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@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@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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>
>
>
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