Realistic trc-449 Service Manual page 9

5O5 Load
Oscilloscope
0
P.T.T.
Ant.
Mic.
0 Jack
:s
Cse,
_Km/.
_1
Frequency Counter
-41
Probe
TRC-449
Transceiver
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 (10V 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
Clarifier: in center position
TP6 L24
Adjust for max. output.
2
RX, AM, CH 1
Clarifier: in center position
TP7 L17 Adjust for 2 V reading on Voltmeter.
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
Clarifier, in center position
C1-4
Adjust to obtain 34.9875 MHz ±20 Hz
on frequency Counter.
6
RX, LSB, CH19
Clarifier: in center position
TP8
CT5
Adjust to obtain 34.9825 MHz ±20 Hz
on frequency Counter.
7
TX, LSB, CH19 TP8 VR9
Adjust to obtain 34.9825 MHz ±20 Hz
on frequency Counter.
8
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