| Index | Thread | Archive | May-2000 | Archive | Send |
 |
  |
  |
   |
|
  |
|
writes: > When the wind is perfectly calm, I measure 1.4:1 on the Nye Viking meter in > the shack on 21.300. At wind speeds under 20 MPH (my best guess), the SWR > varies from 1.2:1 to 2.2:1 with a period of 2 to 3 seconds which > corresponds directly with the observed element motion and spacing variation > of the driven elements (15/20 meter elements). On really windy days, it's > worse in direct proportion to the wind speed. Yes, wind induced swr fluctuations are common with any parasitic sleeve feed system. Fastening the elements down is highly recommended. While different plastics have different UV resistances, I would get some plastic strips and attach them to the offending elements. Problem solved. This isn't worth agonizing over - just do it. If they only last a couple of years, do your research and get a better plastic next time (you can replace them on the tower). Cheers, Steve K7LXC Tower Tech -------------------------------------------- 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 force12@qth.com |
This Thread
|
This Author (May-2000)
|