TROUBLESHOOTING WORKSHOP

SWR too high?

Separate measurement setup, cable and antenna before changing antenna length.

Switch the transmitter off before working on the RF path. Never connect a VNA to a transmitting output. Consult each device’s manual for permitted power and SWR limits.

CHECK 3

Is reflection measurement calibrated for this setup?

Select S11 or SWR on the correct port. Frequency span and calibration plane must match the setup: adding a cable afterwards changes the measurement plane.

Yes, at the intended measurement plane No, or calibration is uncertain

Show check record

HB3YAQ · Check record: SWR too high?
Your answers; no automatic measurement.

1. Do cable, connectors and antenna connection look sound?
→ Yes, nothing visibly wrong
2. How are you measuring SWR?
→ With a VNA or antenna analyser

Is reflection measurement calibrated for this setup?
Select S11 or SWR on the correct port. Frequency span and calibration plane must match the setup: adding a cable afterwards changes the measurement plane.

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