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"Shorted Turn" Phenomena ?

R

Robert11

Jan 1, 1970
0
Hello:

Have a receiving only simple long wire antenna strung out my window for my
short-wave radio. Will be stringing up a new one, with different supports,
etc.

Got to wondering about this:

If the antenna wire is fastened using, e.g., metal supports, metal pulleys
or rings, that completely go 360 deg. around the wire (but are spaced from
it essentially by the wire insulation thickness, is there
any effect from the "shorted-turn" phenomena ?

Or, does the shorted turn problem only arise for a varying magnetic flux
field, and would not be applicable in this case ?

(Again, this is a receiving only application, but I guess you could argue
that there is an actual E and H field
in this receiving antenna)

Thanks,
Bob
 
T

TimPerry

Jan 1, 1970
0
Robert11 said:
Hello:

Have a receiving only simple long wire antenna strung out my window for my
short-wave radio. Will be stringing up a new one, with different supports,
etc.

Got to wondering about this:

If the antenna wire is fastened using, e.g., metal supports, metal pulleys
or rings, that completely go 360 deg. around the wire (but are spaced from
it essentially by the wire insulation thickness, is there
any effect from the "shorted-turn" phenomena ?

in electronics everything affects everything the question is how much? in
this case not much.

first, its not a shorted turn if the wire is insulated... it just a turn or
loop. it adds inductance, in this case making the antenna seem just a bit
longer electrically.

second, the longwire should be fastened to an insulator (like a ceramic egg)
not a pulley or metal support.

safety note: some form of lightning arrester mounted outside the house and
well grounded is recommended.
 
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