[Amps] PI-L Thoughts!

[Ulf (SM0NOR)]

Ok. Thanks.

I'm looking at my 25-300 C1 and I got the idea to "chop" it up in two sections. It looks like a fairly simple procedure. Question is if the smaller section will render in a value low enough? The procedure is non reverseable :)

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On 12 dec 2010, at 09:31, Ken Brown <ken.d.brown at hawaiiantel.net> wrote:

> 
>> 1, add a smaller C1 to the existing and switch in/switch out
>>  
> You probably do not need to switch in/out the smaller variable capacitor, because it will be an insignificant amount of additional parallel capacitance on the lower frequency bands.  You only need to switch the larger variable capacitor out on the higher frequency bands.
> 
> Another way of putting it:
> 
> C1A = small variable
> C1B = large variable
> 
> Band ....C1 total=
> 160...C1A+C1B
> 80...C1A+C1B
> 40...C1A+C1B
> 30...C1A+C1B
> 20...C1A+C1B
> 17...C1A+C1B
> 15...uncertain, maybe just C1A
> 12...C1A
> 10...C1A
> 
> No need to switch C1A out for any band.
> 
> DE N6KB
> 
> 
>