[Elecraft] BFO test??

Nate Lewis [email protected]
Tue Nov 26 12:49:08 2002


#3051:
BFO high freq: 4917.10 (must be >= 4916.3 kHz)
BFO Low Freq: 4912.94 (must be <= 4912.7 kHz)

same fix?

----- Original Message -----
From: "Wayne Burdick" <[email protected]>
To: "N0SA" <[email protected]>
Cc: <[email protected]>
Sent: Saturday, November 23, 2002 8:47 PM
Subject: Re: [Elecraft] BFO test??


> Larry,
>
> We discovered recently that some of the BFO crystals, from a new
manufacturing
> lot, had higher Q than usual. You apparently received one of these sets,
even
> though we've tried to pull them all out of stock.
>
> The high-Q crystals will work very well, but you'll need to increase the
> capacitance of C174 and C173 to get another few hundred Hz or so of range.
We
> have already solved the problem this way in two cases that I know of.
>
> All you need is a capacitor in the range of 39-68 pF to parallel across
C174,
> and one in the range of 100-180 pF to parallel across C173. The capacitors
> should be of a stable type (NPO or C0G or N750; disc, mono, S.M.,
polystyrene,
> etc.). If you don't have a couple of usable caps laying around, send
e-mail to
> [email protected] and we'll get them out to you.
>
> Sorry for the inconvenience.
>
> 73,
> Wayne
> N6KR
>
> N0SA wrote:
> >
> > I am doing the BFO test on my new K2 #3045. I get a swing of only
3.22Khz. I have checked all the parts in the bfo, L33 D37, D38 ,caps etc and
have checked the 4Mhz osc for calibration. I can find nothing wrong. Anyone
have any suggestions?
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