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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? Thanks & good DX, 73, Tony Tony Armendariz, AD6ID ad6id@arrl.net FISTS 3535 WPSS ARRL >Date: Mon, 22 Nov 1999 10:57:54 -0700 >To: Stuart Browne <satcom@lava.net> >From: Tony <ad6id@arrl.net> >Subject: Re:F12 C4XL Assembly and Tuning Love Story >In-Reply-To: <38397BFC.20624700@agilent.com> > >Hi Stu, > I just put together a C4SXL with a nearly identical experience to yours. I'm still waiting for an answer from N6BT on why the 40M adjustment was so far off. Instead of 14" I wound up at 24" on the driver's linear loading to get a 1.3 SWR at 7.080 (measured at 30 ft thru 70 feet of coax). Before making this adjustment, we verified the dimensions of all 40M elements (tilt-over tower); they were right on. > Where did your adjustment wind up? Got any theories? > > I also found the factory tuning on 10 M to be at 29.0 MHz. An odd place to need a beam, don'tcha think. Anyway, 2 holes and 4 rivits later I'm centered at 28.4 MHz. > > I broke one of the Aluma-Weld wires, too. > > I was able to use mine in CQWWphone and run some DX in between. In the contest I got 20 countries in < 1 hour. Hunting DX with the webcluster, I can have QSOs with weak DX that I cannot even hear on a ladder fed dipole. > > I love it. > >cheers & 73, Tony > >Tony Armendariz, AD6ID >ad6id@arrl.net >FISTS 3535 WPSS ARRL > >>-------- Original Message -------- >>Subject: [TowerTalk] F12 C4XL Assembly and Tuning Love Story >>Date: Sun, 21 Nov 1999 20:21:30 -1000 >>From: Stuart Browne <satcom@lava.net> >>To: towertalk <towertalk@contesting.com> > >> >>I assembled all of the elements and the boom in my driveway and then >>carried everything up to my roof. The roof is only slightly sloped so >>its perfect for assembling beams. I used three plastic/foldedable saw >>horses which I layed out and assembled the boom on. Then I added the C3 >>and C4 elements, the C4 40 meter "spreaders", and after a little head >>scratching (the photos in the assembly manual were hard to read) the >>Aluma-weld wire and the linear loading elements for the 40 m elements. >>On the 40 m reflector I snapped two of the Aluma-Weld 40 m elements >>connecting them to the spreader. I called F12, and they sent me a free >>set of replacements via 2nd day air so I had a few extra days of >>anticipation. >> >>Using the MFJ analyzer I checked the VSWR on the C3 portion of the beam >>and all of the VSWR was 1:1 or 1:2...right on the frequencies where I >>want to operate. The C4 portion of the beam took a little time to "tune >>and prune" . Tuning which consists of setting the linear loading >>elements per the manual and the adjusting them for the frequency you >>want. The frequency as per the book setting where I found unity was 6.3 >>mHz., a little out of band even for KH6 ! It took less than an hour to >>adjust the linear loading elements and the hair pin matching coil until >>I found a 1:1 reading at 7.1 mHz. > >> >>73's and Aloha, >>Stu >>WH6H >> -------------------------------------------- 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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