[Amps] FT8 power with the KPA1500

[Jeff Blaine]

I don't know about 100% ICAS.  But I can say from personal experience, 
the KPA1500 is able to withstand years of RTTY contest duty without a 
problem, other than a lot of fan noise when it really gets warmed up good.

Can't say anything with respect to proper levels on FT8 as I don't run 
the mode.  But the logic of reducing the power may not actually provide 
any benefit TO THE AMP.  If I remember right, the amp's disipation was 
about the same at 500W or 1KW as at 1500W. Can't remember but that would 
be one thing to check.  Dialing back on the Po does not mean you are 
getting a corresponding drop in Pd.

Good luck.

73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com


On 7/10/21 11:43 AM, jim.thom jim.thom at telus.net wrote:
> Date: Wed, 7 Jul 2021 18:15:50 -0700
> From: Richard Solomon <dickw1ksz at gmail.com>
> To: "amps at contesting.com" <amps at contesting.com>
> Subject: Re: [Amps] FT8 power with the KPA1500
>
> <100% ICAS ????
>
> <Isn't that a contradiction of terms ??
>
> <73, Dick, W1KSZ
>
> ##  I'm trying to wrap my head around...  100%  ICAS !
>
> ##  IMO, elecraft should have provided for at least one lower vdc, and
> probably 2  lower vdc's.   Then one could run 1 kw PO..with much greater
> eff, and less heat.   Or  say  500w  po,  using the very lowest vdc.   The
> SPE and also the UK  SS  amps both have  3 x vdc's to choose from.
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