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APMxxxx Series User's Manual
5.
Key the base station and note the Forward power and VSWR. The VSWR should be low with the load attached.
6.
De-Key the station and connect the antenna system.
7.
Repeat Step 5 noting that the VSWR may be a bit higher with the antenna attached.
Return to the "Calibration" menu, enter the Feed Line loss into the "Antenna Feeder" field and then click "Apply".
8.
The APM will now display the VSWR calculated at the antenna rather than the base of the feedline. If you prefer
the APM to measure the VSWR at the bottom of the feed line (output port of the coupler), leave the feed line loss
at 0 dB.
Repeat the above verification for a channel within each of the active "TX Ports"
9.
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