Hi Rich - a very lucid reply, and you apparently understood what I was
saying, despite my "RIT" mis-statement.
For some reason, I was operating under the mistaken impression that the
sideband used for CW followed the sideband convention for SSB. I went
straight to the Cady book, unfortunately - had I referred to page 30 of
the regular manual, I would have seen that normal for the K3 in CW is
lower sideband on all bands. I wonder if this is generally true of
modern transceivers - seems to me as if my TS-930 and Mark 5 - both now
gone - switched CW sidebands as I described above.
Again, many thanks.
73, Pete N4ZR
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On 2/19/2013 9:18 PM, Richard Ferch wrote:
Hi Pete,
In CW mode, the K3 reads the actual transmitted frequency. Since
normal CW uses lower sideband on the K3, this means that on 3507.2 in
normal CW mode, with the pitch set at 500 Hz the suppressed carrier
frequency is 3507.7 kHz (500 Hz above the signal frequency). If you
change the pitch setting to 300 Hz, the K3 adjusts its suppressed
carrier frequency to 3507.5 kHz so that the transmitted frequency
stays on 3507.2 kHz.
If you were using CW-R on upper sideband, the suppressed carrier would
be at 3506.7 kHz with 500 Hz pitch, and on 3506.9 kHz with 300 Hz pitch.
RIT has no effect on what the other station hears. However, if you use
both RIT and XIT together, it will have an effect - exactly the same
effect as if you rotated the tuning knob to produce the same tone in
the receiver and the same frequency display in the VFO A display.
If you are using the K3's normal CW mode, you tune "zero beat" to a
station (i.e. so that what you hear is the same as your sidetone), and
then you tune your VFO lower in frequency, the receiver's carrier
frequency moves lower and gets closer to the signal you are receiving,
so the pitch you hear goes down. If you now transmit with that lower
VFO frequency, your signal will be lower in frequency than it would
have been on zero beat, and therefore lower in frequency than the
other station's signal. If the other station is also a K3 using lower
sideband for CW, he will hear your pitch go up, because your signal is
farther away from his suppressed carrier frequency. On the other hand,
if the other station is using upper sideband for CW he will hear your
pitch go lower.
In general, if you are both using the same sideband, then when you
move your main VFO (or RIT-XIT together) to change the pitch you hear,
that will make the pitch the other station hears change in the
opposite sense. If you are using opposite sidebands, what you both
hear will change together. Since it is in general impossible to
predict which sideband the other station is using for CW, it is
likewise impossible to predict with certainty what he would hear if
you were to adjust your transmit frequency slightly.
73,
Rich VE3KI
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