[Elecraft] Calibration of BFO

[Dave Gingrich K9DC]

On Mon, 4 Feb 2002, David A. Belsley wrote:

> Randy:
>   I'm not sure what the meaning is of shifts less than 1 Hz -- other than 
> 0Hz.  It is my understanding that the BFO granularity is 10Hz, so the shift 
> would be some multiple (including zero) of 10Hz.

Actually, I believe the adjustment increment of the BFO is in 20 Hz 
steps. The VFO steps are 10 Hz. My comment about shifts less than 1 Hz is 
referring to frequency shifts when stepping through the four filter 
bandwidths. It can be less than 1 Hz.  It also will drive you nuts getting 
there. Sometimes just entering the filter alignment mode, making a change 
then returning back to the same setting and exiting will get it right on, 
sometimes it makes it worse. I've not discoverd the key to getting it 
right except to keep repeating the procedure... and then don't mess with 
it once you get it right. 

Once right, the shift between filters is stable... Which is not the same
as overall frequency stability of the rig. The K2 can drift a little
especially with temp changes, but it is generally much less 50 Hz so it
has never been a problem for me. 


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Dave Gingrich, K9DC - Indianapolis, Indiana  USA
K2 #2211, K1 #931, QRP-L #2376, ARS #1109,
FPQRP #389, IRLP #473, k9dc.ampr.org, CCIE #6748
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