[Lowfer] re Balun Help

[Jordan]

Hi Alan...

Thanks for the info....This is the type of winding method I'm looking at 
using:

http://www.bobsamerica.com/9-1balun.html

I might have to re-think my plan..!

73...Jordan VE6ZT


----- Original Message ----- 
From: "Alan Melia" <alan.melia at btinternet.com>
To: <lowfer at mailman.qth.net>
Sent: Tuesday, January 04, 2011 10:45 AM
Subject: [Lowfer] re Balun Help


> Hi Jordan.....well anything that you make is going to have to be a
> compromise. The trick with wideband transformers at RF is that the winding
> connecting to the receiver input(one winding) assuming 50R ....needs to 
> have
> a reactance of 150 ohms at the lowest frequency you want (50kHz) So you 
> are
> looking for about 500uH. That would be a lot of turns on a red code so you
> probably need to calulate (or measure) that for a grey core. You then 
> twist
> the wires reasonably tightly and hope for the best at the top end. The 
> code
> doesnt do anything at the top end anyway the coupling it purely in the
> closely twisted wire "transmission line" You will obviously need a fairly
> big aperture to get enough turns through the ring.
>
> Alan G3NYK
>
>
>
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