Sony WRR-800A Service Manual page 24

1. Output level check
Procedure
(1) Set the WRR-800A as follows;
Channel setting: Group 00, 6701 channel
(799.250 MHz)
VOL. control: MAX
Muting: OFF
(2) Connect the audio analyzer to the TUNER OUTPUT
connector via MIC amp.
(3) Connect the signal generator to the ANTENNA A IN
connector.
(4) Set the signal generator as follows:
Signal generator setting
FREQUENCY (Carrier frequency): 799.250 MHz
RF OUTPUT (Output level): 60 dBuV
MODULATION (Modulation frequency): 1 kHz
DEVIATION (Frequency deviation): ± 5 kHz
(5) Check that the TUNER OUTPUT connector output
level is _20 dBm ± 2 dB (at 600 Z loaded).
(6) Connect the signal generator to the ANTENNA B IN
connector.
(7) Check that the TUNER OUTPUT connector output
level is _20 dBm ± 2 dB (at 600 Z loaded).
2. S/N Check
Procedure
(1) Set the WRR-800A as follows;
Channel setting: Group 00, 6701 channel
(799.250 MHz)
VOL. control: MAX
Muting: OFF
(2) Connect the audio analyzer to the TUNER OUTPUT
connector via MIC amp.
(3) Connect the signal generator to the ANTENNA A IN
connector.
(4) Set the signal generator as follows:
Signal generator setting
FREQUENCY (Carrier frequency): 799.250 MHz
RF OUTPUT (Output level): 60 dBuV
MODULATION (Modulation frequency): 1 kHz
DEVIATION (Frequency deviation): ± 5 kHz
3-8
EMF
(= _53 dBm)
EMF
(= _53 dBm)
(5) Read the output level of the TUNER OUTPUT
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 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 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 dBuV
(11)Set the audio analyzer to the distortion mode.
(12)Check that distortion ratio is _43 dB or less (0.7 % or
less) with A-weighted.
(13)Connect the signal generator to the ANTENNA B IN
connector.
(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:
Signal generator setting:
FREQUENCY (carrier frequency); 792.250 MHz
2 Channel setting:
Signal generator setting:
FREQUENCY (carrier frequency); 805.500 MHz
EMF
(= _93 dBm)
EMF
(= _53 dBm)
Group 00, 6601 channel
(792.250 MHz)
Group 00, 6751 channel
(805.500 MHz)
WRR-800A