Chapter 4 Measurements
Antenna Subsystem Return Loss Test
Antenna Subsystem return loss measurement verifies the performance of the transmit and receive antennas. This measurement can be used to analyze the performance of the antenna before installation. The antenna can be tested for the entire frequency band, or tested to a specific frequency range. Transmit and receive frequency measurements are conducted sep- arately. The following steps explain how to measure the antenna loss in return loss mode.
Required Equipment
Site Master Model S251C
Precision Open/Short, Anritsu 22N50 or Precision Open/Short/Load, Anritsu OSLN50LF
Precision Load, Anritsu SM/PL
Test Port Extension Cable, Anritsu
Optional
Device Under Test
Antenna Sub Assembly
Procedure
Step 1. Press the MODE key.
Step 2. Select
ENTER.
Step 3. Set the start and stop frequencies, F1 and F2, as described on page
Step 4. Connect the Test Port Extension cable to the RF port and calibrate the Site Mas- ter as described on page
Step 5. Press SAVE SETUP and save the calibration set up (page
Step 6. Connect the Device Under Test to the Site Master phase stable Test Port Exten- sion cable.
Step 7. Press the MARKER key.
Step 8. Set marker M1 to 750 MHz and M2 to 829 MHz.
Step 9. Record the lowest return loss over the specified frequency.
Step 10. Press SAVE DISPLAY (page