CQM9C4X MK2 AOWA

CQM9C4X MK2 is an AOWA yagi designed for optimal performance in the 144 - 145MHz range. At first glance VSWR bandwidth might appear to be restricted and hence compromise stability, WRONG!

Take a really close look at all of the analysis data, note the results in 4nec2 and you will see that reactance has been contained to within very tight limits (+j12 to -j12 Ohms) and over a very wide frequency range (140 - 148.5MHz)!

Even though performance is extreme for the boom length Average Q-factor is low at only 30.96!

CQM9C4X MK2 design is only 80mm longer than Pop's EF0208 yagi yet seriously outperforms it! Much lower temperature and better G/T.

Azimuth Beamwidth 40° Elevation Beamwidth 45°

CQM9C4X MK2 - YO7 Analysis NEC-2 E/H-PLANE

NEC-2 E-PLANE

NEC-2 H-PLANE

CQM9C4X MK2 DIMENSIONS

DIMENSIONS

ELEMENT DIAMETERS

Single CQM9C4X MK2 in TANT

CQM9C4X MK2 IN TANT

Yagi Four-Stack CQM9C4X MK2 in TANT

Yagi Four-Stack CQM9C4X MK2 in TANT

Single YU7EF EF0208 in TANT

EF0208 IN TANT

Dimensions .ANT file (Symbolic Dimensions)

CQM9C4X MK2 AOP 15-08-2014
Free Space Symmetric
144.500 MHz
9 6063-T832 wires, millimeters
padia = 4.7625
dedia = 15.8750
rp = 0
dep = 228.0000
d1p = 332.0000
d2p = 656.0000
d3p = 1137.0000
d4p = 1729.0000
d5p = 2463.0000
d6p = 3267.0000
d7p = 3980.0000
r = 513.0000
de = 504.0000
d1 = 485.0000
d2 = 478.0000
d3 = 467.0000
d4 = 460.0000
d5 = 450.5000
d6 = 439.0000
d7 = 426.0000
1 rp -r 0 rp r 0 padia
1 dep -de 0 dep de 0 dedia
1 d1p -d1 0 d1p d1 0 padia
1 d2p -d2 0 d2p d2 0 padia
1 d3p -d3 0 d3p d3 0 padia
1 d4p -d4 0 d4p d4 0 padia
1 d5p -d5 0 d5p d5 0 padia
1 d6p -d6 0 d6p d6 0 padia
1 d7p -d7 0 d7p d7 0 padia
1 source
Wire 2, center

CQM9C4X.nec (Symbolic Dimensions)

CM GX 9 010
CM
CE
SY PADIA = 4.7625
SY DEDIA = 15.8750
SY RP = 0
SY DEP = 228.0000
SY D1P = 332.0000
SY D2P = 656.0000
SY D3P = 1137.0000
SY D4P = 1729.0000
SY D5P = 2463.0000
SY D6P = 3267.0000
SY D7P = 3980.0000
SY R = 513.0000
SY DE = 504.0000
SY D1 = 485.0000
SY D2 = 478.0000
SY D3 = 467.0000
SY D4 = 460.0000
SY D5 = 450.5000
SY D6 = 439.0000
SY D7 = 426.0000
GW 1 25 RP -R 0 RP R 0 (PADIA)/2
GW 2 25 DEP -DE 0 DEP DE 0 (DEDIA)/2
GW 3 25 D1P -D1 0 D1P D1 0 (PADIA)/2
GW 4 25 D2P -D2 0 D2P D2 0 (PADIA)/2
GW 5 23 D3P -D3 0 D3P D3 0 (PADIA)/2
GW 6 23 D4P -D4 0 D4P D4 0 (PADIA)/2
GW 7 23 D5P -D5 0 D5P D5 0 (PADIA)/2
GW 8 23 D6P -D6 0 D6P D6 0 (PADIA)/2
GW 9 21 D7P -D7 0 D7P D7 0 (PADIA)/2
GS 0 0 mm
GE 0
LD 5 1 0 0 30800000
LD 5 2 0 0 30800000
LD 5 3 0 0 30800000
LD 5 4 0 0 30800000
LD 5 5 0 0 30800000
LD 5 6 0 0 30800000
LD 5 7 0 0 30800000
LD 5 8 0 0 30800000
LD 5 9 0 0 30800000
GN -1
EK
EX 0 2 13 0 1 0 0 0
FR 0 0 0 0 144.5 0
EN

When calculating the element lengths remember that YO7/AOP/4nec2 shows the element half length so multiply the figure shown in the ELEMENTS TABLE above by two (X2). All parasitic elements including the Reflector are 3/16 Inch (4.7625mm) OD rod whilst the DE is 5/8 Inch (15.8750mm) OD tube.

CQM9C4X MK2 in 4nec2

VSWR

GAIN

IMPEDANCE

CQM9C4X MK2 Q-factor (Average Q = 30.96)

CQM9C4X MK2 Q-factor

EF0208 Q-factor (Average Q = 29.74)

EF0208 Q-factor

4CQM9C4X.nec