hw-101 cw (part 2)

[wa1vwl]

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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