XV144 LO frequency

[Bo, OZ2M]

Hi all

During the Christmas holidays I finally decided to assemble my XV144, and
XV432 too. Much to my surprise the XV144 design does not come with an LO
adjustment possibility. This is relevant for me as I do not use it with an
Elecraft or other "display trick" capable radio.

Has anyone already done a XV144 LO real frequency tuning mod?

73
Bo, OZ2M - Looking for DX? Try VUSHF DX-peditions www.rudius.net/dxp

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[Don Wilhelm-4]

Bo,

You certainly are welcome to try pulling the crystal frequency with a
small parallel or series capacitor, but the stability may suffer - I
have not tried it, this is a theoretical guess.
Remember the crystal in all except the XV50 are overtone crystals - the
XV50 uses a fundamental mode crystal and can be pulled using normal VXO
oscillator techniques.

73,
Don W3FPR

Bo, OZ2M wrote:

> Hi all
>
> During the Christmas holidays I finally decided to assemble my XV144, and
> XV432 too. Much to my surprise the XV144 design does not come with an LO
> adjustment possibility. This is relevant for me as I do not use it with an
> Elecraft or other "display trick" capable radio.
>
> Has anyone already done a XV144 LO real frequency tuning mod?
>
>  
>

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[Bo, OZ2M]

Hi Don et al.

Yes indeed the stability is the issue. Tweaking the frequency is a piece of
cake.

73
Bo, OZ2M - Looking for DX? Try VUSHF DX-peditions www.rudius.net/dxp
----- Original Message -----
From: "Don Wilhelm" <[hidden email]>
To: "Bo, OZ2M" <[hidden email]>
Cc: <[hidden email]>
Sent: Tuesday, January 12, 2010 11:40 PM
Subject: Re: [Elecraft] XV144 LO frequency


Bo,

You certainly are welcome to try pulling the crystal frequency with a
small parallel or series capacitor, but the stability may suffer - I
have not tried it, this is a theoretical guess.
Remember the crystal in all except the XV50 are overtone crystals - the
XV50 uses a fundamental mode crystal and can be pulled using normal VXO
oscillator techniques.

73,
Don W3FPR

Bo, OZ2M wrote:

> Hi all
>
> During the Christmas holidays I finally decided to assemble my XV144, and
> XV432 too. Much to my surprise the XV144 design does not come with an LO
> adjustment possibility. This is relevant for me as I do not use it with an
> Elecraft or other "display trick" capable radio.
>
> Has anyone already done a XV144 LO real frequency tuning mod?
>
>
>

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Please help support this email list: http://www.qsl.net/donate.html