Sony UWP-V1 Service Manual page 86

10. Spurious Emissions Check
Equipment and Tools
. DC power supply
DC output voltage : +3.0 ± 0.1Vdc
. DC ammeter
. Spectrum analyzer
. 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-1094 board
Transmission channel
U30 model ; 32-01 channel (578.125 MHz)
U42 model ; 44-01 channel (650.125 MHz)
U6264 model ; 64-01 channel (770.125 MHz)
U6668 model ; 68-01 channel (794.125 MHz)
CE62 model ; Group 00, 63-32 channel (810.000 MHz)
CE67 model ; Group 00, 68-32 channel (850.000 MHz)
Attenuation setting
Accumulated time setting
MIC/LINE Select Switch (S1) : MIC
n
Take note of the settings before starting the confirmation
work.
After confirmation is completed, return the settings to
the original setting before change.
Connections
. For connecting the DC power supply, refer to step
"3. Connecting the DC power supply" in Section 2-1-2.
. For connecting the MIC input connector (CN1), refer to
"4.Reference Frequency Deviation Adjustment".
Spectrum analyzer
SMA-BNC conversion connector
MM-SMA conversion connector
CN101
MB-1094 board (A side)
2-66
: 0 dB
: "00 : 00"
Input termination
(shorted between GND and HOT)
CN1
MB-1094 board (B side)
Procedure
1. Set the spectrum analyzer as below;
CENTER FREQUENCY
REFERENCE LEVEL
FREQUENCY SPAN
RBW (resolution band width) : 300 kHz
ATT
2. Check that the spurious emissions level (up to 3 GHz)
reading for the spectrum analyzer remains below
_40 dBm.
Carrier frequency
: 1.5 GHz
: 20 dBm
: 3 GHz or Full span
(300 MHz/DIV)
: 20 dB
20 dBm
_40 dBm
v:10 dB/div
H:20 MHz/div
3 GHz
1.5 GHz (fc)
UWP Series