Kenwood TKR-740 Service Manual page 35

4.4 Receiver main PLL circuit
The receiver main PLL circuit consists of VCO (Q8, Q9)
and a single-chip PLL IC IC1, buffer amplifier Q14, RF amplifier
Q3, Q1, Q5, and Q6. The first local oscillator is an upper
heterodyne local oscillator, and the VCO oscillator frequency
is 202.850 to 218.850 M Hz. In addition, the tw o VCOs cover
CIRCUIT DESCRIPTION
tw o bands: the Q8 VCO covers the low er band and the Q9
VCO covers the upper band. PLL IC1 compares the 4.5M Hz
signal from the receiver DDS circuit and the VCO signal w ith
the 100kHz comparison frequency.
Fig.17 Receiver main PLL circuit
TKR-740
35