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5-2.
HANDSET SECTION
• Make the set in Test mode (see page 21)
1. Checking RX I&Q Output Level
Setting:
Procedure:
1. Place the bandset in the Continuous Receive mode (CH1, LNA
AGC ON).
2. Set the SSG frequency to the frequency on CH1 + 300 kHz, and
the RF output level to - 95 dBm.
3. Measure the output level of RXIN, RXIP, RXQN, and RXQP
with a level meter. At this time, confirm with an oscilloscope
that a sine wave of 300 kHz is output.
4. Confirm that the measured output level is -25.0 to -20.0 dB V.
IF IC401 was replaced (there is no ID data), the output level is
-29 dB V or less.
5. Also, execute steps 1 through 4 for the channels 10 and 20.
* For the frequency on each channel, see page 18.
2. Checking TX Center Frequency
Setting:
• short: TP820
˜
TP814 (GND)
+
level meter
oscilloscope
–
+
–
TP804: RXIP
TP803: RXIN
TP802: RXQP
TP801: RXQN
TP814: GND
SSG
ANTENNA TERMINAL
+
frequency counter
ANTENNA TERMINAL
–
+
peak power meter
–
ANTENNA TERMINAL (TP812)
Procedure:
1. Short TP820 (TX DATA) and TP814 (GND) on the HAND
MAIN board in the handset.
2. Place the handset in the Continuous Transmit more (CH1, High
power).
3. Measure the ANT OUT frequency of the RF module in the hand
set using a frequency counter.
4. Coufirm that the measured frequency is 904.200 MHz ± 27kHz.
5. Also, execute steps 1 through 4 for the channels 10 and 20.
3. Checking TX Output
Setting:
Procedure:
1. Place the handset in the Continuous Transmit more (CH1, High
power).
2. Measure the ANT OUT output of the RF module in the handset
using a peak power meter.
3. Confirm that the measured output is 50 mW (MIN 20 mW).
4. Also, execute steps 1 through 3 for the channels 10 and 20.
CH10: 50 mW (MIN 18 mW)
CH20: 45 mW (MIN 15 mW)
