TS-440S
24
CIRCUIT D ESCRI PTION
1 4 . M ode control s ignals
Transmit/receive mode signals a re generated by IC
1 0
i n the
IF u nit. IC
1 0
is a hybrid IC conta i n i n g five pairs of PNP tran
sistors and diodes.
F i g u re
22
shows its equ ivalent c i rcu it. When the mode sig
nals SS B, CWB, RYB, A MB, and F MB a re applied to pins
6
a:
"
u_
15
I
a:
"
'"
>-
"
'"
14
>-
>-
a:
w
0
"'
"'
I
2 3
18
I
I
I
I
I
I
u
u
10
<D
"
u_
<D
"
'"
<D
>
a:
a:
>-
a:
to
1 0,
the voltages of control pins
1 6
and
17
cha nge. D u r
ing reception, these signals change to SSR, CWR, RYR, A MR,
and F MR. D u ring transmission, these signals change to SST,
CWT, RYT, A MT, and F M T .
>
;:
u
4 12
-
"'
<D
<D
<D
<D
;:
u
BX6 1 24
- - -
1
'"
'"
GND
8
CONT
1
-2 17
6
14A
Ql5 : DTC l l 4ES
Fig. 22 Mode control circuit
1 5 .
Expand function
Control unit (X53- 1 450- 1 1 I
D N o .
S h i pped
D i ode cut
6 5
M o d e beep t o n e
M o rs e ·
S i n g l e tone
66
1 O H z d i s p l a y
O F F
O N
6 7
M e m o ry p rotect
O F F
O N
7 3
CW sh ift
800Hz
400 H z
7 8
w 2 4
TX
N o
Y e s
7 9
w 1 8
TX
N o
Y e s
Table 1 4 Expand function