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ADJUSTMENT
u
1-1.
Tx/Rx VCO (See FIG-1, TABLE-1)
Test Equipment
RF Electrical Voltmeter
Dummy Load
DC Power Supply (DC 3.8V)
Linear Detector
Frequency Counter
Unit Condition
a)
Disconnect Ni-Cd battery feed 3.8V from power supply terminal.
b)
Connect power supply that keep on pressing"1"
and '(9 keys.
c)
Push "O followed by "*" key to set unit to channel 10.
d)
Connect digital voltmeter to 14pin (IC151 ) for Tx, and 3pin (IC151 ) for Rx.
e)
Align T253 (Tx) andT152
(Rx) to obtain 1.8V f 0.1 V DC from read of digital voltmeter respectively.
Adjustment
Unit
IC101
@pin Tx VCO
'x
ANT @ (H)
L
3 pin Rx VCO
o
Digital
Rx
Voltmeter
ANT @ (E)
GND
,
(FIG-1)
STEP
CONDITION
ADJUST
ADJUSTED VALUE
SPECIFICATION
1. Tx VCO
Tx VCO side
T253
1.8V
1.8 V+O.l
V
2. Rx VCO
Rx VCO side
T152
1.8V
1.8V*0.1
V
(TABLE-1)
1-2.
TRANSMITTING
(See FIG-2, TABLE-2,
FIG-3, TABLE-3)
Test Equipment
RF Electronic Voltmeter
Frequency Counter
Linear Detector
AF Oscillator
Dummy Load (50s2)
Unit Condition
a)
From the mode mentioned
in 1-1, change toTEST CH '4' by pushing"4
+
'x" key.
b)
Disconnect frequency counter, and connect RF electronic voltmeter to ANT 1 and 2 pin. (50Q probe)
c)
Tx POWER
d)
Tx FREQUENCY
"
e)
Tx MODULATION
Align T251 to obtain 8.0A 3.0 dBm from read of RF voltmeter.
Connect frequency counter to ANT 1 and 2 pin.
Align CT151 to obtain 39.925 MHz f 0.5kHz from the read of frequency counter.
Connect Linear detector to ANT 1 and 2 pin.
Connect AF oscillator (1 kHz, 10mV) to TEL line.
Align VR651 to obtain 1.5kHz *O. 1 kHz dev. from the read of linear detector.
*
And confirm at the AF oscillator to MIC input.
300 Hz, 10mV the read of linear detector 1.4kHz & 0.3kHz dev.
3kHz, 10mV the read of linear detector 2.35kHz * 0.5kHz dev
f)
Tx DATA MODULATION
. After Tx modulation
alignment,
Push "TALK key. (Tx DATA is sent)
+ 0.8kHz dev,
c Check the read of linear detector is 4.OkHz _, .okHz
-9-
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