We took an Ameritron ALS600S with us to Malta for the SSB contest this month
(9H3DX). The power limit for 9H is 400 watts so this amp was perfect. The
whole thing with cables and 100' RG8X coax was packed in a hard shell case
and weighed just under 50 pounds. We made quite a few contacts on 80 using
a Force 12 Sigma 80 vertical. Without the amp it is doubtful we would have
made more than a handful of Q's.
73, Keith NM5G/9H3KD
9H3DX Team Malta (http://www.tdxs.net/)
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Ian White GM3SEK
Sent: Friday, March 17, 2006 1:53 PM
To: amps@contesting.com
Subject: Re: [Amps] HV switching power supplys?
>Are you against using a transformer, rectifier and filter?
>
>Is weight a problem?
>
>Hal
>W4HBM
>Oh no, I'm just curious as to how this is progressing. The thread on
>MOT's prompted the renewed interest. So many very clever fellows out
>here, I was sure somebody has a design in the works. Sure would make
>things nice from a shipping standpoint, so I'll bet they have been
>working on these in the East.
>
The increasing number of "vacation DXpeditions", along with declining
sunspot numbers, means the demand for lightweight, reliable power
amplifiers is stronger than ever before.
Everybody can run 100W, so it isn't worthwhile to take an amp that only
gives 200-300W. The entry level is now at least 500W.
Reliability is also vital, when someone has hauled this thing halfway around
the world, and has staked their reputation (and yours) on it being able to
deliver.
Solid-state HV switchers for tube amps share some of the same problems as
pure solid-state power amps: everything depends on a small number of power
devices that are being worked very, very hard.
We're still looking a way to break out from "Lightweight, reliable, power -
pick any two."
--
73 from Ian GM3SEK
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