Alignment Of Pll And Carrier Oscillator; Test Equipment Required; Pll And Carrier Oscillator Test Equipment Setup - Realistic TRC-449 Service Manual

ALIGNMENT OF PLL AND CARRIER OSCILLATOR
1. Test equipment required:
a. Oscilloscope (DC - 50 MHz)
b. Frequency counter (0 - 30 MHz)
c. DC Power Supply (13.8V 100 mA)
d. DC Voltmeter (1 OV Maximum 100Kohm/V)
e. 50 ohm Load
2. Alignment procedure: (See page 8)
Connect Test Equipment as shown below.
STEP PRESET TO
CONNECTIONS ADJUSTMENT REMARKS
1
RX, AM, CH19
TP6 L24 Adjust for max. output.
Clarifier: in center position
2
RX, AM, CH 1
TP7 L17
Adjust for 2 V reading on Voltmeter.
Clarifier: in center position
3 Same as Step 1 TP8 L16 Adjust for max. output.
4 Same as Step 1 TP8 CT6
Adjust to obtain 34.985 MHz ±20 Hz
on frequency Counter.
5
RX, USB, CH19
TP8
CT4
Adjust to obtain 34.9875 MHz ±20 Hz
Clarifier, in center position on frequency Counter.
6
RX, LSB, CH19
TP8 CT5
Adjust to obtain 34.9825 MHz ±20 Hz
Clarifier: in center position
on frequency Counter.
7 TX, LSB, CH19
TP8
VR9
Adjust to obtain 34.9825 MHz ±20 Hz
on frequency Counter.
S Same as Step 7 TP9 CT3
Adjust to obtain 7.7975 MHz ±5 Hz
on frequency Counter.
9 TX,USB,CH19 TP9 CT2
Adjust to obtain 7.8025 MHz ±5 Hz
on frequency Counter .
PLL AND CARRIER OSCILLATOR TEST EQUIPMENT SETUP
EJE]
DC Power Supply
13.8V
-9-
Frequency Counter
o
Oscilloscope
DC Voltmeter