From: Eric Webner 
Subject: Re: [drakelist] TR7 Display Problem

I got the impression that the problem was caused by
"scraping" the exposed wire of the RFC against the
shield, other board, whatever in removing or inserting the VCO
board. Those slots are small, and there are lots of protuberances
and sharp edges to interfere. That choke is right on the edge of
the board, and does stick up pretty high.73, Garey -
K4OAHAtlantaDrake C-Line Service
Manual<HTTP: R-4C_Servicez hr99.home.mindspring.com
/>Eric Webner
wrote:>> Bud,>
> How did you guys determine that it was the choke. Did
the core crack > from physical damage, or did it go
intermittant or , , , ?>
 > 73,> > Eric
KA8FAN>> */Garey Barrell
/*
wrote:>>> Garey Barrell
made an utterence to the drakelist gang>
---------------------------------------------------------------------->
Wow! Talk about obscure....>> The ONLY
thing this choke does is filter the 24V supply to the PLL>
Loop> amplifier chip, so the VCO was yanked way out of
it's "normal" range.> I _TOLD_ you we needed to
measure the loop error voltage....! :-)> Yeah, right. At
least now we know it really WILL go that
high.>> Thanks for the
feedback!>> 73, Garey -
K4OAH> Atlanta>> Drake
C-Line Service
Manual>>>>>
sebdesn wrote:>>
>"sebdesn" made an utterence to the drakelist
gang>
>---------------------------------------------------------------------->
>Well finally,,,!
,>
 >> >Wanted to post the resolutio! n for the
archives in case anyone> else has this>
>problem.> >Many thanks to Bill Frost who
had the final answer, and Garey> Barrell,
and> >Peter VE3AX for some good troubleshooting
suggestions.> > The rig showed 96800.0 on
powerup(20m and below) and drifted down> >slightly.
VFO did not change anything. Counter worked properly in>
"ext"mode.> >All voltages from p/s board
were OK. 10R and 10T on main board> were ok
and> >switched properly xmit/ rcv. All oscillator
freqs were there and> right on.> >
The problem was choke RFC508 which is in the 24v circuit to the
VCO> >board.It is on the VCO board and is in a
position that could be> easily>
>damaged inserting the board. Replaced that, fired things up,
and> all is> >well. Will align and
put on the air..> > Again tha!
nks to
 all who helped. This is a great list and in my> case,
a> >real lifesaver!!!>
>> >73,de Bud WØHG>
>>----------------------------------------------------------------------On
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