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1.antenna fully assembled and only 4 ft off the ground on saw horses. 2. 40 meter linear loading set at 12 inches as per manual on the driven element. 3. Measured SWR 1.2: 1 @ 6940 4. Rohn 68 ft foldover , tilted DOWN, antenna installed ... SWR 1.2: 1 at 6870 ... tilted UP 1.2:1 @ 6910. Moved up in freq. 40 khz when tilted up but still too low. 5. Tilted the tower down again reset the linear loading to 18 inches on driven element ONLY. 6. tilted the tower up SRW 1.2 : 1 @ 7040... 1.5 : 1 @ 7000.... 2.0 : @ 7110. It works SUPER on 40 ...... 73 Whitey K1VV 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? > > 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 -------------------------------------------- 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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