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#2
November 30th 15, 07:05 PM
posted to uk.radio.amateur,rec.radio.amateur.antenna
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Follow up to Spike ;Bent dipoles?
John S wrote:
On 11/30/2015 11:35 AM, Spike wrote: On 29/11/2015 23:24, wrote: OK, I added radials for a total of 5 in a 45 degree spread and optimized for minimum reactance. radiator: 203 inches, radial: 186 inches, R: 52.4 Ohms, X: 0.4 Ohms SWR: 1.1, Maximum gain: -.18 dBi in the direction of the radial and an elevation angle of 30 degrees, Reverse gain: -3.7 dBi Note with one radial the F/B ratio is about 5 dB and with five radials it is about 3dB. About the only thing I can see worth noting about this antenna is that it shows more radials are better, but everyone already knows that. Imagine a case whereby someone digs up the soil around the base of a vertical antenna, a couple of feet deep and as far out as the antenna is tall. Into this they mix 2 percent of high-aspect-ratio thin conducting fibres, say about a foot long, and then replace the soil. 2 percent of conducting fibres in an essentially non-conducting medium is about the minimum proportion necessary to reach the percolation threshold.. What results from your modelling exercise do you get in this case? Are you unable to model this yourself or are you just trolling? Spike's a long time and well known troll, yes. -- STC // M0TEY // twitter.com/ukradioamateur |
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