Testing Gps Antenna (6015I/6016I/6019I); Calibration Factor For Gps; Measurement Procedure For Gps Antenna - Nokia 6015 Troubleshooting - Antenna
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- User manual (87 pages) ,
- Troubleshooting - rf (68 pages) ,
- Disassembly/assembly (18 pages)
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Testing GPS Antenna (6015i/6016i/6019i)
Calibration Factor for GPS
In GPS test mode 3, the GPS receiver is fed with a CW signal. The GPS receiver should
report C/No ratio of 35 dBHz with a -110 dBm signal level on the RF connector
(-110 dBm + cable loss) at signal generator output. The reported C/No figure is recorded
with the signal fed to the RF connector. The C/No value is read with a coupler engaged.
Increase the GPS signal level until the same C/No value is recorded. Use the difference
between the CW signal levels at the generator as the calibration number (path loss on
GPS band including coupler, cable, and attenuator losses).
The nominal coupler path loss at GPS band is 14 to 17 dB. If you use a 10 dB attenuator
and cable with 1 dB loss, the total path loss is 25 to 28 dB. The signal level at generator
output must be -85 to -82 dBm [-110 dBm -(-25 dB to -28 dB)]. However, the path loss
has to be measured separately for every coupler because the path losses vary depending
on the setup, cables, and attenuator.
Measurement Procedure for GPS Antenna
1. Place the phone in the test adapter (MJF-28) with the display up and the whip
retracted.
2. Turn on the CW signal generator [with power -110 dBm + coupler, cable, and
attenuator path loss at GPS band] fed to the RF coupler.
3. Read the reported C/No figure with the test mode 3 three to four times to see if
it is stable.
The GPS antenna test fails if the C/No value is outside the test limits.
Min
31,0 dBHz
Issue 1 08/2004
6015/6015i/6016i/6019i (RH-55), 6012 (RM-20)
Table 2: GPS Antenna Measurement Test Limits
Nominal
35,0 dBHz
©2004 Nokia Corporation
Troubleshooting — Antenna
Max
38,5 dBHz
Company Confidential
Page 15
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