Re: K2 BFO Test
Posted by
Bill Coleman-2 on
Dec 11, 2005; 12:55am
URL: http://elecraft.85.s1.nabble.com/K2-BFO-Test-tp384371p384377.html
On Dec 9, 2005, at 8:56 AM, Don Brown wrote:
> I have used this method on 3 or 4 of the K2's I have built. I use a
> 1pF or
> 2pF NPO cap to lower the bottom end of the range to get it to meet
> the spec.
> I agree with you on pulling the crystal much with this method. I
> would not
> recommend cap values above maybe 3 or 4 pF. I have never needed
> more than 1
> pf. Padding C173 and C174 is a better method if the radio needs
> more than 1
> or 2 pf. I believe this method was suggested by Gary at Elecraft
> some time
> back. At any rate it is a little easier to do than the padding or
> change out
> of C174 and C173
To get the BFO range I needed for RTTY, not only did I have to pad
C173 and 4, but after I had added maximum capacitance there, I went
ahead and added 2 pF to pull the crystal. I have not noticed any
stability problems, and the BFO range is just about perfect.
Bill Coleman, AA4LR, PP-ASEL Mail:
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Quote: "Not within a thousand years will man ever fly!"
-- Wilbur Wright, 1901
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