Linear Amplifier Control; Remote Connector - Kenwood TS-890S In-Depth Manual

03 TRANSMISSION CIRCUIT

Linear Amplifier Control

Linear amplifier control can be used for switching between transmission and reception of devices such as the linear
amplifier and transverter.

REMOTE Connector

The REMOTE connector is a 7-pin DIN type connector, the same as our conventional transceivers.
The LKY (Linear amplifier Keying) terminal (pin 7) is equipped with a logic to output 12 V on transmission and a logic for
short-circuiting to ground on transmission according to the linear amplifier menu setting which will be described later.
The "REMOTE Connector Pin Assignment" illustration shows the signaling paths allocated to the REMOTE connector
pins.
REMOTE Connector
(View from Rear Panel)
GND:
Connect to metal shield.
Terminal Terminal
No. Name
1 SPO
2 COM
3 SS
4 MKE
5 BRK
6 ALC
14
ON during Active High/transmission: 12 V
ON during Active Low/transmission: "L"
Fig. 16 REMOTE Connector Pin Assignment
Table 4 Terminal Descriptions for the REMOTE Connector
Speaker out
Common terminal of the built-in relay for linear amplifier control
PTT input
• Sends signal by grounding the SS terminal.
Make terminal of the built-in relay for linear amplifier control
• The make terminal can be connected to the common terminal during transmission
by configuring " Internal Relay Control " of the linear amplifier menu.
Rated control capacity of relay contact: 2 A/ 30 V DC (resistance load)
Maximum allowable voltage of relay contact: 220 V DC, 250 V AC
Break terminal of the built-in relay for linear amplifier control
• The break terminal can be connected with the common terminal when the latter is
not connected to a make terminal.
Rated control capacity of relay contact: 2 A/ 30 V DC (resistance load)
Maximum allowable voltage of relay contact: 220 V DC, 250 V AC
ALC input from the linear amplifier
• This is a negative input. The ALC circuit starts to operate from an input of
approximately -4 V (which can be changed from the Linear Amplifier menu).
(RX)
(TX)
MKE
ALC
10Ω
Function
COM
BRK
2
4 5
1 3
6 7
LKY
GND
Input/
Output
I/O
I/O
I/O
O
I
I