QAM and PCM Analyzers

GAO Tek provides a wide range of high performance and budget-friendly QAM/PCM analyzers. Quadrature amplitude modulation (QAM) and pulse code modulation (PCM) analyzers are convenient instruments with top to bottom estimations and adaptable setups. They integrate functions of analog signal generators/receivers, BERT, signaling generators/receivers, selective level meters, ring generators/ identifications, dialers, DC loop circuits (ICT, OGT), balanced bridges and reflecting bridges into solitary instruments. Quadrature amplitude modulation (QAM) testers are mainly designed to measure and analyze signal strength in the HFD networks (channel power, MER, BER, constellation diagram). With 20 years of experience, GAO Tek is proud to provide the ideal analyzers for installing and maintaining digital and analog networks.

Functions of QAM and PCM analyzers

Quadrature amplitude modulation (QAM) testers have functions to calculate PCM voice encoding and decoding performance characteristics and are widely utilized for measuring PCM devices, digital switches, carrier wave communication devices, and VoIP devices. The devices provide remote controls via USB or Ethernet interfaces which allow users to develop and design voice channel measurement/control systems under an assortment of various conditions. Quadrature amplitude modulation (QAM) testers can also compare the measured results with built-in standard ITU-T tolerance mask. Test results can be transferred to a PC where they can be further viewed, examined, assembled, and printed via the included software. Quadrature amplitude modulation (QAM) testers are specially designed for testing signal levels, quantizing distortions, idle channel noises, return losses, and longitudinal balance losses.


GAO Tek’s QAM analyzers highlight multi-task operations which allow users to test and browse previous test records simultaneously. Measurement results can be transferred to PCs via USB interfaces for analyzing, archiving, and printing. They also have built-in call set-up circuits which can set up testing channels directly by dialing on the testers without the help of other telephones. Moreover, quadrature amplitude modulation (QAM) testers also have built-in generators and receivers where analog input and output interfaces are separated into ICT and OGT. Interfaces can be directly tested, including 2/4W E&M, MDR, LGE, FXO, LGS, and FXS. Finally, QAM testers highlight built-in balanced bridges and reflecting bridges which measure return losses, longitudinal conversion losses and longitudinal conversion transfer losses.

Applications and Industries

The QAM/PCM channel analyzers are especially appropriate for installing and maintaining digital and analog networks. They also are widely used in applications such as digital cable broadcast test and monitoring, RF reception quality measurement, head end or field testing, R&D streams or signal analysis, digital cable troubleshooting, installation & maintenance test tool, portable demonstration setup, CATV signal measurement, scientific research, and analog signal measurement.

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