TB8100 Service Kit User’s Manual Reciter Tests 153To 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. 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.When the test is complete, the graph displays the measured RSSI values andannotates the x-axis with the 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.3. In the Lower Frequency and Upper Frequency boxes, view the resultsof the test. These values report the range within which the synthesiser is ableto lock onto the specified frequency.Note: The reported ranges are conservative. In fact, the base stationwill be able to transmit and receive outside the range, but withreduced transmit output and receive sensitivity.4. Click Stop Test. The exciter and receiver frequencies revert to what theywere when you started the test.
