TB 9-4931-523-35
(2) Determine signal generator No. 2 frequency (LO) required for the desired
measurement by calculating the following equation:
LO = (RF -IF)/2
Where:
RF = Frequency of signal generator No. 1 above,
IF = Intermediate frequency at which receiver system is to perform measurement (0.700 GHz)
EXAMPLE:
Let IF =
0.700 GHz
Let RF =
18 GHz
Let LO =
signal generator No. 2 frequency
LO
=
(RF-IF)/2
LO
=
(18 GHz-0.700 GHz)/2
LO
=
17.3 GHz/2
LO
=
8.65 GHz
(3) Adjust signal generator No. 2 frequency controls to value determined in (2)
above and RF output to controls +8 dBm.
(4) Connect POINT A to POINT B (fig. 2).
NOTE
Use adapters as needed.
NOTE
Use waveguide to coaxial adapters when TI is coaxial.
(5) Establish a reference on receiver system at 0.700 GHz.
(6) Set TI for 0 dB or minimum attenuation and insert TI between POINTS A and B
NOTE
Ensure TI is in measurement mode.
(7) Measure and record receiver system indication as insertion loss. This value will
be within the tolerances listed in appendix A.
(8) Establish a new reference on receiver system.
(9) Increase TI attenuation setting in one-step increments (or one cardinal point as
desired).
(10) Measure and record receiver system indication. Measured attenuation will be
within the range and accuracies listed in appendix A for TI being calibrated.
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