Page 4-10 Vector-LP Radio Beacon Transmitter Technical Instruction Manual
Issue 1.1 Section 4 Testing and Adjustment
(i) In the Maximum Output Gain menu
(see 3.6.12.3), calibrate the duty cycle
and forward power as follows:
x Highlight the value for Set Duty Cycle.
Press Modify.
x Change the value to match the positive
duty cycle measured at TP17 in step
(c). Press Next.
x Change the value for Set Forward
Power to match the power calculated
in step (h).
(j) If the transmitter is operating at full
power, go to step (l). If not:
x Highlight the value for Maximum
Carrier Reference. Press Modify.
x Increase the value by 5. Press Done.
(k) Return to step (h).
(l) Set the maximum carrier reference:
x Record the current duty cycle and
forward power values.
x Record the power according to the
external current probe.
x Highlight the value for Maximum
Carrier Reference. Press Modify.
x Adjust the value to 1 higher than the
current Carr. Ref value. Press Done.
(m) The initial Forward Power
measurement should be within 20 % of
the actual value. In the Calibrate
Meters menu (see 3.6.12 and 3.6.12.1)
calibrate the Forward Power.
x Scroll through the parameters until
Forward Power is highlighted. Press
Modify.
x Adjust the reading to the same value
calculated in step (h). Record this
level. Press Done.
(n) Increase the power until maximum
power is reached. Record the power
level on the top line (status bar) of the
GUI display.
(o) Press Power Increase and Power
Decrease at the same time to set the
RF power to 0 W. Press RF Off.
4.3.6.4 CALIBRATING EXCITER DC
VOLTAGES AND AMBIENT
TEMPERATURE
(a) Measure and record the following dc
voltages on the control/display PWB
(A1):
x TP18 (approx. 24 V)
x TP12 (approx. 15 V)
x TP20 (approx. -15 V)
x TP9 (approx. 5 V)
(b) In the Calibrate Meters menu (see
3.6.12 and 3.6.12.1) scroll through the
parameters until +24 Volt P/S is
highlighted. Press Modify.
(c) Adjust the value to match the TP18
voltage measured in step (a). Press
Done.
(d) Repeat step (c) to calibrate the other
parameters:
x +15 Volt P/S (measured on TP12)
x -15 Volt P/S (measured on TP20)
x +5 Volt P/S (measured on TP9)
x AC Voltage
x Temperature (use a thermometer to
measure the ambient room
temperature
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