3-15
WRT-808A (U)
3-2-13. Spurious Emissions Check
Equipment and Tools
DC power supply
DC output Voltage:
+
3.0
±
0.1 V dc
DC ammeter
Spectrum analyzer
MM-SMA (J) connector (Part No. J-6402-480-A)
SMA-BNC (J) connector (Part No. J-6402-490-A)
Connections
(For connecting the DC power supply, refer to the “Preparations”
on page 3-2.)
Switch and Control Setting
The following setting is to be perform with the channel se-
lect switches (S504 and S505).
Transmitting Channel setting:
U64 model:
65-01 channel (776.125 MHz)
U66 model:
67-01 channel (788.125 MHz)
U68 model:
69-01 channel (800.125 MHz)
RF power output switch (S401): 50 mW
Input LEVEL control (RV101): “
_
60” (0 dB attenuation)
Turn the RV101 clockwise
fully.
Spectrum
analyzer
MM-SMA (J) connector
with SMA-BNC (J) connector
CN402
Procedure
(1) Set the spectrum analyzer as follows;
CENTER FREQUENCY:
5.0 GHz
REFERENCE LEVEL:
20 dBm
FREQUENCY SPAN:
10 GHz (1 GHz/DIV)
RBW (resolution band width): 300 kHz
ATT:
30 dB
(2) Check that the spurious emissions level (up to tenth or-
der) reading for the spectrum analyzer remains below
_
40 dBm.
Carrier frequency
RBW: 300 kHz
VBW: 300 kHz
SWP: 230 ms
V: 10 dB/div
H: 1 GHz/div
5 GHz (fc)
10 GHz
_
40 dBm
20 dBm
