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part of the underwelming performance by any chance due to a low height i.e. 70-80 ft rather than 130 ft? k7puc ----- Original Message ----- From: "Wil DJ7AA" <dj7aa-wil@t-online.de> To: <K7LXC@aol.com>; "Force12T-reflector" <Force12Talk@qth.com> Sent: Friday, September 08, 2000 8:45 AM Subject: [Force 12 Talk] Re: K7LXCs comments about 80m Yagi--4-Square > K7LXC@aol.com schrieb: > > > > In a message dated 09/07/2000 9:59:34 PM Pacific Daylight Time, list@qth.com > > writes: > > > > > From: "ray reed" <ray1965@hotmail.com> > > > To: Force12Talk@qth.com > > > Subject: [Force 12 Talk] Force 12 MAGNUM 2/2 > > > Date: Thu, 07 Sep 2000 22:16:57 CDT > > > Message-ID: <F178oMhrQkhJnctTwQl00004a27@hotmail.com> > > > > > > I would like to hear from anyone who has the Magnum 2/2 or Force 12 80 > > meter > > > beam. I would be interested in pro and con in performance and mechanical > > > construction. > > > > As a general rule, the bigger the antenna the more fragile it is and the > > more maintenance it takes. Mechanically the F12 linear loaded beams are > > pretty good. Electrically I've heard some grumblings but don't know of any > > first-hand real electrical problems that were traced to antenna electrical > > parts/design. > > > > As far as performance, they're okay. I have never had any of my customers > > (I've probably installed 12-15 F12 linear loaded antennas) told me they were > > overwhelmed with how well they played. Since you only have two choices - F12 > > and M2 and they're both linear loaded - you get what you get. But it IS a lot > > cheaper and easier than a 4-square array! > > > > Cheers, Steve K7LXC > > Tower Tech > > > I dont agree, that a big 80m yagi is a cheaper way than a 4-square. > A real working 4-square consists of slooping wires you can have for at > last > less than 500 US $..what are the price for a 2el magnum 80m ?? > > I using wire constructed 4-square since 3 years, and believe me this > antenna works. get more that 315 countrys on 80m. You only need one > suporting tower, but this you also need for the yagi..all other stuff > (wires, cables, switching box etc..) you get much cheaper than the yagi. > You do not neet a rotator..so why you mean, a yagi is cheaper than a > 4-square??? > > problems with a Force 12 Magnum after my experiences > > I have now after 4 years of using a Magnum 620/340 (D-Modell for high > winds) > lots of trouble. > If you have your Magnum really have to run, you must install your beam > in > minimum height of 1/4 lambda..this is 20m ore more. you need a tower in > a > range of several thousand US $. The other problem, mechanical > construction > from the Force 12 Yagis ist not that good. > I have now after 4 years of using a Magnum 620/340 (D-Modell for high > winds) > lots of trouble. > -One linear loading wire from the 40m reflector has brooken. > -the fiberglass arm for holding and insolated the linear laoding wires > burned over on the driven element (had to put little ceramik insulators > in it to fixe this problem) > - Mean problem, the I lost all the rivets on the boom-boom connetion > (factory assembled side) there was no bolt in this connection!!! > > The antenna really need some lateral bracing, to reduce the > bending moment to the boom. > > So the electrical performance of the antennas are very good, no > question..but if you live in a area that have more winds lik this > little southern California brise, you have to assamble something > additional to protect the antenna. > > The front to back of this linear loading system also is not that > good. Compare to my old 2 ele 40m Highgain I only have 5-10 dB > on the Force 12 (3ele) and 20 dB on the 2 ele HighGain. > I know lots of people on the west coast replaced the linear > loadings with high Q coils. > > This are comments from a Force 12 user have 4 years of experiences > and I am not a dealer like K7LXC, who may be like to sale > a product.. > > 73 Wil DJ7AA > > > -------------------------------------------- > 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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