Receiver Troubleshooting; Front End Module (Fem) Control Signals; Renesa Fem Logic; Rfmd Fem Logic - Nokia RH-53 Troubleshooting Instructions
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Also See for RH-53:
- Instructions manual (218 pages) ,
- Manual (38 pages) ,
- Disassembly instructions manual (14 pages)
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RH-53/54
Receiver Troubleshooting
■
Front End Module (FEM) control signals
Depending on the vendor of the Front End Module (FEM), different timing of the control signals
are present. The SW suppoerts both FEMs. R629 tells the SW which FEM control should be
active. Renesas FEM control is used when R629 is 18K and RFMD FEM control is used when
R629 is 82K.
If the FEM is exchanged with an other type, the R629 must be changed, too.
Renesa FEM logic
Mode
Low Band RX
Low Band TX
High Band RX
High Band TX
RFMD FEM logic
Mode
Idle
Low Band RX
Low Band TX
High Band RX
High Band TX
ISSUE 1 09/2004
Table 5: Renesa FEM logic
Vtx
VTX_B_P
VTX_B_P
0
1
0
1
Table 6: RFMD FEM logic
Vtx
VTX_B_P
VTX_B_P
0
0
0
0
1
0
0
1
1
1
COMPANY CONFIDENTIAL
Copyright © 2004 Nokia. All Rights Reserved.
BS
VC1
Vant1
0
0
0
1
1
0
1
0
BS
VC1
Vant1
0
1
1
1
1
Nokia Customer Care
VC2
Vant2
0
0
0
1
VC2
Vant2
0
0
0
0
0
37
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