Testing Gps Antenna; Calibration Factor For Gps; Measurement Procedure For Gps Antenna - Nokia RH-3 Series Troubleshooting - Antenna

RH-3
Troubleshooting — Antenna
2 The phone's transmitter will be turned on at PCS band on CDMA mode channel
1175 at maximum output power (nominal 23 dBm at RF connector).
3 Measure the RF power with CPL-8 coupler. This will represent the internal
antenna to RF coupler measurement.
4 Turn the phone's transmitter off.
5 CDMA antenna test fails measured power is outside test limits
Min
Measured power + coupler, cable
and attenuator path loss
20,0 dBm
Testing GPS Antenna (Models 2285 and 2270)

Calibration Factor for GPS

GPS test mode 3: GPS receiver will be fed with CW signal. With -110 dBm signal level on
RF connector [(-110 dBm + cable loss) at signal generator output] GPS receiver should
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 14...17 dB. If 10 dB attenuator and cable with
1 dB loss is used total path loss is 25...28 dB. Signal level at generator output has to be
-85...-82 dBm [-110 dBm -(-25 dB...-28 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 The phone will be placed display up in the test adapter MJF-28 with whip
retracted.
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.
4 GPS Antenna test fails if C/No value is outside test limits
Min
31,0 dBHz
Page 16
Nominal
23 dBm
Nominal
35,0 dBHz
Nokia Corporation
CCS Technical Documentation
Max
Measured power + coupler, cable
and attenuator path loss
26,0 dBm
Max
38,5 dBHz
Confidential Issue 1 06/2003