[Elecraft] Point me to the note for sending CW when in, SSB mode

[Vic, K2VCO]

I wish people would stop using the term 'MCW' for the method of 
producing CW by feeding a (one hopes) clean audio tone to an SSB 
transmitter. This is a way of generating CW -- which may or may not be 
the best way -- but it is not MCW.

MCW as it has always been understood is a carrier modulated at an audio 
frequency -- an AM signal. The signal is keyed on and off to transmit 
Morse information, but it has two sidebands on either side of a carrier. 
If the tone is, say, 600 Hz, then the signal will be at least 1200 kHz 
wide.  It is illegal in our HF CW bands.

MCW was used in past years for maritime communication because it can be 
received by a receiver without a BFO and there is no 'zero beat' 
phenomenon which could cause a listener to miss a signal.

On 6/15/13 3:40 AM, David Woolley (E.L) wrote:
>
> 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.
>

-- 
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/