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.... >Anyone using 72 ohm CATV hardline successfully? Yes, indeed. In my installation (C-3 + EF-240S), I use multiple half-waves of 72-ohm CATV. On the shack end is 50 feet of RG-213, while on the antenna end is my remote switch, with RG-213 up the tower to the antennas. I realize that the 1/2 wavelength solution is imperfect as a repeater of the input impedance, particularly when fairly large frequency excursions are involved, as on 10 meters. I cut mine for a multiple of 160 meters (actually 1750 khZ), then measured it at 28 mhz using an Autek RF-1. I used an RG-11 pigtail at the tower end to make the length as precise as possible. Measured line loss at 10m of < 1 db., plus excellent swr bandwidth on all bands, are the proof of the pudding for me. Bandwidths are per spec. Just for fun, I am building up a pair of 75:50 ohm UNUNS to see whether the performance improves in any measurable way with a fully-matched feedline. So far, for me, simpler is better. 73, Pete Smith N4ZR n4zr@contesting.com Don't forget to update your entry on the World Contest Station Database, now at http://www.contesting.com/stationdatabase.htm -------------------------------------------- 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 force12@qth.com |
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