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The choking performance of the B1 is actually a little better on 10 M than it is on 15 M, (see spec sheet at: cal-av.com/baluns-ds.html) so something else is going on, perhaps pickup by the feed line beyond the balun. 73, Ken Frank C. Travanty wrote: > I have been reading the comments on baluns with great interest. > > I am using a C-31XR & WARC 2/2, both fed with F12 B1 baluns. The system > uses a single 50 ohm feed (~120 ft) with a DowKey six position remote > switch (I KW AM rated to 500MHz) at the top of the tower to select the > antennas. The switch was tested for SWR & loss into a 50 ohm resistive > load, with a Bird, prior to installation and SWR & losses were > negligible. I have a straight line run of about 40 feet of coax in the > basement before the feed exits the house. If I put a ~200W CW carrier > on, and walk along the coax with a wave meter ~ an inch from the coax on > 10M or one foot from the coax on 15M, it will "peg" the meter every > several paces on 10M & essentially be constant on 15M indicating to me > that, I have not choked off the RF as desired. I was beginning to > question the remote switch, but have no rational to do so. Anybody out > there had a similar experience or ideas? Is there a quantitative test out > there to determine the effectiveness of the balun by examining the > feedline? What is considered "good enough"? > The field strength meter is an old Monarch FSI-2 which uses a 100 uA > movement and a simple LC ckt followed by a diode rect. & 10 inch antenna. > > Frank > W9JCC > > On Sun, 14 Jan 2001 13:39:13 -0800 "John Petrich" > <petrich@u.washington.edu> writes: > > Pete, > > > > Absolutely, I agree 100%. Your logic is exactly the reason why > > I > > believe that ferrite based low Q broad band baluns are THE way to go > > in the > > majority of high performance expectation antenna environments. I > > feel > > sorry for some of my friends who continue to live with significant > > common > > mode current related problems with their antennas because their > > belief > > systems are subjective and not data driven. Enough soapbox. > > > > Wish I lived at your latitude and could hear all the DX that I > > hear you > > guys working these days. Have a nice weekend. > > > > Regards, > > > > John Petrich, W7HQJ > > > > > > > > -------------------------------------------- > > Force12Talk mailing list provided as a service by Force 12 Antennas, > > Inc. > > Force 12 Web site: http://www.qth.com/force12 > > > > Submissions: send to Force12Talk@qth.com > > To unsubscribe: send a blank e-mail to Force12Talk-leave@qth.com > > Force12Talk Message Archive: http://www.qth.com/force12/list/force12talk > > For problems with the list, contact n4zr@qth.com > > > > > > ________________________________________________________________ > GET INTERNET ACCESS FROM JUNO! > Juno offers FREE or PREMIUM Internet access for less! > Join Juno today! For your FREE software, visit: > http://dl.www.juno.com/get/tagj. > > -------------------------------------------- > Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. > Force 12 Web site: http://www.qth.com/force12 > > Submissions: send to Force12Talk@qth.com > To unsubscribe: send a blank e-mail to Force12Talk-leave@qth.com > Force12Talk Message Archive: http://www.qth.com/force12/list/force12talk > For problems with the list, contact n4zr@qth.com -------------------------------------------- Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. Force 12 Web site: http://www.qth.com/force12 Submissions: send to Force12Talk@qth.com To unsubscribe: send a blank e-mail to Force12Talk-leave@qth.com Force12Talk Message Archive: http://www.qth.com/force12/list/force12talk For problems with the list, contact n4zr@qth.com |