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Cobra sr900 scanner

All codes are entered correctly,but scanner has no noise for squelch, plus will not pick up entered codes. It is sitting next to my other scanner with same codes, which is working..everything is quiet. It is scanning, but that is all. Thank you!

Posted by Anonymous on

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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Dodgem250
  • 68 Answers

SOURCE: 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

Posted on May 10, 2008

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  • 27 Answers

SOURCE: cobra 148gtldx low vol squelch on fm

Hi Mate, the problem you are having in not uncommon in the
COBERA 148 GTL. I suspect that the problem lies in low value uF electro caps drying out (electrolite) causing power down and frequency drift. The capacitors are in two forms..tiny blue tantalum, and standard radial base caps that are grey aluminium
cans with a black stripe,it would be a job for a skilled person in electronics to replace all of them. The square metal cans with a screw ferrite slug are what you use to tune the radio, and as there are lot of them ,and you don't have a circuit diagram ,it would be pot luck finding the right one/s. What you realy need to know is all electronic devices age and hence, no longer do their job.
it would cost more than the set is worth to rebuild it,but if you have the skills ,it can be done. am cb with usb / lsb are a thing of the past now and you would be better off buying a used set that is still in top working order. The uhf sets are useless as was the am sets depending on what you want the sets to do, in convoy.... great....in remote country....useless. Having said that the am/usb/lsb sets are the best of the three because on ssb they tx on about 12 watts rms so you have a better chance of making contact, but don't count on it as hf cb is no longer in
common use.
GOOD LUCK flyingfox@people.net.au

Posted on Jun 23, 2008

Shuttle83
  • 1139 Answers

SOURCE: cobra 29 no sound but it picks up

Hello Gentlemen,

It sounds like a problem with the audio output stage of the CB, to test this:

1) get a schematic of the CB
2) unplug and un-install the CB
3) put it onto a workbench, remove the cover, and use a 12volt DC power supply to power it
4) on the schematic find the point where the IF signal goes into the Quadrature Detector and test its level against the schematics level using an if probe and a voltmeter.
5) find the point where the Quadrature detector turns the IF into audio and then using an audio test amplifier see if audio is present at the output of the Quadrature detector.
6) If audio is present then trace the signal through the audio stages, until you find the stage where it drops out
7) if audio is not present, then the problem is the Quadrature detector.
8) In either case troubleshoot and find the bad components and replace them.
9) I would suspect bad capacitors, or a malfunctioning audio output IC.

I hope this helps

Shuttle83

Posted on Nov 01, 2008

audio20
  • 22 Answers

SOURCE: cobra 29ltd

You have antenna or Coax Problems...

Posted on Apr 23, 2009

  • 773 Answers

SOURCE: Cobra 25LTD WX Classic:

Make sure the the RF gain is up all the way. If it is then the collector diodes are probably blown.

Posted on Oct 14, 2010

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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

How do I program a uniden BC 145xl base scanner


  • Press the power button to turn the scanner on.
  • Press "MAN" (for manual)
  • Now pick a channel where you want to store a frequency at and enter it on the keypad.
  • Now press the "MAN" button again to go to that channel.
  • Now enter the frequency you want into that channel and don't forget to include the decimal point.
  • Now press the "E" button (for enter) and you have programmed one frequency.
  • Repeat these steps until your scanner is programmed.
  • Now you can press the up and down arrow buttons to scroll manually through the channels or just press "scan" to scan through them.
  • Make sure to keep your squelch just above the noise so you pick up stations well.

  • Hope this helps.

Nov 24, 2011 | Uniden Radio Communications

1 Answer

The scanner is a model PRO-2050. It will only do squelching sound on all the channels and will not bring in any messages. I completely emptied the scanner. Then I put channel..1-8 in. yStill hear...


Hello,

Once you hear the sqelching, than you want to turn it back just till it stops. Make sure you have your scanner antenna all the way up and adjust it, slowly down, till you scanner starts to pick up. Believe it or not, the antenna has alot to do with picking up signals. Plus, you need to have it by a window, to help pick up stronger signals.

Radio shack can make you a copy of all the codes for this scanner. I would contact them, about your problems.

Kind regards!

Sep 13, 2011 | Radio Shack Pro-2052 Scanner

1 Answer

SCANS BUT WILL NOT ICK ANY CHANNELS AND HAS NO


Turn the scanner on and volume up all the way, turn the squelch until you hear static, then turn the squelch down slowly until its silent, press scan, has it ever been programed? Just a thought. hope this helps..

Mar 25, 2010 | Radio Shack Pro-94 Scanner

1 Answer

It just scans and scans it never picks anything up. No clue how to work this scanner or where to get codes for it. When you turn it on, it just scans thru all the channels but doesn't seem to pick anything...


Sounds like either your squelch is set too high or you don't have the proper frequencies for your area programmed into the scanner. When it starts scanning turn the squelch down gradually until the scanning stops and you hear noise, then turn up slowly until it starts to scan again. If you still don't pick up anything, you probably need to reprogram the frequencies. For a list of active frequencies and systems in your area visit
www.RadioReference.com
or
www.CityFreq.com
In case you need it, here's a link to the manual for your scanner.

If you have any other questions, please contact us again.

If this response helps, please take a moment to post a rating for me. "Very Helpful" would be appreciated.

Nov 26, 2009 | Radio Shack Pro-2051 Base Scanner

1 Answer

Won't pick anything up (uniden BC72XLT)


Not sure this would be a solution but...
Make sure you don't have the Ch. Locked out so it just skips them..

You may also try and let the scanner sit on one frequency that you know has chatter and see if you receive.

This unit also picks up local weather try that feature and you can tell if you reception is working or not.

Jun 23, 2009 | Uniden BC72XLT Handheld Scanner

1 Answer

Cobra Police Scanner won't accept my frequency codes


when entering your codes make sure you put in the . or it will not take the number, most times the . is after first 3 # then hit enter then prg. I hope this helps.


k.ditterline@yahoo.com

Mar 09, 2009 | Uniden BC80XLT Handheld Scanner

1 Answer

Trouble programming


Part of this answer depends on whether your area is still running the standard broadcast radios or the "newer" trunk tracking style. The two are not compatible. If they are still standard, then press the E button to enter the program mode. Enter the desired freq. and hit the E button will enter the freq into memory. Tap manual to step to the next channel and repeat the steps to keep programming. Open the squelch to hear static then close just a little to quiet the noise and it should lock on and talk to you. Good luck with it,,and happy hunting. Mechanic

Jan 12, 2008 | Uniden BC340CRS Base Scanner

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