[Boatanchors] radio frequency no Induction resistance

[Al Klase]

Hi Bill,

Where do I start?  Common wire-wound power resistors are 
inductive as well as resistive because of the solenoid 
winding of the resistance winding.  This generally precludes 
their use at RF.  So, for these applications we have 
"non-inductive" resistors of various sorts.

"Terminator" and "dummy load" are pretty much synonymous. 
I'd say "terminator" if I was placing a 50-ohm resistor at 
the end of a piece of coax to preclude reflections.  While, 
I'd say dummy load if I was connecting a 300-watt 50-ohm 
resistor to the output of my transmitter.  It's really the 
same thing.

Use as a dummy load: Just hook it up.  It will look like a 
RESONATE antenna of the chosen impedance (resistance).  A 
"phantom antenna" generally contains a non-inductive 
resistor in series with a capacitor to simulate the COMPLEX 
IMPEDANCE of a short non-resonate antenna.

Probably more than you wanted to know.

Regards,
Al

William L Howard wrote:
> I just got a WW II Japanese item which looks like a resistance
> substitution box. According to the Japanese data plate, it is a
> 
> "radio frequency no Induction resistance"
> 
>  which is  generally used in a laboratory or factory.
> Laboratory and  factory use this resistance many way, like as
> resistance substitution box, terminator, dummy load etc.
> 
> What is a terminator (No Arnold Swartzenegger jokes please)
> and how can it be used as a dummy load?
> 
> 

-- 
Al Klase - N3FRQ
skywaves@bw.webex.net
Flemington, NJ 08822
Web Page:  http://www.webex.net/~skywaves/home.htm