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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 dBuV
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
of signal generator
100 Hz
15 kHz
(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).
3-10
EMF
(= _53 dBm)
TUNER OUTPUT connector
output level
_0.7 ± 1.0 dB
_28.5 ± 2.5 dB
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 BuV
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.
EMF
(= _53 dBm)
WRR-802A (U)
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