SIMULATIONS OF A 2 and 4 BAY ARRAY
OF YAGI ANTENNAS ON 6 METERS
50.150 MHz
.......[Opt Stacking]........ .......[75% Stacking].........
1 Ant Spacing 4 Ant 2E ant 2H ant Spacing
4 Ant 2E ant 2H ant
TYPE OF
L GAIN E H
Gain Gain Gain E H
Gain Gain Gain Z
VSWR
ANTENNA
(WL) (dBd) (M) (M) (dBd) (dBd)
(dBd (M) (M) (dBd) (dBd) (dBd)
(ohms) Band Width
Cushcraft A50-3S
0.29 5.26 5.55 3.84 9.49 8.32
6.46 4.16 2.87 8.69 7.84 6.21
40.0 1.10:1
DK7ZB 3 28 ohm
0.31 5.74 5.64 3.82 10.00 8.76
7.05 4.23 2.86 9.32 8.34 6.90
28.6 1.11:1
DK7ZB 3 12.5 ohm 0.31 6.34
5.94 4.11 12.52 9.35 9.45 4.46 3.08
11.47 8.95 8.87 13.1
1.29:1
DK7ZB 4 28 ohm 0.36
6.26 5.84 4.06 11.88 9.27 9.39 4.38
3.04 11.36 8.83 8.82 28.6
1.02:1
YU7EF 4
0.39 6.62 5.94 4.23 12.74 9.62
9.68 4.58 3.17 11.68 9.17 9.15
50.0 1.05:1
DK7ZB 3 28 ohm
0.42 6.62 5.91 4.20 12.59 9.59
9.56 4.43 3.15 11.64 9.15 9.12
27.7 1.14:1
DK7ZB 4 12.5 ohm 0.48 7.60
6.54 4.99 13.72 10.59 10.67 4.91 3.74 12.52
10.10 10.05 11.1 1.39:1
Telrex 4
0.59 7.53 6.54 5.08 13.40 10.47 10.31
4.91 3.81 12.41 10.02 10.15 52.3
1.11:1
HyGain 4 VB-64DX 0.59 7.55
6.59 5.16 13.45 10.50 10.36 4.94 3.87 12.40
10.06 10.16 48.5 1.15:1
Cushcraft A50-5S 0.59 7.60
6.52 5.11 13.53 10.56 10.46 4.89 3.83 12.52
10.09 10.19 40.8 1.05:1
DK7ZB 4 12.5 ohm 0.60 8.15
6.77 5.46 14.21 11.15 11.16 5.08 4.10 13.01
10.69 10.66 14.7 1.39:1
Directive 4
0.62 8.17 6.89 5.49 14.23 11.14 11.17
5.17 4.12 13.11 10.71 10.69 12.9
1.54:1
YU7EF 5C
0.69 7.99 6.52 5.08 13.97 10.96 10.91
4.89 3.81 12.84 10.50 10.47 50.1
1.03:1
DK7ZB 5 50 ohm
0.71 8.44 6.92 5.55 14.35 11.39 11.28
5.19 4.16 12.99 10.94 10.75 49.3
1.11:1
OZ3SW 4 (OZ6FRS) 0.73
7.79 6.43 4.97 13.49 10.71 10.43 4.82 3.73
12.67 10.32 10.30 31.7 1.10:1
DK7ZB 5 28 ohm
0.75 8.60 7.02 5.64 14.53 11.56 11.47
5.27 4.23 13.16 11.11 10.89 29.0
1.10:1
YU7EF 5A
0.75 8.59 6.97 5.64 14.51 11.54 11.12
5.23 4.23 13.07 10.91 10.84 49.4
1.06:1
N6CA 4
0.76 8.72 7.02 5.76 14.65 11.67 11.60
5.27 4.32 13.25 11.21 11.00 20.1
1.32:1
G0KSC 5 LFA
0.79 8.83 7.05 5.72 14.80 11.77 11.77
5.29 4.29 13.62 11.32 11.24 49.5
1.10:1
Telrex 5
0.80 8.88 7.24 5.98 14.82 11.83 11.78
5.43 4.49 13.39 11.37 11.09 20.3
1.28:1
I0JXX 5
0.81 9.03 7.53 6.33 14.98 11.98 11.95
5.65 4.24 13.24 11.49 11.11 18.1
1.37:1
W5WVO CC A50-5S MOD 0.87 9.10 7.35
6.09 15.19 12.07 12.16 5.51 4.57 13.65 11.57
11.34 16.1 1.36:1
Directive 5
0.88 8.93 7.02 5.76 14.86 11.87 11.84
5.42 4.32 13.62 11.45 11.24 23.4
1.09:1
Mē 6M5X
0.91 9.39 7.59 6.39 15.36 12.35 12.33
5.69 4.79 14.03 11.86 11.70 13.9
1.48:1
BQH 5
0.94 9.45 7.72 6.54 15.40 12.40 12.35
5.79 4.91 13.90 11.91 11.60 13.5
1.27:1
BV 6
0.98 9.47 7.72 6.56 15.45 12.43 12.40
5.79 4.92 14.08 11.96 11.73 47.6
1.13:1
YU7EF 6 W1
0.99 9.41 7.59 6.41 15.37 12.37 12.32
5.69 4.81 13.85 11.87 11.58 50.8
1.02:1
Cushcraft A50-6S 1.00 8.75
6.92 5.64 14.52 11.66 11.49 5.19 4.23 13.08
11.18 10.90 38.6 1.02:1
DK7ZB 5 18 ohm
1.00 9.36 7.65 6.47 15.32 12.32 12.28
5.74 4.86 13.70 11.82 11.37 17.7
1.35:1
DK7ZB 5 12.5 ohm 1.00 9.53
7.68 6.52 15.50 12.49 12.46 5.76 4.89 13.95
11.99 11.64 13.8 1.39:1
G0KSC 5 LFA
1.10 9.27 7.16 5.84 15.18 12.20 12.19
5.37 4.38 14.04 11.76 11.65 52.2
1.31:1
YU7EF 6
1.15 9.67 7.62 6.43 15.67 12.63 12.65
5.72 4.82 14.42 12.16 12.04 48.6
1.11:1
K6STI 5
1.15 10.32 8.27 7.24 16.26 13.26 13.25
6.20 5.43 14.85 12.75 12.51 12.5
1.67:1
DK7ZB 6 50 ohm
1.19 9.96 7.85 6.73 15.63 12.88 12.80
5.89 5.04 14.36 12.49 12.10 45.8
1.20:1
DK7ZB 6 28 ohm 1.20
10.19 8.12 7.02 16.15 13.15 13.13 6.09 5.27
14.79 12.65 12.44 27.2 1.07:1
HyGain VB-66DX 1.21
8.97 7.35 6.04 14.45 11.80 11.37 5.51 4.53
13.01 11.37 10.98 37.7 1.12:1
W1JR 6
1.21 9.47 7.35 6.17 15.39 12.39 11.39
5.51 4.63 13.88 11.89 11.60 45.1
1.08:1
Tilton 7
1.22 9.99 7.75 6.82 15.90 12.98 12.88
5.84 5.12 14.33 12.39 12.11 27.0
1.20:1
N6CA 6
1.22 10.08 7.91 6.80 16.05 13.03 13.03
5.94 5.10 14.80 12.55 12.44 22.1
1.17:1
I0JXX 6
1.23 10.27 8.66 7.65 16.25 13.23 13.23
6.49 5.74 14.73 12.67 12.36 15.7
1.52:1
N1DPM 5 Hy-gain mod 1.28 9.75 7.47
6.29 15.50 12.62 12.55 5.60 4.72 14.14 12.15
11.93 15.4 1.44:1
DK7ZB 7 50 ohm
1.29 10.12 8.05 7.00 16.09 13.07 13.05
6.04 5.25 14.52 12.55 12.23 45.5
1.03:1
N1DPM 7 KLM mod 1.31
10.02 7.91 6.84 15.84 12.90 12.82 5.94 5.13
14.18 12.39 12.04 205.0 1.04:1
YU7EF 7X
1.33 10.02 7.78 6.68 15.88 12.94 12.86
5.84 5.01 14.32 12.41 12.16 51.5
1.02:1
Mē 6M7
1.33 10.35 8.09 7.02 16.28 13.29 13.28
6.07 5.27 15.04 12.81 12.71 31.4
1.26:1
YU7EF 7
1.49 10.58 8.20 7.18 16.49 13.51 13.48
6.15 5.39 15.01 12.99 12.76 49.8
1.03:1
Directive 7
1.56 10.92 8.50 7.47 16.86 13.87 13.86
6.37 5.60 15.68 13.40 13.30 23.8
1.14:1
DK7ZB 7 28 ohm
1.56 10.88 8.58 7.59 16.85 13.83 13.83
6.43 5.69 15.48 13.33 13.14 27.7
1.15:1
Mē 6M7JHV
1.56 10.86 8.42 7.41 16.78 13.79 13.78
6.32 5.56 15.43 13.30 13.13 30.1
1.32:1
I0JXX 7
1.57 11.38 9.42 8.54 17.37 14.34 14.38
7.07 6.40 16.03 13.80 13.64 30.2
2.00:1
K6STI 6
1.62 11.17 9.38 7.98 17.13 14.16 14.09
7.03 5.99 15.61 13.62 13.23 18.1
1.47:1
Cushcraft 617-6B 1.69 10.17
8.09 7.08 15.89 13.01 12.90 6.07 5.31 13.99
12.48 11.95 33.0 1.16:1
N1DPM 7 617-6B mod 1.69 10.94 8.34
7.35 16.85 13.87 13.86 6.26 6.51 15.59 13.38
13.29 20.7 1.26:1
YU7EF 8
1.88 11.29 8.70 7.75 17.20 14.21 14.20
6.53 5.81 15.85 13.70 13.58 49.0
1.11:1
K5GW 8
1.96 11.77 9.52 8.70 17.78 14.73 14.76
7.14 6.53 16.26 14.15 13.95 52.9
1.13:1
BQH 8
2.00 11.95 9.62 8.74 17.94 14.91 14.93
7.22 6.56 16.49 14.36 14.18 50.1
1.18:1
Mē 6M2WLC
2.00 11.76 9.28 8.38 17.67 14.68 14.68
6.96 6.27 16.19 14.14 13.96 35.8
1.27:1
DK7ZB 8
2.05 11.83 9.33 8.46 17.75 14.76 14.76
7.00 6.34 16.29 14.21 14.03 27.1
1.16:1
K6STI 7
2.05 12.12 9.94 9.14 18.10 15.05 15.11
7.46 6.86 16.52 14.45 14.26 13.7
1.76:1
N6CA 8
2.07 11.95 9.52 8.66 17.89 14.88 14.91
7.14 6.49 16.53 14.36 14.23 21.5
1.20:1
YU7EF 9
2.16 11.84 9.14 8.27 17.74 14.75 14.76
6.85 6.20 16.44 14.25 14.16 48.9
1.08:1
Mē 6M8GJ
2.18 12.12 9.68 8.42 17.98 15.05 14.99
7.26 6.32 16.48 14.50 14.27 16.4
1.15:1
ZL3NW 10
2.20 11.68 9.18 8.34 17.62 14.61 14.66
6.89 6.26 16.22 14.08 13.90 62.1
1.13:1
BQH 9
2.28 12.19 10.17 9.28 18.24 15.18 15.21 7.63
6.96 16.76 14.59 14.39 50.9
1.14:1
DK7ZB 9
2.34 12.26 9.94 9.09 18.25 15.22 15.24
7.46 6.82 16.80 14.66 14.50 28.3
1.10:1
Mē 6M9KHW
2.51 12.72 10.53 9.73 18.72 15.68 15.71 7.90
7.30 17.33 15.12 15.01 20.7
1.21:1
K6STI 8
2.54 12.73 10.72 10.00 18.78 15.67 15.75 8.04 7.50
17.12 15.04 14.89 17.5 1.65:1
Mē 6m25WLC
2.57 12.63 10.41 9.68 18.65 15.58 15.64 7.80
7.26 17.27 15.04 14.95 28.8
1.30:1
YU7EF 10
2.59 12.50 10.06 9.14 18.44 15.45 15.45 7.54
6.85 17.36 15.00 14.94 50.5
1.07:1
Mē 6M11JKV
3.52 13.99 11.94 11.33 19.92 16.92 16.93 8.96 8.50
18.67 16.38 16.36 27.3 1.25:1
BVO 18 Rope Yagi 5.03 15.01
13.39 12.81 20.95 17.95 17.95 10.05 9.61 19.66 17.39
17.37 52.4 1.11:1
Notes:
1. All antennas except
G0KSC antennas were calculated using NEC Yagis 3.05 by K6STI. NEC Yagis 3.05
within
YO7.5 was used to calculate VSWR. G0KSC antennas were calculated in
NEC Wires 2.06 by K6STI. This was the easiest
and most accurate method of calculation considering many of the
antennas have tapered elements and mounting
brackets.
2. All antennas are in free space and horizontally polarized.
3. One wavelength at 50.150 MHz is 5.98M or 19.62'
4. "E" represents the horizontal plane; "H" represents the vertical plane.
5. Z ohms is the
natural impedence of a single antenna in free space.
6. VSWR Bandwidth is based on 50.00 - 50.300 MHz with a reference of 1.00:1 at
50.150 MHz
7. G/T is not included
in this table as the ratio between cold sky and ground noise is small. ie 2400K
cold sky
versus 3000 - 4000K ground noise. Therefore, G/T does not produce
useful results on this band. Very Low side lobes
and F/R on this band produce no specific improvement in G/T based
on pure sky noise and ground noise. Assuming
reasonable side lobes, F/R and good VSWR bandwidth, Gain is the
most critical parameter on 6M.
8. Force 12 or Create antennas are not included as no data is available from the manufacturers.
Using this Chart:
While Gain is important
on on this band, other factors like ease of matching and wet weather performance
should be
considered in the your decision making. Antennas with 50 ohm feed systems and
good VSWR bandwidth (Q) may be the best
choice depending on your location. Although there is no advantage to low
sidelobe and F/R antennas based on sky noise
and ground noise (G/T) these antennas may provide a benefit if you have local
noise that is in directions which a low
side lobe antenna provides additional suppression.
Stacking is an issue on
this band due to the large optimum spacings. While the longer antennas are very
attractive
because of there superior gain, if severly understacked, the gain advantage may
be quickly lost.
LIONEL H. EDWARDS
VE7BQH
ve7bqh@shaw.ca
Issue 3 June 30, 2009
Issue 1: Initial Issue
Issue 2: Add Cushcraft 617-6B and Mē 6M25WLC
Issue 3: Add N1DPM 7 617-6b mod, N1DPM 7 KLM mod, N1DPM 5 Hy-gain mod