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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
q
Site Master Model S251C
q
Precision Open/Short, Anritsu 22N50 or
Precision Open/Short/Load, Anritsu OSLN50LF
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Precision Load, Anritsu SM/PL
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Test Port Extension Cable, Anritsu 15NNF50-1.5C
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Optional 510-90 Adapter, DC to 7.5 GHz, 50 ohm, 7/16(F)-N(M)
Device Under Test
q
Antenna Sub Assembly
Procedure
Step 1. Press the
MODE key.
Step 2.
Select FREQ-RETURN LOSS using the Up/Down arrow key and press
ENTER.
Step 3. Set the start and stop frequencies, F1 and F2, as described on page 3-2.
Step 4. Connect the Test Port Extension cable to the RF port and calibrate the Site Mas-
ter as described on page 3-2.
Step 5. Press
SAVE SETUP and save the calibration set up (page 3-5).
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 3-5) name the trace, and press ENTER.
Chapter 4 Measurements
4-10