210
Antenna Spacing Chart
Dimensions are in inches
Dimension Notes:
A) The minimum
horizontal
spacing
between
the tower
structure and
the antenna
crossbar.
B) The
recommended
vertical spacing
for a gain
of 3 dB.
B/2) The minimum vertical spacing between the antenna
crossbar and adjacent mechanical structures.
C) The recommended horizontal spacing for a gain of 3 dB.
D) The minimum spacing between antennas of different channels
and is the figure given for the antenna with the lowest frequency
Formulae:
One Wavelength in space . . . . . . . . . . . . . . . .
λ
(inches) =
11811
Freq. in MHz
One Wavelength in 75 Ohm coax (solid)
λ
(inches) =
7783
Freq. in MHz
One Wavelength in 75 Ohm coax (foam). . . .
λ
(inches) =
9565
Freq. in MHz
Antenna Nulling (finding H) . . . . . . . . . . . . . . . . . . d (
λ
) =
1
2 sin
φ
Channel
A
B
C
D
No.
2/3
λ
1
λ
1/2
λ
2
113
138
208
104
3
101
125
188
94
4
91
115
172
86
5
78
100
150
75
6
72
93
139
70
FM
72
80
120
60
7
40
44
67
33
8
39
43
65
32
9
37
42
62
31
10
36
40
61
30
11
35
39
59
29
12
34
38
57
29
13
34
37
55
28
Summary of Contents for AMM-806
Page 86: ...79 TVCB PC Installation ...
Page 93: ...86 SMI Installation Torque Patterns 1 Start Here 2 3 4 5 6 1 Start Here 2 3 4 4 PORT 8 PORT ...
Page 125: ...118 Fiber Optics Fiber Loss vs Path Length Single Mode 1550 nm ...
Page 156: ...149 Cable TV Channel Format NTSC NTSC Composite Video Waveform ...
Page 157: ...150 US Frequency Spectrum ...
Page 158: ...151 FCC Aeronautical Band Frequencies Used for Communication and Navigation ...
Page 175: ...168 Common CATV Symbols ...
Page 176: ...169 Common CATV Symbols ...
Page 177: ...170 Digital L Band Distribution Symbols ...
Page 178: ...171 Digital L Band Distribution Symbols ...
Page 183: ...176 Typical Cable Attenuation Chart in dB 100 Feet 68 F 20 C ...
Page 187: ...180 Echo Rating Graph ...
Page 188: ...181 Signal to Interference Limits Non Coherent Carriers ...
Page 190: ...183 Heterodyne Modulator Analog ...
Page 191: ...184 Heterodyne Processor Analog ...
Page 213: ...206 Multiplexers ...
Page 285: ...Rev 8 0 ...