[Hammarlund] drift of receiver HF oscilator

[Ken Hickman]

Hi John,

The SP-600 to my knowledge is a Superheterodyne. They have a fixed
frequency local front end oscillator to mix with the various incoming
signals
to give the desired Intermediate Freqency.

You will need a crystal for each band. The local front end oscillator is not
variable but must be a different fixed frequency for each band. You will
need a crystal for each band.

Good luck on a project to include crystal control.

Ken   N5CM

----- Original Message ----- 
From: "RJ Mattson" <rjmattson at hvi.net>
To: "John King" <k5pgw at yahoo.com>; <hammarlund at mailman.qth.net>
Sent: Monday, September 04, 2006 12:29 PM
Subject: Re: [Hammarlund] drift of receiver HF oscilator


> If that mixer oscillator were crystal controlled, you would only receive
one
> frequency.
> The variable mixer osc gives you a band of frequencies.
> bob..w2ami
>
> ----- Original Message ----- 
> From: "John King" <k5pgw at yahoo.com>
> Subject: [Hammarlund] drift of receiver HF oscilator
>
>
> Has anyone made the oscilator crystal controlled or
> ever saw a modification for that? Would be interested if there is a mod
for
> crystal
> control of the drifting oscilator. 73, John, K5PGW
>
>
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