Kenwood TKR-740 Service Manual page 17

*3 TD ; TX Data input-transmit signalling (QT / DQT / LTR)
input. (Impedance 600Ω)
TA ; TX Audio input-transmit audio input.
(Impedance 600Ω)
RD ; Receiver detector output non-squelched, non-de-
emphasized detector audio output ( 80mVrms/4.7kΩ)
RA ; Receiver Audio output-with de-emphasis, filtering
and squelched, line level only (not for driving a
speaker). ( 400mVrms/ 4.7 kΩ)
PTT ; Press-to-Talk-external transmit key line.
TXG ; TX Ground-common ground.
1.4. REM T I/ O jack
Connector No.
1 Remote RA (RX Audio output)
2 Remote TA (TX Audio input)
3 Remote PTT
4 EXT MON
5 GND
6 AUX I/O 1
7 AUX I/O 2
8 AUX I/O 3
9 AUX I/O 4
10 AUX I/O 5
11 AUX I/O 6
12 AUX I/O 7
Notes:
*1 Remote RA ; Receiver Audio output with de-emphasis to
Remote Terminal.( 400mVrms/ 4.7 kΩ Load)
Remote TA ; Transmit audio signal input from Remote
terminal.(Impedance 600Ω)
Remote PTT ; Press-to-Talk for Remote Terminal transmit
key.
*2 AUX I/O 1-5 can be programmed for AUX Input, AUX
Output or (BCD) Channel Select.
AUX I/O 6-7 can be programmed for either AUX Input or
AUX Output.
*3 AUX I/O 1-5: Provides 1 of 32 channel selection via 5 bit
Binary Coded Decimal (BCD) on REMT I/O connector.
APPLICATION NOTE
Terminal Name
Audio output, line level
Audio input, line level
Remote PTT input (Active-Low)
External Monitor input (Active-Low)
Ground
External Ch 1 or programmable Function
External Ch 2 or programmable Function
External Ch 3 or programmable Function
External Ch 4 or programmable Function
External Ch 5 or programmable Function
Programmable Function
Programmable Function
*4 The output logic level of all AUX O terminals (Section 1.3,
1.4), including any AUX I/O programmed as "AUX Output"
with the KGP-47D may be selected as either Active-High
or Active-Low. Note: If Active-Low is selected in KGP-
47D, the AUX Output port will be driven temporarily High
for about 500ms immediately after a forced reset or when
power is first applied. External equipment must have
appropriate de- bounce.
AUX O
Power ON or Reset
*5 EXT MON is the same as EXT MON on the REMT I/O (Section
1.4).
Description
Select channel No. 10 9 8 7 6 pin
1
2
3
4
...
29
30
31
32
1
4
7
10
REM T I/ O jack (View ed from Back Panel)
TKR-740
For about 500ms,
the AUX O is driven High
I/ O Level
*1 O 400mVrms
*1 I 140mVrms
*1 I 0 or 5V
I 0 or 5V
*2 *3 I/O 0 or 5V
*2 *3 I/O 0 or 5V
*2 *3 I/O 0 or 5V
*2 *3 I/O 0 or 5V
*2 *3 I/O 0 or 5V
*2 *4 I/O 0 or 5V
*2 *4 I/O 0 or 5V
1 1 1 1 1
1 1 1 1 0
1 1 1 0 1
1 1 1 0 0
...
0 0 0 1 1
0 0 0 1 0
0 0 0 0 1
0 0 0 0 0
2 3
5 6
8 9
11 12
17