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February 3rd 07, 05:09 PM
posted to rec.radio.amateur.antenna
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help- Mobile 10meters on a jeep
"KE5MBX" wrote in message ups.com... On Feb 2, 9:35 pm, "Stefan Wolfe" wrote: "KE5MBX" wrote in message oups.com... I have been advised by some hams that the best way I can hope to do 10- meters on my jeep is to mount my antenna ON THE WINDSHIELD to get a good ground plane. I read somewhere since then that the primary reason for cophasing CB antennas on trucks is NOT to direct the gain front and back, but to even the ground plane as though the antenna were in the center of the truck. Could I achieve the same effect with my Jeep by cophasing antennas on either side of the jeep by the doors? Even better- could I do this diagonally across from one corner of my jeep to the other? I heard the further apart the antennas are, the better, and I'm not really trying to get front/back gain for DXing. What I did was purchase a 1/2 wave 11 meter whip from Radio shack and trimmed it for 10m. Of course, for 1/2 wave you need not have a ground plane, only a good ground point. I mounted it on the back bumper. It worked very well on my Warngler. Wow, that is some excellent information I didn't know.. that a 1/2 wave antenna doesn't need a ground plane. I looked it up and sure enough, you're right! However, I'm sad to say that I really doubt Radio Shack sells a 1/2 wavelength antenna for either 10 or 11 meters. The classic 102" whip, as I understand, is a 1/4 wavelength. For a second I even considered putting a 2.5-meter (16.4 ft) whip on my jeep, but I finally decided that really isn't practical. So, any opinions on the cophasing of two 1/4 waves? IF they dont they used to. |
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