204
Wavelength & Antennas
1. Vertical antenna separation
Antennas for different frequencies mounted on a common mast
should be separated by at least the length of the longest element
of the largest antenna.
2. Wavelength in
inches is given by:
3. Approximate length of a quarter wave whip antenna in
inches is given by:
l = Wavelength
F = Frequency, MHz
4. Distance to the
horizon is given by:
Assume smooth earth D = Distance, statute miles
H = Height, feet
5. Maximum Line of
Sight is Given by:
6. Radio Frequency Propagation
In free space, it is approximately 186,000 mi/sec or 982 ft/msec.
Multiply by the velocity of propagation to determine the distance
in coaxial cable.
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 ...