Vco Output Frequency, Ic-2 Input Frequency And Code Table - Realistic trc-448 Service Manual

Page 7
PLL CIRCUIT BLOCK DIAGRAM
AM and USB
Q5 VCO frequency 34.765 - 35.2075 should be 34.815 -35.025 MHz.
IC-1 MIXER output frequency 1.28 - 1.72 should be 1.33 - 1.54 MHz.
LSB
Q4 VCO frequency 19.1625 - 19.6025 should be 19.2125 - 19.4225 MHz.
Q3 MIXER output frequency 34.7675 - 35.2075 should be 34.8175 - 35.0275 MHz.
IC-1 MIXER output frequency 1.28 - 1.72 MHz should be 1.33 - 1.54 MHz.
Page 11
PLL SECTION ALIGNMENT CHART
Control Setting: CH-19 should be CH-9.
Step 7
Adjust T3-3 for 2.7V DC ± 0.1V.
Step 8 Adjust T3, T4 34.9175 MHz.
Step 9
Adjust TC-2 for 2.7 V DC.
Step 10 Adjust T6 for max. output at 34.915 MHz.
Step 11 Adjust T5 for max. output at 19.3125 MHz.
NOTE 2 should read as follow; Step 7 and 9, DC output should change from 2.7±0.1
volts on CH-1 to approx. 3.2 volts on CH-18.
Page 12
VCO OUTPUT FREQUENCY, IC-2 INPUT FREQUENCY AND CODE TABLE
Refer to the following table.
CH
FREQUENCY
(MHz)
VCO (MHz)
fin
(MHz)
N
9 10
INPUT CODE PIN No.
11 12 13 14 15 16
RX (AM)
TX (LSB)
RX (LSB)
I
TX (AM
USB)
RX (USB)
1 27.015
34.815 19.2125 34.8175 I 1.33 133 1 0 0 0 0 1 0 1
2 27.025 34.825 19.2225
34.8275 1.34 134 1 0
0
0 0 1 1 0
3
27.035 34.835
I 19.2325 34.8375 1.35
135 1 0 0 0
0 1 1 1
4
27.055 34.855
I 19.2525 34.8575 1.37 137 1 0 0 0 1 0 0 1
5 27.065 34.865 19.2625 34.8675 1.38 138 1 0
0 0 1 0 1 0
6
27.085
34.885 19.2825
34.8875 1.40
140 1 0
0 0 1 1 0 0
7 27.095 34.895 19.2925 34.8975 1.41 141 1 0 0 0
1 1 0 1
8 27.105 34.905 19.3025 34.9075 1.42 142 1 0 0 0 1
1 1 0
9
27.115
34.915 19.3125
34.9175
1.43 143
1 0 0 0 1
1 1 1
10
27.125 34.925 19.3225 34.9275 1.44 144 1 0 0 1 0 0 0 0
11 27.135 34.935 19.3325 34.9375 1.45 145 1 0 0 1 0 0
0 1
12 27.155 34.955 19.3525 34.9575 1.47 147 1 0 0 1 0
0 1 1
13 27.165
34.965 19.3625 34.9675 1.48 148 1 0 0 1
0 1 0 0
14 27.175 34.975 19.3725 34.9775 1.49
149 1 0
0 1 0 1 0
1
15 27.185 34.985
19.3825
34.9875
1.50 150 1
0 0 1 0 1 1 0
16 27.195
34.995 19.3925 34.9975 1.51 151 1 0
0 1 0 1 1 1
17
27.205 35.005 19.4025 35.0075 1.52 152 1 0 0 1
1 0 0 0
18 27.225
35.025 19.4225 35.0275 1.54 154 1 0
0 1
1 0 1 0