[Amps] CB Amps or full spectrum???

[jeremy-ca]

----- Original Message ----- 
From: "Dan Evans" <dan.evans at insightbb.com>
To: "Ian White GM3SEK" <gm3sek at ifwtech.co.uk>
Cc: <amps at contesting.com>
Sent: Thursday, October 11, 2007 1:00 PM
Subject: Re: [Amps] CB Amps or full spectrum???


> Thanks Ian,
> I was waiting for someone to actually point out a good circuit, instead 
> of just pointing out what will not work.

Thats par for the course. The circuit I mentioned is in use by commercial manufacturers whose engineers didnt feel the need to consult with Helpful Harry. Pity. 

I'll be sending it to Ian once I get this new !?#^%@ scanner working properly

Carl
KM1H



> 
> I have a couple of the dreaded VHF/UHF brick amps I would like to improve.
> 
> 73
> Dan
> -- 
> K9ZF /R no budget Rover ***QRP-l #1269 
> Check out the Rover Resource Page at: <http://www.qsl.net/n9rla> 
> List Administrator for: InHam+grid-loc+ham-books 
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> 
> 
> 
> Ian White GM3SEK wrote:
>> clip
>> A simple active bias circuit can give better performance than a passive 
>> diode, and also save on bleed current. There is a classic two-transistor 
>> bias circuit (with design notes) at:
>> http://www.ifwtech.co.uk/g3sek/tr-bias/tr-bias1.htm
>> That circuit gives a reasonable compromise between performance and 
>> simplicity, and is a reasonable retrofit to existing bipolar amplifiers.
>>
>> clip
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