[Amps] Alpha &&DX Conversion

[Paul Christensen]

Vic,

Valid point but the FCC- registered efficiency was 58% and is typical of an 
FM broadcast GG design.  The AEL FM 2.5K is a GG design and not 
tetrode-based as were the more common FM broadcast transmitters.

Paul, W9AC

----- Original Message ----- 
From: "Vic K2VCO" <k2vco.vic at gmail.com>
To: <amps at contesting.com>
Sent: Wednesday, September 05, 2012 5:57 PM
Subject: Re: [Amps] Alpha &&DX Conversion


> 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
>> Amps at contesting.com http://lists.contesting.com/mailman/listinfo/amps
>>
>
> -- 
> Vic, K2VCO
> Fresno CA
> http://www.qsl.net/k2vco/
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