Is a much lower frequency required if used in DRM FM? – Your Question Answered

June 26, 2023

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I read that a much lower frequency offset is required if used in DRM FM. Can you explain why?

(Bangalore student)

In India, between two analogue FM transmitters (i.e., 600 kHz frequency gap) a centre-to-centre spacing of 800 kHz is kept (i.e., 600 kHz frequency gap)as FM requires 200kHz spectrum. But a DRM digital transmitter can be installed at a spacing of only a 50 kHz frequency gap from an analogue FM transmission and/or another digital transmitter. Thus, DRM digital permits the operation of much more FM-band radio services, which in any case would be required particularly in major cities where the available spectrum is limited. DRM in FM only uses half the bandwidth of analogue (100kHz) and can deliver using this spectrum up to 3 audio service and one data channel.
Coupled with energy saving of up to 90% for delivering the same coverage, it becomes obvious why DRM is such a great option for FM public, commercial or community stations.

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