5
FRRA Series
Instruction Manual
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
G
R
E
E
N
L
E
D
Increase Optical Input Power
Orange Optical LED Indication
Decrease Optical Input Power
Red Optical LED Indication
Approximate
External
Attenuator Value
Required
Attenuator Selection
The RF output level from the optical receiver module varies considerably over its operational optical input range.
It is also dependent upon the transmitter’s channel loading, its resultant RF input level and the FRRA’s RF output
capability. In order not to overload the amplifier section input, an attenuator must be installed in the “RF Loop” on
the rear panel. With the optical source and AC power connected, measure the RF signal level at “RF Loop” output
connector. Choose the appropriate attenuator value to set this level to +5 dBmV, ± 5 dB. A Blonder Tongue model
FAM-xx (Stock No. 4006A-xx) or equivalent attenuator can be used for this application. Install the attenuator on the
RF loop output connector. Check that the d5 dBmV nominal signal level has been obtained, or change value
accordingly. Install a coaxial jumper between the attenuator and the RF Loop input. Note that measured levels below
0 dBmV (without attenuator) indicates a low optical input and should therefore be investigated. The FRRA gain and
slope controls can now be adjusted for desired output.
Figure 4 - Configuration Table
Figure 5 - Rack Mount Rear Panel
BLONDER TONGUE
LABORATORIES, INC.
CAUTION:
FOR CONTINUED
PROTECTION AGAINST
FIRE HAZARD, REPLACE
ONLY WITH SAME TYPE FUSE
RF OUT
FRRA-S4S-860-43P
STOCK NO. 7411P84BS
FRRA-S4A-860-43P
STOCK NO. 7411P84B
OPTICAL
INPUT
117V,
60 Hz
0.39A
0.75A
250V
SLO-
BLO
0 TO +10 dBmV
INPUT
OUTPUT
RF LOOP
FAM ATTENUATOR
(AS REQUIRED)
M A D E I N U S A
COAXIAL JUMPER
Содержание FRRA-S4A-860-43P
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