User's Manual Part 2
T
ECHNICAL
D
OCUMENTATION
P
ROTECTING
P
EOPLE AND
A
SSETS
®
D
ATE
:
22
M
ARCH
2017
|
V
ERSION
:
1.4
73
R
ANGER
-X5
R
ADAR
S
YSTEM
T
ROUBLESHOOTING
,
M
AINTENANCE
,
AND
C
ALIBRATION
EEC
®
|
C
OMPANY
P
ROPRIETARY
Equation for Duty Cycle Power Correction in dB
When using a Peak Power Meter the Duty Cycle Correction, do not apply the correction to the calculation for
peak power.
16. Using the spectrum analyzer connected to the bidirectional coupler forward port (using
attenuators as required to protect the test equipment), measure and if necessary set, the
RF frequency. Record the frequency for the selected Pulse Width on the test data sheet.
17. De-radiate the system. If not already connected, connect the power meter to the
bidirectional coupler forward port at the transmitter. Zero the power meter. Radiate the
system. Measure and record the power meter measurement.
18. Using the frequency recorded above, find and record the attenuation of the bidirectional
coupler from the calibration chart attached to the FWD port. Compute the peak RF power
from the data recorded above as follows:
Peak power in dB = duty cycle correction factor (if applicable) + coupler attenuation + or the
power meter reading.
For example, assume the following:
Parameter
Measured Value in dB
Notes
Duty Cycle Correction Factor
32.95
See note in step
6
Coupler Attenuation
53.43
See vendor data attached to coupler
Power Meter Reading
-
3.28
Peak Power at TX Coupler
83.1
Sum of columns 1
-
3
Table 7 Peak Power Calculation using Duty Cycle Correction
19. If applicable compute the waveguide line loss and record.
For instance, assume the following:
Parameter
Measured value in dB
Notes
Duty Cycle Correction Factor
32.95
See note in step
6
Couple Attenuation
30.00
See vendor data attached to coupler
Calibrated Attenuator Loss
20.00
See vendor data
Power Meter Reading
-
0.85
Peak Power at Antenna
82.10
Sum of columns 1
-
4
Waveguide Loss
01.00
Power at TX
–
Power at
Antenna
Table 8 Example of Peak Power Calculation
20. Repeat steps 4 thru 18 for the remaining three pulse widths.
21. Record the test results in the Peak Power Test Results – Table 9.
PRFxPW
1
log10