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Receiver
Test Equipment Required and Connections
• SG: RF Signal Generator, 49.830MHz
• Digital Voltmeter
• SINAD Meter
MOD=1kHz
DEV=±3kHz
Preset
a) Set T/P SW to Pulse Mode.
b) Turn on AC power while the Page key is being depressed.
c) Release the Page key 2 second later, then the TX Mode is entered (CH21).
d) Press the Page key 4 times, then the DUPLEX Mode is entered (CH21).
Alignment Procedure
Step
Preset to
SG: 1mV
1
No modulation
SG: 1mV
2
No modulation
SG: 1mV
3
1kHz ±3kHz
deviation
SG: 0.2"V
4
No modulation
Alignment Point Location on Main PCB
• Dummy Load, 600-ohm
• AF SSVM
BASE Unit
SG
TEL Jack
RF Test
Point
AC Adapter
(120V 60Hz)
Adjustment
Connect the SG to the RF test point.
L4
Connect the digital voltmeter to the test point of the RX VCO.
Adjust L4 to indicate DC 3.3V ±0.05V.
Set the digital voltmeter at the test point of DISCRI.
L2
Adjust L2 to indicate 2.0V ±0.05V.
Connect the AF SSVM to the TEL LINE through a 600-ohm dummy
RT2
load, then adjust RT2 to indicate AC -6dBm ±0.5dBm.
Press the Page key 2 times. Turn RT1 to fully clockwise and confirm
the STATUS LED turns off.
RT1
Then adjust RT1 to turn to counterclockwise slowly where the STATUS
LED just turns on.
DISCRI Test Point
RT2
RT1
L2
AF SSVM
Dummy Load
(600-ohm)
SINAD
Meter
Remarks
RX VCO Test Point
L4
4
Digital Voltmeter
RF Test Point
S1
T/P SW
P
T
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