Rick N6RK wrote : It would be interesting to see if really short beverages exhibit these nulls. Otherwise, useful as they may be, they are acting a degenerate low dipoles, but still beat listening on the transmit antenna.
--------------------------------- I too wondered what the pattern of the beverage looked like as its length was reduced so I did a simple model using EZNEC demo for a terminated 1.8 MHZ beverage (500 ohm termination) mounted 5 feet above ground using a ground conductivity of 0.005 S/m, for beverage lengths of 150 feet to 550 feet in increments of 50 feet, and I created a simple website where you can view the progression of the patterns (3D pattern looking down at the pattern from above). The website URL where you can view the patterns I created is _https://sites.google.com/site/beverageantenna/_ (https://sites.google.com/site/beverageantenna/) and if you click on a pattern it will expand in size for easier viewing. I am by no means an expert on using EZNEC, but I believe the plotted patterns do provide insight into the behavior of the beverage at different lengths. It looks to me like lengths of 300 feet or more start to become very interesting (using the parameters I used) but this does not mean shorter lengths are not useful (similar to what Rick said), but will let everyone draw their own conclusion from the plots. Note : the 500 ohm termination provided a reasonably flat SWR versus frequency regardless of the lengths I used when analyzed from 1 to 7 MHZ. 73's Don (wd8dsb) _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
