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on my tower on May 26th. I have noticed a possible problem on the 15 meter band. I use a Yaesu FT-840, Ameritron AL811 amp at 400 watts and an MFJ-962D 1500 watt antenna tuner. When I tune up my FT-840 transceiver with 25 watts I get my antenna tuner on 1 to 1 SWR. I then turn on my AL811 amp and set the load control to 4 then adjust the plate control to get maximum power output. Usually this is about 9 on the plate knob. I have noticed that when I turn the Plate control from counterclockwise to clockwise I see the SWR shoot way up to 3 to 1 or so. That is...when I turn the knob say from 6 to 10. If I just turn my plate knob just a small amount I don't get a high SWR. It's only when I move the knob quite a bit. This happens only on 15 meters. I wonder if you have any suggestions on what to try to correct his. Is there a problem with the 15 meter elements on the C-3 antenna? Has anyone experienced this? The antenna seems to work all right. Just wanted to try and get to the bottom of this. This didn't happen with my last yagi antenna. Thanks, Bill Barbee W5LV -------------------------------------------- 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 n4zr@qth.com |
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