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#4
August 5th 07, 08:43 PM
posted to rec.radio.amateur.antenna
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Verticals: Earth-Mount vs Roof-Mount
Richard Fry wrote:
"Chuck" It would be more accurate to bill this as "Mediocre radial system vs 20 m x 30 m solid aluminum ground screen ". I suspect much the same results would obtain for the roof mount, even if the roof were at ground level. _____________ When the comparison is made between the roof-mounted version as shown in my PDF and an earth-mounted vertical using a 2-ohm "broadcast quality" r-f ground system of 120 buried radials each about 1/4-wave long, then the advantage of the roof-mount version drops to about 5 dB. N.B. these radiators are electrically very short. Using taller radiators would reduce the performance difference. RF |
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