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## [CQ-Contest] Feeding Antenna Arrays (Victor Dively)

 Subject: [CQ-Contest] Feeding Antenna Arrays (Victor Dively) kr6x@kr6x.com (Leigh S. Jones) Wed Sep 11 22:18:14 2002
 The tricks are: 1) Make the two antennas quite identical. 2) Choose the heights at which they are mounted carefully so that the match is identical on each. Also, choose the heights so that the lower is very close to half the height of the upper. For example, when two ten meter yagis are stacked, 35 and 70 feet would meet both these criteria. W6EEN uses 3 10 meter yagis at 105, 70, and 35 feet, and can select almost any combination of the 3. A good simulation program like NEC-2 is helpful in determining the best heights. 3) Use equal lengths of identical coaxial cable between the antennas and the match box. Connect the two in parallel and match for 26 ohms (2:1), or feed one at a time with no match. ----- Original Message ----- From: "Victor Dively" To: Sent: Tuesday, September 10, 2002 10:14 PM Subject: [CQ-Contest] Feeding Antenna Arrays > I have a question about arrays - I read about phasing details, but I > haven't seen anything about current distribution. Since an array depends > on equal current getting to all the antennas, how (if at all) do you > ensure that all antennas are receiving equal amounts of current? After > all, if one antenna is 1.5:1 on a frequency, and the other antennas are > at 1.2:1 on the same frequency, it would appear that the current will > flow the most towards the antennas with the best match, and upset the > expected radiation patterns for the array. > > I thought contesters may have the most experience with HF arrays... Any > information or pointers to sources of information on the topic of > correctly feeding arrays would be appreciated.... I'm hoping to have > something better set up for CQWW this fall.... > > 73, > Vic KG4HTT > > ________________________________________________________________ > GET INTERNET ACCESS FROM JUNO! > Juno offers FREE or PREMIUM Internet access for less! > Join Juno today! For your FREE software, visit: > http://dl.www.juno.com/get/web/. > _______________________________________________ > CQ-Contest mailing list > CQ-Contest@contesting.com > http://lists.contesting.com/mailman/listinfo/cq-contest
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