HC3
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User Manual
Rev. 1.0L - 16/05/01
FOLBACK intervention adjustment
•
Be sure that the exciter is not operative.
•
Measure the voltage on the PIN1 of JP7 on the power supply card with a
multimeter, than rotate the trimmer TR9 to obtain a voltage of 0V.
Forward power reading adjustment
•
Increase to 5000W at 98MHz, using as a reference the reading on the wattmeter
that possibly has been connected at the end of the attenuation chain at the RF
output.
•
Rotate TR1 to read on the display the same value measured with the wattmeter.
Reflected power adjustment
•
Apply an unbalanced load in series with a 50 Ohm load and apply in series a
by-pass wattmeter BIRD.
•
Increase slowly the exciter power to obtain a reflected power of 500W at 98MHz.
•
Adjust TR2 to read on the display the same value measured with the wattmeter.
VPA reading adjustment
•
For the hybrid combiner this reading is disabled.
IPA measurement adjustment
•
For the hybrid combiner this reading is disabled.
Input power reading adjustment
•
Connect to the RF input a by-pass wattmeter BIRD with a full-scale of 10 W.
•
Connect a 50Ohm load to the exit and increase slowly the exciter power to
obtain 5W on the instrument in series to the input.
•
Rotate TR3 on the CPU assembly to read on the display the correct value
measured with the wattmeter.