– 28 –
2.
Confirmation of distortion factor
Setting:
Precedure:
• Measure the distortion factor with an audio analyzer to confirm
that it is below 2 %.
3.
Confirmation of RX gain
Setting:
Precedure:
• Measure the distortion factor with an audio analyzer to confirm
that it is below –10 dB.
4.
Adjustment of RSSI (H) gain
Setting:
Precedure:
• Observing RSSI signal with an oscilloscope, adjust RV101 so
that the duty became 50 %.
5.
Adjustment of RSSI (L) gain
Setting:
Precedure:
• Press
[SET/REC]
key to set the RSSI gain of the base unit to
“Low”.
• Observe the RSSI signal with an oscilloscope to confirm that the
RSSI gain is “Low”.
• Change RF output of the SG to 25 dBµV EMF, then observe the
RSSI signal with an oscilloscope to confirm that the RSSI gain is
“High”.
SG
TP1 (ANT)
TP3 (RF GND)
Frequency : 48.760 MHz
RF output
: 60 dB
µ
V EMF
Signal
: 1 kHz INT
Deviation
: FM 3 kHz DEV
SG
TP1 (ANT)
TP3 (RF GND)
Frequency : 48.760 MHz
RF output
: 6 dB
µ
V EMF
Signal
: 1 kHz INT
Deviation
: FM 3 kHz DEV
AF oscillator
TP1 (ANT)
TP3 (RF GND)
20 Hz
SG
Frequency : 48.760 MHz
RF output : 12 dB
µ
V EMF
Signal
: 20 Hz EXT
Deviation
: AM50% MOD
+
–
TP8 (RSSI)
TP14 (GND)
oscilloscope
TP1 (ANT)
TP3 (RF GND)
Frequency : 48.760 MHz
RF output
: 46 dB
µ
V EMF
Signal
: 1 kHz INT
Deviation
: FM 3 kHz DEV
SG
+
–
TP8 (RSSI)
TP14 (GND)
oscilloscope
Audio analyzer
MEAS. mode : Distortion
Input range
: – 10 dBV, 3%
Filter
: 400 Hz>, <20 kHz
+
–
TP201
TP202
2
µ
F
600
Ω
2
µ
F
25V
2H
2H
Audio analyzer
MEAS. mode : Distortion
Input range
: – 10 dBV, 30%
Filter
: 400 Hz>, <20 kHz
+
–
TP201
TP202
2
µ
F
600
Ω
2
µ
F
25V
2H
2H
Summary of Contents for SPP-A400 - Cordless Telephone With Answering Machine
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