TB 9-4931-523-35
(2) Connect POINT A to POINT B (fig. 1).
NOTE
Use adapters as needed.
NOTE
Use waveguide-to-coaxial adapters when TI is waveguide.
NOTE
Use 50Ω-to-75Ω or 50Ω-to-93Ω adapters when TI is 75Ω or
93Ω.
(3) Establish a reference on the receiver system at test frequency recorded in 7a
above.
(4) Connect TI between POINTS A and B (fig. 1).
NOTE
Ensure receiver system is in measurement mode.
(5) Measure and record receiver system indication. Measured attenuation will be
within range and accuracies specified in appendix A for TI being calibrated.
(6) Disconnect TI from equipment setup and repeat (1) through (5) above for
remaining test frequencies recorded in 7a above.
b. Adjustments. No adjustments can be made; however, a correction chart may be
prepared listing actual receiver system indications at frequencies of interest.
9. Variable Attenuation Measurement (10 MHz to 18 GHz)
a. Performance Check
NOTE
When performing the following steps, if TI frequency range
extends above and below 1.3 GHz, it will be necessary to
perform two separate tests - one below and one above 1.3 GHz.
NOTE
When calibrating step attenuators, check each step, record
value, and add values. Sum should equal total value of
attenuator plus or minus accuracies.
above and adjust RF output controls for +6 dBm.
(2) Connect POINT A to POINT B (fig. 1).
NOTE
Use adapters as needed.
