PTT set up that is simple and small for #75-822. I need to hook it up inside a fullface helmet

Have you ever thought of "Speech Activated" unit, these can be had, quite cheaply, and allow you hands free usage? Just a thought.

Feb 12, 2010 | Midland 75-822 40-Channels Handheld CB...

1 Answer

Uniden UH-013 squelch

Had an issue with this unit since new. Squelch adjusted too high. Not hearing some signals showing on meter. Solution - find a trim pot labelled "Meter" on the PC board and adjust it like a knobby squelch control. Made a big difference to the number of received stations. Down side is I need to use SQT tight squelch sometimes.

Feb 20, 2009 | CB Radios

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