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[AMPS] Final (??) Comments on B&W850A

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Subject: [AMPS] Final (??) Comments on B&W850A
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Date: Fri, 12 Feb 1999 19:15:14 -0500

On Fri, 12 Feb 99 14:10:21 -0600 Jon Ogden <> writes:
>>As mentioned here many times and in magazines is to take the ideal L 
>>want for 10M and run the C off the center tap. This will have the 
>>of requiring a 4X stepup in the C requirement. It and the L you 
>>also affects all the other bands in decreasing amounts.
>So what I am hearing you say is if you want 2 uH of L on 10M, then you 
>put a 1 uH coil between Ctune and the blocking caps and the other 1 uH 
>coil from Ctune to Cload.


>Sounds like the same thing I was thinking except for the fact that I 
>didn't realize that both inductors should be of equal value.

The idea was to increase the minimum required C. You can move the tap
around for other stepups but the balanced T arrangement is the one most
often mentioned.

Adding another completely seperate L ahead of the 10M coil works on paper
but I have not tried it ; but would seem to add a reverse requirement on
the lower band taps.
In either case and in reality only 12, 15, 17 and 20M in descending order
would see a noticable effect.
Nothing is simple!

73  Carl  KM1H

>Jon Ogden
>"A life lived in fear is a life half lived."
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