Tx Path Of The Transmitted Egsm900 Signal - Nokia 616 Service Manual

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The setup should now look like this:
Step 2: Doing the Measurement
Now the measurement equipment should measure the following output signal from the
phone:
P = +23dBm @ 897.4MHz
out
If this is not the case, then go to the TX Troubleshooting section of this document for
troubleshooting.

TX path of the transmitted EGSM900 signal

The components can be grouped into blocks and drawn as shown below. Note that the
picture shows both EGSM900 transmitter (lower) and GSM1800 transmitter (upper).
GSM
Dir. Coupler
TX
PCN
TX
PCS
DET
VBATTRF
Issue 2.0 Mar/2005
Company Confidential
VANTL / VANTM / VANTH
3
VB_DET
VTXLOL
VTXLOH
VTXBH
VTXBL
PCN/PCS
OUTHP
Balun
OUTHM
PA
VTX
SAW
Buffer
OUTLP
OUTLM
EGSM
DET
PW-
PLFB1
loop
PLFB2
filter
VPCH/VPCL
PA_IDENT
Copyright © 2005 Nokia Corporation.
Company Confidential
TF4 Technical Information
VDDDIG
RF
Controls
1/2
VDDRXBB
RF
Controls
2
Open
collector
Open
collector
PWC
2
Supply
filter
VR2
TXP TXC
TFE-4/RV-1
1/4
2 2 2
Mjølner
2 2
Page 8b-55