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To move the resonance of the 40 meter element you adjust the two shorting straps on the CIC loading assemblies. Since the antenna is resonating too low, you need to effectively shorten the element, accomplished by moving the jumpers toward the tips a few inches. Move the jumpers until you have resonance exactly where you want it to be. The coil is an impedance matching device with little or no affect on resonance. Once the resonance is determined by jumper adjustment, compress or spread the coil to get a 1:1 VSWR. Regards, Natan W6XR Force 12 East Ithaca, NY -----Original Message----- From: WW3S [mailto:ww3s@zoominternet.net] Sent: Tuesday, July 22, 2003 9:45 PM To: Force12Talk@qth.com Subject: [Force 12 Talk] c4 tuning/coil Finally got the C4 in the air; I've had the C3E for a while and installed the 40m element a couple months ago and just now got everything in the air (approx 70'). 2:1 points on 40 are from 6.9 to just about 7.0. I think I used the midpoint dimensions; I think I have the coil installed correctly although it is fairly close to the boom. I'm close enough that the autotuner should match but I'd like to be resonant in the band in case I ever go with another rig or SO2R. Should I try the jumpers or the coil first? How sensitive are the jumpers to the tuning? Or should I just leave it be.... 73 Jamie WW3S -------------------------------------------- Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. Force12 Web Site: http://www.force12inc.com To Submit Message to the List: Force12Talk@qth.com To unsubscribe and view the Message Archive: see http://qth.com/force12/list For problems with the list: contact force12@qth.com -------------------------------------------- Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. Force12 Web Site: http://www.force12inc.com To Submit Message to the List: Force12Talk@qth.com To unsubscribe and view the Message Archive: see http://qth.com/force12/list For problems with the list: contact force12@qth.com |
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