[Hallicrafters] SX101

[wb8jkr at juno.com]

 Very true, I use a freq. counter on my generator
for both accuracy, and resetability.

Mark  WB8JKR

On Sat, 29 Jan 2005 09:01:02 -0600 k0ewu at juno.com writes:
> And another caution, unless you have a very accurate signal 
> generator,
>  don't mess with the 50 kc adjustments.  I have had to realign quite 
> a 
> few sets that someone guessed at.  If there is a bad transformer, 
> and 
> this does happen, the signal will be almost unreadable.  very weak.
> jack           K0EWU at juno.com
> 
> On Sat, 29 Jan 2005 09:46:21 -0500 wb8jkr at juno.com writes:
> > 
> >  How far does the sensitivity drop? It may
> > or may not be an alignment problem.
> >  If it is alignment, I would think it would
> > be limited to the front end and/or mixer.
> >  But I would first try testing or subbing the
> > oscillator tube, RF amp, the mixer and
> > checking the oscillator injection levels
> > at the higher frequencies. I've got two SX-101A's
> > and they are pretty much straight forward with
> > a few cautions: don't touch the soldered trimmers,
> > 99% of the time its not needed. Don't play with the
> > crystal activity adjustments for the same reason. And
> > the BFO adjustment can be confusing, if the BFO is set
> > wrong, bye bye to sideband suppression.
> > 
> > Mark  WB8JKR
> > 
> > On Fri, 28 Jan 2005 22:39:08 -0600 "Bill Campbell" 
> > <wd4hen at bellsouth.net>
> > writes:
> > > I have a SX101 that needs a complete alignment.  I have replaced 
> 
> > all 
> > > the
> > > paper caps and replaced tubes as necessary.  Receives well on 
> the 
> > 
> > > lower
> > > bands but sensitivity decreases rapidly as frequency goes up. 
> > Hence 
> > > the need
> > > for alignment.  I have a SIG-103/URM-25F signal generator which 
> 
> > will 
> > > go down
> > > to the 50.5 kc IF that is needed.  I have reviewed the manual 
> for 
> > 
> > > the proper
> > > procedure which seems rather straight forward.  However,  I have 
> 
> > > never
> > > aligned a receiver, much less one as complex as the 101.  If 
> those 
> > 
> > > of you
> > > who have done a 101 can give me any hints, kinks or cautions I 
> > > would
> > > appreciate hearing from you.  This is a very nice radio and I 
> want 
> > 
> > > to do the
> > > best job possible.  Also, have a nice working HT32A to go with 
> it. 
> > 
> > > It will
> > > be a next recap job.  Thanks in advance.
> > > 
> > > Bill - WD4HEN
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>