CM 40M Phased Inverted Delta Loops
CM center-fed for horizontal polarization
CM PVC wire insulation added to model 5/09
CM feedline matching sections added 5/09
CM 
CM changed spacing from 17 to 18 feet,
CM added automatic corrections for Vf of line,
CM and recalculated phasing section - 10/09
CM 
CM NOTE: radius of #14 AWG wire is in FEET and
CM division by 3.28 in transmission line lengths are
CM work-arounds for NEC unit conversion issues
CM 
CM model by Paul Lamattina - N2PL - May 2009
CM 
CE
SY wire_len=138			'overall loop dimension
SY top_hgt=35			'flat-top height
SY top_len=61			'flat-top length
SY leg_len=(wire_len-top_len)/2	'diagonal sides length
SY dx=(top_len/2)		'1/2 top_len
SY x=dx^2			'1/2 top_len squared
SY v=leg_len^2			'leg_len squared
SY dy=sqr(v-x)			'distance from top down to feed
SY fp_hgt=top_hgt-dy		'feed point height
SY spacing=18			'element spacing
SY match_len=27.5ft		'matching section length (1/4 wave RG-11 Foam)
SY phase_len=18.2ft		'phasing section length (18.2 ft in RG-8 = 72.2 degrees)
SY ser_stub=33ft			'series matching stub (33 feet in RG-8)
SY par_stub=30.15ft		'open final parallel matching stub (30.15 feet in RG-8)

GW	1	40	-dx	0	top_hgt	dx	0	top_hgt	.0027	'flat-top wire 1
GW	2	20	-dx	0	top_hgt	-0.25	0	fp_hgt	.0027	'- leg 1
GW	3	20	0.25	0	fp_hgt	dx	0	top_hgt	.0027	'+ leg 1
GW	4	1	0.25	0	fp_hgt	-0.25	0	fp_hgt	.0027	'feed point 1
GW	11	40	-dx	spacing	top_hgt	dx	spacing	top_hgt	.0027	'flat-top wire 2
GW	12	20	-dx	spacing	top_hgt	-0.25	spacing	fp_hgt	.0027	'- leg  2
GW	13	20	0.25	spacing	fp_hgt	dx	spacing	top_hgt	.0027	'+ leg 2
GW	14	1	0.25	spacing	fp_hgt	-0.25	spacing	fp_hgt	.0027	'feed point 2
GW	21	1	0.25	0	5	-0.25	0	5	.0027	'match point 1
GW	22	1	0.25	spacing	5	-0.25	spacing	5	.0027	'match point 2
GW	31	1	.25	0	2	-.25	0	2	.0027	'series stub end
GW	32	1	.25	10	2	-.25	10	2	.0027	'parallel stub end
GS	0	0	ft	' 0.3048
GE	-1

LD	7	1	1	40	4.5	0.001422	'PVC insulation (radius in meters)
LD	7	2	1	20	4.5	0.001422	'PVC insulation
LD	7	3	1	20	4.5	0.001422	'PVC insulation
LD	7	11	1	40	4.5	0.001422	'PVC insulation
LD	7	12	1	20	4.5	0.001422	'PVC insulation
LD	7	13	1	20	4.5	0.001422	'PVC insulation

GN	2	0	0	0	10	0.001
EK

EX	0	31	1	0	1	0			'Voltage source

TL	4	1	21	1	75	match_len/0.80	'/3.28	'matching 1
TL	14	1	22	1	75	match_len/0.80	'/3.28	'matching 2
TL	21	1	22	1	50	phase_len/0.66	'/3.28	'phasing section
TL	21	1	31	1	50	ser_stub/0.66	'/3.28	'series matching section
TL	31	1	32	1	50	par_stub/0.66	'/3.28	'parallel matching stub

FR	0	0	0	0	7.15	0

EN