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2. S/N 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): ± 5 kHz
(5) Read the output level of the TUNER OUTPUT (XLR
type) connector (Audio analyzer indication level). This
level is specified to be 0 dB.
(6) Turn OFF the MODULATION of the signal generator
(No modulation).
(7) Check that output level of the TUNER OUTPUT
(XLR type) is _62 dB or less (S/N is 62 dB or more
with A-weighted filter) as compared with the level of
procedure (5) above.
(8) Change the RF OUTPUT (output level) of the signal
generator as shown below.
RF OUTPUT (output level): 20 dBuV
(9) Check that output level of the TUNER OUTPUT
(XLR type) is _50 dB or less (S/N is 50 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 dBuV
(11)Set the audio analyzer to the distortion mode.
(12)Check that distortion ratio is _45 dB or less (0.56 % or
less).
WRR-802A (U)
EMF
(= _53 dBm)
EMF
(= _93 dBm)
EMF
(= _53 dBm)
(13)Connect the audio analyzer to the TUNER OUTPUT
(TRS type) connector via the MIC amp (Amplification
gain 0 dB).
(14)Perform the procedures (5) through (12).
(15)Connect the signal generator to the ANTENNA B IN
connector.
(16)Perform the procedures (4) through (14) above.
(17)Set the channel and FREQUENCY (carrier frequency)
of the signal generator as shown 1 and 2 below.
Perform the procedures (1) to (16) above, for each
channel setting (1 and 2).
1 Channel setting:
U64 model: Group 00, 6401 channel (770.125 MHz)
U66 model: Group 00, 6601 channel (782.125 MHz)
U68 model: Group 00, 6801 channel (794.125 MHz)
Signal generator setting:
FREQUENCY(Carrier frequency)
U64 model : 770.125 MHz
U66 model : 782.125 MHz
U68 model : 794.125 MHz
2 Channel setting:
U64 model : Group 00, 6547 channel (781.875 MHz)
U66 model : Group 00, 6747 channel (793.875 MHz)
U68 model : Group 00, 6947 channel (805.875 MHz)
Signal generator setting:
FREQUENCY (Carrier frequency)
U64 model: 781.875 MHz
U66 model: 793.875 MHz
U68 model: 805.875 MHz
3-9
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