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From: James Rodenkirch [mailto:[email protected]] Sent: Monday, August 12, 2013 6:04 PM To: Charlie Cunningham; [email protected]; [email protected] Subject: RE: Topband: CAT5 twisted pair OH...okee dokee on not needing the 2:1 xfmr > From: [email protected] > To: [email protected]; [email protected] > Date: Mon, 12 Aug 2013 17:12:59 -0400 > Subject: Re: Topband: CAT5 twisted pair > > 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:[email protected]] On Behalf Of Jim Brown > Sent: Monday, August 12, 2013 5:03 PM > To: [email protected] > 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 > _________________ > Topband Reflector > > _________________ > Topband Reflector _________________ Topband Reflector
