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Re: RE: Drake 2880 conversion crystal

Here's the N1GKZ conversion to 430 MHz:

Note the PLL does not lock at the required conversion frequency, so a slight 
mod is required.
Jerry, K5OE

71611.76@compuserve.com writes:

> I've had a few questions on what kind of crystal to use to convert the
>  Drake 2880 to a 70cm IF. Because the LO multipllies by 256, a
>  microprocessor crystal of 7.68 MHz will give a 1966.080 MHz LO. Since the
>  2880's normal IF is pretty close to 70cm, no IF mods are required (though
>  they won't hurt).
>  Suitable crystals are Mouser 520-HCA768-20 (HC-49/U can; it's too tall for
>  the enclosure so it has to be laid down some when installed) and Mouser
>  520-HCU768-20, which is a very short HC-49/US and fits fine. It costs a
>  massive $1.12.
>  If the frequency conversion is a little strange (2401 MHz RF ~ 434.92 IF),
>  who cares? Doppler and yet-unknown final satellite LO frequencies will mess
>  nice even conversions up anyway.
>  Enjoy,
>  Ed Krome K9EK
>  (No, this conversion isn't in "Mode S: The Book", but lots of other stuff
>  is... call AMSAT for a copy.)
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