High-Speed Relay-Controlled Antenna Tuner; Linear Amplifier Control; Remote Connector - Kenwood TS-990S In-Depth Manual

High‑speed Relay‑controlled Antenna Tuner
The TS‑990S has a high‑speed relay‑controlled antenna tuner, which digitally controls in a combination of capacitors of
different capacitance through switching relays. The digital control achieves high‑speed tuning.
The antenna tuner employs parts durable for operating at 200 W and has dedicated cooling fans to secure continuous
operation at 200 W.

Linear Amplifier Control

There are two control methods for switching between transmit and receive in the linear amplifier or the transverter; one
method is by using a relay for the linear amplifier and the other is by using the RL pin. Both methods allow you to send
the control signal via the REMOTE connector. The linear amplifier control can be enabled in the Advanced Menu, as
described later.

REMOTE Connector

The REMOTE connector is a 7‑pin DIN type connector, the same as our conventional transceivers. The REMOTE
Connector Pin Assignment illustration shows the signaling paths allocated to the REMOTE connector pins.
Fig. 31 REMOTE Connector Pin Assignment
Terminal No. Terminal Name
1
2
3
4
5
6
7
Fig. 30 Automatic Antenna Tuner Circuit
b
d e
a c
f g
Table 7 Terminal Descriptions for the REMOTE Connector
SPO Speaker output (SP1/ Internal Speaker)
COM Common terminal for signaling from the linear amplifier control relay
SS PTT input
MKE Make terminal for signaling from the linear amplifier control relay
BRK Break terminal for signaling from the linear amplifier control relay
ALC ALC input from the linear amplifier
RL Output for the linear amplifier control
(RX)
(TX)
ALC
Active High/ Active during TX: 12V
Active Low/ Active during TX: Low
Fig. 32 REMOTE Connector Terminal Description
Function
TRANSMISSION 04
COM
BRK
MKE 2
4
5
3
1
6 7
RL
I/O
O
I/O
I
I/O
I/O
I
O
19