[Amps] SPE 2K RTTY Duty Cycle

[Michael Alexander]

I can run my 2K indefinitely at 1500W in a  72 degF room and with the 
cooling in the default configuration.

Please contact me offline if you would like to discuss this in additional 
detail.

73 de Mike -N8MSA

Sent from my mobile device.



On May 18, 2015 11:19:42 AM Dennis W0JX via Amps <amps at contesting.com> wrote:

> 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 at kd4e.com <qrv at kd4e.com> wrote:
>
>  Subject: Re: [Amps] SPE 2K RTTY Duty Cycle
>  To: "Dennis W0JX" <w0jx at yahoo.com>
>  Cc: "Dennis W0JX via Amps" <amps at 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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