User's Manual

22 Calibrating the RSSI MB8100-90-00-806 © TEL 2004
Calibrating the RSSI
Calibrating the RSSI (received signal strength indicator) ensures that the
reciter's internal RSSI values accurately reflect the actual received signal
strength. Changing the receiver's lock band can alter the calibration accuracy by
about 1 dB.
Note: Ensure that the receiver’s lock band has already been adjusted
to the required setting before carrying out this procedure. (See
“Adjusting the Receiver Lock Band” on page 15.)
Equipment ■ RF signal source
Setup
To calibrate the RSSI
1. Ensure you are already connected to the reciter.
2. Select the Reciter Calibration tab, and double-click RSSI Calibration.
The RSSI Calibration Wizard appears.
3. Apply a signal (modulated at 1 kHz tone, 3kHz deviation peak) at the base
station’s center frequency. Use the CTU to confirm that the tone is being
output on the line, and then click Next.
4. Set the RF input signal to a level of -80 dBm, and then click Next.
5. Vary the RF level, and check that the value shown in the RSSI Gain Setting
box corresponds with the value shown on your test instrument. This is to
make sure the RSSI is correctly calibrated. Click Finish.
When you have finished calibrating the RSSI, the icon on the Reciter
Calibration tab indicates that this task is complete.
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2
1 RF signal source
2 Reciter