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PJ300M
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User Manual
Rev. 7.0 - 25/07/03
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To calibrate the SWR reading and alarm and the INT SWR alarm, connect two
paralleled dummy loads to the RF output connector of the amplifier as it’s shown
in the figure. It is also possible to use a cavity filter slightly misadjusted with respect
to the working frequency.
•
Switch on the amplifier and the exciter and wait for the PLL to lock.
•
Select “RFL” with the meter selector, and set the external wattmeter for reflected
power reading.
•
Increase the output power to obtain a reading of 40W of reflected power on the
external wattmeter. Now adjust the trimmer R13 on the alarms card to obtain the
same reading on the PJ300M meter.
•
Move R40 on the alarms card and check the LED SWR INT is lit. Now measure
the voltage on pin 13 of U1 and adjust R40 to have 1.6V.
•
With 40W of reflected power, adjust the trimmer R56 on the alarms card until the
protection “SWR ANT” is triggered
NOTE: This setting may vary with the working frequency, it is preferable to
make this adjustment at the operating frequency.
•
Overtemperature alarm check (temp.)
•
Check the overtemperature protection by short circuiting the terminals of the
temperature sensor placed on the RF power amplifier module; the appropriate
led will light, and the amplifier will stop.
•
External stand-by check (EXT. ST. BY)
•
Check the EXT. ST. BY protection by short circuiting the pin 8 and 22 of the
telemetry connector and verify that the EXT. ST. BY led lights and the amplifier will
stop.
•
Short circuiting the pin 21 and 22 of the telemetry connector will regularly restart.
NOTE: The operation performed in the last two steps will reset all the alarm
memories returning the amplifier to the conditions of the first power on.
10.4
Soft-Start Adjustment
No adjustment are needed after this board has been changed.
NOTE: Pay attention to the correct insertion of the connectors.
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