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September 29th 04, 06:11 PM
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"Richard Clark" wrote in message ... On Wed, 29 Sep 2004 04:15:57 GMT, Richard Clark wrote: It seems in my effort to find the page(s) associated with HP and your equipment, I forgot to expand on the issues promised. The antenna is generally known as a "shielded, balanced dipole." This is often applied to receive applications. For the dimensions you suggest (halfwave overall length), the Z multiplication would indeed present a 6:1 mismatch - on average. To answer your question about what Z would be present at the "feed point": it would fall along the circumference of a constant SWR 6:1 circle (speaking of a Smith Chart solution) depending upon the length of the electrical distance to the true feed point. This will be greater than the halfwave of the antenna structure given that its electrical length is not confounded by insulation properties. I have seen this design used for repeaters, but in a 4 bay configuration. Undoubtedly the harness feeding it was composed of halfwave sections placed in parallel to draw down the mismatch (at least it acted like this, the wiring was hidden within the greater supporting structure). 73's Richard Clark, KB7QHC Thanks, Richard. John |
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