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Why does the meter lights dim when you talk to transmit

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Power draw.What kind of radio?

Posted on Nov 04, 2013

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1 Answer

Why does the meter lights dim when you transmit


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

Jan 06, 2013 | Radio Communications

1 Answer

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

1 Answer

My cb will turn on but i cannot talk to anyone, im getting nothing. Why?


Does it Transmit?? Does meter show transmit?? Can you hear?? If its hearing an transmit gone..it could be Microphone, or speaker, or other more serious problems inside circuit. Change mics and hook up Ext Spkr. If that does not do it, then radio is gone. Buy new radio instead of repairs.

Apr 09, 2011 | Radio Communications

1 Answer

Indicator light doesnt work and the meter doesnt work.


If your TX (Transmit) meter does not work at all, it might or might not be a faulty press-to-talk switch, or faulty wiring. More often, it's the final amplifier stage that's defective if you don't have a carrier (signal) when you key the mike. That will require a qualified Tech to make those repairs. I'm basing this on my experience as a Communications Technician since my Navy days and CB Dealer since the mid 1970s. Thanks

Aug 25, 2010 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

My meter doesnt move at all, when i transmit i can ne heard sometimes and sometimes not, u think its the mic ?


If your TX (Transmit) meter does not work at all, it might or might not be a faulty press-to-talk switch, or faulty wiring. More often, it's the final amplifier stage that's defective if you don't have a carrier (signal) when you key the mike. That will require a qualified Tech to make those repairs. I'm basing this on my experience as a Communications Technician since my Navy days and CB Dealer since the mid 1970s. Thanks.

Aug 11, 2010 | Cobra 29 WX NW ST 40-Channels Base CB...

3 Answers

The power is on, however, when I use the mic and speak the "needle" doesn't move, I have tried different mics. Also, the sound coming from the radio is also very soft.


When you say the sound coming from the radio is very soft, are you talking about talk back? if so, you want that soft. If you are talking about reception then just get an external speaker.

If the radio is working, and transmitting ok, the meter is not important.

You may want to get an external meter to make sure SWR's are good.

If it is not transmitting at all, there could be a real problem and the radio needs a tech.

Aug 14, 2009 | Uniden Bearcat Pro PC68XL 40-Channels Base...

1 Answer

The marine cb radio turns on but you can't here noboby talking nor can u talk out from the cb


Sound like either an antenna problem, or a mic problem.

The mic on most cb's also serve as transmit/receive switching. A broken wire or bad switch in the mic or cord can cause either or both to fail.

If you have a bad antenna (or cable), you should still hear squelch noise on receive (maybe lower in volume) and be able key the mic and get a transmit light on the unit. Visually inspect the connector, cable and antenna. If need be use an swr meter to prove the antenna system is bad.

Hope that helped...

Geno

Aug 01, 2008 | Audio Players & Recorders

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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