Acom 700S - 4.2. Band Change and Frequency Coverage

User's Manual | ACOM 700S | 1.8-54 MHz Linear Amplifier
Page 40 of 92 | S e c t i o n OPERATION
April 2024
Access to the OPERATE mode can be locked in the AMP SERVICE menu, the OPERATE
ACCESS user setting (see Section 5.2 Menu AMP SERVICE (Amplifier Service Functions) and
Figure 5-3 | Menu AMP SERVICE).
c) AUTO OPERATE user setting
AUTO OPERATE user setting can be turned on/off by the operator in the USER PREFERENCES menu (see
Section 5.4 Menu USER PREFERENCES and Figure 5-5 | 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 and wait for the operator to return it to OPERATE by pressing the OPR/STB
button.
When AUTO OPERATE is ON (see Section 5.4 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, 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 by the up and down BAND buttons.
For an automatic band change via the built-in frequency counter, make a quite short pre-transmission
(100 ms is enough) - a CW dit, or a sound on SSB) 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) Standard 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) Standard Frequency Coverage.