Note that each of the 9 amateur bands has its own individual gain setting which can be saved
to the EEPROM. If you change a gain setting, a band, or the auto/manual setting, then when
you power the amplifier off you will be prompted whether you wish to save the new settings.
If either of the buttons is pressed and held, then the button will auto-repeat, and the repeat
speed depends upon the parameter being modified. This is particularly useful in the User
Configuration mode.
DISPLAY/CONFIG
This button has two functions. In the normal mode it allows the user to display a number of
internal parameters. From the normal display, a single push will show the current output
power. The next push will display the SWR, followed by the supply voltage, the amplifier
current, and finally the heat-sink temperature in either EC or EF.
If the frequency sense (F-SENSE) mode of automatic band detection is selected, then an
additional page can be displayed showing the input frequency in MHz to a resolution of 1kHz
and the current output power.
If the button is pressed and held, this will invoke the User Configuration mode, which is fully
covered in a later section. To exit from the User Configuration mode, briefly press the OPER
button, respond to the prompt, whereupon the normal display will return.
Whilst in the User Configuration mode, a brief press of the button will increment the page. If
the button is held, the pages increment automatically. A long beep will sound, and an
increased page switch delay will occur whenever page zero is selected.
If this button is pressed and held from the power off state, and then the amplifier is powered
up, it invokes the RS-232 loop-back test. If a computer running a terminal program is
connected to the RS-232 port, you can verify that the port is functioning correctly. Briefly
press the PWR button to exit.
OPER
This button has two primary functions. The first is used to place the amplifier in either the
standby mode or the operate mode. In previous versions of the firmware it was also used to
cancel alarms, this function has now been moved to the PWR button.
The second is to invoke the save settings menu from either the System Calibration or the User
Configuration functions.
With this firmware revision the amplifier will always power up in the standby mode as a
precaution, except when the System Setup is selected, when it will power up in the operate
state.
In the standby mode the signal path is straight through, with neither filters nor attenuation
present. A connected transceiver will be able to transmit and receive directly to the connected
antenna. The metering functions of the amplifier will operate to show the output power and
SWR, although at low power levels the accuracy is somewhat reduced.
4
