DIGITAL RADIO GUIDE

TERRESTRIAL TRANSMISSION SYSTEMS - ISSUES

4.5Issues related to Terrestrial Systems

4.5.1Spectrum Availability

Government policies on frequency management and spectrum pricing affect all radio broadcasting development. In some countries the radio spectrum is looked upon as a means of raising revenue.

Administrations in different countries operate different policies, but there are common threads. Whether frequencies are allocated through auctions or by other means, spectrum is undeniably a scarce resource and especially so in the bands that are most useful for digital audio broadcasting (including the existing shortwave bands, existing AM and FM bands, as well as the upper VHF and L-Bands).

In many countries administrations have allocated spectrum for digital broadcasting, both radio and TV.

The DRM system is designed to work within the existing band and channel structure for all the broadcasting bands below 30 MHz. As such, its use of the spectrum conforms to the Geneva Treaty of 1975 for ITU-R Regions 1 and 3, the long wave and medium wave channels have a 9 kHz bandwidth, or multiples thereof, depending on the channel assignment; the Rio Treaty of 1981 for Region 2 medium wave specifies a 10 kHz bandwidth; and the shortwave channel bandwidth is 10 kHz for all the HF broadcasting bands. Thus, no new spectrum is required. Furthermore, based upon ITU-R decisions during 2003, DRM signals can be used operationally in these bands, with the existing channel bandwidths, interspersed with the analogue broadcasts. That is, there are no specially allocated segments of bands for digital transmissions. Ongoing testing has verified the feasibility of this approach.

In the US, the government has approved HD Radio as a way to alleviate the need for new spectrum to implement terrestrial digital radio.

The constraints and uncertainties that cloud the issue of frequency allocations for new digital terrestrial services in the VHF and L-Bands are not such a problem for AM digital developments. There is some prospect that the congestion now in the AM bands could be reduced with digital broadcasting. Potentially, there is much to be gained from digital broadcasting in the short-wave bands because current analog systems require a number of simultaneous broadcasts to ensure reliable reception under changing ionospheric conditions.

Case Study: Allocations in Region 1

In the UK, where spectrum is being allocated for seven Eureka 147 DAB multiplexes, the granting of license has been in VHF Band III, which is very suitable for terrestrial DAB (T- DAB) transmissions. Across Europe, both VHF and L-Band frequencies will be used for T-DAB services. At a planning meeting held set up by the CEPT (European Conference of Postal and Telecommunications Administrations and held in Wiesbaden) in 1995, frequency blocks in three bands were considered:

•VHF Band I (47 – 68 MHz)

•VHF Band III (174-240 MHz)

•L-Band (1452 – 1467.5 MHz)

The Wiesbaden plan made allotments for digital audio broadcasting in VHF channels 11 and 12 and in the L-Band, and considered the implications of protecting non-DAB

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Grundig Digital Radio manual Issues related to Terrestrial Systems, Spectrum Availability, Case Study Allocations in Region
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Digital Radio specifications

The Grundig Digital Radio represents a significant advancement in radio technology, combining aesthetics, functionality, and a user-friendly interface. As a pioneer in the audio and electronics industry, Grundig has successfully integrated modern digital capabilities into its traditional radio design, appealing to both nostalgic listeners and tech-savvy users.

One of the standout features of the Grundig Digital Radio is its versatility in reception. With DAB+ (Digital Audio Broadcasting) technology, users can enjoy a wide array of radio stations with superior sound quality, free from the hiss and interference commonly associated with analog broadcasts. The inclusion of FM and AM bands ensures that listeners are not limited, providing access to local stations that may not yet have transitioned to digital.

The Grundig Digital Radio is designed with ease of use in mind. Its intuitive interface, often featuring a clear LCD display, allows users to navigate through stations and settings effortlessly. Many models also include a built-in tuner that automatically scans and presets available stations, simplifying the setup process. For those who appreciate personalization, some variants come equipped with customizable presets, allowing users to save their favorite stations for quick access.

Portability is another key characteristic of the Grundig Digital Radio. Many models are lightweight and come with built-in handles, making them ideal for on-the-go listening, whether it's in the garden, on the beach, or during a picnic. Battery options, alongside mains power, ensure that users can take advantage of their radios wherever they choose.

In terms of sound quality, Grundig utilizes advanced audio technologies to deliver rich and clear sound. Enhanced bass responses and treble controls allow users to fine-tune their listening experience to match their preferences. Furthermore, many models feature additional inputs, such as AUX and USB ports, enabling users to connect their smartphones or other devices, expanding their audio options.

Other notable characteristics include built-in alarms and timers, which make the Grundig Digital Radio a versatile companion for daily routines. Some models even support Bluetooth connectivity, allowing for seamless streaming from a variety of devices.

In summary, the Grundig Digital Radio embodies the perfect blend of traditional radio appeal and modern digital technology, offering versatility, ease of use, superior sound quality, and portability to meet the diverse needs of today’s listeners. Its well-thought-out features and user-friendly design make it an excellent choice for anyone looking to enhance their audio experience.
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