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#11
July 6th 08, 01:44 PM
posted to rec.radio.amateur.antenna
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Why does the Lazy H antenna suck in the real world on 11 meters?
On Jul 6, 12:04 am, Cecil Moore wrote:
Michael wrote: According to the ARRL handbook the highest gain is achieve with a 5/8ths wave spacing between the upper and lower elements. The handbook gives the following figures for estimated gain. 3/8 wave spacing = 4.4 dbd 1/2 wave spacing = 5.9 dbd 5/8 wave spacing = 6.7 dbd 3/4 wave spacing = 6.6 dbd It seems to works on 14 MHz (stacked dipoles at 14 MHz), but on 10 meters the single 10 meter dipole blows it away. Quoting the ARRL Antenna Book: "It should be designed for the higher of the two frequencies using 3/4 lamda spacing between parallel elements. It will then operate on the lower frequency ... with 3/8 lamda spacing. If you have 5/8 lamda spacing on 20m, you will have 5/4 lamda spacing on 10m with poor performance. -- 73, Cecil http://www.w5dxp.com It is designed for the higher band. |
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