Tuning Steps; Afc Tuning; Vctcxo Tuning - Nokia NSW-6 Series Technical Documentation Manual

PAMS Technical Documentation

Tuning Steps

Note About Supply voltage.
The Service battery (Flash adapter) FLA–9 used for NSW–6 differs from
the standard DCT3–Service battery. The max. supply voltage is 16 V.

1. AFC Tuning

This tuning adjusts the frequency of the reference oscillator so that the
frequency criteria of the network will be met.
This adjustment loads the analog center frequency offset DAC value into
the EEPROM. When doing this, a spectrum analyzer must be used.
Note: Do not leave a tuning session on. The analog transmitting takes maximum
current. A prolonged tuning session may damage the phone or service battery. The
service battery will be heated.
The spectrum analyzer settings are shown in the AFC tuning window.
– – Set the power supply voltage. See instructions above.
– – Connect the spectrum analyzer to the antenna adapter or to the
diagnostic jig.
– – Check that the spectrum analyzer center frequency is correct.
– – Tune the center frequency 832.500 MHz +/– 200 Hz.
– – Once the center frequency is correct, press OK button.

2. VCTCXO Tuning

This tuning is to check that the radio unit has correct adjustment to meet
the network criteria for frequency stability.
This adjustment loads the VCTCXO offset DAC value into the EEPROM.
RF signal generator must be used in tuning.
– –Set the power supply voltage. See instructions above.
– –Connect the RF signal generator to the antenna adapter or to the
diagnostic jig JBS–25.
– –Once the RF signal generator frequency is correct, press Meas but-
ton.
– –Set the correct RF level to the signal generator.
– –Remember to note the attenuation at RF signal level !
– –Once the frequency and RF level are correct, press OK button.
Issue 1 12/99
Tuning, Flashing and NAM programming instructions
E Nokia Mobile Phones Ltd.
NSW-6
Page 9