MAINTENANCE MANUAL
IFR 6000
2-2-3
Page 5
Aug 1/06
(2) VSWR at ANT and RF I/O Ports
TEST EQUIPMENT: Spectrum Analyzer
VSWR Bridge
VERIFICATION FAILURE: If any step in this procedure fails or is out of tolerance,
this indicates a failure in the Test Set. Refer to
Troubleshooting for corrective action.
STEP PROCEDURE
1. Connect Tracking Generator to the ‘Input’ port of the VSWR Bridge.
2. Connect the output of the VSWR Bridge to the Spectrum Analyzer input.
3. Set up Spectrum Analyzer as follows:
Tracking Generator: 0dBm
Start Frequency: 950MHz
Stop Frequency: 1230MHz
Reference Level: -10dBm
Scale: 10dB/div.
Marker 1: ON
4. Record the level readings from the Spectrum Analyzer at 962, 1030, 1090, 1150,
and 1213MHz using Marker 1.
5. Press the SETUP key twice to display the SETUP-DME screen.
6. Verify the RF PORT shows ANTENNA. If necessary, change it to ANTENNA.
7. Press the DIAG Soft Key to display the DME DIAGNOSTICS screen.
8. Press the SELECT Soft Key to display the DME DIAG- CW screen.
9. Set up the UUT as follows:
FREQ: 1000MHz
RVLVL: -65dBm
10. Connect the 'Device Under Test' port of the VSWR Bridge directly to the
ANT port.
11. Get the level readings from the Spectrum Analyzer at 962, 1030, 1090, 1150,
and 1213MHz and calculate the return loss at each frequency.
12. From the return loss, calculate the VSWR as:
Γ = 10 ^ (– RL / 20)
VSWR = (1 + Γ) / (1– Γ)
13. Where: Γ = Reflection Coefficient
RL = Return Loss
14. Verify VSWR < 1.7
15. Move the 'Device Under Test' port of the VSWR Bridge to the RF I/O port.
16. Get the level readings from the Spectrum Analyzer at 962, 1030, 1090, 1150,
and 1213MHz and calculate the return loss.
17. From the return loss, calculate the VSWR as in equation above.
18. Verify VSWR < 1.3
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