The average power of a 100% modulated 4 watt carrier is 6 watts, not 4.
(If you want to look at it in the frequency domain, where the total
power has to be the same as in the time domain, you've now got the
original carrier plus two sidebands. The power in the two sidebands
totals 2 watts.) And I'd give the answer to Chris' two questions as yes.

Roy Lewallen, W7EL

Paul Burridge wrote:

On Wed, 20 Oct 2004 12:08:59 GMT, "Chris"
wrote:


Paul,

I've been following the thread still. Let me go back to the original
question for a moment. So is the 4W maximum power of a CB radio is actually
average power, not RMS, right? If it is modulated at 100% with a sine wave,
what wil the PEP be? Is 16W the correct answer?


AIUI the specified 4 Watts is the maximum*average* power allowed (in
the UK, anyway). When you modulate it 100% AM., it's still 4W average
power. If you fully modulate it with FM., it's *still* 4W average
power. But as you've seen here, for every assertion, there's a
contradiction. ;-)