[Elecraft] BFO Dumb Question

Sat Mar 2 20:32:00 2002

Jason:
  Which filter are you hearing this on?  Is this true only of your broadest 
filter?  And is this the OP1 filter from the ssb board?  In any event, it 
sounds like you simply haven't adjusted your BFO properly.  I will assume 
it is only the broadest filter causing problems.  If you have spectrogram, 
adjust this filter so that your sidetone is down in the lower part of the 
passband, maybe the lower third. With spectrogram, you will be able to see 
the lower skirt of the passband.  This should be above zero Hz so you won't 
hear much below zero. If this is the OP1 ssb filter, you might start using 
the bfo setting given in the ssb manual.  This is really pretty good, and 
should avoid the problem you are getting.  For further suggestions, one 
would need to know what filter is causing the problem.

best wishes,

dave belsley, w1euy

--On Saturday, March 2, 2002 7:57 PM -0500 Jason Hissong 
<[email protected]> wrote:

> I have a silly question...
>
> I notice that tuning up and down the CW subbands, I here the CW signal on
> both sides of the BFO frequency.  For example, tuning up the band, say I
> start on 7022.0.  I start to hear a CW signal at 7022.44.  I keep tuning
> up and I can zero beat him at 7022.71. Tuning up, the CW signal
> disappears at 7023.4.  I zero beat him again on 7023.93.  Then disappears
> again at 7024.5. Which side is he on?  (i.e., which frequency is he
> transmitting on).  I think 7023.4.  If that is the case, which side of
> the BFO should I zero beat on him?  I understand what the BFO does and
> what I hear in the speaker is the difference BFO frequency.
>
> I do not know why I have never thought of this before.  I think in the
> past, I zero beat on the higher frequency (in my example, it would be the
> 7023.92) without giving it much thought.
>
> Sorry for the completely silly question... you can reply direct to me...
> (including flames :)
>
> Thanks
> Jason N8XE
> K2 #1270
>
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----------------------------
David A. Belsley
Professor of Economics