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Thought I would follow up with results with C3E stacked above a Ele KLM 40 meter beam as several of you were interested.. If you remember, I first posted wondering if C3E initial SWR measurements on the SAW HORSE were to be worrisome..I had nominal SWR on 10 and 20 but high on 15. (5:1) 50% of the responses said just make sure dimensions are correct and put it up, and 50% said point vertical or get it up in the air. I didn't have the ability to get it up in the air (trees all around tower) so just went up with the rechecked measurements. (which were correct) Here are the results: Plan was to put C3E on top of a KLM 2 ele 40 mtr beam, with spacing to be 10 feet. At 95' on top of the 40 @ 85', again the 10 and 20 were 1.2 to 1.5 as advertised but the 15 meter portion was still high, 3:1 at CW end and lowest was 2.2:1 on 21.300. ALSO the signal reports from DX on the C3E at 95' were 2-3 S units less than a C3E that was at 50' fixed on EU on the same tower, consistantly. Solution: I rotated the 40 meter beam 90 degrees and the SWR on 15 dropped from 3:1 on CW to 1.5 and 2.2:1 to 1.3 on SSB. Also, the gain appeared to come back with equal or better signal reports with DX Vs. the C3E at 50 feet. I have noticed the propagation plays a huge role in the signal reports, but the SWR improved greatly, and a majority of the time the top C3E is stronger..especailly at opening and clsoing of bands, which is the "way it is suppose to be". Moral of the story: Even though 10 feet would seem to be enough spacing (KLM 40 mtr beam and C3E) by rotating the antennas 90 deg. appears to have made all the difference in the world, with both SWR on 15 and gain.. All this time 40 appeared to not be affected with either gain or SWR..this from signal reports and measured SWR. Rotating did not affect 10 or 20. If you have a similar antenna system, you might want to plan on rotating the antennas 90 deg to each other.. 73, Ken W0LSD -------------------------------------------- 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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