Continuity Test - Nokia NPD-4 Series Troubleshooting - Antennas

NPD-4
Troubleshooting — Antennas
report C/No ratio of 35 dBHz. Reported C/No figure will be recorded with signal fed to RF
connector. C/No value will be read with coupler engaged. GPS signal level must be
increased until same C/No value is recorded. The difference between the CW signal levels
at the generator will be used as the calibration number (Path loss on GPS band including
coupler, cable and attenuator losses).
Nominal coupler path loss at GPS band is 17...18 dB. If 10 dB attenuator and cable with
1 dB loss is used total path loss is 28...29 dB. Signal level at generator output has to be –
82...-81 dBm [-110 dBm –(-28 dB...-29 dB)]. However path loss has to be measured sep-
arately for every coupler since path losses vary depending on used setup, cables and
attenuator.
Measurement Procedure for GPS antenna
1 Place the phone with the whip antenna retracted onto the test adapter MJF-19
with CPL-11 antenna coupler and place inside shield box.
2 CW Signal generator will be turned on [with power -110 dBm + coupler, cable
and attenuator path loss at GPS band] fed to RF coupler.
3 Read reported C/No figure with test mode 3 three to four times to see if it is sta-
ble.
GPS Antenna test fails if C/No value is outside test limits

Continuity Test

Both antennas must be tested if antenna ground pin is touching PWB ground. Test will
be conducted with multimeter capable of measuring continuity or resistance. Test there
is 0 Ω resistance between Internal antenna and Battery ground clip. Make same test
between GPS antenna and Battery ground clip. If there is no contact to ground, check
antenna contacts.
Page 10
Min Nominal
31,0 dBHz 35,0 dBHz
Nokia Corporation
CCS Technical Documentation
Max
38,5 dBHz
Confidential Issue 1 02/2003