User's Manual

17
C A U T I O N
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 amplier in due time by grounding the control KEY
IN input not later than 10ms before feeding drive power toward
the amplier RF input. Otherwise, the protection system will read
“HOT SWITCHING ATTEMPT” and will trip off.
In Operate mode the KEY OUT output (S. 2-3(c)) follows the state of the KEY-IN input only after all
conditions for safe transmission have been found good by the amplier control unit. The KEY OUT
output duly disables transmission, if the amplier is not ready.
The two modes - Operate and Stand-by - may alternatively be changed:
- either manually (locally) – by pressing the OPR/STB button – see the basic screen in Fig. 3-2,
or automatically – when if the AUTO OPERATE option is activated – see S. 5-4(c).
N O T E
Access to the Operate mode can be locked in the AMP SERVICE
menu, the OPERATE ACCESS option (S. 5-2 and Fig. 5-2).
c) AUTO OPERATE option can be turned on/off by the operator in the USER PREFERENCES
menu – S. 5-4 and Fig. 5-4 - or by a remote control command.
When the AUTO OPERATE option is OFF, the two modes Operate and Stand-by can be changed
alternatively by the OPR/STB button or by a remote control command. At a SOFT FAULT protection trip,
the amplier will revert to Stand-by and wait for the operator to return it to Operate by pressing the OPR/
STB button.
When AUTO OPERATE is ON (S. 5-4), the amplier will start up in Operate mode. At a SOFT FAULT
protection trip, the amplier will rst revert to Stand-by, 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 Stand-by mode manually by the
OPR/STB button or by a remote command. The next OPR/STB button push will switch the amplier to
the Operate mode and restore the normal operation of the AUTO OPERATE option.
4-2. Band change, standard and expanded frequency coverage
When connected to a transceiver with CAT, the amplier 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
(100ms is enough) – a CW dit, or a sound on SSB) and release a PTT for a moment before the main
transmission.
If the new frequency is out of the amplier’s frequency range (S. 8-1(a)), the transmission request will
be denied and the following fault message will appear on the screen:
“FREQUENCY OUT OF RANGE”
The amplier specications are guaranteed within the bands listed in S. 8-1(a)). Frquency coverage
changes could be negotiated with the manufacturer.