– 13 –
5-2.
HANDSET SECTION
• Make the set in Test mode (see page 11)
1. Checking RX I&Q Output Level
Setting:
Procedure:
1. Place the handset in the Continuous Receive mode (1CH, LNA,
AGC ON).
2. Set the SSG frequency to the frequency on 1CH + 300 kHz,
and the RF output level to –95 dBm.
3. Measure the output lvel 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 –23.3 to –20.9 dBV.
If IC502 was replaced (there is no ID data), the output level
is –28.3 to –25.9 dBV.
5. Also, execute steps 1 through 4 for the channels 2 – 20.
* for the frequency on each channel, see page 7.
2. Checking TX Center Frequency
Setting:
• short: TP555
↔
TP553
+
level meter
oscilloscope
–
+
–
TP520: RXIP
TP521: RXIN
TP522: RXQP
TP523: RXQP
TP553: GND
SG
ANTENNA TERMINAL
+
frequency counter
ANTENNA TERMINAL
–
Procedure:
1. Short TP555 and TP553 (GND) on the MAIN board in the base
unit.
2. Place the handset in the Continuous Transmit mode (1CH, High
power).
3. Measure the ANT OUT frequency of the RF module in the hand-
set using a frequency counter.
4. Confirm that the measured freuquency is 903.600 MHz ±
27 kHz.
5. Also, execute steps 1 through 4 for the channels 2 – 20.
3. Checking TX output
Setting:
Procedure:
1. Place the handset in the Continuous Transmit mode (1CH, 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 29 mW (MIN 17.4 mW).
4. Also, execute steps 1 through 4 for the channels 2 – 20.
+
peak power meter
–
ANTENNA TERMINAL
