[Elecraft] 2nd XFil SSB MOD

Sun Sep 29 22:11:00 2002

Helm;
The resistor is needed to properly terminate the Xtal filter.  My
simulations showed that the smaller cap produced a flatter response than 120
pF used in the original design.
-John
 KI6WX

----- Original Message -----
From: "Helmut Usbeck" <[email protected]>
To: <[email protected]>
Sent: Saturday, September 28, 2002 9:19 PM
Subject: [Elecraft] 2nd XFil SSB MOD


> There is a take-off on the mod that uses a 100 pf cap instead of 120 pf
> that the original mod describes.  Also the mod with the 100 pf adds a
> 5.6K resistor across pins one and two of U11.  I presume that this
> resistor is for terminating the filter.  Is it really needed?  If so,
> why not terminate the original mod the same way?
>
> Regards,
> Helm.  WB2ADT
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