TM-9-1290-365-24-P
PALADIN MUZZLE VELOCITY SYSTEM M93 UPGRADED
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST
OCTOBER 2000
TM-9-1290-365-24-P - Page 288 of 334
ARMY TM 9-1290-365-24&P
D.9.3.2.2 Insertion Loss Without PIN Switch. The calibration of the microwave measurement equipment
setup is performed in the following way:
a. The PIN switch and dummy load are disconnected from the test setup.
b. A power meter is connected to the coupling output of the directional coupler and to the output of
the 20dB fixed attenuator.
c. A signal source of 0 to 2OdBm power (Pi) and frequency of 10525±25MHz is inserted through the
SMA female/female adapter.
d. The variable attenuator is set to 0dB attenuation.
e. The phase shifter is adjusted for maximum power on the fixed attenuators output.
f.
The power on the fixed attenuator output and the coupling output are recorded.
Pc(dBm) = Coupling output
Pa(dBm) = Fixed attenuator output
g. The insertion loss for both outputs is calculated:
Kp = Pi - Pc (coupling attenuation factor in dB)
Ka = Pi - Pa (insertion loss at fixed attenuator output in dB)
Pi = input power from the signal source in dBm
D.9.3.2.3 Return Loss of the PIN Switch. The PIN switch is tested for its return loss (RL) when the switch
is off. The OFF position is defined while the PIN SW is set to isolate between input and output port, and
reflect the power to the input port. The PIN switch is biased in accordance with its manufacturers
requirements during tests.
NOTE
For this test, the PIN SW. output of the test fixture AY6708043-0 can be used to bias the
tested PIN switch. Refer to Figure D-41 .
D.9.3.2.4 Calculation of Overall Insertion Loss. The overall insertion loss of the microwave test equip-
ment setup is calculated as follows:
Ks=2xKa+ RL+3dB+9.94dB
where:
Ks = overall insertion loss factor in dB
2 = multiplier for a signal travelling both ways
Ka = insertion loss of the microwave test equipment setup as was previously measured
RL = return loss of the PIN switch in dB
3dB = correction for -3dB power reflection as a result of on/off chopping of the signal by
the PIN switch.
9.94dB = correction for -9.94dB in reflected power as a result of the first spectral
component.
D.9.3.2.5 Factor Marking. The coupling attenuation factor (Kp) and the overall insertion loss factor (Ks)
are marked using a sticker on the directional coupler as follows:
Kp=XX.XdB
Ks = XX.X dB
XX.X = the result achieved after calculations.
END OF CALIBRATION
D-118
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