Another requirement must be repeatable or adjustable phase and power
control. unless you are planning to have an output sample feedback to your
phase shift and power divider network to compensate for differences in the
amps and different loading from coupling to other array elements and
surrounding stuff externally.
David Robbins K1TTT
e-mail: mailto:k1ttt@arrl.net
web: http://www.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
> -----Original Message-----
> From: towertalk-bounces@contesting.com [mailto:towertalk-
> bounces@contesting.com] On Behalf Of Jim Lux
> Sent: Friday, March 04, 2005 14:38
> To: Towertalk
> Subject: [TowerTalk] amplifiers for phased arrays
>
> I've been looking around for amplifiers for a multiple amplifier setup for
> a
> HF phased array (one where there's an amplifier for each element). Power
> output per amp should be in the 200-400 W range. The ideal amp would have
> total remote control (especially for bandswitching) and would have a ton
> of
> gain (I'd like 20+dB (few watts in for several hundred out: not
> withstanding
> the anti CB-linear rules). Solid state seems to be preferable (physical
> durability, mostly.. ) The power output needs to be in the few hundred
> watts range (per amp). Various and sundry amps that use a raft of modules
> and power combine them are a non-optimum solution (why not let the
> combining
> be done in free space, and save the loss).
>
> So far, it seems that there are the following:
>
> Various models from Tokyo Hi Power (100 and 200W outputs) which have a
> bunch
> of gain (1-2 W in, for rated power out)
> MFJ has a pair of solid state amps(500W bipolar and 600W FET), but both
> require manual bandswitching
> SGC has a remote controllable 500W amp (presumably about 10dB gain,
> although, maybe you can drive it to rated output with the 20W output of
> the
> SGC2020)
> Henry Radio might have one
> Codan (Australia) probably has one or more
> There are some obscure(in the US) Italian mfrs, but I haven't been able to
> find out much about performance (are they "CB amps"?)
> A whole raft of CB amps of one sort or another, of dubious provenance and
> design (I'm sure some of them are actually reasonably good, but there's no
> way to really tell).
>
> Anybody know of others?
>
> Jim W6RMK
>
> _______________________________________________
>
> See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
> Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with
> any questions and ask for Sherman, W2FLA.
>
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_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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