Re: [amsat-bb] Drake 2800 mod picture/ 22 pF caps

[Bill Richarz <wricharz@xxxxxxxx>]

I agree with a picture being worth a 1K words.  I'm also uncertain how the
new IC and the choke and resistor actually connect to the board after
removing some of the lines.  A good drawing would be helpful here also.
I can read the schematic, but would feel more comfortable in knowing how
everything is supposed to fit on the board.

Any artists out there?

de Bill, N4DH

At 13:37 2/10/01 -0500, Mark L. Hammond wrote:
>Does anyone have an image showing precisely where the two 22 pF caps are 
>soldered on the Drake 2880?
>
>I'm referencing this:
>
>http://www.g3pho.free-online.co.uk/microwaves/drake2.htm
>
>"Looking closely at the circuit, we found a green coil in the middle of 
>the IF section of the board. This has two chip capacitors, one eitherside 
>of it, and together they form a series tuned circuit at the original  I.F. 
>of 300MHz. By adding a 22pF capacitor in parallel with each of these two 
>chip caps the resonant frequency can be reduced closer to 144MHz."
>
>I think I know where, but a picture is worth a 1,000 Drakes ;-)
>
>73,
>
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