Antenna Switch (Tx/Rx Switch); Gsm850 Transmitter; General Instructions For Gsm850 Tx Troubleshooting - Nokia RH-47 Series Rf Description And Troubleshooting

RH-47
7 - RF Description and Troubleshooting

Antenna switch (TX/RX switch)

The antenna switch operates as a diplexer for the RX and TX signals. Moreover, it sup-
presses the TX harmonics generated by the PA. The antenna switch is controlled by the
Mjoelner RF ASIC using the control signals VC1 and VC2.
The following table shows the possible different states.
VC1 [Volt]
0
0
2.7

GSM850 transmitter

General instructions for GSM850 TX troubleshooting

Start the preparations as described in chapter General instructions for TX troubleshoot-
ing "General instructions for TX troubleshooting".
1 Set operating mode to local mode.
Select
Wait until the RF Controls window pops up.
2 In the RF Controls window:
Select
Page 28
Company Confidential
Table 1:
Logic table for the antenna switching states
VC2 [Volt] GSM RX
0 X
2.7
0
Maintenance Testing
Band
Active unit
Operation mode
RX/TX Channel
TX Power Level
TX Data Type
Copyright © 2004 Nokia Corporation
Company Confidential
Nokia Customer Care
PCS RX GSM TX PCS TX
X
X
X
RF Controls
GSM850
TX
Burst
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Issue 1 05/04