Sony UWP-V1 Service Manual page 39

5. Maximum Frequency Deviation
Adjustment
Equipment and Tools
. DC power supply
DC output voltage : +3.0 ± 0.1Vdc
. DC ammeter
. Audio analyzer
. Modulation analyzer
MEASUREMENT
MEASUREMENT RANGE : AUTO or ± 100 kHz
HPF
LPF
DE EMPHASIS
. Oscilloscope
. Adjustor (SONY part No. 7-721-052-81)
. MM-SMA conversion connector
(SONY Part No. J-6402-490-A)
. SMA-BNC conversion connector
(SONY Part No. J-6402-480-A)
Switch and Control Setting
MB-1137 board
Transmission channel
U30 model ; 32-01 channel (578.125 MHz)
U42 model ; 42-01 channel (650.125 MHz)
CE62 model ; Group 00, 63-32 channel (810.000 MHz)
CE67 model ; Group 00, 68-32 channel (850.000 MHz)
KR model ; 60-01 channel (746.125 MHz)
Attenuation setting :
Accumulated time setting : "00 : 00"
n
Note down the setting position before the adjustment.
After the Adjustment complete, set the original position.
Connections
. Same as "4. Reference Frequency Division adjustments".
. For connecting the DC power supply, refer to step
"3. Connecting the DC power supply" in Section 2-2-2.
Procedure
1. Input 1 kHz, _20 dBV (_17.8 dBm) signal to the MIC IN-
PUT connector (with Mic input cable). (0 dBV = 1 Vrms)
2. Adjust 1RV1 so that the frequency deviation for the
modulation analyzer reading meets the following speci-
fication.
Specification : Frequency deviation = ± 34.5 kHz ± 0.5 kHz
Adjustment : 1RV1/MB-1137 board (A side)
3. Input 1 kHz, _10 dBV (_7.8 dBm) signal to the MIC IN-
PUT connector (with Mic input cable). (0 dBV = 1 Vrms)
UWP Series
: FM
: 50 Hz
: 15 kHz or 20 kHz
: 50 usec
0 dB
4. Connect a modulation analyzer to the antenna terminal
(CN101) via the MM-SMA conversion connector and
the SMA-BNC conversion connector.
5. Adjust 1RV2 so that the frequency deviation for the mod-
ulation analyzer reading meets the following specification.
Specification : Frequency deviation = ±39.5 kHz ±0.5 kHz
Adjustment : 1RV2/MB-1137 board (A side)
6. Distortion Ratio Check
Equipment and Tools
. DC power supply
DC output voltage : +3.0 ± 0.1Vdc
. DC ammeter
. Audio analyzer
. Modulation analyzer
MEASUREMENT
MEASUREMENT RANGE : AUTO or ± 40 kHz
HPF
LPF
DE EMPHASIS
. Oscilloscope
. MM-SMA conversion connector
(SONY Part No. J-6402-490-A)
. SMA-BNC conversion connector
(SONY Part No. J-6402-480-A)
Switch and Control Setting
MB-1137 board
Transmission channel
U30 model ; 32-01 channel (578.125 MHz)
U42 model ; 42-01 channel (650.125 MHz)
CE62 model ; Group 00, 63-32 channel (810.000 MHz)
CE67 model ; Group 00, 68-32 channel (850.000 MHz)
KR model ; 60-01 channel (746.125 MHz)
Attenuation setting :
Accumulated time setting : "00 : 00"
n
Take note of the settings before starting the confirmation
work.
After confirmation is completed, return the settings to
the original setting before change.
: FM
: 50 Hz
: 15 kHz or 20 kHz
: 50 usec
0 dB
2-19