[Antennas] BEAM_ANTENNAS

2003年12月15日 12:44:16 EST

Hi George
Read your note on your current antenna.
I have made a program to evaluate beam antenna patterns using your RX and 
antenna to obtain real data (not a simulation). By obtaining the pattern at 
different frequencies you can determine in which part of the band the beam gives 
the best front/back and beam width. Both of these factors are related to total 
gain as you might imagine and can get more info on this in the ARRL handbook 
and Antenna publications.
Another point is getting a good idea of the SWR across the band. A very wide 
SWR would probably indicate a lossy problem or very unusual detuning of the 
elements.
My program currently uses a computer joystick input and simple connections to 
the AGC or S meter signals. Am working on using the communications port of 
Kenwood and Yaesu computerized rigs and should have these working shortly.
You can check out the program by going to:
http://hometown.aol.com/azantennas
There you can download a demo program and see its many features that allow 
you to use a friend as a local signal source or use on the air signals that are 
unaware of your using them. The results have been very good and repeatable.
If this interests you, try it out and I'll send you a complimentary copy.
73 Tony K6AIA
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