Operation; Change Of Modes Rx/Tx And Operate/Standby; Auto Operate User Setting - Acom 700S User Manual

User's Manual | ACOM 700S | 1.8-54 MHz Linear Amplifier

4. OPERATION

4.1. Change of Modes RX/TX and OPERATE/STANDBY; AUTO OPERATE User Setting

a) STANDBY mode
In STANDBY mode, as well as, when the amplifier is powered off, receiving and
transmitting (no more than 200 W) with the transceiver is done via RF bypass path
through RF INPUT to RF OUTPUT of the amplifier.
In STANDBY mode, as well as when the amplifier is powered off, the transceiver's RF power is not amplified,
the control KEY IN input does not affect the operation, and the KEY OUT output (see Section
) follows the KEY IN input unconditionally. The bands cannot be changed neither manually nor by
connector
CAT or remotely.
b) OPERATE mode
In OPERATE mode the receive-transmit (RX/TX) direction is controlled by the KEY IN input:
At open KEY IN (OPERATE/RX mode), the transceiver receives the signals from the antenna
•
through the same RF bypass path between RF INPUT and RF OUTPUT as with amplifier
turned off or in STANDBY mode;
At grounded KEY IN (OPERATE/TX mode) the RF drive is amplified and fed to the antenna
•
through the RF OUTPUT connector.
The transceiver must send a "Ground on transmit" signal to the amplifier KEY IN input at
least 10 ms before sending the RF drive signal to the amp's RF INPUT. This time (10 ms or
more) is necessary for the amp's relays to switch safely from receive to transmit status.
Read your transceiver's manual for instructions.
Otherwise, the protection system will read "HOT SWITCHING ATTEMPT" and will trip off.
In OPERATE mode the KEY OUT output (see Section
after all conditions for safe transmission have been found good by the amplifier control unit. The KEY OUT
output duly disables transmission while the amplifier is not ready.
The two modes OPERATE and STANDBY may be changed in three ways:
Manually (locally) - by pressing the OPR/STB button alternatively (see
•
Automatically at a SOFT FAULT protection trip - when the AUTO OPERATE user setting is
•
activated (see Section
By a remote-control command.
•
April 2024
2.4.c) KEY OUT connector
);
5.4.c) AUTO OPERATE
2.4.c) KEY OUT
) follows the KEY IN input only
Figure 3-2 | Basic screen
S e c t i o n OPERATION | Page 39 of 92
);