Testing Cdma Antenna; Testing Gps Antenna - Nokia NPD-4 Series Troubleshooting - Antennas

CCS Technical Documentation

Testing CDMA Antenna

Calibration Factors
Defining AMS RF coupler CPL-11 calibration numbers will be conducted in the test
adapter MJF-19. The calibration numbers will be obtained by utilizing a phone with
known RF and antenna performance. Each test adapter should only require a single cali-
bration on CELL800 and GPS bands at used test frequencies. Additional calibrations
should only be needed if the test adapter is substantially modified (reassembled, changed
parts, dropped etc.).
Calibration Factor for CELL800 frequency
Transmitter of the phone with known output power and antenna performance will be
turned on at the maximum output power (all bits up) by using call box. The transmitted
power will be measured on the RF connector and through coupler at CDMA channel 384.
The difference between the transmitted and received powers will be used as the calibra-
tion number (path loss on CELL band including coupler, cable and attenuator path losses)
for the coupler on CELL band.
Nominal value for power measured at RF connector is 25,2 dBm. Coupler path loss is
normally ~10...11 dB at CELL band. If 10 dB attenuator and cable with ~1 dB loss is used,
total path loss is 21...22 dB and measured power would be from 4.2 to 3.2 dBm
[25,2dBm – (21...22 dB)]. However, path loss has to be measured separately for every
coupler since path losses vary depending on used setup, cables and attenuator.
Measurement Procedure for CELL800/PCS1900 phones
1 Place the phone display up with the whip antenna retracted in the test adapter
MJF-11.
2 Turn on the phone's transmitter at CELL band on CDMA mode channel 384 at
maximum output power (nominal 25.2 dBm at RF connector).
3 Measure the RF power with CPL-11 coupler. This will represent the internal
antenna to RF coupler measurement.
4 Turn the phone's transmitter off.
CDMA Antenna test fails measured power is outside test limits
Min (measured power + coupler,
cable and attenuator path loss)
22,0 dBm

Testing GPS Antenna

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
Issue 1 02/2003
Nominal
25,2 dBm
Nokia Corporation
Troubleshooting — Antennas
Max (measured power + coupler,
cable and attenuator path loss)
28,0 dBm
Confidential
NPD-4
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