TB 9-5985-314-24
10. Final Procedure
a. Deenergize and disconnect all equipment.
b. Annotate and affix DA label/form in accordance with TB 750-25.
CALIBRATION PROCESS FOR VSWR BRIDGES
11. Preliminary Instructions
a. The instructions outlined in paragraphs 11 and 12 are preparatory to the calibration
process. Personnel should become familiar with the entire bulletin before beginning
the calibration.
b. Items of equipment used in this procedure are referenced within the text by common
name as listed in table 1.
c. Unless otherwise specified, verify the result of each test and, whenever the test
requirement is not met, take corrective action before continuing with the calibration.
12. Equipment Setup
a. Use Appendix B to determine TI parameters for directivity.
NOTE
Clean all connectors with alcohol before proceeding with b
below.
b. Connect equipment as shown in figure 1 and allow 1 hour for equipment warm-up.
NOTE
Do not connect TI into equipment setup at this time.
c. Determine and record a minimum of 10 evenly spaced test frequencies over the TI
entire frequency range.
13. Directivity
a. Performance Check
and adjust RF OUTPUT controls for +6 dBm. Connect N-short to TI DEVICE UNDER TEST
port.
(2) Connect TI as shown in figure 1 equipment setup.
Press receiver system
frequency to test frequency recorded in 12 c above.