High-Speed Relay-Controlled Antenna Tuner; Linear Amplifier Control; Remote Connector; Setting Menu Of Linear Amplifier Control - Kenwood TS-590SG Manual

2.2 High-speed Relay-controlled Antenna Tuner

TS-590S/SG has a built-in high-speed relay-controlled antenna tuner that was first employed in the TS-570. In contrast to
the variable capacitor type antenna tuner, it employs a small and lightweight relay to achieve a sufficient matching range
and a fast tuning operation with digital control. The control speed has been further accelerated over previous models.
When you return to a previously used operating band or frequency, the antenna tuner easily and quickly re-tunes.

2.3 Linear Amplifier Control

When connecting a linear amplifier, control it using the semiconductor switch or (mechanical) relay that is built into the
transceiver. The relay comes with floating make/break/common contacts, which is suited for the control of linear amplifiers
that do not support full break-in. Meanwhile, the semiconductor switch is suited for the control of linear amplifiers that
support full break-in, and enables more silent switch between sending and receiving than the relay.

2.3.1 REMOTE Connector

The REMOTE connector for connecting the linear amplifier with this transceiver comes with the same pin layout and
specifications as existing models. Not only so, its RL terminal is added with the "short to ground" logic during sending
that is supported on the TS-990S.
With the REMOTE connector, connection is made easier with commercially-sold linear amplifiers.
Pin 6 is the ALC terminal. When you use a linear amplifier or transverter, you can connect the external accessory device
to the ALC terminal in order to control the output to be within an appropriate range.
The ALC signal is a signal to shift the voltage in the minus direction (in KENWOOD s devices) when the output level requires
regulation to satisfy the requirements of the external accessory device. Generally external accessory devices have a VR for
adjusting the voltage. A negative voltage (approximately -7V) is applied to the ALC terminal to decrease the internal gain.

2.3.2 Setting Menu of Linear Amplifier Control

To control the sending and receiving of the linear amplifier, configure the settings using the menu (No. 53 or No. 54).
This setting includes options with the combinations of the signal setting for switching between sending and receiving and
the transmit start delay time setting. Select according to the linear amplifier used.
(RX)
Relay
(TX)
MKE
ALC
100Ω
Active High/
Active during TX：12 V
Active Low/
Active during TX："L"
Semiconductor switch
Figure 2-3 REMOTE Connector Pin Configuration
COM
BRK
2
4 5
REMOTE Connector
1 3
(View from the rear panel)
6 7
RL
GND
TRANSMISSION 02
15