I wonder if this explains something I ran into during FD. On several occasions
– usually late at night – I was able to do some running, all on CW. Five or
six times over several hours I heard stations calling me way off my frequency.
It seemed like a Khz or more, though I didn’t measure it at the time. They
were outside the passband and I heard them only when, after a CQ, I tuned the
RIT widely on either side. I wondered why that would be happening. I
certainly wasn’t the target of a pileup. One possibility I thought of was that
those callers had forgotten to cancel split after the last time they intended
to use it. But this thread about audio tones keying CW on SSB suggests
another. Is it possible that they were using CW keying on USB or LSB which
resulted in a frequency offset of, typically, 600 (or, as Don suggests, 1200)
Hz? If so, it seems like it wouldn’t be a great strategy during a contest on a
crowded band.
Ted, KN1CBR
------------------------------
Message: 22
Date: Fri, 30 Jun 2017 00:20:39 -0400
From: Don Wilhelm <[email protected]>
To: Terry Brown <[email protected]>, [email protected]
Subject: Re: [Elecraft] Fldigi and signallink question interfaced to
KX3
Message-ID: <[email protected]>
Content-Type: text/plain; charset=utf-8; format=flowed
sorry about the blank response. It is late here and the fingers do not
work well.
Fldigi uses audio tones for keying, and you need to be in SSB mode
(typically USB or DATA A) to transmit on the proper frequency - CW
included - but I would expect twice the sidetone pitch.
Use DATA A mode when trying to send CW via the Fldigi CW mode.
CW is "just another digital mode" although one that can be decoded by
the human brain for those who know morse. It uses audio tones to send
CW, do the carrier frequency USB frequency will be the transmit
frequency plus the frequency for the sidetone in Fldigi.
73,
Don W3FPR
On 6/29/2017 11:26 PM, Terry Brown wrote:
> I have a KX3 connected to a Signalink and Fldigi. It seems to work fine
for
> all the digital modes. I can use it to decode CW, but have never sent CW.
> I clicked on the CQ button and all that happened was that my transmitter
> went into transmit mode, but nothing was transmitted. If I put the KX3
in
> LSB it would transmit cw fine, but was always off frequency by the amount
of
> my sidetone.
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