Fault Finding; Rf Waveforms - Panasonic EB-X70 Service Manual

FAULT FINDING

8 FAULT FINDING

8.1. RF Waveforms

NOTE:
When using a FET probe, it should be protected from high power levels via a 70 dB pad.
The measurements shown below are by FET probe on non-50 Ω tracks, therefore signal levels are approximate.
dBm
SMARTi O/P, single-ended measurement
0
1
-10
-20
-30
-40
-50
Start: 1.709200 GHz
The PA amplifies signals by ~30 dB.
dBm
PA I/P, single-ended measurement
1
3
-2
-7
-12
-17
-22
-27
-32
-37
-42
-47
Start: 1.709200 GHz
Stop: 1.711200 GHz
Issue 1
Revision 0
Stop: 1.711200 GHz
Figure 8.1: GSM 1800 / GSM 1900 Filter (FL606)
Figure 8.2: GSM 1800 / GSM 1900 Power Amplifier (U601)
Section 8
– 46 –
dBm
H3 Filter O/P, single-ended measurement
0
1
-10
-20
-30
-40
-50
Start: 1.709200 GHz
dBm
PA O/P, single-ended measurement
39
1
29
19
9
-1
-11
PMCD030901C8
Service Manual
Stop: 1.711200 GHz
10740-1
Start: 1.709200 GHz
Stop: 1.711200 GHz
10741-1