[Amps] Asynchronous coax matching transformer

[Carl]

Thanks Ian

Carl
KM1H




----- Original Message ----- 
From: "Ian White GM3SEK" <gm3sek at ifwtech.co.uk>
To: <amps at contesting.com>
Sent: Saturday, August 01, 2009 2:38 AM
Subject: Re: [Amps] Asynchronous coax matching transformer


> Carl wrote:
>>Does anyone remember the formula for matching 50 to 75 Ohms with 2 very
>>short lengths of coax?
>>If I remember it used a 75 Ohm section at the output of the amp, and a 50
>>Ohm section to the CATV hardline. Frequency dependent of course.
>>
>>Its been about 25 years since I built one.
>>
> 
> http://www.tuc.nrao.edu/~demerson/twelfth/twelfth.htm
> 
> By paralleling two lengths of 50 or 75 ohm line, it can also match to 25 
> or 37.5 ohms; or to even lower impedances by paralleling three lengths 
> of the same line.
> 
> 
> -- 
> 
> 73 from Ian GM3SEK
> http://www.ifwtech.co.uk/g3sek
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