[Amps] SPE 2K RTTY Duty Cycle

[Roger (K8RI)]

And they get the IM3 down 40db or greater

73

Roger (K8RI)


On 5/18/2015 1:47 PM, Paul Christensen wrote:
> 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 at contesting.com] On Behalf Of Dennis W0JX via
> Amps
> Sent: Monday, May 18, 2015 1:19 PM
> To: qrv at kd4e.com
> Cc: amps at 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 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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