[Amps] transformer duty cycle

[Carl]

SSB with a processor runs around a 50% duty cycle. A 60-65% CCS rating of 
key down CW should be fine. Use a small fan, its cheap insurance. Some of 
the smaller amps use a 40% rating.

The Peter Dahl Alpha 77SX with two 8877's transformer is rated at 60% of 
CCS. It weighs 49# and is a Hypersil design.

My 7500W CCS modulation transformer weighs 145kg!!

Carl
KM1H



----- Original Message ----- 
From: "Felipe Ceglia" <felipeceglia2 at gmail.com>
To: <amps at contesting.com>
Sent: Tuesday, December 08, 2009 5:01 PM
Subject: [Amps] transformer duty cycle


> Hi Folks,
>
> While making price quotations for the transformer for y 2 4cx1500b amp, 
> the
> guys often asked me  what its duty cycle would be.
>
> I dont know what exactly this changes in a transformer, but I imagine that
> that might have something to do with why some ham radio amps are so small
> and lightweight. hihi
>
> One of the quotes was rated at 3200v 2.5amp 140kilogram (the guy said they
> would use good qualitty core material, grain oriented)
>
> What duty cycle should I specify for CW/SSB contesting? Assuming that this
> would be a running station, with enless CQs...
>
> 73 and thanks for your patience,
>
> Felipe - PY1NB
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