[Elecraft] Need K3 dB Measurements on new 160M Antenna

[Jack Smith]

  In evaluating diversity gain of a Z1501D active antenna against 
various transmitting antennas, I use two spectrum analyzers, one 
connected to the two antennas to be evaluated. The spectrum analyzers 
are set for 0 Hz span and a 100 second sweep, providing a signal 
strength data point every 100 ms.

Under software control over the IEEE-488 bus, both spectrum analyzers 
start sweeps at a synchronized time. The signal strength data from each 
is saved to the controlling computer hard drive. The sweeps are repeated 
and data collected for a reasonable time, usually 24 hours per frequency.

The data is then post processed to derive useful statistics, such as the 
probability that antenna A provides a stronger signal than antenna B as 
a percentage of time, in the form of signals from "Antenna A are X dB 
stronger (or weaker) than Antenna B Z percent of the time."

Of course, other interesting things can be observed from the data, such 
as fading statistics - is it Rician or Rayleigh fading, for example.

Writing this up is on my list of things to get to, but there are many 
things ahead of it in the list.

A short answer is that in fact even modest separation (100 feet or less) 
between the broadband active antenna and a wire antenna can provide 
useful diversity gain even at 7 MHz and some gain at 3.6 MHz.

Jack K8ZOA