[Elecraft] K3/K3s: Question(s) CW via audio into SSB transceiver

[Fred Jensen]

All the discussion raises a couple of questions for me:

I believe [but do not really "know"] that Collins began this with the 
KWM-2/2A and the S-Line.  The key line keyed an audio oscillator which 
must have been very sinusoidal and free of noisebecause the CW spectrum 
was very clean.  Is this true?

When I run RTTY here at home [K3], I use AFSK from MMTTY and the 
computer sound card.  I've looked at the spectrum and it's very clean. I 
was under the impression thata single frequency from a sound card is 
very sinusoidal with very low harmonic content and other artifacts given 
that it's constructed from a nearly exact data stream.

I know about the Windoze noises, mine are turned off.  If it works for 
RTTY on my K3, why wouldn't CW also work equally well?  My sidetone is 
set at 580 Hz, a sweet spot in otherwise lousy hearing. If I'm on USB 
with someone and send something on CW, I think he hears it at 580 Hz.  Yes?

73,

Fred ("Skip") K6DGW
Sparks NV USA
Washoe County DM09dn