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Why does the meter lights dim when you transmit

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Need more info<
Is radio running on power supply in home
or in vehicle?

Posted on Jan 08, 2013

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Posted on Jan 02, 2017

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My connex cx3300hp wont transmit


You need external watt meter& SWR meter..Change antenna..Is the radio meter keying 3/4 way up to 4 watts?(if not then its not Tx'ng)It could be 10.240 mhz crystal or IF pots(need Frequency counter) Or take it to professional Cb repairmen...

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No transmit on 148gtl


First is check to see if SSB transmits or not==if it does the AM regulator on side wall of radio is bad.

Second with a meter and no power on--test the driver and final for shorts or open.

If one is bad replace both.

let me know what you find.

Apr 29, 2012 | Cobra 148 GTL 120-Channels Base CB Radio

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I can only hear the others. When I talk they can't hear and my red anntenna keeps coming on when I push button to talk.


Assuming the antenna is mounted and grounded correctly,when you try to transmit/talk does your meter needle move to the right with your voice,if it doesn't make sure meter knob is set to receive/transmit or mod[modulate] does it move to right now,if not make sure the mic gain knob is turned up or if it is a power mic,is it turned up&have a fresh battery.The antenna light could mean high swr readings which you will have to adjust by tuning the antenna with the radio meter or external meter,you can search swr adjustment on your computer if unfamiliar..some antenna warning lights are factory set too sensitive but most times are telling you there is a problem.If all is set&tuned properly and you still can't get a local signal to respond, your radios transmit finals could be blown,which you'll need a qualified radio tech to determine..Good luck& 73's

Aug 13, 2011 | Cobra 29 LTD CB Radio

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Lights are dimming, gauges are zeroing out while i'm driving. Could this be my alternator? Because car has new battery and starter.


If your battery is charge indicator light does not come on and battery is holding charge after a couple days of driving it is unlikely your alternator is faulty.
If the lights are dimming on youe meter cluster only, it could be a bad connector to the meter cluster.
If your head light are dimming it could be a bad battery connection or the alternator.

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How do i get expanded freqs on my ft1802 yaesu tranceiver


The FT-1802 is a 50 watt 2 meter FM transceiver. It can transmit anywhere between 144 - 148 Mhz (the FM portion) of the 2 meter ham band. It can receive anywhere between 136 - 174 Mhz without any modifications. There is a modification to enable transmit "out of band" below:

http://www.ham.dmz.ro/yaesu/ft-1802-extended-transmit-modification.php

There are few details about the results of this mod - typically these provide for transmitting on frequencies outside (above, below or both) of the 2 meter ham band. Transmitting outside of the ham band without a proper license for the frequencies in the U.S. is a violation of FCC rules.

Sep 08, 2009 | Yaesu Radio Communications

1 Answer

Cobra 29 ltd classic cb not transmitting


Check the ground. Make sure its grounded well on bare metal. To see if the ground is bad, or not making good connection, disconnect the antenna and turn it on. if it does not power up, that means your ground is bad, and it was grounding only through the antenna.

Make sure not to key up with out the antenna connected.

Dec 24, 2008 | Cobra 29 LTD CB Radio

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Cobra 200gtl High Power Transmit problem??


Depending on the type of power supply, radio frequency (RF) energy from the transmitter may be 'fooling" it into thinking that you're overloading it. Check to see if there's any discernible dimming of the meter lamp when this problem occurs, if so, the supply is the culprit.

Otherwise, its probable that the final amplifier transistors are overheating, either they are 'leaky' or not properly attached to the heat sink.

Jun 23, 2008 | Cobra 200 GTL DX 4-Channels Base CB Radio

1 Answer

Keys up and everything dims and does not transmit.


Moving the volume/on/off knob to make the radio work again is interesting and a good clue. On most CB's, the pot is probably soldered directly to the printed ciruit board.

It's possible that there is a bad solder joint to the power connections on the pot that turn the radio on & off. If the solder joint is bad, it can still make a connection but the connection will have added resistance in line. The on/off switch can be bad too.
Switches arc each time they are used and over time, the contacts become pitted and make poor connection.

I had a stereo receiver where the tuner lights flickered and there was electrical noise in the receiver. It turned out to be a bad on/off switch.

This resistance may be low enough not to affect the radio when in the receive mode but when you transmit and draw more current that resistance will be noticable during transmit.

The fact that you rotate or move the volume/on/off knob and the radio starts working again, tells me that there may be a bad connection in the radio.

A cheap thing you can try is spraying some electrical contact cleaner into the pot and rotate the pot back & forth several times and turn the switch on & off several times to clean it.

Please let me know if I can be of further assistance to you.

Good luck!

- Jim

Feb 08, 2008 | Cobra 148 GTL 120-Channels Base CB Radio

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