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Bell 103
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==Applications== Bell 103 modulation is still in use today, in [[shortwave radio]], [[amateur radio]], and some commercial applications. Its low [[data signaling rate|signalling speed]] and use of audio frequencies makes it suitable for noisy or unreliable narrowband links. One example is the [[CHU (callsign)|CHU]] shortwave station in [[Ontario]], Canada which transmits a Bell 103-compatible digital time code every minute. Bell 103 modulation is also the standard for amateur [[packet radio]] in the [[High frequency|HF]] (shortwave) bands.
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