In digital communication data formatting is very important. The available data stream from PCM transmitter is converted into different formats best suited to individual transmission system. Various formats are covered in this trainer. Also to transmit the digital information the digital information carrier modulation is necessary. Various modulation techniques are also covered in this trainer.
This trainer requires TDM pulse modulation transmitter trainer for input of the digital data.
Features :
► On – board carrier generation circuit ( sine wave synchronized to transmitted data ).
► On – board inphase and quadrature phase carrier for QPSK modulation.
► Different data conditioning formats NRZ ( L ), NRZ ( M ), RZ, Biphase ( Manchester ), Biphase ( Mark ), MAI, RB Differentially encoded dibit pair.
► FSK, PSK, ASK & QPSK carrier modulation.
► Variable carrier and modulation offset.
► Variable carrier gain.
► On – board unipolar to bipolar conversion.
► On – board data inverter.
Technical Specification
1. Input : Two channel time division multiplexed data.
2. Data formats : NRZ ( L ), NRZ ( M ), RZ, Biphase ( Manchester ), Biphase ( Mark ), MAI, RB Differentially encoded dibit pair.
3. Carrier Modulation : FSK, PSK, ASK & QPSK carrier modulation.
4. On – board : Sinewaves synchronized to transmitted data at 1.44 MHz 960 KHz (00 phase) 960 KHz (900 phase)
6. Test Points : 38.
7. Interconnections : 4 mm sockets.
10. Power : 230V + 10% 50 Hz.
11. Accessories : a. Manuals
b. Set of patch cords.
c. Line cord.
Experiment that can be performed :
1. Study of conversion of NRZ ( L ), NRZ ( M ), RZ, Biphase ( Manchester ), Biphase ( Mark ), MAI, RB Differentially encoded dibit pair.
2. Study of following carrier modulation techniques and their comparison ASK, FSK, PSK & QPSK.