Kenwood TM-731A Service Manual page 10

TM-731A/E
CIRCUIT DESCRIPTION
© 8R (Receive 8 V) Stop Circuit
Fvco1 : Output frequency of 144 MHz-band VCO
Fosc «° Reference oscillator frequency, 12.8 MHz
R = 2560 for 5kHz, 10 kHz, 20 kHz, and
25 kHz steps
R = 2048 for 12.5 kHz steps
ff n1=208,
A1=36,
then with 5 kHz, 10 kHz, 20 kHz, or
25 kHz steps:
Fvcoi = {(208 x 128) + 36} x 12800 + 2560
= (26624 + 36)x5
= 133300 = 133.3 MHz
"8c
al2
. . BR
Shift register, x
1C4 pin 11 2 > av
2 ¥ (OV)
wo Ko
= co ag
™ << ov
(8Vv)
Bc
C96 1 I6V
Fig. 14 8R Stop Circuit