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October 26th 07, 12:15 AM
posted to rec.radio.amateur.antenna
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Slow wave antenna design for top band
"art" wrote in message ups.com... On 25 Oct, 14:47, Cecil Moore wrote: Denny wrote: Dunno... Interesting problem... Not really - a helix can slow down a wave by a factor of 50 or more. Approximately a foot and a half of 75m Texas Bugcatcher stock will be self- resonant at 4 MHz. That's 90 degrees of antenna stuffed into about a foot and a half of coil. 90 degrees at 4 MHz is 61.5 feet. The VF of that coil is 1.5/61.5 = 0.024. Actually, pretty simple. -- 73, Cecil http://www.w5dxp.com Yes Cecil I see where you are coming from but and it is a big but the turns must be exposed to radiate and it is that that one must not lose sight upon Art try a ctha that may do what you want. |
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