Hi Carl, I temprorary used 200m of CAT6 cable to connect two reversable Beverages - one direction per one pair few summers ago. Worked well. I used regular binocles from 73 material for transformers both at Beverages (450 >> 100 Ohm) and for baluns at radio. So had 4 directions with one CAT cable.
ZL3IX provided measurements for "crosstalk" between pairs - ir was in 50dB range for CAT5E he had for same lenght. 73 Arunas LY2ij > Would shielded CAT5 be useable as a Beverage feed? It would be easy enough > to match with a binocular core at both ends and I just happen to have > about > 300' doing nothing. > > Carl > KM1H > > > > ----- Original Message ----- > From: "Jim Brown" <[email protected]> > To: <[email protected]> > Sent: Monday, September 09, 2013 2:12 AM > Subject: Re: Topband: CAT5 for Flag Antenna Feedline ? > > >> On 9/8/2013 10:30 PM, Bob K6UJ wrote: >>> I got the impression from the post >>> that CAT5 is immune to common mode noise. >> >> I've not heard that, nor can I think of a theoretical basis for saying >> so. >> CAT5 is very good twisted pair, with a high twist ratio, Zo = 100 ohms, >> and its loss is low enough to make it work fine on 160M. The primary >> advantage of twisted pair is that it rejects DIFFERENTIAL mode noise. >> Rejection is greatest when both ends of the line are balanced. >> >> One possible source of your confusion may be reading, but not fully >> understanding, my work, and Neil Muncy's work, on SCIN, whereby certain >> deficiencies in the construction of a cable shield convert common mode >> current to a differential voltage on the signal pair. I have on several >> occasions observed that high quality unshielded twisted pair, like >> CAT5/6/7, would have much better noise rejection than that sort of >> cable. >> Read about it in several tech papers and tutorials on my website. No >> need >> to burden the list with it. >> >> 73, Jim K9YC >> >> _________________ >> Topband Reflector >> >> >> ----- >> No virus found in this message. >> Checked by AVG - www.avg.com >> Version: 10.0.1432 / Virus Database: 3222/6150 - Release Date: 09/09/13 >> > > _________________ > Topband Reflector > _________________ Topband Reflector
