Operation; Change Of Modes Rx/Tx And Operate/Standby; Auto Operate User Setting - Acom 1200S Installation, Operation And Maintenance Manual

4. OPERATION

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

4.1.
a) STANDBY mode
In STANDBY mode, as well as when the amplifier is not powered, receiving and transmitting (no more than
200 W) with the transceiver is done via RF bypass between RF INPUT and RF OUTPUT of the amplifier. In
STANDBY, 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
unconditionally.
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 by-pass 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.
In order to provide time for the relays to switch safely from receive to transmit, the
transceiver should provide a dead time, i.e., must "notify" the amplifier in due time by
grounding the control KEY-IN input not later than 10 ms before feeding drive power
toward the amplifier RF input. 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. When used,
the KEY-OUT output duly disables transmission while the amplifier is not ready.
The two modes OPERATE and STANDBY may be changed:
Manually (locally) - by pressing the OPR/STB button alternatively (see
•
without ACOM 04AT antenna tuner assigned
Automatically at a SOFT FAULT protection trip - when the AUTO OPERATE user setting is
•
activated (see Section
Access to the OPERATE mode can be locked in the AMP SERVICE menu, the OPERATE
ACCESS user setting (see Section
Page 30 of 60 | S e c t i o n OPERATION
User's Manual | ACOM 1200S | 1.8-54 MHz Linear Power Amplifier
2.4.c) KEY-OUT socket
2.4.c) KEY-OUT socket
, Pos. (1));
4.1.c) AUTO OPERATE user settings
5.4 Menu USER PREFERENCES
) follows the KEY-IN input
) follows the KEY-IN input only
Figure 3-2 Basic screen
).
and
5.4.e) OPERATE ACCESS
).
August 2021