one thing i've been pondering is a vertical colinear. 1/2 wave over 1/2
wave. i have not modeled it.

is there any free modeling software?

i noticed that you stated that phased arrays with elements separated by more
than 2 waves don't work well. i was thinking of a vertical array, either
inline or broadside.

Gravity

4NEC2?

http://home.ict.nl/~arivoors/Home.htm

Cheers Bob VK2YQA

gravity wrote:


is there any free modeling software?

"Bob Bob" wrote in message
...
4NEC2?

http://home.ict.nl/~arivoors/Home.htm

thanks Bob. that looks like it may do the trick.

Gravity

gravity wrote:
one thing i've been pondering is a vertical colinear. 1/2 wave over 1/2
wave. i have not modeled it.

is there any free modeling software?

You can use the free demo copy of EZNEC by driving the
collinear with two sources and varying the phase angle
between them. Then you can design an appropriate phasing
network. I don't think the lumped inductive reactance
available in EZNEC will yield an accurate phase shift
and the free demo will not handle enough segments to
model a helical coil.
--
73, Cecil http://www.qsl.net/w5dxp

"Cecil Moore" wrote in message
om...
gravity wrote:
one thing i've been pondering is a vertical colinear. 1/2 wave over 1/2
wave. i have not modeled it.

is there any free modeling software?

You can use the free demo copy of EZNEC by driving the
collinear with two sources and varying the phase angle
between them. Then you can design an appropriate phasing
network. I don't think the lumped inductive reactance
available in EZNEC will yield an accurate phase shift
and the free demo will not handle enough segments to
model a helical coil.
--

thanks, that plus the program Bob mentioned may get me started in modeling.

Gravity

73, Cecil http://www.qsl.net/w5dxp