174 Part H: Diagnosing © Tait Electronics Limited December 2007This test lets you see what signals are out there; it does not determine thereceiver’s sensitivity.To measure signal levels1. Select Diagnose > Reciter > Signal Level.2. In the Center frequency box, specify the middle frequency of the bandyou want to test. This can be any frequency within the receiver’s switchingrange.3. In the Channel spacing box, select a value from the drop-down list. Thisspecifies the size of the step from one frequency to the next. If thiscorresponds to the channel spacing, you will measure signal levels of thedifferent channels in the band.4. Under Peak hold, select On if you want the display to show the strongestsignal received on any pass.This means signals from infrequent users aremore likely to be included. Select Off if you want to see only the results ofthe most recent pass.5. On the toolbar, click Standby.6. Click Start Test. The base station sets the receiver to a frequency, measuresthe RSSI, increments the frequency by the value in the Channel spacingbox, measures its RSSI and so on for 101 steps below and above the centerfrequency you specified. If a frequency lies outside the receiver’s lock range,its RSSI is not displayed.The graph displays the measured RSSI values and annotates the x-axis withthe correct frequency values.Determining Synthesiser Lock RangesYou can test the reciter’s synthesisers to determine the range of frequencies thatthe receiver and the exciter can operate on. Use these tests to check that thereciter is calibrated correctly for the channels that it will operate on.The Clock source box indicates whether the reference frequency is internalor external to the base station.The bottom group of boxes with LEDs indicate the lock status of various partsof the reciter in its current operation.To test the exciter or receiver lock range1. Select Diagnose > Reciter > Synthesisers.2. Click Start Test in the exciter or receiver row.The exciter or receiver checks all the channel frequencies in the band thatthe base station is type-approved to operate in.
