[Elecraft] Design reasons for X7-X11 case soldering

Wed Jun 11 22:17:00 2003

Mine says to solder at the bottom starting with X7.  X1 is soldered at the
top and also X3,4.

73,
Tom, W6WW
K2 #3453

----- Original Message -----
From: "Harry Yingst" <[email protected]>
To: "Tom, W6WW" <[email protected]>; <[email protected]>
Sent: Wednesday, June 11, 2003 2:30 PM
Subject: Re: [Elecraft] Design reasons for X7-X11 case soldering

> My K2 3458 had you solder to the bottom right in the manual (and on
> both sides)
>
>
> I did the SSB adapter on my own
>
>
>
>
>
> --- "Tom, W6WW" <[email protected]> wrote:
> > So should I change the top-soldered crystals to bottom side
> > grounding?
> >
> > 73,
> > Tom, W6WW
> > K2 #3453
> >
> >
> > > Actually, the desired result of grounding the crystal cans with a
> > direct
> > > lead is a low inductance ground that sets up a shield to crystal
> > signal
> > > blowby, thus improving the performance of the filter.  Stray
> > coupling of
> > the
> > > signal you are trying to filter might be greater if the cans were
> > all at a
> > > higher impedance than direct grounding them creates.
> > > You are converting the cans from acting as plates of a capacitor to
> > acting
> > > as a shield.
> > >
> > > Often crystals have a steel type can, and thus you also are getting
> > the
> > > magnetic shield tied well to ground.
> > > -Stuart K5KVH
> > >
> >
> >
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>
> =====
> Harry - AB2PN
>
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