MAINTENANCE MANUAL
IFR 4000
2-2-3
Page 19
Aug 1/04
(8) VSWR (RF I/O and SWR Connectors)
TEST EQUIPMENT:
Spectrum
Analyzer
VSW R
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 test equipment as shown:
VSWR BRIDGE
SPECTRUM ANALYZER
INPUT
DEVICE UNDER TEST
OUTPUT
INPUT
TRACKING
GENERATOR
INPUT
RF I/O
056M-20
RF I/O CONNECTOR
2. Set the Spectrum Analyzer Tracking Generator Level to 0 dBm.
3. Set the Spectrum Analyzer Tracking Generator Frequency to 75, 225 and
400 MHz and record the levels as reference.
4. Connect VSWR Bridge (Device Under Test Connector) to RF I/O Connector.
5. Set the Spectrum Analyzer Tracking Generator Frequency to 75, 225 and
400 MHz and record the levels.
6. Calculate the return loss for the levels recorded in Steps 3 and 5 and record.
(Return Loss = Reference - Reading).
7. Verify VSWR is <1.3 for 75 MHz, <1.3 for 225 MHz and <1.35 for 400 MHz.
Γ
= 10 ^ (- RL / 20)
VSWR = (1 +
Γ
) / (1 -
Γ
)
Where
Γ
= Reflection Coefficient
RL = Return Loss
8. Disconnect VSWR Bridge from RF I/O Connector.
Summary of Contents for IFR 4000
Page 1: ...NAV COMM Test Set Maintenance Manual 1002 5600 4P0 IFR 4000...
Page 3: ...MAINTENANCE MANUAL IFR 4000 FOR QUALIFIED SERVICE PERSONNEL ONLY...
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