Most modern commercial transceivers effectively generate CW as SSS MCW.
I think the K3 does it at about 15kHz or less, which is within the
audio range. I suppose the K3X could generate it directly, by just
keying the I signal to the modulator; however, that would mean moving
the VFO between transmit and receive, at the QSK rate. (Keying I on the
K3 would probably be a bad idea, as it would mean that any transmit
roofing filter would need to pass the first LO frequency and therefore
be subject to some carrier leak when key up, so I presume that the CW is
actually synthesized as fully fledged MCW. Even if it keyed I, you
could treat that as MCW with a side tone of 15kHz.)
Even the K2 architecture is effectively an MCW one, but in that case the
initial tone is in the MHz range.
--
David Woolley
Registered owner K2 06123
Joe Subich, W4TV wrote:
Keyed sidetone, also known as "modulated CW" is of questionable legality
below 50.1 MHz. It is also poor engineering practice and generates
significant QRM due to carrier leakage, noise/hum modulation,
clipping, and "open mic" noises when a microphone is also connected to
an SSB transmitter at the same time (as it would be between the
dits/dahs).
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