Re: VHF Band 1 Amp Design

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#2108

From: Tam/WB2TT
Date: Thu, 11 Nov 2004 02:10

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"rigg" <riggdm@hotmail.com> wrote in message 
news:4192c4ff$1@news.alphalink.com.au...
>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
>
I have used the 2N3866 at 50 MHz. So, it should work just fine at 46. You 
can not use a class C amplifier, it has to be linear for video. For the 
extreme low power you need, just build a class A amp.

Tam

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From: "Tam/WB2TT" <t-tammaru@c0mca$t.net>
Newsgroups: sci.electronics.design,aus.electronics
References: <4192c4ff$1@news.alphalink.com.au>
Subject: Re: VHF Band 1 Amp Design
Date: Wed, 10 Nov 2004 21:10:37 -0500
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