Digital Radio Mondiale (DRM) has long been touted as the digital replacement for AM radio on the medium and short wave bands. Despite years of trials, it has yet to make a real breakthrough.
Revision 4 of the latest DRM Handbook is now available as a PDF document HERE
A lot of what is in the handbook is aspirational and is unlikely to ever happen. However, there was a section of interest about the 26 MHz band and Band 1 from 47 to 68 MHz.
10.3.2 26 MHz band
DRM is the only digital broadcasting system designed to operate in the shortwave bands (broadcast allocations within 3 – 30 MHz). The “26 MHz band” (25.67 to 26.1 MHz) is a 430 kHz wide broadcasting service allocation at the upper end of the HF range, providing forty-two 10 kHz (or 21 x 20 kHz) channels.
10.3.3 Band I (47 – 68 MHz)
The frequency range between 47 – 68 MHz has mainly been used by analogue television. Consequently, DRM+ could in principle be introduced in Band I. At the present time, no regulatory framework exists for the introduction of DRM+ and it should be noted that in some countries there are other services in operation.
Services in this Band are particularly subject to long distance interference (Sporadic E) at certain times of the year and therefore Band I is more suitable for the provision of local services where the wanted signal can be relatively high.
Links...
1) Wikipedia - https://en.wikipedia.org/wiki/Digital_Radio_Mondiale
No comments:
Post a Comment