Fundamentally, a carrier is a carrier. A CW carrier
is modulated on/off, while an AM carrier is constant
(for the duration of the transmission that is).
However, the peak output power for a given transmitter
is fixed. For many rigs, this is 100W peak output
power.
Now, a CW signal is nothing more than a carrier, so a
CW signal can be the full 100W. Not so for an AM
signal: there is a voice component also. If the
carrier was 100W, then there would be zero power left
for the voice signal. [Signal power adds directly in
this fashion.] It's been a while since I've read up
on this, but the maximum numbers is 1/2 of the
available power goes to the carrier, 1/2 of the power
goes into voice--which is actually 1/4 of available
power goes into each sideband. [This is why SSB is so
much more efficent--far more power can go into just
one sideband, none lost to a carrier.]
That answer the question?
Shawn
KB1CKT
--- john ferro <foxbat426@hotmail.com> wrote:
>
> actually you have not helped me out - you still have
> not answered the question - whats the difference
> between an am carrier and cw carrier? if it's the
> same as some people say why on a japanese radio the
> am carrier is only 25 to 50 watts (depending on the
> radio) when the mic is keyed vs. 100 watts on the
> same jap radio cw mode keyed down - all assuming swr
> is 1? i understand the swr fold back issue.
Shawn Upton, KB1CKT
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