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October 2nd 07, 12:26 PM
posted to rec.audio.tech,rec.audio.car,rec.radio.shortwave,ba.broadcast
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HOW DRM handles skywave propagation (digital radio mondiale)
On Oct 1, 1:42 pm, Ratata wrote:
wrote: "To counter the effects of Doppler shift and Doppler spread the frequency separation between the OFDM carriers in the DRM signal is progressively increased (e.g. the carrier spacing in Mode D is more than 2.5 times that in Mode A). This ensures that the frequency spread experienced is kept to a sufficiently small fraction of the carrier spacing to allow correct demodulation." better than IBOC ?? Digital Radio Mondiale *is* IBOC. (Like HD Radio, it sits right next- door to the AM signal, widening the channel by a few more kilohertz) |
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