[ARC5] AM modulating an "ARC-5" transmitter...

[Kenneth G. Gordon]

On 10 Oct 2015 at 18:02, D C _Mac_ Macdonald wrote:

> Just for a refresher, am I not correct in stating that FCC rules state a maximum
> of 1500 Watts Peak Envelope Power (PEP) OUTPUT? 

That is as I understand it, yes.

> For extreme case of 75% efficiency in a Class C, high-level, 100% modulated AM
> signal, a 500 W carrier input final would give peaks 4 times the carrier output.

Supposedly, yes. However, I suspect that would only really take place with a 
sine-wave input, and not your average voice.

> Then 375 Watts (1500 Watts) meaning a "half gallon" transmitter would 
pass muster.

It would appear to be so, yes. I mentioned 275 watts in a previous e-mail, but 
I was wrong. It is 375 instead.

> If you assume 70% efficiency, then a carrier input of 535.71 Watts would be
> "kosher." 

Again, yes.
 
> Any carrier input less than the above would certainly not get you cited by FCC
> if they actually did an inspection. 

Yup.

> Lots of "straining at gnats" going on here! 

Yes. :-)

Ken W7EKB