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As noted on page 8 of our catalog when discussing ANTENNA SPECIFICATIONS, "(The net gain numbers will be fairly constant for antennas installed at 35' and higher)." However, as the antenna will be reacting to signals arriving at higher angles when installed at lower heights, the f/b may be lessened somewhat. Of course the height above ground that the array cares about is the effective height above ground which can be quite different than physical ground. The effective height above ground depends on many factors, including the presence of nearby structures and the composition of the soil. Unfortunately, there is not an easy way to determine what height the antenna thinks it is at without detailed soil and near field analysis. Natan W6XR/2 FORCE 12 East Ithaca, NY ----- Original Message ----- From: Stephen Carroll <K2SC@QSL.NET> To: <Force12Talk@qth.com> Sent: Monday, March 06, 2000 2:57 PM Subject: [Force 12 Talk] Re: C-19-XR > Correct me if I'm wrong, but doesn't the F12 specs mention that all their > testing is done at 72 feet? That being said, I'd like to know how any of the > F12 antennas perform at tower heights LESS than the prescribed > 72 feet. How does the gain and F/B differ from the advertised chart if the > antenna was mounted on a 45 foot tower (as described below) ??? > > 73, Steve - K2SC > > ----- Original Message ----- > From: Alan Kaul <alan.kaul@worldnet.att.net> > To: <Force12Talk@qth.com> > Sent: Monday, March 06, 2000 3:01 AM > Subject: [Force 12 Talk] C-19-XR > > > > I don't have the space for a 31-foot boom (nor the tower!) but I like what > > I've read about the C19xr. Anyone out there have one installed? And if > you > > do, what height, etc., and with what results? My tower is only 45 feet > > tall, (my city's allowable maximum--unless the CA legislature enacts > SB1714 > > to restrict cities from limiting towers below 75 feet). > > > > I am most interested in antenna F/B. From the paperwork, it looks like it > > outperforms C3 significantly. Anyone try it in the recent ARRL CW or SSB > > contests? > > > > Pla and tnx in advance, 73 de alan > > > > Alan Kaul, W6RCL, LaCanada, CA > > w6rcl@amsat.org , http://home.att.net/~alan.kaul/index.html > > > > > > -------------------------------------------- > > 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 > > > > > > > -------------------------------------------- > 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 > > -------------------------------------------- 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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