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no computer analysis. It is certainly much better than my A3 was on the same tower at the same height. John, VE1JS At 15:32 06/03/00 -0500, you wrote: >Stephen, > >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 > > > -------------------------------------------- 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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