"Max Power" wrote in message
...
Has anyone ever designed a SW transmission system using curtain arrays
that has a beamwidth of 2.5 to 5 degrees?
Most standard curtain arrays [HR 4/4/1 to 12/6/1] have 15 to 30 degrees of
beamwidth.

It's gonna be big! A 3 meter diameter dish at 4 GHz has a beanwidth of 1.75
degrees. Scale that to 4 MHz and it will need a diameter of 3 kilometers.
For 5 degree beamwidth, probably about 1 kilometer diameter for 4 MHz, and
400 meter diameter at 10 MHz. An array will have similar dimensions for
similar results.

Tom