Al: Al et al;
I do agree. And in fact my 250 ft center fed antenna with 75 ft of window feedline terminates at the operating position into a Balun Designs 1171T. Then a coax jumper of about 2 ft long, which is actually a model 8232 from The Wireman, Common Mode Choke between the balun and the output of the KAT500 tuner.
I was asked recently on another discussion group why I used both a balun and a common mode choke. The balun itself does not provide adequate common mode choking ability for all bands 160M - 10M. Since I must use a coax jumper between the balun and tuner, why not just make it a common mode choke. All seems reasonable and simple...... like me. Thus one cable and 2 connectors and a quantity of ferrite beads does double duty.
And yes for my coax center fed antennas I use a 1:1 current balun, which is no more than a length of coax with a number of ferrite beads at the feed point in a PVC enclosure that serves as the center insulator. I forget the brands and models. They have been up on the tower for several years.
73 Bob, K4TAX On 1/13/2019 5:42 PM, Al Lorona wrote:
By the way, whenever Jim says, "...a very good common mode choke at the feedpoint of an antenna...," he means an antenna fed with coax. For the rest of us, of course, that choke would (should) go at the output of the antenna tuner, whether in the shack or close by. Al W6LX
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