Sony WRT-807B, Service Manual

Page: 28 / 64

3-12
WRT-807B (U/CE)
3-2-11. Spurious Emissions Check
Equipment and Tools
DC power supply
DC output voltage : + 1.5
±
0.1 Vdc
DC ammeter
Spectrum analyzer
SMA-BNC (J) connector (Part No. J-6402-490-A)
RF conversion connector (Part No. J-6402-400-A)
Connections
(For connecting the DC power supply, refer to the
“Preparation” on page 3-2.)
Switch and Control Setting
Same as “Switch and Control Initial Setting” on page 3-3.
Procedure
(1) Connect the spectrum analyzer to the antenna connector
(CN305) with SMA-BNC (J) connector (and RF con-
version connector).
(2) Set the spectrum analyzer as follows;
CENTER FREQUENCY : 2.5 GHz
REFERENCE LEVEL : 10 dBm
FREQUENCY SPAN : 5 GHz (500 MHz/DIV)
or Full span
RBW : 300 kHz
(resolution band width)
ATT
: 20 dB
(3) Check that the spurious emissions level (up to 4 GHz)
reading for the spectrum analyzer remains below _ 40
dBm.
Spectrum
analyzer
connector
MB-860 board (B side)
CN305
SMA-BNC (J) connector with
RF conversion connector
10 dBm
_ 40 dBm
2.5 GHz (fc)
5 GHz
V : 10 dB/div
H : 500 MHz/div
Carrier frequency