3-10
WRR-802A (U)
3. Frequency characteristic check
Procedure
(1) Set the WRR-802A as follows;
Channel setting:
U64 model; Group 00, 6501 channel (776.125 MHz)
U66 model; Group 00, 6701 channel (788.125 MHz)
U68 model; Group 00, 6901 channel (800.125 MHz)
VOL. control: MAX
Muting: OFF
TUNER OUTPUT LEVEL switch: LINE (
_
20 dBm)
(2) Connect the audio analyzer to the TUNER OUTPUT
(XLR type) connector via MIC amp (Amplification
gain 0 dB).
(3) Connect the signal generator to the ANTENNA A IN
connector.
(4) Set the signal generator as follows:
Signal generator setting
FREQUENCY(carrier frequency)
U64 model; 776.125 MHz
U66 model; 788.125 MHz
U68 model; 800.125 MHz
RF OUTPUT (Output level): 60 dB
u
V
EMF
(=
_
53 dBm)
MODULATION (Modulation frequency): 1 kHz
DEVIATION (Frequency deviation):
±
12 kHz
(5) Read the output level of the TUNER OUTPUT (XLR
type) connector (indication of the audio analyzer). This
level is specified to be 0 dB.
(6) Change the MODULATION (modulation frequency)
of the signal generator as follows, and check the output
level with respect to the output level under the proce-
dure (5) is set also as follows.
n
100 Hz and 15 kHz modulation frequency must be set
by using the function generator.
MODULATION frequency
TUNER OUTPUT connector
of signal generator
output level
100 Hz
_
0.7
±
1.0 dB
15 kHz
_
28.5
±
2.5 dB
(7) Connect the audio analyzer to the TUNER OUTPUT
(TRS type) connector via the MIC amp (Amplification
gain 0 dB).
(8) Perform the procedures (5) and (6).
(9) Connect the signal generator to the ANTENNA B IN
connector, and perform the procedures (4) through (8).
4. Distortion ratio check
Procedure
(1) Set the WRR-802A as follows;
Channel setting:
U64 model; Group 00, 6501 channel (776.125 MHz)
U66 model; Group 00, 6701 channel (788.125 MHz)
U68 model; Group 00, 6901 channel (800.125 MHz)
VOL. control: MAX
Muting: OFF
TUNER OUTPUT LEVEL switch: LINE (
_
20 dBm)
(2) Connect the audio analyzer to the TUNER OUTPUT
(XLR type) connector via MIC amp (Amplification
gain 0 dB).
(3) Connect the signal generator to the ANTENNA A IN
connector.
(4) Set the signal generator as follows:
Signal generator setting
FREQUENCY(carrier frequency)
U64 model; 776.125 MHz
U66 model; 788.125 MHz
U68 model; 800.125 MHz
RF OUTPUT (Output level): 60d B
u
V
EMF
(=
_
53 dBm)
MODULATION (Modulation frequency): 1 kHz
DEVIATION (Frequency deviation):
±
40 kHz
(5) Set the audio analyzer to the distortion mode, and
check that the distortion ratio is less than 0.7 %.
(6) Change the MODULATION (modulation frequency)
of the signal generator as shown below.
MODULATION (modulation frequency): 10 kHz
(Note: 10 kHz modulation frequency must be set by
using the function generator.)
Check that the distortion ratio is less than 4 %.
(7) Connect the audio analyzer to the TUNER OUTPUT
(TRS type) connector via the MIC amp (Amplification
gain 0 dB).
(8) Perform the procedures (5) and (6).
(9) Connect the signal generator to the ANTENNA B IN
connector, and perform the procedures (5) through (8)
above.
