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RECEIVER
Test Equipment Required and Connections
• SG: RF Signal Generator, 49.830 MHz, 49.160 MHz
• Digital Voltmeter
• SINAD Meter
SG
MOD = 1KHz
DEV = ±3kHz
AC Adapter
(120V 60HZ)
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 about 2 seconds later, then the TX Mode is entered (CH21).
d) Press the Page key 4 times, then the RX Mode is entered (CH21).
Alignment Procedure
Step
Preset to
SG: 1 mV
1
No modulation
SG: 1 mV
1 kHz ±3kHz
2
deviation
SG: 1 mV
1 kHz ±3 kHz
3
deviation
SG: 1 mV
1 kHz ±3 kHz
4
deviation
Alignment Point Location on Main (Base Unit) PCB
Base Unit
Dummy Load
RF Test
TEL Jack
-
Point
+
Adjustment
Connect the SG to the RF test point.
Connect the digital voltmeter to the test point of the RX VCO.
L7
Adjust L7 to indicate DC 1.4 ±0.05 V.
Connect the digital voltmeter to the test point of Discriminator.
L3
Adjust L3 to indicate DC 2.0 ±0.05V.
Adjust RT1 to make AF SSVM value −5 dBm ±0.5 dB.
RT1
Set T/P SW to TONE Mode. Press the Page key once, then CH
changes to CH 8.
Connect the AF SSVM to the TEL LINE across a 600-ohm dummy
L6
load.
Keep the SINAD reading at 12 dB by adjusting the SG output. Adjust
L6 for maximum SINAD reading.
• Dummy Load, 600-ohm
• AF SSVM
AF SSVM
(600-ohm)
SINAD
Meter
Remarks
RF Test Point
L1
L7 L6
RT1
L3
— 4 —
Digital Voltmeter
RX VCO
Test Point
RX VCO
Test Point
P
S1
T/P SW
T
J2
DC IN 9V Jack
Discriminator
Test Point
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