Question about Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

A problem in the squelch and volume control knob.

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  • 1205 Jun 22, 2008

    148gtl dx low vol from squelch no steps taken at moment except ive got a service manual

  • Dean Dishman May 11, 2010

    what problem are you having ? need more info

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  • Contributor
  • 27 Answers

What problem ?

Posted on Jun 22, 2008

  • flyingfox Jun 23, 2008

    Low speaker output in the cobra 148gtl is very common and was a problem when the sets when they were not as old as they are now. I think it is pension time for the old 148gtl...As a matter of interest almost all of the parts on the board are freely available with the exception of the onboard IC's>>>>TO 1205<<<< an emailed copy of the circuit diagram would be great if possiable.

    flyingfox@people.net.au

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1 Answer

How can I set the volume to low when I first turn my radio on it always seems to revert to high volume ?


Could be a bad volume switch . turn the radio on with the volume low and the squelch knob to see if the audio goes away. If not change the on/off switch .

Dec 29, 2015 | Radio Communications

1 Answer

Why don't I have sound on uniden pc78ltw?


the knob that turns the radio on and off is the volume potentiaometer.turn it 1/2 wayopen.the next knob is the squelch maqke sure it is all the to the left.the next knob is the mic gain and the RF gain.Set the mic gain at 1/2 and the RF gain all the to the right.the next knob is the delta tune,set it 1/2 way the next knob is the calibration knob leave it alone.Now above those knobs are little switches .the third switch from the left is for CB/PA make sure its on CB. check the WX switch and make sure it not on a weather station. and finally the last switch to the right is called a dynamic squelch switch.Make sure it is down. with all said your radio should be on and you should be able to hear sound. If not ,take an external speaker and hook it to the external speaker plug in the back of the radio.If you hear something then you internal speaker is junk.replace it .

Sep 04, 2014 | Radio Communications

1 Answer

Knob replacement


from an old parts radio. you should see mine,I have three different types of knobs on it.

Jan 24, 2014 | Radio Communications

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 Radio Communications

1 Answer

Cb has power but no squelch,can't recieve or transmit


Begin with
  • Volume knob 12 o'clock position
  • Squelch knob full counter clockwise
  • RF gain knob full clockwise
  • Pa/CB switch to CB
  • Mic plugged in
  • Check coax and antenna connections.
  • Make sure your antenna gommet/insulator is installed correctly or it will directed gound. Treat antenna shaft as it is the positive portion of circuit.
If you have another CB check the antenna system with that rig. To verify it is a radio issue. Then dig deeper Microphone, PLL chip, Audio chip etc.

Jan 11, 2011 | Cobra 29 LTD CB Radio

1 Answer

I have 4 wires that came loose on my volume/squelch knob. 2 are black, 1 white, 1 green. trying to figure out where they go.


Nothing Yellow Black
Green White Black
Orange Red


The black wires are both ground connected into the same part in the board. Just connect them depending on length.

This is the picture of the vol knob, with the dial upward looking down on the tabs. The top wires, yellow and black, are for the volume. The Middle row, green, white and black are for the squelch. the orange and the red are the power switch.

Nov 25, 2010 | Cobra 29 LTD CB Radio

1 Answer

My radio recieves ok but only whistles when i key the mike is this a major fix?


Do you have talkback installed? It my be too loud and causing feed back. Back the mic gain down if so.

Could also be improper mic wiring. If you use a mic that is wired for a different radio, it could just cause a hum, buzz or squeal.

Another thing that can cause a hum, buzz or squeal is a faulty volume and or squelch knob depending on the radio.

  • Turn down or disable talk back.
  • If you cannot turn off or disable talk back, lower mic gain.
  • Try a different mic that you know is wired for cobra.
  • Play with volume and squelch knobs while TX and see if it stops at all. If it does replace knob.

Oct 12, 2010 | Cobra 150 GTL DX Base CB Radio

1 Answer

How do i set my knobsso my radio works


Turn the volume up about 1/3, the squelch off or fully counterclockwise. You should now hear static or talking,if not something is wrong with the radio. As a last resort change to channel 19 and see if it is dead as well. None of this is valid unless you have a proper antenna connection. When you are receiving then adjust the volume to a comfortable level and turn the squelch up, clockwise, until it just mutes when no one is talking. The higher the squelch the stronger the signal has to be to be heard.
Good Luck,
Gilshultz

Dec 01, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

Squelch doesnt work


Open the component / speaker side cover on the radio, adjust VR3, this is the alignment control for the squelch. Set your squelch control knob on the front of the radio to about 10 o'clock and slowly adjust VR3 until the signal from the speaker is mute.

When you turn the squelch back to the 0 position, you should have signal with no squelch as in normal operation.

Thanks!
Dodgem

http://dodgem250.angelfire.com

Apr 06, 2008 | Cobra 29 LTD CB Radio

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