[Amps] Emergency communication

[Roger (K8RI)]

Agreed!

73, Roger (K8RI)

On 5/1/2017 2:59 PM, Manfred Mornhinweg wrote:
> Roger, and all,
>
>> Without a lot of compression and clipping the duty cycle for SSB is 
>> only 20%. Given 100W out at 60% efficiency, we are looking at roughly 
>> 167W input at the 20% duty cycle or roughly 34 watts.
>
> Small but important correction: If you have a 100W amp that has 60% 
> efficiency, then this efficiency is valid ONLY at 100W. At any lower 
> power the efficiency is lower too. Used in SSB at an average output of 
> 20W, its input power will be far more than 34W. More like 80W, in fact.
>
> Instead a high efficiency amplifier like an EER design will largely 
> maintain efficiency over the entire power range. So that a 100W EER 
> amplifier might need 120W input for 100W carrier output, and maybe 25W 
> average input for 20W average output on SSB.
>
> That's the biggest advantage of using high efficiency amplifiers. Not 
> going from 60% to 80% efficiency at full carrier output, but going 
> from 25% to 80% average efficiency on SSB!
>
> Manfred
>
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