[Elecraft] K2 BFO Test

[Ken K3IU]

Sverre:

This fix (that you describe) worked for me on a K2 that I built within the
past year. The LOW BFO freq was just slightly high and putting a low value
cap as you describe lowered the LOW freq to within specs, didn't change the
high BFO freq, and did not cause any instability. I don't remember the exact
value cap I used and the K2 is no longer here for me to look at.
 
73,
Ken K3IU

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Sverre Holm
Sent: Thursday, December 08, 2005 4:07 PM
To: w3fpr at arrl.net; elecraft at mailman.qth.net
Subject: RE: RE: [Elecraft] K2 BFO Test

> -----Original Message-----
> 
> The preferred method of padding the BFO capacitors is to maintain the 
> ratio between C173 and C174 by paralleling them with capacitors.  A 
> single capacitor from the junction to ground will be in parallel with 
> the series combination of
> C173 and the varactor D38 and could make the BFO less stable than it 
> should be.
> 

Don,

How about a single capacitor (1-4 pF) from the junction of the crystals and
the L33 inductor as in
http://www.ac6rm.net/mailarchive/html/elecraft-list/2005-08/msg00562.html?
Does that create potential stability problems also?

I've got this link on my K2 mods page and just wanted to make sure I can
recommend it and keep it there. I have never had any problems with BFO range
myself so I have no personal experience with this myself.

73

Sverre
LA3ZA
http://www.qslnet.de/la3za/
 

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