Safety Instructions

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• If the Screen current is lower than 0 mA (negative value), change it by pressing the LOAD button
until 0 mA is set and check again for maximum output power. Do not start with very low input
power, set abt. 50% before beginning M-tune process.
• If you reached the desired maximum output power, and the PA Screen current is inside 0 / +40mA ,
then press the SAVE button.
Notice 1: If the tuning process takes more than 1 minute, allow for a short break to prevent temperature
overloading of the PA.
Notice 2: If you use the PA with the output power adjusted lower than the maximum settings , Screen
current can take negative values. There is no need to readjust the PA, it is still working in the linear mode.
We can now see a new small yellow
USER window in the touch screen
display. USER means that we used the
M-TUNE feature to optimize the PA
adjustment.
If you want to go back to the default
factory settings, use CLEAR USER
SETTINGS in the MENU settings (page
19) for one band or all bands.
If the amplifier demonstrates any malfunctions during tuning or it does not behave in accordance witch
the M-TUNE procedure, interrupt the tuning procedure immediately and check the amplifier! Be sure
there are not any mistakes in choosing antennas, bands or segments! Insure that VSWR is not higher
than 3:1 and input power is LOW!
6. MAINTENANCE
6.1. Indication of Fault Conditions
If a fault condition appears during the operation of the amplifier, the safety circuits of OM4001A will react
immediately. There are several types of warning or fault messages that may appear on the display when
any of the protection circuits are activated. The OM4001A power amplifier provides the following
protection:
Power Out is too high
Refl. power too high
Power In is too high
Low output power (tune)
Plate current too high
Type of supported TCVR and
working
frequency are visible on the display.
AUTO LED is ON.