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Warning: Theoretical discussion without experimental validation follows. YMMV. 1. See http://www.ifwtech.demon.co.uk/g3sek/stacking/stack1.htm for an interesting discussion of stacking Yagi's; mostly VHF/UHF oriented, but applicable. 2. A few months ago I spent some serious time with YT (Dean Straw's Yagi Terrain, included with ARRL Antenna Book) looking at antenna heights illuminating sloping forground, which I assume is your situation out where you live. Higher isn't always better (according to the computer model). Or at least enough better to justify lots of work & $$. And it is certainly true that there are sweet spots and poor spots when you have sloping foreground. If your terrain slopes downward nicely to the NE, you might find that 45 or so feet is a great spot for a fixed 2nd radio tribander. You might do some quick analysis with YT... the price is certainly right. 73, Dave N6NZ (Looking forward to doing some experimental validation this summer :-) -----Original Message----- From: Andrew Faber [mailto:andrew.faber@gte.net] Sent: Monday, January 22, 2001 9:30 PM To: Force12Talk@qth.com Subject: [Force 12 Talk] antenna interaction question Hi Force 12er's, I have a question about antenna location and interaction. I currently have the following setup (all Force 12): A 65 foot tower on a hillside with the base actually about 25 feet below my house level. On top at 65' is a 3 el 20/2 el 40, with an 80m rotatable dipole five feet above and a small 3el 10/3 el 15 five feet above that. I would like to mount a small tribander like a C3S on the tower fixed NE for use a second radio antenna. Assuming I don't care about operating it as a stack with the tower-top antennas, I'm wondering how close to the 65' level I can put the hypothetical C3S without interacting with the other antennas. I assume that as a second radio antenna, higher would be better. I'd appreciate any advice from the antenna mavens on this reflector. Thanks and 73, Andy, AE6Y -------------------------------------------- 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 |
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