Question about Radio Communications
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!
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Posted on Jan 02, 2017
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.
Posted on May 10, 2008
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
GOOD LUCK firstname.lastname@example.org
Posted on Jun 23, 2008
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
Posted on Nov 01, 2008
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