Date: Sat, 10 Sep 2016 11:14:26 -0400
From: "Paul Christensen" <w9ac@arrl.net>
To: <amps@contesting.com>
Subject: Re: [Amps] Acom 2000A - typical output power?
>"I owned a 2000A at one time not to mention many other amps over the years.
If you run it at 1500 watts RTTY contesting, it will over heat after a
while, about 10-15 minutes as I recall."
Bill, was that with or without the externally-mounted muffin fan as an
assist to the blower? My 2000A was purchased in 1999 and the fan was an
option at the time. It was probably standard equipment in later models.
During my 12 months of ownership, the 2000A was never used on RTTY -- so you
bring up a good point.
There's an Alpha 9500 at a remote internet site owned by myself and N4CC.
It's a great amp for this purpose. We use the internal RF switch as an
antenna selector and AlphaMax mostly keeps tuning where it should be
although from time-to-time, we see a lot of "hunting." However, it's an amp
I would not have on my home desktop: too much blower noise and the T/R
relays are ridiculously loud. My 2000A was very quiet in operation although
perhaps that may be one reason why it's sub-par on RTTY.
Paul, W9AC.
## I though the 9500 used small RJ1-A type vac relays ??? Those things
are not loud. If shock mounted you cant even hear em. If they use one vac
realy on the output side..and a reed relay on the input side, that too would be
quiet..or should be. The blower noise is another matter. I think on the
ameritron
8877 amps, the fan speed can be wired for several different speeds. Of course,
for rtty contesting, the blower is gonna make a lot of noise. If the 9500
blower
is one speed, full bore, the best you could do is perhaps relocate the amp, or
place sound deadening material around it.
## for 1.5 kw out, you require 2.5 kw input..assuming 60% eff. Thats 1 kw
CCS
of diss..which is a bunch.
Jim VE7RF
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