[Hallicrafters] SX-117 modification for use with HT-44

[David C. Hallam]

Skip,

I don't have a SX-117 so I can't say what value of trimmer should be used.
Generally the round ceramic trimmers of the "Erie" type, there are other
manufacturers, are used for that application.  For frequency determining
circuits, they should be the NPO or N750 temperature coefficient type.

David
KC2JD/4

> -----Original Message-----
> From: hallicrafters-bounces at mailman.qth.net
> [mailto:hallicrafters-bounces at mailman.qth.net]On Behalf Of Waldo
> Magnuson
> Sent: Wednesday, January 02, 2008 5:13 PM
> To: hallicrafters at mailman.qth.net
> Cc: Waldo Magnuson
> Subject: [Hallicrafters] SX-117 modification for use with HT-44
>
>
>     I have been trying to solve the problem I have with frequency
> stability when using the HT-44 in slaved mode with the SX-117.  The
> HT-44 manual has "SX-117 Notes" on page 14 of the manual.  Note 2
> states that on sets below s/n 117004 (mine is 117001) the replacement
> of the brass compression trimmer by a silver ceramic type capacitor
> should help with VFO drift or long-term calibration.
>     My question is - has anyone made this modification and what value
> ceramic capacitor was used?  Thanks.
> 73,  Skip W7WGM
>
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