[Hallicrafters] SX-28 snipped wire puzzle

[Julian Bunn]

Hi Rob,

This is an SX-28. I need to double-check, but I haven't seen this
difference on the various schematics I have (including for the SX-28a).

Gary Brown has suggested it might be an accidental snip, during mods
or re-capping. I'm 100% sure I didn't snip it, so maybe when the PO
altered the circuit for the ANL it was done.

The crystal filter was working before I started on the set. I don't see
from the circuit why this snip would affect the crystal filter especially?

Julian



Rob Copeland wrote:
> Hi Julian,
>
> Is this a sx-28 or a sx-28a? If it is a sx-28 then they might of upgraded
> the circuitry to sx-28a specs. I would compare schematics of an sx-28a to
> your sx-28 to see if this is true. Otherwise, this would be a mod that is
> not part of either spec. If this is the case you can google for sx-28/sx-28a
> mods and see if this is mentioned somewhere on the internet. If it was me I
> would just rebuild it to sx28a specs this is what I have done with mine and
> it is rather easy to do as the differences are subtle. Thinking about this
> now makes wonder if the snipping was a mistake, because the 2nd IF can is
> part of the Crystal Filter. If the Crystal Filter is not working this may be
> why.
>
> Good Luck!
>
> Rob
>
>
>
> -----Original Message-----
> From: hallicrafters-bounces at mailman.qth.net
> [mailto:hallicrafters-bounces at mailman.qth.net]On Behalf Of Julian Bunn
> Sent: Thursday, February 08, 2007 11:11 PM
> To: hallicrafters at mailman.qth.net
> Subject: [Hallicrafters] SX-28 snipped wire puzzle
>
>
> In the process of re-capping my SX-28, I noticed that the wire between
> the tap on the secondary of the
> 2nd IF transformer, T2, and C33/R19 has been snipped.
>
> Can anyone offer a suggestion why this might have been done, and/or any
> reason why I shouldn't
> reconnect it?
>
> Thanks!
> Julian
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-- 
Julian Bunn,
Center for Advanced Computing Research (CACR),
California Institute of Technology,
Pasadena, California 91125, USA.
Tel: +1 626 395 6681, Cell: +1 626 375 4628
Web: pcbunn.cacr.caltech.edu/jjb.html