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Re: [Amps] Alpha 9500 Repair

To: amps@contesting.com
Subject: Re: [Amps] Alpha 9500 Repair
From: Kevin Stover <kevin.stover@mediacombb.net>
Date: Tue, 15 Sep 2015 18:53:44 -0500
List-post: <amps@contesting.com">mailto:amps@contesting.com>
W6PQL has built a 1KW SSPA for 1.8 though 54MHz using a single BLF188XR's. They are dual transistor parts. He suggests that two such LDMOS parts throttled back to 750W per along with his splitter/combiner and LPF board would do the legal limit all day, cleanly.

You're going to need a 50V power supply capable of 70A all day.


On 9/15/2015 10:10 AM, Bill Turner wrote:
------------ ORIGINAL MESSAGE ------------(may be snipped)

On Mon, 14 Sep 2015 23:57:41 -0700, you wrote:

Aside  from that, they really should have designed it,
such that components don’t blow up with a simple cathode to grid
short, int or hard fault.

Jim   VE7RF
REPLY:

Agreed. Arc protection is a weak point.

I have owned two 9500's. The first one, about four years ago, arced
when it was a few months old and blew out the 40 volt supply. The
factory repaired it under warranty and even paid for shipping both
ways. My second one, a used one less than a year old, has been
flawless so far, but I see the factory no longer pays shipping if it
fails under warranty.

I'm hoping Alpha cones out with a brick-on-the-key solid state amp.
Done right at the right price, that would be a world beater. A pair of
BLF188XR's costs about a third of an Eimac 8877 and is rated at 2800
watts PEP. Going with four of them to be conservative would be my
suggestion and still costs less than an 8877. No warm up, no tuning
but does need an antenna tuner.

If Alpha is not interested, here's an opportunity for an entrepreneur
to start a new world class company in their garage. The technology is
already known, it just takes someone to put it to work.

73, Bill W6WRT
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--
R. Kevin Stover
AC0H
ARRL
FISTS #11993
SKCC #215
NAQCC #3441

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