Paul,
Don't forget that the FM transmitter was probably running class-C which might be 75%
efficient compared to the 60% or so available in class AB1/2.
On 9/5/2012 2:48 PM, Paul Christensen wrote:
"I will tell you why i run a 2 tuber, you put in 25 watts in and do 1500 easy
not
push a one tuber to do 1500 out. it all comes down to what you can afford. bill
73"
This may be an interesting point of reference. During my college years, I
worked at a
3KW FM station in Rockford, IL as its chief engineer. The transmitter was an
AEL
FM-2.5K (FCC type accepted to 2.5KW output) and used a single 8877 to produce
2500-watts output at 104.9 MHz. All day long, every day, 365 days a year. A
three-bay circularly polarized antenna brought ERP to 3KW.
If a 77Dx is running intermittent amateur-class service but under high
duty-cycle modes
like RTTY at 1500-watts output (the U.S. legal limit, for example), I think its
reasonable to assume that a 8877 is already operating with sufficient headroom
of
roughly 1KW. For what purpose do any of us need more than 1KW of headroom
from our
vacuum tubes when producing 1.5KW?
Paul, W9AC _______________________________________________ Amps mailing list
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--
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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