Sharp GX20 Service Manual - Page 41

Termination, Trouble imfomation

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CONFIDENTIAL 3.4. RSSI Measure The phone notifies you of input power value at the antenna connector. GX20 Estimated Power Input box (Integer only) Measured power box Measure button Figure 69 [Procedure] 1. Connect the phone and GSM tester (or Signal Generator) with RF cable. 2. Select a band and channel. (see 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 two: 1. Continuous sine wave (without modulation) with the frequency as follows: (Frequency of the measured channel) + 67.708kHz. (Ex. 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 phone is properly calibrated, the error between "Estimated Power" and "Measured Power" is less than 2dB. 4. Termination Turn off the phone to ensure proper operations. 5. Trouble imfomation 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. 2 - 35

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GX20
2 – 35
CONFIDENTIAL
3.4. RSSI Measure
The phone notifies you of input power value at the antenna connector.
Figure 69
[Procedure]
1.
Connect the phone and GSM tester (or Signal Generator) with RF cable.
2.
Select a band and channel. (see 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 two:
1. Continuous sine wave (without modulation) with the frequency as follows:
(Frequency of the measured channel) + 67.708kHz.
(Ex. 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 phone is properly calibrated, the error between “Estimated Power” and “Measured Power” is less than 2dB.
4. Termination
Turn off the phone to ensure proper operations.
5. Trouble imfomation
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.
Estimated Power
Input box
(Integer only)
Measure button
Measured power box