ST2115
Scientech Technologies Pvt. Ltd.
35
Procedure:
1.
Before making connections, make sure that power supply is switched off.
2.
Refer to the above figure 2.1 while making connections.
3.
Connect the output of binary data generator to the input of unipolar to bipolar
converter.
4.
Connect the output of this converter to the modulating signal input of BPSK
modulator.
5.
Connect sinusoidal carrier from the carrier generator section to the carrier
input of BPSK modulator.
6.
Turn data switches of binary data generator to ‘1’ or ‘0’ as per your choice of
8 bit Binary data pattern. This binary data generator will then repeat this
sequence continuously.
7.
Now switch ‘On’ the power supply and observe the output of Binary Data
Generator on the CRO screen. If data is not appearing then press load push
button to reset it. Adjust the time base so as to see the complete repetitive
binary data. Every bit in this sequence repeats itself after 8 consecutive bits.
8.
Observe the output of BPSK modulator on CRO. This is BPSK modulated
Waveform.
9.
Now connect the output of BPSK modulator to the input of BPSK
Demodulator. Connect the output of low-pass filter of BPSK Demodulator to
the comparator input.
10.
Now observe the output of comparator on CRO. Adjust the bias of comparator
and phase of Carrier Recovery circuit of demodulator until you see a complete
replica of the input binary data. This is our demodulated signal. It may so
happen sometime that the recovered output is an inverted replica of input
signal. If such an output comes then readjust the phase of recovered carrier to
obtain the correct waveform.
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Содержание ST2115
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