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I have a C4XL and tuning was not problem in my installation. I have the C4XL mounted at 60' with the guy wires at the 27' and 50'. I used the measurements from the manual for the cw setting and I was right where I wanted to be. Maybe I was lucky. The good news is that you can get to the 40m driven element while the beam is mounted on the mast. You remove the pin holding the spreader so you can move it towards you. Use a nut driver on the cable clamps to loosen the shortening bar (don't loosen it too much) and move the shorting bar accordingly. Thats how I would change the reasonant point for ssb and cw contests. I now have the relay box installed so I can change between cw and ssb from the shack. Now don't get me wrong on this. Its not a lot of fun being on the tower stretching out with both hands at 60' in the air to do this. But if your comfortable on the tower its not a big deal. Bill Roberts - K8DXX wrote: > I am about to put up a C4XL. > > I just got off the air with a couple guys who reported some difficulty > getting Force 12 linear loaded 40 meter elements to tune easily. One OM had > the EF140S added to a C3SS. The other had the EF240S as a separate antenna > (although it was mounted above, not below a C3...problem?). Both reported > tuning jumper settings being much further from the spreader than > recommended in the manual. One guy reported having to add another turn to > the hairpin match. The GOOD NEWS is that both reported performance being > worth the effort! > > My question to EF140S derived antenna owners is what jumper setting did you > find successful and at what tower height? How about the hairpin match; any > modifications aside from squeezing or stretching? Also, I will probably > have an antenna analyzer available to me. If you have used one to tune up > an EF140S, did you use it at the end of a long coax run or using a short > piece of cable. > > As a side note, I'll have my C4XL about 15 feet above our second story roof, > fed through CAL/AV baluns and a little over 115 feet of RG213. Any > suggestions would be welcomed. > > 73 > > Bill / K8DXX > > -------------------------------------------- > 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 n4zr@qth.com -- 73, Richard Thorne Amarillo, TX Amateur Radio Station - N5ZC (Ex. KA2DSY, N2BHP, WB5M) Remote Control Planes - AMA # 657062 Web Page: http://www.tcac.net/~rthorne/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 n4zr@qth.com |
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