[Amps] Odd efficiency shift on 80m band

[Jeff Blaine]

Hi Don,

Thank you for pointing this out.  And I agree with your point that 80m 
shares the largest percentage change of all the bands. 

What I'm really after here is to discover possible additional sources of 
the efficiency change - because alterning in the frequency dependent 
components do not really seem to impact the slope of the curve.

Perhaps someone would like to run the similar test on another amp to see 
how results look across the band on another amp.

73/jeff/ac0c

n8de at thepoint.net wrote:
> We all seem to forget that the 80m band has the largest % of range of 
> all the HF bands.
>
> 160m = 1.8 - 2.0 = 11% bandwidth
> 80m = 3.5 - 4.0 = 14% bandwidth
> 40m = 7.0 - 7.3 =  4% bandwidth
> 30m = 10.1 - 10.15 = .5% bandwidth
> 20m = 14.0 - 14.350 = 2.5% bandwidth
> 17m = 18.068 - 18.168 = .6% bandwidth
> 15m = 21.0 - 21.450 = 2.1% bandwidth
> 12m = 24.89 - 24.99 = .4% bandwidth
> 10m = 28.0 - 29.7 = 6% bandwidth
>
> With such a large bandwidth %, it is no wonder that circuit designs 
> just don't work 'flat' across the whole band.
>
> I'll leave it to the experts who can talk about Q, etc .. across that 
> band.
>
> Don
> N8DE
>
>
> Quoting TexasRF at aol.com:
>
>> Just curious: is the lowered efficiency because power output is 
>> reduced or
>> because the plate input power has increased, or a combination of both?
>>
>> 73,
>> Gerald K5GW
>>
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