The big limitation with today's solid-state amps is cooling and noise level.
I won't purchase a solid-state amp above the 1KW level until the cooling
technology improves.
Not sure if they do, but it would be interesting to try and obtain a no-time
limit (NTL) spec from SPE. I have the 1K-FA model and I suspect it's real
NTL output power is only a couple hundred watts. At 1KW output power, It
does very well with SSB, but struggles in CW with the fans quickly going
full-speed to keep adequate cooling. RTTY power would have to be scaled way
back if used in a RTTY contest.
Paul, W9AC
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Dennis W0JX via
Amps
Sent: Monday, May 18, 2015 1:19 PM
To: qrv@kd4e.com
Cc: amps@contesting.com
Subject: Re: [Amps] SPE 2K RTTY Duty Cycle
What I was seeking was how much "headroom" the SPE 2K has. I run my AL-800H
at no more than 1000 watts out on RTTY, usually chasing DX. I am not an RTTY
contester but I would like a new amp to have plenty of cushion so it is
cruising at legal limit. AFAIK, the tube Alphas and the ACOM 2000A will
provide this cushion. Apparently, today's popular transistor amps will not
(yet).
73, Dennis W0JX
--------------------------------------------
On Mon, 5/18/15, qrv@kd4e.com <qrv@kd4e.com> wrote:
Subject: Re: [Amps] SPE 2K RTTY Duty Cycle
To: "Dennis W0JX" <w0jx@yahoo.com>
Cc: "Dennis W0JX via Amps" <amps@contesting.com>
Date: Monday, May 18, 2015, 12:57 PM
PEP is not the same thing
as key-down RTTY by a long shot.
How many switches, feedlines, and antennas, external to the amp can
survive 1500w carrier for long?
Especially heating at imperfect and/or marginal contacts and connections?
I'm seeing estimates of 5
seconds, 10 seconds, and 15 seconds
of 1500w
output in RTTY continuous-duty mode - but unlimited at 1KW.
Most
vendors will be cautious about running-at-the-edge as they know that some
Hams will push that margin then blame them when something breaks.
Question:
Is
RTTY so inefficient that one really needs 1500w output?
There are many other
keyboard-keyboard digi modes that can
hold a
qso under poor conditions at 30-50w.
Just wondering ...
David KD4E
> I
asked this very question from one of the two SPE vendors at Dayton.
> I got very evasive responses
until I insisted on a plain and simple
>
answer. Finally, the vendor stated that if you start at 1500 w out on >
RTTY, the power will cut back to 1200 watts after ten seconds. I was >
disappointed in his rather defensive posture on the question of >
headroom. Yet there was a sign up that said the power out was 2000 > PEP
CW/SSB.
>
> 73,
Dennis W0JX
--
*David*
KD4E
ARES-EC Bulloch County, Nevils, Georgia USA
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