PLL frequency synthesizer oscillation circuit with IC MC145163

This IC number MC145163 is IC for the PLL frequency synthesizer which can specify the dividing ratio of the comparison frequency by BCD(Binary Coded Decimal).

PLL synthesizing oscillator with IC MC145163 Circuit

Reference frequency
The circuit this time makes an oscillation frequency 10.24MHz.
Dividing ratio of the reference frequency
To change the frequency of the output by the dividing ratio of the comparison frequency in the 10KHz unit, the dividing ratio is fixing on 1024 at the circuit this time.

Dividing ratio of the comparison frequency
Because the 144-MHz bandwidth of the amateur radio is 2MHz(144.0MHz to 146.0MHz) in Japan, it makes the output frequency of the PLL 133.3MHz to 135.3MHz. (Frequency with the low of 10.7MHz)
The comparison frequency which is inputted to MC145163 is mixed with 119.3MHz by SN16913 and becomes 14MHz to 16MHz.
Because the phase comparison frequency is 10KHz, the dividing range of the comparative divider becomes 1400 to 1600.
The BCD specification value of 103 is fixed on 1 and the BCD specification value of 102 is made to be able to choose 4 or 5.

The BCD specification value of 102 becomes 0100 or 0101 when it is displayed by bits. The bit of 20 is made to be able to be changed into 0 or 1.101 and 100 specify 0 to 9 by the binary-coded decimal code.
The frequency of 200 channels can be specified by the 10KHz unit by above dividing ratio specification.