[Elecraft] Problem with KAT2?

[Jim Brown]

On 7/10/2013 7:42 PM, Don Wilhelm wrote:
> There is one possibility that your 51 ohm load (measured at DC) is not 
> a good 51 ohm pure resistance at the frequency you were measuring. 
> Borrow an antenna analyzer and test your load at the frequency of 
> operation. 

There's also the simple issue of tolerance on both the resistor and the 
calibration of the analyzer.  A 1 ohm error in a 50 ohm resistor  is 
only 2%, and many dummy loads have a much wider tolerance.  I recently 
went searching for calibration loads for my VNA. One rated for a watt or 
so with a 4% tolerance goes for hundreds of dollars.

73, Jim K9YC