Measuring One Port Insertion Loss

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The one port insertion loss measurement allows you to quantify signal loss in a cable or other device without connecting both ends of the cable or device to the test set. This measurement can be especially useful in measuring the loss of a feedline connected to the antenna on a tower. This method of measuring antenna feedline insertion loss is accurate for results up to 10 dB.
This measurement is less accurate than Two Port Insertion Loss. When it is not practical to connect both ends of a device to the test set or for insertion loss measurements greater than 10 dB - for example when measuring a 40 dB high power attenuator - it is better to use Two Port Insertion Loss.

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NOTE:

The test signal emitted from the SWR port is a sine wave, swept from the starting frequency to the stop frequency. When testing cables that are attached to antennas, test signals are radiated, and these test signals can cause interference. Verify that the signal used for the test cannot cause interference to another antenna.

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