COM205 Commtel. Never finds a station

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Re: COM205 Commtel. Never finds a station

Postby Indrid Cold » Wed Mar 06, 2019 3:29 pm

Finally, the device seems to have come back to life - I commissioned my friend some mods and improvements, including replacing some capacitors, S-Meter output from discriminator, keyboard beep volume regulator, realignment, opening frequencies and audio enhancement:

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Then, I shielded the inside of the plastic cover, to exorcise interferences that could be the cause of the sudden 'deafness':

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My friend tested the S-Meter output just implemented with the one of an old Alan 48 CB, and then he has calibrated it accordingly - one like this, that another friend will give me in a few days:


But I've found this beautiful S-Meter, from a professional radio bridge, hoping to use this one instead!

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So, i love this scanner... yes, it has been the first for me, but I see it is still much appreciated. Is there anyone here who is still using it?
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Re: COM205 Commtel. Never finds a station

Postby m0lsx » Wed Mar 06, 2019 5:00 pm

That all looks good. Was a problem found? Or was it just a mixture of age, dust (which can go dry, that is become a conductor.) etc etc?
Back in the late 80's or early 90's. GCHQ had a monitoring unit in Lincolnshire that listened to Russian trawlers & when Lincs FM started, GCHQ, who the government had just said was far too important to our security to allow unions within. Complained that Lincs FM was causing them interference.
It turned out that this vital security service was so vital that none of the radios had been serviced for years & simply dusting the circuit boards off, stopped the interference. :embarrased: :embarrased: :embarrased:
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