On Apr 3, 2006, at 7:00 PM, <exray@bellsouth.net> wrote:
> 4CX250B tubes will reliably run 500W out for a pair( observe the
> AN/URC-32 or its commercial cousin the KWT-6). If you must have more
> try three, as I recall, (AN/ARC-58 or TRC-75). This was 1 KW output
> autotune on the back of a jeep.
>
> These military radios had to operate under rather stringent (read
> horrible) conditions. And guess what....these " relics " did just
> fine!
The military typically used 4cx250Rs because they were Ruggedized and
they could withstand mechanical shock better than the plain vanilla B
version.
>
> Yes there are better tubes available today...but the old 4CX250 family
> is the granddaddy of all of them. If you come across a pair, and they
> should be inexpensive, there are many good designs which have been
> published thru the years.
>
> Frankly, I doubt you could tell the difference between 3 4CX250Bs and
> an 8877
3db is about it.
> except for the rattle of the change still in the pocket of the guy
> with the 4CX250B rig! He can then spend money on an antenna and feed
> line where it really counts!
As I see it, a db is a db, whether one gets it in the antenna or in the
amplifier. Also, at some point, excepting moonbounce, more
directivity in the antenna and/or a lower angle of radiation is
counterproductive.
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>
Rich Measures, 805.386.3734, AG6K, www.somis.org
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