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PJ300M
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User Manual
Rev. 7.0 - 25/07/03
At this point, it is possible verify how the module works at nominal power:
•
Enable the power ouput from the exciter (switching it on and waiting for the PLL to
lock, or exiting from the stand-by mode).
•
Gradually rise the power of the exciter and monitor the power output of the amplifier,
until it reaches its nominal value of 300W.
A correctly adjusted amplifier has :
Pout= 300W, 8W< Pin< 12W and 8A< Ipa< 9.5A
Little differences in the current drawn by different modules are due to the different
gains of the MOS-FET devices (BLF 278).
10.3
Alarms Card Adjustment
NOTE: Make sure that this replacement is really necessary.
•
After changing the board, connect the amplifier as shown in the figure.
•
Switch on the PJ300M
•
Pot the measurement selector on position “V”
•
Adjust the trimmer R14 on the alarms card to have a reading of 50V (make shure
the voltage of the power supply is really 50V)
•
Switch on the exciter and wait for the PLL lock
•
Increase the ouput power to a level of 300W measured on the external wattmeter
•
Adjust the FWD reading with trimmer R11
•
Now increase again the drive power up to approx. 15 W, so that an output power
of 325 W is reached. Adjust R26 on the alarms card to trigger the lock condition
of the amplifier due to the overdrive protection. These valus may slightly vary at
the different frequencies.
•
Reduce the drive power to the minimum value, switch off the amplifier and the
exciter.
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