Data Acquisition Mj-21 - Nokia RH-47 Series Rf Description And Troubleshooting

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RH-47

7 - RF Description and Troubleshooting

placed in the MJ-21 which is connected via Fbus to the Phoenix PC.

The phone is in local mode and VCC = 3.6V

The attenuation values for all components are known:

MJ-21:

•

0.2dB (850)

•

0.6 dB (1900)

Cable (in this case):

• 6.9dB (850)

• 7.8dB (1900)

Note that attenuation values are equal for all channels on each band.

Data acquisition MJ-21

The following data must be measured in the MJ-21 jig:

• TX power on MID channel (GSM850 PCL=5, GSM1900 PCL=0)

• RX RSSI level on LOW channel (GSM850, GSM1900)

• RX RSSI level on MID channel (GSM850, GSM1900)

• RX RSSI level on HIGH channel (GSM850, GSM1900)

The attenuation values of the cables (incl. power splitter when used) and the MJ-21 jig

must be taken into account when measuring the data.

The measurement is done in local mode.

TX power is measured in the Zero Span mode with RBW being 3MHz or more. The RBW

value also depends on the RF analyser used.

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