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Post by Deleted on Mar 6, 2018 19:40:40 GMT
High Speed Antenna Rails
Railroad trains rolling on the track cannot turn a sharp right angle no matter how they try.
To make a left or right turn a train needs to follow a curve.
The tighter the turn the slower the train must travel to avoid leaving the tracks.
Now consider ground radials.
Conventional ground radials are laid in straight lines, but if sufficient real estate is not available can radials be twirled by curving them to get the desired length into a limited space?
Of course each radial would have its equal but opposite counterpart of equal length curving in exactly the opposite direction. There would not be one twirled radial opposite a straight radial, even if more land was available on one side.
But would the effectiveness of ground radials be diminished by curving? Does the RF flow slow down when it hits a curve?
Now what about an extreme situation where radials make a sharp right angle?
What does electricity do when it encounters a right-angle bend in a wire?
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Post by Admin on Mar 6, 2018 23:23:10 GMT
Amateur radio operators have been successfully using non straight radials for a long time. They can certainly bend around obstacles & still work as an RF ground.
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Post by Deleted on Mar 6, 2018 23:26:10 GMT
Which brings up the question, does a screen counterpoise create the same cancelling effect as individual equal and opposite radials?
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Post by Admin on Mar 7, 2018 0:24:49 GMT
Good question. Generally, non elevated radials shouldn't radiate.
But it has to be recognized that the characteristics of a "ground" as defined in the Part 15 (and Industry Canada) rules is ill defined. Radials aren't specifically excluded, nor included. One can argue that radials just help make a more effective ground, even if they do slightly radiate due to lack of symmetry.
As always, it would be an FCC inspector who makes the final call as to the suitability of a Part 15 installation, with that RF ground.
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Post by Druid Hills Radio on Mar 7, 2018 13:41:55 GMT
Amateur radio operators have been successfully using non straight radials for a long time. They can certainly bend around obstacles & still work as an RF ground. Commercial AM radio stations routinely bend the radials to fit property constraints.
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