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end Barry Kirkwood PhD ZL1DD Signal Hill Homestay 66 Cory Road Palm Beach Waiheke Island 1240 NEW ZEALAND www.waiheke.co.nz/signal.htm ----- Original Message ----- From: Barry Kirkwood <bjk@ihug.co.nz> To: Curtis, David B <david.b.curtis@intel.com> Cc: <Force12talk@qth.net> Sent: Wednesday, 24 January, 2001 7:39 AM Subject: Re: [Force 12 Talk] antenna interaction question > Can support David's line on sloping sites. > Have just had a major education on the topic from some of the gentlemen on > the towertalk reflector. > It will really pay towork the issue over with YT. > 73 > end > Barry Kirkwood PhD ZL1DD > Signal Hill Homestay > 66 Cory Road > Palm Beach > Waiheke Island 1240 > NEW ZEALAND > www.waiheke.co.nz/signal.htm > ----- Original Message ----- > From: Curtis, David B <david.b.curtis@intel.com> > To: Andrew Faber <andrew.faber@gte.net>; <Force12Talk@qth.com> > Sent: Wednesday, 24 January, 2001 6:05 AM > Subject: RE: [Force 12 Talk] antenna interaction question > > > > Hi Andy, > > 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 > > > > > > > -------------------------------------------- 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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