From: "VE3AX" 
Subject: Re: [drakelist] Drake 2-C Problem Help Please


"VE3AX"  made an utterence to the drakelist gang
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Jim:

This sounds similar to the problem I am having with an R-4B I was trying to
get running last night.  Things improved after changing out some leaky tubes
and I can get the 1.35 volts at TP-2 in the R-4B, but I am still having the
zeroing and max S-meter deflection symptoms you describe.  S meter rises
about 3 s-units in AGC OFF position after "zeroing" (just!) in slow/fast
positions and that happens only if I crank the S meter zero pot to the end
of its range.  All resistors, diodes, voltages in that area check OK.  S
meter sensitivity will bring the meter to only about 20db over S-9 at the
end stop of its range.

Please post the suggestions when Garey answers you.  Listening Garey???!!!

Thanks and 73

Peter
VE3AX

----- Original Message -----
From: "Jim" 
To: 
Sent: Thursday, February 10, 2005 12:05 AM
Subject: [drakelist] Drake 2-C Problem Help Please


>
> "Jim"  made an utterence to the
drakelist gang
> ----------------------------------------------------------------------
> Hello,
>
> Fired up a 2-C today that I had bought a year ago (oversea travel) and it
> has a problem on receive.
>
> It appears to be an AGC problem.  The radio has better
"ears" in the slow
or
> fast position (when receiving CW, there is no difference between slow or
> fast like other 2-C's I have used before) when compared to the off
position
>
> After the radio has been on for 10 minutes the receive sensitivity starts
to
> fade.  If I switch AGC off and then crank the rf gain, there is a slight
pop
> in the audio and the receiver again has ears.  This fade happens about
every
> minute or so.
>
> I tried the alignment procedure in the manual and I cannot adjust the
> voltage at TP1 (agc voltage) when in the slow position to the specified
> minus 1.35 volts, I can only get to minus 1.0 volts.  When I switch to the
> off position, the AGC voltage goes more negative (minus 2.6 volts).  This
is
> of course with the pot cranked to the end stop.
>
> After I had the radio on for one hour, the sensitivity did not fade, but
the
> radio had better ears in the slow and fast position compared to AGC off
AND
> there is no difference in the receive audio in slow or fast position.
>
> Also the AGC voltage could not be adjusted to minus 11 volts when I
cranked
> the RF gain control counter clockwise.  I could only get to minus 8.5
volts.
>
> I have cleaned the switches and all power supply voltages are present
(+135,
> +92, +12, minus 52 volts, etc).
>
> Any and all help appreciated.
>
> Thanks
>
> Jim
>
>
>
>
>
> ----------------------------------------------------------------------
> On Behalf of "Jim" 
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----------------------------------------------------------------------
On Behalf of "VE3AX" 
Submissions:        drakelist{at}www.zerobeat.net
Unsubscribe:        majordomo{at}www.zerobeat.net - unsubscribe drakelist in body
Hopelessly Lost:    majordomo{at}www.zerobeat.net - help in body of message
Zerobeat Web Page:  http://www.zerobeat.net
Brought to you courtesy of TLCHost.net  http://www.tlchost.net/
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