Topband: CAT5 twisted pair

[Charlie Cunningham]

Jim,

I completely agree with Jim Brown!  I noted those 2:1 transformers the other
day and  meant to send you a note to say that I wouldn't bother!  That
little bit of mismatch loss won't make any difference!

73,
Charlie, K4OTV

-----Original Message-----
From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of Jim Brown
Sent: Monday, August 12, 2013 5:03 PM
To: topband at contesting.com
Subject: Re: Topband: CAT5 twisted pair

On 8/12/2013 1:50 PM, James Rodenkirch wrote:
> as well as a 2:1 transformer just prior to the input to the shack.

While there's nothing wrong with attempting to match the termination Z, 
don't assume that it will do much. The input Z of the RX may not be 50 
ohms (although the doc may say it is), a small mismatch won't contribute 
enough loss to matter, and it does not affect noise rejection. What 
matters is balance and twisting.

73, Jim K9YC
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