[Elecraft] OT-Wattmeter Errors

[Alan Bloom]

On Fri, 2009-02-13 at 08:00, Don Wilhelm wrote:
...
> The section in Experimental Methods of RF Design has several methods of 
> maesuring RF power, and all will be more accurate than most wattmeters 
> if the dummy load is known to be non-reactive at the frequency of use 
> and the exact resistance is known.
...

In many inexpensive dummy loads the resistance changes significantly as
it heats up, a significant source of error.

Al N1AL