User Guide

CC Technical Documentation Troubleshooting - RF

NPM-10 (3595)

RF Troubleshooting

Abbreviations in Troubleshooting Charts

Introduction

Two types of measurements are used in this chapter. It will be specified if the measure-

ment type is RF or LF.

• Use a spectrum analyzer with a high impedance probe for RF measurements.

Also, it is recommended that you use a good phone as a benchmark for the

measurement technique because signal levels can vary depending on the

measurement setup. Measurements stated in this section were done with an

HP85024 high-impedance probe.

Note: The test jigs have some losses which must be taken into consideration when calibrating

the test system.

• Use a 10:1 probe and an oscilloscope to measure the LF (low frequency) and DC

(direct current). The probe used in this chapter is an 10MΩ/8pF passive probe.

If using another probe, keep in mind that the voltages displayed may be slightly

different.

Table 1: Troubleshooting Abbreviations

Abbreviation Definition

BB Base band

DC Direct current

ESD Electrostatic discharge

FEM Front End Module

LF Low frequency

LO Local oscillator

LPF Low pass filter

PA Power amplifier

PLL Phase-locked loop

PWB Printed wiring board

RCT Radio communication tester

RF Radio Frequency

Rx Receiver

Tx Transmitter

UHF Ultra-high frequency

VCO Voltage-controlled oscillator