3-3
WRR-802A (U)
3-2-1. Tuner Unit Adjustment
1. Muting level and RF level adjustment
Perform this adjustment when the Muting levels deviate
from the specification.
This adjustment is performed automatically by the learning
function of the WRR-802A RSSI learning.
Preparation
Before the adjustments, turn off the POWER switch of the
WRR-802A, and perform the following.
1.
Remove the case cover of the WRR-802A.
2.
Remove the tuner unit from the WRR-802A.
3.
Remove the upper side case lid of the tuner unit, and
insert the tuner unit to the slot of the WRR-802A.
Equipment and Tools
DC power supply:
+
9 Vdc
Signal generator
Connection
Procedure
Step 1:
Preparation
Set the signal generator as follows:
Signal generator setting
FREQUENCY(carrier frequency):
U64 model; 772.000 MHz
U66 model; 784.000 MHz
U68 model; 796.000 MHz
RF OUTPUT (Output level): 35 dB
u
V
EMF
(=
_
78 dBm)
MODULATION (Modulation frequency):
OFF (No modulation)
Step 2:
Adjustment
(1) Connect the signal generator to the ANTENNA A IN
connector.
(2) Turn OFF the WRR-802A POWER switch.
(3) Set the RF OUTPUT (output level) of the signal
generator to the OFF.
(4) While pressing the S708 switch on the RF-92 board
(tuner unit), turn on the WRR-802A POWER switch.
(5) Indication on LCD appears as follows:
LCD:
(6) Set the RF OUTPUT (output level) of the signal
generator to the ON.
DC power supply
+
9 Vdc
Signal genarator
WRR-802A
DC IN 9 V
ANTENNA
A IN
ANTENNA
B IN
RF-92 board
(Tuner unit)
S708
-SOL-
A C1 L
(A C1 L)
(-SQL- )
A
