John,
If you contact that government agency with the Sensicon 'A'
Receiver strip, you might caution them on a factory designed
built-in flaw.
The plate of the audio output stage has a chassis mounted .01
or .02 mfd bypass capacitor going to chassis ground.
If that capacitor ever shorts, the output transformer will be
toast very shortly. The fix is a replacement disk-ceramic
capacitor from plate to the screen grid on that 6AQ5.
Been there, replaced that transformer - not fun.
The 'A' Series of the transmitter strip on both low and high bands
also has a 'needs to be replaced' from time to time. There is a
three section electrolytic capacitor in the speech amp section that
opens up sooner or later. One part of the resultant is the
deviation seems to go very wide as the B+ bypass is now open.
Another is if the lower frequencies of a human voice / PL tone
modulation seems quite low. The Modulation tube 7V7 cathode by-pass
capacitor has opened up.
The PL version of the low and high band Sensicon 'G' Receiver ...
the PL receive sensitivity seems to have gone away, the electrolytic
coupling capacitor in the PL decoder circuit has opened up.
The UHF 'B' receiver ... there is a 8200 ohm 2 watt carbon dropping
resistor from B+ to the plate of the gas regulator tube. After a
few years, the value has dropped quite a ways - a good fix is a 10K
3 watt wirewound resistor.
Hope this helps,
Neil - WA6KLA
JOHN MACKEY wrote:
>
> I'll bet there are still a hand full of G strips & A strips on the
> air. I know of one city government that uses a G strip to receive
> weather braodcasts on their 800 MHz trunked radio system. There
> are a few people who believe that there was never a better receiver
> for high intermod locations than the hi-band A receiver with the
> "stove-pipe" properly tuned.
>
> ------ Original Message ------
> Received: Sat, 05 Mar 2005 09:34:54 PM CST
> From: Joe Montierth <[EMAIL PROTECTED]>
> > Thats the way I am feeling about the "Vocaline" and
> > "Twin Vee" threads. At least people are still using
> > micors for repeaters, don't know how many Twin Vee
> > strips are still being used.
>
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