Topband: 75 ohm RG6 to 50 Ohm radio

Lee STRAHAN k7tjr at
Tue Sep 27 23:46:47 EDT 2016

 Yes Ed, You have the right numbers. It won't matter which windings are first or last. You can even wind 4 then wind 1 more and use it as an autotransformer where the 1 turn is added to the 4 for 5. Any of these will work fine at these TOP Band and higher frequencies. This ratio is not perfect but will work just fine. It would be 50 to 78 ohms which in our world is close enough.
 Let us know how your new 8 circle works. Maybe even compare it to your Hi-Z 4-square.
Lee   K7TJR

-----Original Message-----
From: Topband [mailto:topband-bounces at] On Behalf Of Ed Stallman
Sent: Tuesday, September 27, 2016 8:35 PM
To: topband at
Subject: Topband: 75 ohm RG6 to 50 Ohm radio

My receive antenna is 75 Ohm RG6 connected to my radio and I want to wind a 2873000202 binocular core to step 75 to 50 Ohm's . I seen this info on W8JI web page but can't seem to find it again.

I do remember it's 4 turns 50 Ohm and 5 turns 75 Ohm and all wires come out the same side of the core . Am I correct so far?

Does it make a difference which winding I wind first ?

Thanks in advance , Ed N5DG

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