Sharp GX20 Service Manual - Page 40

RX test

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GX20 CONFIDENTIAL GX20 TX power Table (Target power during calibration, supply voltage: 3.7[V]) GSM PCL 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 TX Power [dBm] 31.6 30.0 29.0 27.0 25.0 23.0 21.0 19.0 17.0 15.0 13.0 11.0 9.0 7.0 5.0 DCS/PCS PCL 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 3.3. RX test The phone receives burst signals in this test. TX Power [dBm] 28.6 27.0 26.0 24.0 22.0 20.0 18.0 16.0 14.0 12.0 10.0 8.0 6.0 4.0 2.0 0.0 RX frequency of selected channels Current RX Gain (Read only) RX Gain Setting bar RX ON/OFF button Sniff ON/OFF This indicator appears while receiving burst signals. [Procedure] 1. Select a channel and band. (see 3.1) 2. Select RX Gain using RX Gain Setting bar. 3. Choose Sniff ON or OFF. 4. Click RX ON to start receiving burst signals. 5. From GSM tester, send burst signals in the specified channel. (You can check each part in this state.) 6. Click RX OFF to end receiving burst signals. Figure 68 * In this test, the reception timing cannot be synchronized with burst signals from Signal Generator or GSM tester. * The standard RX Gain Setting is: (Input power at the antenna connector of the phone) + (RX Gain) = -16 dBm Excessive Input power or RX Gain may cause damage to the phone. 2 - 34

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GX20
2 – 34
CONFIDENTIAL
GX20 TX power Table
(Target power during calibration, supply voltage: 3.7[V])
3.3. RX test
The phone receives burst signals in this test.
Figure 68
[Procedure]
1.
Select a channel and band. (see 3.1)
2.
Select RX Gain using RX Gain Setting bar.
3.
Choose Sniff ON or OFF.
4.
Click RX ON to start receiving burst signals.
5.
From GSM tester, send burst signals in the specified channel.
(You can check each part in this state.)
6.
Click RX OFF to end receiving burst signals.
*
In this test, the reception timing cannot be synchronized with burst signals from Signal Generator or GSM tester.
*
The standard RX Gain Setting is:
(Input power at the antenna connector of the phone) + (RX Gain) = –16 dBm
Excessive Input power or RX Gain may cause damage to the phone.
GSM
DCS/PCS
PCL
TX Power [dBm]
PCL
TX Power [dBm]
5
31.6
0
28.6
6
30.0
1
27.0
7
29.0
2
26.0
8
27.0
3
24.0
9
25.0
4
22.0
10
23.0
5
20.0
11
21.0
6
18.0
12
19.0
7
16.0
13
17.0
8
14.0
14
15.0
9
12.0
15
13.0
10
10.0
16
11.0
11
8.0
17
9.0
12
6.0
18
7.0
13
4.0
19
5.0
14
2.0
15
0.0
RX Gain Setting bar
RX frequency of selected channels
Current RX Gain (Read only)
RX ON/OFF button
This indicator appears while
receiving burst signals.
Sniff ON/OFF