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Your symptoms indicate the studs were assembled incorrectly. The manual discusses "same side" versus "opposite sides." It is possible to assemble the tips to the trunk 180 degrees off it the factory drilling was symmetrical. If these studs are rotated, the resonance changes as the length and loading of the loading section changes. Please refer to the overhead drawing and note that on the 40 meter elements the trunk of the antenna should have the studs mounted on opposite sides. The tips likewise should have studs mounted on opposite sides. 73 Natan W6XR Force12 East Ithaca, NY FN12sk ----- Original Message ----- From: "Tony" <ad6id@arrl.net> To: <Force12Talk@qth.com> Sent: Saturday, April 15, 2000 12:08 PM Subject: Re:[Force 12 Talk]F12 C4SXL .. Tuning .. > At 11:03 AM 4/15/00 +0000, Pete wrote: > >At 08:05 PM 4/14/00 -0700, Tony wrote: > >>Hi all, > >> Now that there is a Force12Talk reflector... > >> > >>Has anyone else had trouble tuning the 40 meter section? Was your > >experience similar? Any speculation as to the cause? > > > >Eventually, no .... but it's not the easiest design in the world to work > >with because both elements are identical and only the shorting bars make > >them different lengths. > > > >...If what you're asking is why aren't the shorting > >bar settings as specified in the manual, then my response is probably > >assembly differences compared with Force 12's standard. Did you look at > >the terch notes on their web site with the extensive photos of the linear > >loading? > > Yes and yes and I measured every element and it's position on the beam looking for assembly errors (likely) and factory errors (less likely). I looked at the tech notes and had an early conversation with Tom - haven't chatted after the final adjustment. > > The final shorting bar spacing on the driven element is 24" (The manual's 14"had me tuned around 6.750 with the ant at 25 feet horisontal). The 24" final tuning wound up at 7.080 at 1.2, under 2.0 VSWR at 7.020 and 7.150 (the advertized 130KHz bandwidth). The rest of 40, even SSB, is within range of my 1000MP autotuner. > > It's working great on all bands (including 12 & 17); I seem to get answered early in a pileup even though I'm running 100W - let's hear it for the C4SXL - FB! > > Cheers & 73, Tony > > > > >73, Pete Smith N4ZR > >n4zr@contesting.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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