[Elecraft] Freq calibaration

Mon May 5 19:58:03 2003

Dan, what you are listening for is a change in amplitude rather than a
change of frequency so any filter width which can pass 600 cycles (if
that's what your spot tone is set for) should work fine.  The amplitude
changes become slower and slower until, in theory, there are none when
you're exactly at zero beat (hence the name - - zero beat).  I am now
wondering if Spectrogram might be useful for this as well as calibrating
filters.  You should be able to see the amplitude variations on screen
and they may be easier to detect that by just listening.

Bruce - W8FU

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Daniel Reynolds
Sent: Monday, May 05, 2003 10:29 AM
To: john FRANCIS; [email protected]
Subject: Re: [Elecraft] Freq calibaration

I think (and I could be wrong) that you might have problems in LSB and
USB
trying to zero beat if your SSB filter settings aren't wide enough to
cover the
lower (audio?) frequency range... but that's only a guess. I believe I
may have
my SSB filter wide enough to actually sense zero beating on both sides
of the
carrier when in either USB or LSB - but that may be because I set my
default
filter for 2.4 kHz and shifted it down quite a bit lower so that in
Spectrograph it appears to cover nearly 0.0-2.5kHz.

- Daniel/AA0NI