[Amps] Alpha &&DX Conversion

[Vic K2VCO]

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/