This section provides typical line sweep measurements used to analyze the performance of a transmission feed line system including Return Loss, Cable Loss, and DTF.
Return Loss Measurement
Return Loss measures the reflected power of the system in decibels (dB). This measurement can also be taken in the Standing Wave Ratio (SWR) mode, which is the ratio of the transmitted power to the reflected power.
System Return Loss measurement verifies the performance of the transmission feed line system with the antenna connected at the end of the transmission line.
Device Under Test: Transmission Feedline with Antenna
1. Press the Measurements main menu key and select Return Loss.
2. Press the Freq/Dist main menu key and enter the start and stop frequencies.
3. Press the Amplitude main menu key and enter the top and bottom values for the display.
4. Press Shift and Calibrate (2) to calibrate the instrument. See Calibration for details.
5. Connect the Device Under Test.
6. Press the Marker main menu key and set the appropriate markers as described in Markers.
7. Press Shift and Limit (6) to enter and set the limits as described in Limit Lines.
8. Press Shift and File (7) to save the measurement. See the User Guide for details.
