Gps Rf General Checking - Nokia RH-3 Series Troubleshooting - Gps

RH-3
Troubleshooting — GPS

GPS RF General Checking

The fastest way to get an overview of GPS RF status is to run GPS QUICK TEST. This can
be done by using a CW signal generator and Phoenix. When running Galvanic testing, set
signal generator frequency to 1575.520152 MHz and adjust level to -110 dBm at GPS
antenna port. In radiated testing CW level has to be higher, because of the attenuation in
pad + cable + coupler. With -20 dB pad signal level in signal generator is ~ -110 dBm +
cable attenuation + 20 dB + 18 dB.
The CW analysis is functionality has been added to the GPS to allow end-to-end spectral
purity to be assessed during manufacturing and development.
1 Power cycle transceiver under test
2 Connect CW signal as stated above via GPS RF connector
3 Connect DAU-9T cable to Tomahawk connector
4 On Phoenix, choose connection as FBUS and select File/Scan Product
5 Select Troubleshooting/GPS Testing/GPS Quick Test/Test Mode Galvanic
in Phoenix
6 Execute (see the following diagrams for reference)
Page 18
Nokia Corporation
CCS Technical Documentation
Confidential Issue 1 06/2003