[TowerTalk] RE : non inductive resistors
on4kj at skynet.be
Wed Mar 1 10:10:52 EST 2006
A water-pipe freezing protection low power heater might do the job as
Jim pointed out.
73 Jos on4kj
De : towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] De la part de Jim Lux
Envoyé : mercredi 1 mars 2006 12:40
À : towertalk at contesting.com
Objet : [TowerTalk] non inductive resistors
At 03:14 PM 2/27/2006, Fabio Grisafi - IT9GSF wrote:
>I wish to know how could I build non-inductive 600-800 Ohm 1KW
>to use with rhombic antennas.
Counter wound or bifilar wound nichrome wire on a suitable form might
work. You can find the nichrome wire in a toaster or electric heater.
the heater is, say, 2.2kW, then it's drawing about 10 Amp from 220V
which implies that the resistance is around 22 ohms. If you can find a
smaller heater (higher resistance).. say, around 1/2 Amp at 220V (100W)
you'll be in the right ballpark (perhaps an aquarium heater?)
A solution of copper sulfate in water makes a great non inductive high
power resistor, but the resistance will change with temperature.
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