-----Original Message-----
From: Jon Ogden <jono@enteract.com>
To: Scott Townley <nx7u@arrl.net>; Amps Reflector
<amps@contesting.com>
To: <amps@contesting.com>
Date: 13 June 1999 15:34
Subject: Re: [AMPS] 50-500 MHz in solid-state?
>
>>So, is the GBW the reason we don't see 50-500 MHz
solid-state amps?
>>Or are there devices available, but at ridiculous (from an
amateur
>>perspective) price?
>>Or is it some other limitation (like broadband matching
xfmrs at that freq)?
>>Or is it the next great product line?
>
>Not sure. But is there some silly FCC rule that gets in
the way because
>of the 6M limitations on amps? Or perhaps no one has
thought of it.
>
>Oh well.....
>
>73,
>
>Jon
>KE9NA
Electrically, it's fairly straightforward - modern FETs will
run 150-200W out off 28V with 13+dB gain across the band.
Last time I looked they were $200+ each, and not around
surplus. To all inents and purposes, they don't have a
wearout mechanism, so there's no 'pulls' market. Combining
over the frequency range is a pain, so the upper power limit
is that of a single device in most cases.
Basically, there are many compromises needed to makes
something so braodband, and you tend to end up with
something that has mediocre efficiency and linearity
performance everywhere.
Steve
--
FAQ on WWW: http://www.contesting.com/ampfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|