cwt
Joined: 26 May 2004
Posts: 80
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 06 May 2006 11:27 FSK modulator/demodulator |
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Hi,
I had xr2206 as fsk modulator and xr2211 as fsk demodulator. My logic 0 = 2kHz and logic 1 = 5kHz. I had already put all the components base on my design.
But there are some doubts.
1. How should the modulator and demodulator being tested properly? Is it connecting the xr2206 output to xr2211 input through a wire or connecting wirelessly? I had use a function generator to test the demodulation and it works fine. But is there any way to test both the circuit wirelessly?
2. Is the output of xr2211 demodulator an invert of the TTL logic? For frequency < 3.2kHz i get HIGH (4.75V) and for frequency > 3.2kHz i get LOW (0.045V). By right i should obtained HIGH for freq > 3.2kHz and LOW for freq < 3.2kHz.
Please advice me. Thanks.
Regards,
cwt
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