Nokia NME-2A Series - Tuning Steps; RSSI Reference Signal Level Storage; AFC Diagram Storage

P.A.M.S.
Technical Documentation
NME–2A
Tuning Instructions
Page 10
Issue 2 05/2000
Tuning Steps
1. RSSI Reference Signal Level Storage
Reference value for the received signal strength meter are program tuned.
RSSI reference signal level programming:
– Start the service software and go to ”Main” menu.
– Select ”Phone mode” and select local mode with
Enter key.
– Select ”Testing and Adjustments” menu and press
Enter .
– Select ”Adjustments” menu and press
Enter .
– Connect RF generator to antenna connector at 947.06771 MHz.
– Adjust signal generator level to –57 dBm + cable attenuation.
– Select ”RSSI Calibration” and press
Enter .
– RSSI offset value should be within 37...49 dB.
– AGC calibration values (Compensation Term) should be
below ±2.0dB.
– Press
Esc key.
– Store the value to the EEPROM with
Y key.
2. AFC Diagram Storage
This tuning is used to calibrate the automatic frequency control range.
AFC tuning:
– Set RF generator frequency 947.06771 MHz at level –57 dBm.
– Select adjustments menu option ”AFC Diagram” and press
Enter
– Check that ” Cont mode channel” is 60
– The measurement result should be;
• Low over –22 kHz (< –10 kHz)
• Middle ±1.5 kHz (depends on generator frequency accuracy)
• High below +22 kHz (> 10 kHz)
– Press
Esc key and store with Y key.