122
Fiber Optics
FRDA/FRRA Series RF Attenuation Requirements
The RF output level from the optical receiver module varies consider-
ably over its operational optical input range. It is also dependent upon
the transmitter’s channel loading, its resultant RF input level and the
FRRA/FRDA RF output capability. In order not to overload the ampli-
fier section input, an internal attenuator must be installed. To find the
recommended attenuator value, first determine the receivers opti-
cal input level as noted in the "Input Optical Power”. Refer to the
Configuration Table below, locate the power monitor voltage or
input dBm in the left hand columns. Read across on the corre-
sponding row to find the value required.
G
R
E
E
N
L
E
D
Model
FRRA-S4A-860P
CH. Loading
110 CH.
Output Level
34/42
Optical Input
dBm mW
-10
0.10
-9
0.13
-8
0.16
-7
0.20
-6
0.25
0 dB
-5
0.32
2 dB
-4
0.40
4 dB
-3
0.50
6 dB
-2
0.63
8 dB
-1
0.79
10 dB
0
1.00
12 dB
1
1.26
14 dB
2
1.58
16 dB
3
2.00
18 dB
4
2.51
5
3.16
Increase Optical Input Power
Orange Optical LED Indication
Decrease Optical Input Power
Red Optical LED Indication
Recommended
Attenuator
Value
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 ...