LAN Trainer 7541

Categories: Advance Communication ( series 75XX )




The QAM/DQAM Modulation Trainer helps the student to learn the concepts in QAM/DQAM generation and its application. The circuit comprises of a Carrier sine wave generator, a NRZ L data generator, Clock and data generator, QAM/DQAM Modulator Circuit and the required power supply. The circuit is housed in an elegant cabinet with a well spread intelligently designed circuit layout on the front panel and is strongly supported by a comprehensive instruction manual.




♦        Carrier Sine Wave Generator                  :           Four carrier sine waves Generated onboard

Provides synchronized Sine waveform output of 500KHz (0 deg.), 500KHz (90 deg.), 500KHz(180 deg.),500KHz(270 deg.).

♦         Clock and Data Generator                      :           – 24 bit variable NRZ-L pattern generated

depending on the position of the three nos. of 8-dit Data Switch provided Clock Frequency is of 250 KHz.

♦         Data Format ( Coding )                          :           Non Return to Zero – Level ( NRZ-L ) Tribit encoded

data (I ,Q & C) Differential Encoded I & Q Bits.

♦         Carrier Modulation Techniques               :           Quadrature Amplitude Modulation, Differentially

Quadrature Amplitude Modulation.

♦         Switch Faults                                        :           4 Nos.

♦         Power Supply                                       :           ± 5V and ± 12V.

♦         Test Points                                           :           Provided at various stages in the circuit to observe

the voltages and waveforms.

♦         Interconnections                                    :           4 mm terminals are provided.

♦         Accessories                                          :                    Set of 4 mm patchcords.

Instruction Manual.




♦         To Study the Elements of 8-QAM / DQAM system.

♦         Tribit Coding Technique of NRZ-L data format.

♦         Differential Encoding of Data.

♦         8-QAM Modulation technique.

♦         DQAM Modulation technique.

♦         To study of constellation Diagram of QAM.

♦         To study bandwidth efficiency in QAM techniques.

♦         Effect of Switch faults.


Specifications Are Subject To Change Due To Constant

Developments Without Any Prior Notice