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Re: [TowerTalk] Problems on a 2el vertical Array

 To: Jim Lux Re: [TowerTalk] Problems on a 2el vertical Array Tobias Wellnitz Sat, 10 Jan 2004 05:41:26 +0100
 Hi Jim & all, ```thanks alot for your help. I'm just trying to write a little bit more detailed document about my experiments with the verticals.``` In order to conentrate on the main problem, I didn't tell that my array was a little bit bigger. I set up 3 verticals in a isosceles triangle . At any time I'm using two 2 verticals. This gives me 6 directions. I can supply more informations (pattern, NEC files, messurements, pictures...etc) but let me just quote your comments: Close in contacts (or two bounce contacts) will have a high elevation angle, so the relative phasing of the antennas is not as optimized as for a low angle propagation. Essentially, the antennas are closer together by cos(elevation angle). ```Right. Anyway, I should have in *all* situations more than 6dB f/b ratio. (according to the antenna pattern)``` Right now I have two possible answers / questions: 1. Is this the typical behavior of a 2el vertical Array ? ```If your measured data matches theoretical expectations within 3 dB, on an HF antenna over real ground, I'd be pretty happy. Null depth (driving F/B) is the first thing to suffer.``` ```Consider also that the incoming wavefront is NOT a nice flat idealized wavefront, but varies with time and probably has local wiggles.``` ```Have you tried setting things up so you can swap front and back directions to measure f/b directly?``` ```Yes, of course. I made two switching boxes: 1. 2el Array (2 switchable directions + single vertical) 2. 3el Array (6 switchable directions)``` 73 Toby, DH1TW _______________________________________________ See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA. ```_______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk```
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