Kenwood TS-590SG Manual page 20

02 TRANSMISSION
The transceiver is equipped with a relay output for controlling devices such as a linear amplifier, as well as an RL terminal
(Pin 7) to which a voltage of approximately 12 V is output during sending. The relay output terminal and RL terminal output
can be adjusted in the setting menu No. 53 (HF bands) or No. 54 (50 MHz band) of the linear amplifier control. Table 2-1
describes the options available in the menu, and Figure 2-4 and Figure 2-5 show the timing charts.
Semiconductor Switch Control
Setting
(RL Terminal) *1
OFF
1 During the transmission: 12 V
2 During the transmission: 12 V
3 During the transmission: 12 V
During the transmission: Short
4
to GND (pin 1)
During the transmission: Short
5
to GND (pin 1)
*1 The RL terminal enables the operation logic during sending to be switched using the output of the semiconductor
switch.
Specify whether to output voltage or short to ground during sending. Controlling the linear amplifier without operating the
relay helps to achieve more silent operation. As a reference, the controllable current should be less than 10 mA.
100 Ω resistors arrayed in series are inserted to protect the internal circuit, which shifts the voltage according to the current
flow. Example: In the event of a 10 mA current, voltage decreases by 1 V (when the setting is 1, 2 or 3) or rises by 1 V (when
the setting is 4 or 5). Make use of your device within the safe range.
*2 Switch the operation of the relay (built-in linear amplifier control relay).
The rated control capacity of the relay contact is 2 A/ 30 V DC (resistance load), and the maximum allowable voltage is 220
V DC and 250 V AC.
High-voltage signals such as those of a vacuum tube amplifier can be switched. Control of the terminal voltage for TL-922
(approx. -140 V) is also possible.
*3 This feature extends the duration from the time sending starts to that when radio waves are output (approx. 10 ms
under normal circumstances) and from the time sending ends to that when output of the received audio starts (approx.
25 ms under normal circumstances). Note that if the full break-in setting is selected in the CW mode (and if the delay
time is set to FBK ), the transmit start time cannot be delayed.
In the event that the linear amplifier in use requires a relatively long time to switch between receive → send or
send → receive, such as the case of the TL-922, using this setting helps to prevent errors such as malfunction and noise
from occurring.
16
Table 2-1 Setting Menu of Linear Amplifier Control
Linear Amplifier Controls
Relay Control
MKE Terminal) *2
OFF
(COM/ BRK/ Transmit Start Delay Time *3
OFF
OFF
ON
CW/FSK: approx. 25 ms
ON
SSB/AM/FM: approx. 45 ms
OFF
CW/FSK: approx. 25 ms
OFF
SSB/AM/FM: approx. 45 ms
Amplifiers from
(10 ms)
(10 ms)
(10 ms)
(10 ms)
Compatible
Linear
KENWOOD
TL-933
TL-922