Kenwood TS-890S Operation Manual - Page 171
Controlling the Linear Amplifier
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OTHER FUNCTIONS 16 Controlling the Linear Amplifier This section describes the procedures for configuring the control signal and TX/RX delay when using a linear amplifier. Outputs of the mechanical relay (MKE, BRK, COM) and semiconductor switch (RL) are output to the REMOTE connector on the rear panel, which allows users to combine the use of this transceiver with their linear amplifier. The control signal status and whether to enable TX delay time can be configured on the menu screen. HF band, 50 MHz band and 70 MHz band (E type only) can be configured separately. General Linear Amplifier Connection Follow the diagram below to connect a commercially available linear amplifier. • The ALC circuit of this transceiver starts to operate from an ALC output voltage of approximately -4 V (which can be changed from the Linear Amplifier menu) from the linear amplifier. To enhance the stability of the output and ALC operation, it is recommended that the TX output power limiter function be configured. • For more details on connection with a linear amplifier, please refer to the instruction manual of the linear amplifier to be used. Connection • Use the supplied 7-pin DIN plug to make your own connection cable. TL-922 Connection Connect terminal no. 2 (COM) of the REMOTE connector to GND of TL-922, and terminal no.4 (MKE) of the REMOTE connector to RL CONT of TL-922. Connect terminal No. 6 (ALC) of the REMOTE connector to ALC OUT of TL-922. Connect to either ANT 1 or 2. TS-890S TS-890S 7-pin DIN Plug Linear Amplifier (Commercially Available) 7-pin DIN Plug TL-922 3'*/165 3'065 (/% "-$ 59 $POUSPM "$_7 )[ .. GND RL CONT ALC COM MKE 2 4 5 1 3 6 7 GND REMOTE Connector (View from Rear Panel) (RX) (TX) ALC COM BRK MKE 4 2 5 1 3 6 7 LKY GND 10Ȑ REMOTE Connector (View from Rear Panel) 10Ȑ ON during Active High/transmission: 12 V ON during Active Low/transmission: "L" ● The method for controlling linear amplifiers varies with the type of linear amplifier in use. There are some linear amplifiers that place this transceiver in the TX mode once the control terminal is connected to GND. When using such types of linear amplifiers, connect terminal no. 2 (COM) of the REMOTE connector to GND of the linear amplifier, and terminal no. 4 (MKE) of the REMOTE connector to the control terminal of the linear amplifier. 16-13
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