minibeam.nec

zip contains tool for Antenna Modelling with examples

CE Minibeam

SY W = 6
SY H = 3.5
SY S = 3
SY R = 2
SY HD = 1/12
SY VD = .375/12

GW	1	11	S	-W	0	S	W	0	HD

GW	2	4	S	W	0	S	W	H	VD
GW	3	1	S	W	H	R	W	H	VD
GW	4	8	R	W	H	R	W	-H	VD
GW	5	1	R	W	-H	S	W	-H	VD
GW	6	4	S	W	-H	S	W	-1/6	VD

GW	7	4	S	-W	0	S	-W	H	VD
GW	8	1	S	-W	H	R	-W	H	VD
GW	9	8	R	-W	H	R	-W	-H	VD
GW	10	1	R	-W	-H	S	-W	-H	VD
GW	11	4	S	-W	-H	S	-W	-1/6	VD


GW	12	11	-S	-W	0	-S	W	0	HD

GW	13	4	-S	W	0	-S	W	H	VD
GW	14	1	-S	W	H	-R	W	H	VD
GW	15	8	-R	W	H	-R	W	-H	VD
GW	16	1	-R	W	-H	-S	W	-H	VD
GW	17	4	-S	W	-H	-S	W	-1/6	VD

GW	18	4	-S	-W	0	-S	-W	H	VD
GW	19	1	-S	-W	H	-R	-W	H	VD
GW	20	8	-R	-W	H	-R	-W	-H	VD
GW	21	1	-R	-W	-H	-S	-W	-H	VD
GW	22	4	-S	-W	-H	-S	-W	-1/6	VD

GS	0	0	ft
GE	0
EX	6	1	6	00	1.0	0.0
EX	6	12	6	00	-.85	.53
'
GN	-1
FR	0	1	0	0	 14.05
EN

'This is an experimental small beam for 20 meters.  it has a wingspan of 12 feet,
'a height of 7 feet, and a 6-foot boom.  When experimenting, it's much easier to
'specify element currents and leave phasing-line or parasitic-coupling details
'for later.  This lets you quickly determine the maximum gain and F/B for various
'configurations.  The negative impedance at one source just means that power is
'flowing toward the source rather than away from it.  This power comes from the
'the other element via mutual coupling.