User Guide

TUNING INSTRUCTIONS
9618ARo
6–3–3
NHC–4
Technical Documentation
Copyright  Nokia Mobile Phones
Required Equipment
– PC/AT computer with the Service software; see Sect. 5 for intructions on
installation and use.
– M2BUS adapter DAU–2 and other service accessories; see equipment set-
up pictures.
– Audio analyzer
– Spectrum analyzer
– RF power meter, power measurement sensitivity –10 dBm.
– Modulation analyzer with precise frequency measurement.
– RF generator
– Device to provide specified testmodulation to modulate RF generator.
– DMR tester
– Multimeter or DVM.
– Attenuator and branching unit.
– Power supply 1, nom. voltage 12 V.
– Power supply 2, nom. voltage 6 V. This is needed only in that case, if you
want to connect the dummy battery direct to the to power supply.
Accuracy of the Equipment During Measurement
– Power supply 1; nominal voltage 12 ±0.5 V current cap. min. 1.5 A for ser-
vice box (JBS–7). If you test or tune also the RF booster BSH–4, you need
power supply, which has 5 A output capacity.
– Power supply 2 ;nominal voltage 6.0 ±0.1 V, current cap. min. 1.5 A.
– Mod. analyzer power level resolution 0.1 dB, accuracy ±0.5 dB. Frequency
counter accuracy 0.1 ppm 〈±80 Hz).
– RF generator; frequency res. 10 Hz amplitude res. 0.1 dB frequency stab.
±0.25 ppm.
– Spectrum analyzer; dynamic range 70 dB, accuracy ±1 dB (For power level
measurement accuracy ±0.5 dB).