From: Garey Barrell 
Subject: Re: [drakelist] TR7 Display Problem


Garey Barrell  made an utterence to the drakelist gang
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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
http://hr99.home.mindspring.com/R-4C_Servicez/>



sebdesn wrote:

>"sebdesn"  made an utterence to
the drakelist gang
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>Well finally,,,,
>
>Wanted to post the resolution 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 thanks to all who helped. This is a great list and in my case, a
>real lifesaver!!!
>
>73,de Bud WØHG
>  
>
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