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Old 10-10-2005, 08:10 PM   #16
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No black box.
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Old 10-11-2005, 04:06 AM   #17
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I haven't tried this my self.

It seems logical that you take the loop wire and connect one end to the wire in the middle of the coax and the other end to the wire around the coax (shield). If you use resistor place it in the middle of the loop.

18 gauge speaker wire seems to be the most recommended wire for the loop and 5 watt, 420 ohm, 1% tolerance for the resistors. I don't see any harm in higher tolerance resistor if people are getting good results without the resistor.
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Old 01-19-2013, 09:19 PM   #18
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In the black box is a toroidal core. Basically a iron core donut. One end has a thin copper wire wrapped around it a certain amount of times from the loop wire. The other end of the donut also has copper wire wrapped around it connecting the center conductor of the bnc to the shield. No direct contact between the loop wire and the bnc cable. Inductance transfer.

Originally Posted by Tres View Post
The part that is under the track is just 18AWG stranded wire.

The length of the loop determines if you need the resistor or not.

However, the the black box and coax is the hard part.
I have tried to make one a few times with very little luck.
There's some magic in the black box that is filled with epoxy...
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