Configurations In The Advanced Menu - Kenwood TS-990S In-Depth Manual

04 TRANSMISSION
● Use of the Linear Amplifier Control Relay
The TS‑990S linear amplifier control relay functions on transmission if "Active High + Relay Control" has been selected
from Advanced Menu 11 or 12.
The linear amplifier control relay assumes that the TL‑922 (discontinued) is standing by and can be connected as‑is to
the TL‑922. For a linear amplifier that stands by with a voltage application or a short‑circuit to ground, disable the relay
control and make it standing by using the RL terminal as described later.
● Use of the RL Terminal
In addition to a logic to output 12 V on transmission, following the configuration in the Advanced Menu as described
later, in the same manner as conventional transceivers, a logic for short‑circuiting to ground on transmission by an open
drain is added to the RL terminal (pin 7). By this, to use a linear amplifier that is placed in the transmit state with the low
state logic for transmit control, the linear amplifier can be used without externally adding a transistor to reverse the logic.
When transmission starts while the RL terminal has been set to "Active High", the transistor switch shown in the
"REMOTE Connector Pin Assignment" is turned On and 12 V is diverted (10 mA or less). "Active High" indicates that the
logic is high while the circuit is active. If a linear amplifier which can be switched to the transmit state upon detection of
the voltage is connected, configure "Active High" for the RL terminal.
When transmission starts if "Active Low" has been configured for the RL terminal, the FET switch shown in "REMOTE
Connector Pin Assignment" switches to a short‑circuit to ground. "Active Low" indicates that the logic is low while the
circuit is active.
The linear amplifier, which can be switched to the transmit state while the signal pulled up by the linear amplifier is being
short circuited to ground, can be connected. If such a linear amplifier is connected, configure "Active High" for the RL
terminal. However, the amount of withstand voltage and current are not large (DC 15 V or less, 10 mA or less), thus it is
not possible to directly drive a relay in this circuit or to connect those which are activated with high voltage, such as an
evacuated‑tube type linear amplifier (e.g., TL‑922). In such a case, use relay contacts alternatively.

Configurations in the Advanced Menu

To control the linear amplifier, configure the settings in the Advanced Menu.
Advanced Menus 11 and 12 Setting Values
Off
Active High
Active High + Relay Control
Active High + Relay & TX Delay Ctrl
Active Low
Active Low + TX Delay Control
REMOTE connector pin 7
*1
REMOTE connector pins 2, 4, and 5
*2
20
Table 8 Linear Amplifier Control Settings Menu
RL Output
‑
TX: High (12 V)
TX: High (12 V)
TX: High (12 V)
TX: Low
TX: Low
Relay Control
*1 *2
‑
‑
○
○
‑
‑
Delay Time
10 ms
10 ms
10 ms
45 ms (SSB, FM, AM)
10 ms
45 ms (SSB, FM, AM)