Re: [amsat-bb] Drake frequencies

["Mark L. Hammond" <hammond@xxxxxxxxxxxxxx>]

At 01:42 PM 2/13/2001, you wrote:
>Floyd,
>
>The stock crystal frequency in the Drake 2880 MMDS converter is 8.89843
>MHz.  The formula is:
>
>(2400 - X) / 256 = 8.89843; solving for X, I get 122.00192 MHz, if I've
>got my sums right.

Okay, I got curious.  I've read that for the stock Drake, 2400=120 MHz, and 
2400=122 MHz.

So--which is it?

I inspected my unit (from the group purchase..thanks, Mark :) and the stock 
crystal in mine is indeed 8.89843.

After pointing my array into the shack, I used my HT to xmit on 150.01.  I 
heard the carrier at 122.152 +/-.  Assuming I am hearing 150.01 X 16 
(2400.16), this pretty much says for my unit, 2400=122 MHz with the stock 
crystal.

And xmitting on 150.100 (x 16 = 2401.600), I can hear it on 123.589 (2401.589).

I was incorrectly assuming 2400=120MHz this weekend; no wonder I couldn't 
hear it :)  Boy do I feel better now!

73,





Mark L. Hammond  [N8MH]

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