HW-101 alignment problem, neutralization

[Cal Barton]

Bob -

What was your source for the het xtals?

Thanks!  Cal Barton  N5RNL

----- Original Message -----
From: Bob, WB2UJD <BobbyTrip at AOL.COM>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Monday, March 25, 2002 11:50 AM
Subject: HW-101 alignment problem, neutralization


> Hello all,
>
> I have been working on the HW-101 I have owned since it was new (and I was
a
> young pup!) getting it back into good working order.  I replaced the 28.5
and
> 29.0 het xtals that had stopped oscillating and attempted to align the
unit.
> I have two problems, one of which I know what to do, but not how to do it.
> The other is a question for the group.
>
> 1.  I understand from reading Steve Ray's mods that the way to neutralize
> these rigs is the "no final plate or screen voltage" method.  I also
recall
> that the SB series rigs were done this way in the alignment (I think).  I
was
> imagining using a 350 MHz scope as the output indicator (this is what I
have
> that will measure a small RF voltage) any other suggestions?  So, my
question
> is can anyone point me to the pertinent manual pages for the SB-(102 I
> imagine?) which go through doing this, what to disconnect and where,
etc...?
> I think I can find the manual pages for download in a couple of places
> online, but which pages to get would be a great help.
>
> 2.  When going through the alignment, I found the RF output to be lower
than
> it used to be on all bands.  In fiddling around, I found that if I turned
the
> carrier null pot all the way CW, that the output came back to what I
remember
> getting in the past.  I did not get to trying to do the carrier nulling
for
> LSB and USB, and I imagine that it isn't going to work with what I have
found
> in trying to get good CW output.  I am planning again on using a 350 MHz
> scope as the output measurement device, I don't recall how I have done it
in
> the past without sophisticated equipment.  The question is what is likely
to
> be the problem?  I have measured the pot and it does not appear to be open
> (measures about half it's value in-circuit due to the the two series
> resistors and xfmr winding in parallel).  I am guessing one or more of the
> two (three?) xtals in the balanced modulator (or that area if it's not the
> bal mod) has died like the het xtals.  Thoughts, advice, suggestions?
Thanks
> in advance,
>
> Bob, WB2UJD
>
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