Ted, Fred et al;
As a rule using the SSB mode to send CW is very risky at best. Any hum
or distortion, meaning the smallest amount, on the CW generated audio
signal will produce harmonics of the fundamental audio tone . These
will pass through the SSB generator and sideband filter and thus be
transmitted. {i.e. - 700, 1400, 2100, 2800 Hz} Probably at levels in
excess of the FCC regulation on signal purity. Not to mention
upsetting your band neighbors around your frequency.
The earlier references I made to using FLDIGI and a Signalink USB
interface, FLDIGI does generate CW audio. It is this audio signal
which activates the relay in the Signalink USB, thus it is a relay
which is performing the function of keying the radio in CW mode. No
different than a straight key. In this case, the radio MUST be in the
CW mode, the Signalink USB Delay set fully counter clockwise to
minimum. Even then, the speed of the associated circuits and the relay
close and open time will limit CW speed to less than 20 WPM or so.
Other software applications may behave differently when connected direct
to the radio or via an interface device. No one rule stands for all
configurations.
73
Bob, K4TAX
On 7/3/2017 3:00 PM, Fred Moore wrote:
Ted, it's not a great strategy any time, and yes most likely that is
what was going on. You should see their signal when they have RF on the
audio or a hum. Not exactly meets the FCC requirements. If you are
listening with a wide filter some times you even get to hear their
Microsoft Windows generated tones if they forget to turn them off.
Let the flood gates start with all of the "you can't tell the difference
so it's ok" But I can and have seen it many times with bad signals..
It's not CW keying, its USB or LSB keying with a single tone. It makes
me crazy when someone calls it CW keying, no way it is
Fred
Fred Moore
email: [email protected]
[email protected]
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