
3-5
WRR-801A
WRU-801A
2. Output level adjustment
Perform this adjustment when the TUNER OUTPUT
levels deviate from the specification.
Preparation
Before the adjustments, turn off the POWER switch of the
WRR-801A, and perform the followings.
1.
Remove the case cover of the WRR-801A.
2.
Remove the tuner unit form the WRR-801A.
3.
Remove the upper side case lid of the tuner unit, and
insert the tuner unit to the slot of the WRR-801A.
Equipment and Tools
.
Audio analyzer (level meter, distortion meter)
.
Mic amp (Noise meter)
.
Oscilloscope
.
Adjuster (0.4
x
1.3 mm): (Part No. 7-221-652-81)
.
DC cut fixture (See the “How to make DC cut fixture”
on page 3-1.)
Connection/Adjustment Location
Switch and Control Setting
Front panel (Tuner
[1]
)
Channel setting: Group 00, 6901 channel
(800.125 MHz)
Muting:
OFF
Rear panel
ATT (ANTENNA A, B) switch: 0 dB
Procedure
Step 1:
Preparation
Set the signal generator as follows:
Signal generator setting
FREQUENCY (Carrier frequency): 800.125 MHz
RF OUTPUT (Output level): 60 dB
u
V
EMF
(=
_
53 dBm)
MODULATION (Modulation frequency): 1 kHz
DEVIATION (Frequency deviation):
±
5 kHz
Step 2:
Tuner
[1]
(Tuner unit 1) adjustment
(1) Connect the audio analyzer to the TUNER OUTPUT 1
connector via MIC amp.
(2) Connect the signal generator to the ANTENNA A IN
connector with DC cut fixture.
(3) Adjustment (ANTENNA A IN side adjustment)
Specification: Output level (level meter indication
level) =
_
20 dBm
±
0.5 dB (at 600
Z
loaded)
Adjustment:
1
RV202/RF board (Tuner unit 1)
(4) Connect the signal generator to the ANTENNA B IN
connector with DC cut fixture.
(5) Adjustment (ANTENNA B IN side adjustment)
Specification: Output level (level meter indication
level) =
_
20 dBm
±
0.5 dB (at 600
Z
loaded)
Adjustment:
1
RV201/RF board (Tuner unit 1)
n
The output level difference between the ANTENNA
A side and the ANTENNA B side should be within
0.3 dB.
1
6
2
3
4
5
Signal
generator
MIC amp
Audio
analyzer
DC cut fixture
ANTENNA A IN
Tuner
Oscilloscope
DC cut fixture
ANTENNA B IN
WRR-801A
WRU-801A
600
Z
balance
input
RV202
RV201
Tuner unit (WRU-801A)
TUNER
OUTPUT 1
Содержание WRR-801A
Страница 1: ...UHF SYNTHESIZED DIVERSITY TUNER WRR 801A SERVICE MANUAL UHF SYNTHESIZED TUNER UNIT WRU 801A U Model ...
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Страница 53: ...SECTION 7 SCHEMATIC DIAGRAMS AND BOARD LAYOUTS 7 1 7 1 WRR 801 801A WRU 801 801A ...
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