[Elecraft] K2 w/KSB CW reverse BFO

[kc4kgu@ENTERZONE.NET]

On Thu, 31 Oct 2002 k6se@juno.com wrote:

> KC4KGU wrote:
> 
> "I then dialed up 4000.00 and verified that CW + SPOT was zerobeat with
> the birdy and the I got a 600Hz tone verified with Spectrogram.
> 
> I repeated with CW-R, USB at 3999.40 and LSB at 10000.60.....
> 
> ...Does anyone see any error in my methodology as described above?"
> ==========
> First, I think you meant "LSB at 4000.60" above.  Actually CW and CWR are
> "USB" and "LSB" respectively (depending on the band the K2 is on), so
> when you refer to "CWR" in terms of both USB and LSB it doesn't make
> sense.

OK.  That should read (for clarity):

I then dialed up 4000.00 and verified CW + SPOT was zerobeat with the
birdy and that I showed exactly 600Hz beat tone on Spectrogram.

Next, I selected CWR and verified that it also was zerobeat using SPOT and
that it showed 600Hz beat tone on Spectrogram.

Next, I selected USB and dialed 3999.40.  I verified the 600Hz beat tone
in Spectrogram.

Next I selected LSB at 4000.60.  I verified the 600Hz beat tone in
Spectrogram. 


> 
> I may be wrong, but it sounds like you are adjusting the CW filters
> offset by 600 Hz (your pitch preference) from the correct frequency.

Nope.  I just didn't articulate properly what it was that I had done.

> An unmodulated carrier on exactly 4000.000 kHz should be heard with a
> pitch of 600 Hz when your K2 is tuned to exactly 4000.000 kHz (not to
> 4000.600 or 3999.400).  If your K2's VFO readout is accurate, it should
> read "4.000.00" when that received signal's pitch is 600 Hz, no matter
> whether your receiver is on CW or CWR.
> 

And that's exactly what it does.  4000.600 only produces a 600Hz beat tone
in LSB SSB, 3999.40 for USB likewise.

73 de John - KC4KGU
K2/100 #2490