[Hallicrafters] SX101

[wb8jkr at juno.com]

 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