[Hallicrafters] SX-117 Crystal Quandry

[rdhalste]

----- Original Message -----
From: "Charlie Chisholm" <no7up at yahoo.com>
To: <hallicrafters at mailman.qth.net>
Sent: Monday, March 04, 2002 3:49 PM
Subject: [Hallicrafters] SX-117 Crystal Quandry


> Hello all -
>
> I have an SX-117 with a "shot" USB crystal.

It's been a long time since I owned the SX117 and HT44 setup, but "as I
recall" the difference was they changed the frequency of one of the
crystals, OR they changed the "transceive" circuit slightly.  Mine worked
fine and I never had to make any changes. It was one of the early ones too.

It "seems" as if it was a relatively simple fix.
Not so with the ceramic caps that went out.  I had to replace all of the
coupling and bypass caps in the driver and final.  These were all disk
ceramics which became leaky.  The driver plate voltage was leaking through
the coupling cap into the grid circuit for the finals.  Sure made setting
the bias a bit of a problem.

There was also one stage in the receiver where I had to replace all the
ceramics.  That one I don't remember.  I do remember taking the entire
circuit out of the receiver and replacing it.  All I remember was that it
was over in one corner.
>

> So I am going to have to replace the "matched" set,
> but I have no idea what the specs on the crystals are.
>  Freqs are 1600 kHz and 1700 kHz. I don't think I
> should just order "standard" crystals, because of a
> footnote in the manual that talks about some crystals
> from earlier versions not working right in transceive
> mode.  It sounds like these sideband crystals have to
> be a certain spec.  Does anyone have the specs for
> these crystals?  Jan doesn't have any idea - they only
> have the specs for the "band" crystals, not these

I'm not so sure that it is a "spec" rather than a frequency change.  It's
just been too long ago to remember though.
Me? I'd just order the standard ones and give them a try.
As I recall, there are two complete sets. One in the receiver and one in the
transmitter.  It seems as if it used the ones in the receiver for
transceive, but I could easily be wrong. (not the sideband generator
crystals)

Roger (K8RI EN73)
WWW.RogerHalstead.com
N833R, World's Oldest Debonair? S#CD-2

> "special" sideband crystals.
>
> Any help would be greatly appreciated.
>
> Many Thanks,
> Charlie NO7UP
>
>
>
>
>
> __________________________________________________
> Do You Yahoo!?
> Yahoo! Sports - sign up for Fantasy Baseball
> http://sports.yahoo.com
> _______________________________________________
> List Administrator: Duane Fischer, W8DBF **for assistance**
> dfischer at usol.com
> ----
> Hallicrafters Collectors International: http://www.w9wze.org
> ----
> http://mailman.qth.net/mailman/listinfo/hallicrafters
>