[NJARC] Crystal Operation

[John Ruccolo]

Hi Scott,

Yes your assumption is correct -- that's pretty
standard with crystal filters. When the crystal filter
is OFF, it's been "shorted out" of the cicuit by that
toggle switch. Electrically speaking, the switch is
ON, of course, but the *crystal* is off -- (out of the
ciruit).

And I see that you've also discovered that old toggle
switches sometimes fail. I've never bothered to try to
take one apart and repair it. I wonder if that's
possible? (I mean, beyond just cleaning dirty
contacts).

JR

--- Scott Roberts <ng19delta at yahoo.com> wrote:

> Visit our web site - See http://www.njarc.org
> _______________________________________________
> Here is a simple question, hope I get a simple
> answer... ;)
> 
> I am working on the Hallicrafters SX-16, and am
> trying
> to figure out the crystal switch operation. I
> discovered the old crystal switch was bad- it would
> click over, but with a muffed click, and not
> actually
> switching. So I replaced it(junk box to the rescue!
> Perfect match) and noticed when the switch is in the
> "on" position, it is in the "out" position for the
> crystal, and when in the "off" position, it is in
> the
> "in" position for the crystal.
> 
> I looked at the schematic,(it is SW1), and the
> switch
> is connected parallel to the crystal. It looks to me
> that when the switch is in the "[switch]on" or
> "crystal out" position, that it creates an easier
> path
> for current flow, and when in the "[switch]off" or
> "crystal in" position, that the bypass is closed,
> forcing power to go through the crystal, thus
> operating it.
> 
> Is this assumption correct?
> 
> Thanks!
> Scott
> 
> 
>      
>
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