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APMxxxx Series User's Manual
CALIBRATION CONFIRMATION
With the antenna system connected, and the R&S sensor still in-line, select "Service Mode" on the APM GUI menu
1.
(screen shot on the next page).
2.
At the top left of the GUI screen, select the appropriate TX Port and Channel from the drop down menus.
At the lower portion of the screen, click on "Start". This will "lock" the APM onto the selected channel and begin
3.
sampling the forward and reflected power levels.
4.
Key the repeater and compare the forward and reflected power readings with those measured by the R&S meter.
The readings should correlate closely. If so, the calibration has been confirmed.
De-key the station and click "Stop" at the bottom of the APM screen.
5.
From the GUI menu, click on "Calibration" and select the appropriate TX Port.
6.
7.
Enter the antenna feeder loss in the upper portion of the screen, below the coupler loss values and then click
"Apply".
The APM will now display SWR at the antenna rather than at the "Cabinet Tx Out" port.
8.
In the future, if the SWR at the "Cabinet Tx Out" port needs to be measured, simply change the feedline loss to 0.0 dB,
Note:
click "Apply" and then make the measurement. Before leaving the site, return the feedline loss to the previous value
and click "Apply" again.
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