3-10
WRR-801A
WRU-801A
2. S/N Check
Procedure
Step 1:
Tuner
[1]
(Tuner unit 1) checking
(1) Set the WRR-801A as follows;
Front panel (Tuner
[1]
)
Channel setting: Group 00, 6901 channel
(800.125 MHz)
Muting:
OFF
Rear panel
ATT (ANTENNA A, B IN) switch: 0 dB
(2) Connect the audio analyzer to the TUNER OUTPUT 1
connector via MIC amp.
(3) Connect the signal generator to the ANTENNA A IN
connector with DC cut fixture.
(4) 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
(5) Read the output level of the TUNER OUTPUT 1
connector (Audio analyzer indication level). This level
is specified to be 0 dB.
(6) Turn OFF the MODULATION (modulation
frequency) of the signal generator (No modulation).
(7) Check that output level of the TUNER OUTPUT 1 is
_
62 dB or less (S/N is 62 dB or more with A-weighted
filter) as compared with the level of procedure (4)
above.
(8) Change the RF OUTPUT (output level) of the signal
generator as shown below.
RF OUTPUT (output level): 20 dB
u
V
EMF
(=
_
93 dBm)
(9) Check that output level of the TUNER OUTPUT 1 is
_
40 dB or less (S/N is 40 dB or more with A-weighted
filter) as compared with the level of procedure (5)
above.
(10)Change the RF OUTPUT (output level) of the signal
generator as shown below.
RF OUTPUT (output level): 60 dB
u
V
EMF
(=
_
53 dBm)
(11)Set the audio analyzer to the distortion mode.
(12)Check that distortion ratio is
_
43 dB or less (0.7 % or
less).
(13)Connect the signal generator to the ANTENNA B IN
connector with DC cut fixture.
(14)Perform the procedures (4) through (12) above.
(15)Set the channel and FREQUENCY (carrier frequency)
of the signal generator as shown
1
and
2
below.
Perform the procedures (1) to (14) above, for each
channel setting (
1
and
2
).
1
Channel setting (Tuner
[1]
):
Group 00, 6801 channel
(794.125 MHz)
Signal generator setting:
FREQUENCY (Carrier frequency); 794.125 MHz
2
Channel setting (Tuner
[1]
):
Group 00, 6947 channel
(805.875 MHz)
Signal generator setting:
FREQUENCY (Carrier frequency); 805.875 MHz
Step 2:
Tuner
[2]
to
[6]
checking
When the TUNER UNIT WRU-801A is installed in the
Tuner
[2]
(Tuner unit 2) to Tuner
[6]
(Tuner unit 6) of the
WRR-801A, perform the adjustments from procedures (1)
to (15) of “Step 1. Tuner
[1]
(Tuner unit 1) checking” on
the respective tuner units that are installed in the WRR-
801A.
When performing the above described checking change the
following details as shown below, of the “Step 1. Tuner
[1]
(Tuner unit 1) checking”.
Tuner
[1]
→
Tuner
[2]
,
[3]
,
[4]
,
[5]
, and
[6]
TUNER OUTPUT 1
→
TUNER OUTPUT 2, 3, 4, 5, and 6
