Someone help me here. Are these Henry sold-state amplifiers "linear" or of
another type which operates under a different class of efficiency? If these
are truly "linear" amplifiers, shouldn't the gain be reasonably constant,
regardless of the input power...at least up to the point of its maximum
ratings?
-Paul, W9AC
-----Original Message-----
From: Ed Dial <diale@mindspring.com>
To: rakefet@rakefet.com <rakefet@rakefet.com>; Amps reflector
<amps@contesting.com>
To: <amps@contesting.com>
Date: Monday, May 08, 2000 9:26 AM
Subject: Re: [AMPS] SS750 output -- more tests
>
>Vic,
>
>Mine does exactly the same thing! I would be interested in anything you may
>find out.
>
>
>
>At 07:35 PM 5/7/2000 -0700, Vic Rosenthal wrote:
>
>>I'm still trying to figure out why I can only get about 600 watts output
on 14
>>MHz from my Henry SS750 amplifier (8 x 2SC2879).
>>
>>I measured the output into the dummy load with various levels of drive,
>>from 10
>>to 100w in 10 w steps. I found the following relationship:
>>
>>In Out
>>--- ---
>>10 113
>>20 216
>>30 305
>>40 384
>>50 427
>>60 482
>>70 520
>>80 540
>>90 570
>>100 601
>>....
>>150 687
>>
>>Obviously, the gain drops as the power increases. Is this normal?
>>
>>I did some research, and the 2SC2879 is rated at 13 db gain (minimum) at
>>28 MHz.
>>with only 12.5v on the collector. The attenuator that's in the Henry
>>circuit on
>>14-28 MHz is only 2 db. That should leave 11 db gain. Allowing for 2 db
of
>>loss in the splitter, combiner, and filter, that leaves 9 db, which should
>>produce 800 watts with 100 watts drive. One would expect even more gain
with
>>13.8v.
>>
>>Something isn't right...I think. I am not a solid-state guy -- help!
>>
>>73,
>>Vic, K2VCO
>>Fresno CA
>>
>>--
>>FAQ on WWW: http://www.contesting.com/ampsfaq.html
>>Submissions: amps@contesting.com
>>Administrative requests: amps-REQUEST@contesting.com
>>Problems: owner-amps@contesting.com
>>Search: http://www.contesting.com/km9p/search.htm
>
>
>
>
>
>
>
>ARS - WA4RYW
>Grid DM79nj
>
>NEW KEY 01/15/1997!
>
>
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>
>
>The box said "Requires Windows 95/98, NT, or better", so I installed Linux.
>
>It is estimated that 3.71 X 10^10 "first-star-tonight" wishes
>have been wasted on Venus.
>
>---------------------------------------------------------------------------
---------------------------------
>Ed Dial
>Castle Rock, Colorado USA
>---------------------------------------------------------------------------
---------------------------------
>[]
> Are you ready?
>
>
>--
>FAQ on WWW: http://www.contesting.com/ampsfaq.html
>Submissions: amps@contesting.com
>Administrative requests: amps-REQUEST@contesting.com
>Problems: owner-amps@contesting.com
>Search: http://www.contesting.com/km9p/search.htm
>
--
FAQ on WWW: http://www.contesting.com/ampsfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
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