hw-101 cw (part 2)

[charles w. morehouse]

What is the part # on the PEC?
Wayne;
W4GBW

wa1vwl wrote:
>
> My guess is the PEC is nothing more than R's and C's which makes for some
> kind of phase shift oscillator. The only problem (it's a big one) will be
> guessing what values R's and C's were used.
> ----- Original Message -----
> From: n7kbj <n7kbj at ONEIMAGE.COM>
> To: <HEATH at LISTSERV.TEMPE.GOV>
> Sent: Sunday, December 19, 1999 7:13 PM
> Subject: hw-101 cw (part 2)
>
> Part 2:  with the help of several who replied to my first post, I found
> several
> resistors that had gone out of spec - replaced them and some electrolytic
> caps
> (on general principles) and good news - the rig now works much better on cw
> than it did - when it works.  It appears to be a 'thermal' problem as cw
> works
> fine when the rig is first turned on - after 1/2 hour warm-up, kapoot.
> Tracing
> the tone thru V15 (the tone osc and amp) I find I'm losing it right at the
> input
> (pin 9) - either no tone or it slooowly builds over about 5 seconds.
> So - my next question:  I'm begining to suspect the 'PEC' that forms part of
> the
> osc as everything else in the osc circuit either checks out or has been
> replaced.
> Can one 'breadboard' together a substitute for the pec and have it work ok??
> or is there a replacement source for the pec?
>
> Jim - n7kbj at oneimage.com
>
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