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Voltage regulator noise on cb radio - Radio Communications

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Buy a noise clipper it should take care of the problem

Posted on Aug 13, 2014

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Posted on Jan 02, 2017

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SOURCE: cb transmit noise

Its just RF feed back, that's normal, try to re-route the coax, or just turn the FM down, o try turning your modulation down....hope this was helpful....

Posted on May 29, 2010

  • 88 Answers

SOURCE: midland cb radio. when i

This is usually caused from a poor ground. Try to reground the radio to a better location and it should fix it.

Posted on Jan 06, 2011

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2 Answers

Cb radio channel display doesn't work no transmit no receive but still powers up.


First lets see why the channel display is not lighting up. This indicates a problem internally with the radio. Is the CB/PA switch in the CB position? If the CB/PA switch is in the CB position and the display is still not lighting up then you more than likely have a problem with a voltage regulator. If the regulator shorts or opens then the meter lights will come on but the VCO / PLL circuit will be dead thus No receive or transmit.

Mar 05, 2014 | Cobra 29 LTD CB Radio

1 Answer

148 gtl cobra cb radio and the rx/tx light stay on


This sounds like a problem with the MB3756 Regulator IC. It controls voltage regulation and TX/RX Switching. It is a common failure in these radios. Check voltages with schematic that can be found at
CB Tricks Home Page

Sep 02, 2013 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Fuse keeps blowing when turning on power


When it does this voltage was hooked up backwards you will have to change the resistor.Don't try it again or you'll mess up the radio worst. The more you change the fuses the more it will mess up in the radio since you alwayed blew the resistor next to go will be your voltage regulator then the IC chip and so on.

Jul 19, 2010 | Cobra 29 LTD CB Radio

2 Answers

Love my radio but when i have in my trudc it


my radio did the same thing with the freq. jumping around from vibrations and bumps. I took it out of the bracket and laid it on the dash .that helped reduce the problem. when i took it to a repair tech he fixxed it in 2 minutes. he said the voltage regulator conections were loose , he resoldered them and the radio has been fine ever since.

Oct 29, 2009 | Cobra 200 GTL DX 4-Channels Base CB Radio

2 Answers

TRC520 CB wont power up


Hello, First of all you only have the Power wire Red, and the ground wire Black to connect for 12v DC to power the unit. If you memory power it is usually connected to a constant power source such as the cigarette lighter or continuous 12V dc powersupply off of the battery. These are the only connections that should be connected to provide power. Since the unit will not turn on I suspect that the CB's power supply and regulator have been blown. Another possible choice is that the radio was working and someone removed the antenna cable and the the RF power amplifier malfunctioned taking the power supply and regulator with it. To solve this problem, check the voltages on the wires before connecting them to the radio (these should be the 12 volt power off of the radio circuit, and the 12 volt power off of the continuous 12V connector (or the cigarette lighter). These voltages should read 12V. Connect the CB with it turned off and measure the voltages (should be 12V) Turn the radio on and check the voltages (should be a little less than 12V) If the radio does not come on then the internal power supply of the radio might be defective (In this case I would advise taking the CB to a qualified radio repair shop) I hope this helps Thank you, Shuttle83 http://www.electron-age-technologies-llc.com

Jun 11, 2009 | Radio Shack TRC-521 CB Radio

1 Answer

No cb channels no audio no recive


If you have no channel display or CB operation, it sounds like a blown voltage regulator that supplies power to the CB PLL circuit.

Sep 14, 2008 | Ranger TR-696F SSB CB Radio

1 Answer

Galaxy 88hl stuck on 24.178


Hello radiogeek,

it sounds like you have a bad voltage regulator since you are indicating that the voltage adjusted by L17 is random. Check all of your voltages from the power supply (regulator side), and make sure they are stable. You will find that you may have a bad voltage regulation circuit or a bad capacitor in the unit power supply.

Thank you,
Shuttle83

Nov 26, 2007 | Galaxy Radios DX- 88HL Base CB Radio

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