Sharp GX15 Service Manual page 40

GX15
4) RSSI Measure
The handset (phone) notifies you of input power value at the aerial connector.
Estimated Power
input box
(Integer only)
[Procedure]
1. Connect the handset (phone) and GSM tester (or Signal Generator) with RF cable.
2. Select a band and channel. [see 4.6.3.1)]
3. Send signals (*) from GSM tester.
4. Enter the value of input power from GSM tester in integers (from –10 to –110) considering RF cable loss.
5. Press the "Measure" button.
6. The result appears in Measured Power box.
* The signal type from GSM tester must be either of the following:
1. Continuous sine wave (without modulation) with the following frequency.
(Frequency of the measured channel) + 67.708 kHz
(e.g. channel: GSM 37ch → the result: 942.467708 MHz)
Power: –110 to –10 dBm
2. BCCH signal of the measured channel
Power: –110 to –10 dBm
Result
When the handset (phone) is properly calibrated, the error between "Estimated Power" and "Measured Power" is less than 3 dB.
4.6.4 Termination
Turn off the handset (phone) to ensure proper operations.
4.6.5 Trouble information
When switching DCS and PCS, change the channel number as well. Or the band does not change properly.
Example: If you change DCS 512 CH to PCS 512 CH, the band remains DCS.
CONFIDENTIAL
Measure button
Figure 60
2 – 32
Measured Power box