Acom 2020S - Band Change, Standard and Expanded Frequency Coverage

User's Manual | ACOM 2020S | 1.8-54 MHz Linear Power Amplifier
June 2022
Sec t i o n OPERATION | Page 39 of 76
c) AUTO OPERATE user settings
AUTO OPERATE user setting can be turned on/off by the operator in the USER PREFERENCES menu (see
Section 5.1 Menu USER PREFERENCES and Figure 5-2 | Menu USER PREFERENCES) or by a remote control
command.
When the AUTO OPERATE user setting is OFF, the two modes OPERATE and STANDBY can be changed
alternatively by the OPR/STB button or by a remote control command. At a SOFT FAULT protection trip, the
amplifier will revert to STANDBY mode and wait for the operator to return it to OPERATE mode by pressing
the OPR/STB button.
When AUTO OPERATE is ON (see Section 5.1 Menu USER PREFERENCES), the amplifier will start up in
OPERATE mode as soon as you turn it on. At a SOFT FAULT protection trip, the amplifier will also revert to
STANDBY mode, but will return automatically to OPERATE mode in about 4 seconds.
Even at AUTO OPERATE on, the operator can revert to and remain in a STANDBY mode manually by the
OPR/STB button or by a remote command. The next OPR/STB button push or remote command will switch
the amplifier to the OPERATE mode and restore the normal operation of the AUTO OPERATE user setting.
4.2. Band Change, Standard and Expanded Frequency Coverage
When connected to a transceiver with CAT, the amplifier will change frequency bands automatically,
following the transceiver's operating frequency changes.
Without CAT connection, the bands can be changed either manually or automatically (by the built-in
frequency counter).
The bands are changed manually via the ten band-selection buttons (see Figure 3-2 | Basic screen, Pos. 2 and
Section 3.5 Control System - Buttons and Menus, Point 2).
For an automatic band change via the built-in frequency counter, make a quite short pre-transmission
(100 ms is enough) and release the PTT for a moment before the main transmission.
If the new frequency is out of the amplifier's frequency range (see Section 8.1.a) Frequency Coverage), the
transmission request will be denied and the following fault message will appear on the screen:
"FREQUENCY OUT OF RANGE"
The amplifier specifications are guaranteed within the bands listed in Section 8.1.a)
Frequency Coverage.