Well, I thought it might be time to update you folks on where my K2
build stands.
Yesterday I began Alignment and Test Part II. Things were nominal until
it came time to do the VCO voltage readings, some of which were fine and
some were way out of wack. Following the helpful guidance in the book, I
discovered that C73 on the RF board was occupied with that 4.7pf cap I
couldn't find (as opposed to the 47pf cap that's supposed to be there).
With that corrected, the VCO voltage readings on each band fell into
line, and I'm now up to the BFO test. There's just plain no signal that
CAL Fctr can find at TP2, even though there *is* a 4918 kHz or so signal
at U11 pin 6, and even at the ungrounded side of C169. Q24 *looks* OK,
but what can you tell by looking? :-)
I've just started squinting at the schematic to see where I should be
looking for other possible sources of the problem. Of course, I'm
looking for the perpetual prime suspects: solder bridges and
cold-soldered joints, but haven't found any yet.
I also noted that something has the S-meter calibration in an uproar; it
set up with completely nominal values originally but now requires
extreme settings to unpin it from the top end and the RF gain doesn't
move the lit bar around like it used to.
Suggested avenues of investigation are welcome...
73 de Maggie K3XS
--
-----/___. _)Margaret Stephanie Leber CCP, SCJP/"The art of progress /
----/(, /| /| http://voicenet.com/~maggie SCWCD/ is to preserve order/
---/ / | / | _ _ _ ` _ AOPA 925383/ amid change and to /
--/ ) / |/ |_(_(_(_/_(_/__(__(/_ K3XS / preserve change amid/
-/ (_/ ' .-/ .-/ ARRL 39280 /order."-A.N.Whitehead/
/________________(_/_(_/_______AMSAT 32844_/<[EMAIL PROTECTED]>/
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