[TowerTalk] RE : non inductive resistors

[hermans]

A water-pipe freezing protection low power heater might do the job as
Jim pointed out.

73 Jos on4kj 

-----Message d'origine-----
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 
>resistors
>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.
If 
the heater is, say, 2.2kW, then it's drawing about 10 Amp from 220V
main, 
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. 
http://home.earthlink.net/~jimlux/hv/rwater.htm

Jim 


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