Re: VHF Band 1 Amp Design

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#2100

From: Rich Grise
Date: Thu, 11 Nov 2004 07:33

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On Thu, 11 Nov 2004 12:34:37 +1100, rigg wrote:

> I have a tv modulator, ch0 46MHz, and I want to boost its output with a
> simple one transistor amp connected to a short antenna so it will transmit
> up to about 20 metres. I was thinking of using a 2N3866 in a class C
> configuration with a 12v supply. Can someome give me advice on how to select
> values or provide a simple circuit so I can do this? I am not sure how to
> pick values when using a short antenna of 30 cm. I assume matching
> impedances must come into this somehow... I have seen lots of circuits on
> the web but they are for much lower frequencies. Thanks Rigg

With proper antennas on each end, what you already have should be able
to cover 20 meters distance, with no problem. 

Well, except that a 1/2 wave dipole is a little over 3 meters long.

Good Luck!
Rich

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