21
V2802A Option M81
Trouble Shooting the Distribution unit
Troubleshooting the Distribution Unit
RF Path Checks
If you suspect a RF signal path problem, the following procedure is provided to check
all RF signal paths through the Distribution unit.
Equipment Needed
•
Two RF flex cables, 3.5 mm (m/f)
•
Two coax attenuators, 3.5 mm, 10 dB
•
One coax connector adapter, 3.5 mm (f/f)
•
Seven 50 Ohm Terminations, 3.5 mm or SMA male
•
Network Analyzer with 400 MHz to 6 GHz operating capability
Equipment Setup
1. Turn on the Distribution unit and the PNA (or equivalent).
2. Set the analyzers frequency range of 400 MHz to 6 GHz and IF BW to 1 kHz.
3. Connect two flexible RF cables to Ports 1 and 2 on the analyzer.
4. Configure the analyzer and make an S21 measurement.
5. Set the source power level to -5 dBm.
6. Using appropriate coax attenuators and adapters connect the two cable ends
together.
7. Perform an S21 Normalization.
Figure 10
Equipment Setup
Normalization
S21
Port 1
Port 2
PNA
V2802A-M81
Measurement
S21
Port 1
Port 2
PNA
Attn2 (10 dB)
3.5 f/f
RF
Cables
Attn1 (10 dB)
OUT 8
LO IN
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