User Guide

Nokia Customer Care Antenna Description and Troubleshooting

2115i/2116/2116i (RH-66)

Testing the GPS Antenna (2115i/2116i)

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

Use the following steps as a measurement procedure for the GPS Antenna:

1. Place the mobile terminal in the MJF-28 Docking Station Adapter with the

display facing 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.

Table 2: GPS Antenna Measurement Test Limits

Min Nominal Max

31,0 dBHz 35,0 dBHz 38,5 dBHz