– 20 –
6-2.
HANDSET SECTION
• Make the set in Test mode (see page 16)
1. Checking RX I&Q Output Level
Setting:
Procedure:
1. Place the handset 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 –26.0 to 19.0 (TYPI-
CAL –22.0) dBV. If IC502 was replaced (there is no ID data),
the output level is –31.0 to –24.0 dBV.
5. Also, execute steps 1 through 4 for the channels 10 and 20.
* For the frequency on each channel, see page 12.
2. Checking TX Center Frequency
Setting:
• short: TP555
↔
TP553
Procedure:
1. Short TP555 and TP553 (GND) on the HAND MAIN board in
2. Place the handset in the Continuous Transmit mode (CH1, High
3. Measure the ANT OUT frequency of the RF module in the hand-
set using a frequency counter.
4. Confirm that the measured frequency is 903.600 MHz ±
+
level meter
oscilloscope
–
+
–
TP520: RXIP
TP521: RXIN
TP522: RXQP
TP523: RXQN
TP553: GND
SSG
ANTENNA TERMINAL
frequency counter
3. Checking TX output
Setting:
Procedure:
1. Place the handset in the Continuous Transmit mode (CH1, High
power).
2. Measure the ANT OUT output of the RF module in the hand-
set using a peak power meter.
3. Confirm that the measured output is 80 mW (MIN 20 mW).
4. Also, execute steps 1 through 3 for the channels 10 and 20.
CH10: 80 mW (MIN 20 mW)
CH20: 50 mW (MIN 10 mW)
+
peak power meter
–
ANTENNA TERMINAL
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