[Amps] RL Calculations

[Carl]

----- Original Message ----- 
From: "Phil Clements" <philc at texascellnet.com>
To: "'Amps Reflector'" <amps at contesting.com>
Sent: Monday, April 27, 2009 12:35 AM
Subject: Re: [Amps] RL Calculations


>
> Subject: Re: [Amps] RL Calculations
>>
>> Plus, if the Q strays a little from the current favored 12, who 
>> cares.
>>
>> Bob W6TR
>
> I am so glad that when I built my 3X3 single-band (160 meter) amp I 
> used a
> 20 uh tank coil as L1 in a pi-l configuration. This came out to be a Q 
> of 6.
>
> For over 15 years, I take a few hours in October to clean and lube the 
> amp.,
> and then tune it up on 1825 KHz. I never touch the thing again until 
> the
> next October. The lower Q allows QSY'ing +/- 15 KHz without having to 
> fiddle
> with the knobs. My other amp is a Harris RF-110, which has no tuning
> controls at all!
>
> (((73)))
> Phil, K5PC
>

Some years ago I compared the output of a NCL-2000 with a Q of 8  with a 
LK-780 and a Q of 12. Both were straight pi networks. Using a ICE LPF I 
couldnt tell any difference in harmonic content on a HP spectrum 
analyzer. Both amps had virtually identical efficiency on the 20M test.

Carl
KM1H

>
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