Yep, I realize I was wrong. However I still think it is inherently
wrong to use a digital recorder to record the output of a CPO and then
replay it in an attempt to generate CW. What is the THD of the
resulting tone out of the digital player? How does that distortion
effect the eventual carrier that is output. It just seems a lot
simpler to simply key the transmitter chain and not have to worry
about the distortion of the modulation source, and the carrier and
opposite sideband suppression.
As Guy points out a digital radio can play some tricks to create the
CW -- but the initial message I responded to was about recording a
tone and replaying it into a SSB transmission chain. In my opinion
that just seems wrong. Yes, theoretically with a perfect sine wave for
the modulating source and perfect suppression the result will be the
same -- I was mistaken about that in my first message.
Mark AD5SS
On Tue, Feb 15, 2011 at 4:18 PM, Don Wilhelm <
[hidden email]> wrote:
> Mark,
>
> Actually, an SSB signal modulated by a single tone sine wave IS a CW
> transmission. There have been SSB transmitters commercially built which
> did exactly that for CW - but that was in times past.
>
> If the supressed carrier is sufficiently below the RF amplitude of the
> transmitted tone to meet the FCC requirements for spurs, then it is
> perfectly legal.
>
> Don't try that with an AM signal - that becomes MCW which is illegal for
> HF amateur bands.
>
> 73,
> Don W3FPR
>
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