Kenwood TS-440S Serivce Manual page 24

TS-440S
CIRCUIT DESCRIPTION
14 . Mode control signals
Transmit/receive mode signals are generated by ICI 0 in the
to 10, the voltages of control pins 16 and 17 change . Dur-
IF unit . IC 10 is a hybrid IC containing five pairs of PNP tran-
ing reception, these signals change to SSR, CWR, RYR, AMR ,
sistors and diodes . and FMR . During transmission, these signals change to SST ,
Figure 22 shows its equivalent circuit . When the mode sig-
CWT, RYT, AMT, and FMT .
nals SSB, CWB, RYB, AMB, and FMB are applied to pins 6
~ t t
LL LL
4 F
Q Q
2 H
3
3
C> V
BX6124
Fig . 22 Mode control circuit
L
15 . Expand function
Control unit (X53-1450- 11
D No .
Shipped
Diode cu t
65
Mode beep tone Morse
Single ton e
66
10Hz display OFF
O N
67
Memory protect OFF
O N
73
CW shift 800Hz
400H z
78 W 24
TX No
Ye s
79 W 18
TX No
Yes
Table 14 Expand function
I
24