Re: [loopantennas] Plastics usage (was New file uploaded to loopantennas)
- Most crystal radio set builders have settled on Polystyrene
as the best material for highest-Q coil forms. Some crystal set
builders have built coils with Qs up to 2000 and above.
Once you get a good coil form material then the type of
wire used makes the biggest difference in Q with Litz Wire being
However receiving loop builders don't necessarily want the
highest Q as it will narrow the bandwidth too much making
the tuning very narrow and peaky and the audio sound narrow and muffled.
Some builders purposely use plain enameled wire instead
of Litz Wire for this reason. It will need to be trial and error
to find the best all-around Q without being too narrow.
But if you are going for all-out Q then try to use Polystyrene
for the coil form or supports and heavy Litz Wire like #660/46 for
broadcast band use.
73 - Todd WD4NGG
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File : /GB2235337A.pdf
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Description : LiniPlex loop GB Patent GB2235337A
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