Gary Schafer wrote:
By "legal power out of the 813's" I assume you mean 375 watts carrier?
Why assume something that is false??
That statement is -designed- to put you on edge, Gary. Perhaps
it's just my perception, but it simply appears as if you're not
paying attention.
NO WHERE does it say that 375w of carrier is the 'legal' limit.
The LEGAL limit is 1500w PEP output. It's just a point of
reference, that if you modulate a 375w signal with a sine-wave to
100% audio, then you will reach 1500w pep output. The truth of
the matter is, we don't -speak- in sine-wave. Our voices are
rather asymetrical. Some of us have voices that are rather
'peaked'. In order for the audio amplifying equipment to
properly modulate 375w of carrier, instead of needing to only be
50% of the carrier, or 187.5w of needed audio, you -might- wind
up needing an audio system with the capability of producing
upwards of 600w of AUDIO.
(ref:
http://w5omr.shacknet.nu/~wa5bxo/asyam/Amplitude%20Modulation.htm)
THIS IS NOT TO SAY that you'll be pushing your positive peaks
that high, but in order to keep your signal clean, and well
within "good engineering practice", you certainly don't want any
flat-topping or distortion. Anything in the audio system that
does -not- allow your audio to be clean and free of distortion
then, by definition, wouldn't be operating within "good
engineering practice".
73 = Best Regards,
-Geoff/W5OMR
