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QPSK Modulation & Demodulation SB-221
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Product Category : Digital Communication Lab Trainer (Series : 200-B)Product Name : QPSK Modulation & Demodulation Model No. : SB-221 Product Details QPSK Modulation: This circuit has two bit Data Splitter, two Balance modulators wired using IC 1496, 900 RC Phase shift networks and OP-AMP IC 741 as summing amplifier. The 8 bit digital data input with clock input is applied to Data bit splitter network to split the data into pairs, which is then applied as an inputs to separate balanced modulators with direct and 900carrier input to provide balance modulator outputs which after summing network provides QPSK modulated data output. on board 8 bit digital Data generator, Clock input, Sine wave carrier signal generators (1No) with variable frequency upto 100KHz and 10Vpp amplitude. facility to change the digital data input bits, and carrier input. four phases output 00,900,1800,2700, for data inputs 00,01,11,10 respectively. Maximum carrier frequency 50KHz, sampling pulse output, Discrete level circuit. QPSK Demodulation: This circuit is wired with two mixers, 900 RC Phase shifter, two wave shaping networks, logical decision device circuit and OP-Amps to form QPSK Demodulation circuit to provide the demodulated serial data output with minimum noise for the applied QPSK input signal. Four phase QPSK input, Digital Data input 8 bit, sampling pulse input, maximum carrier input frequency 50KHz, QPSK detector bandwidth upto 2KHz, Discrete level circuit, Built-in fixed DC ±12V/+5V/1A Power supply and maximum test point. Objectives : To Study the Quadrature Phase Shift Keying (QPSK) Modulation. To observe & note the change in QPSK O/P w.r.t. the change in digital Data I/P. To observe & note the change in QPSK O/P w.r.t. the change in Carrier I/P. To Study the Quadrature Phase Shift Keying (QPSK) Demodulation. To observe the note demodulated O/P w.r.t. change in modulating digital Data I/P. To observe and note the change in the O/P w.r.t. change in carrier I/P. To observe and note the distortion/error in O/P w.r.t change in applied digital data I/P. Accessories Included : Set of Patch Cords, Operating Manual.
