DIGITAL RADIO GUIDE

SATELLITE TRANSMISSION - SIRIUS / XM

Changes Made For Sirius Inclined Elliptical Orbits

Parameter

Geostationary

Inclined Elliptical

Dry Mass

1300 kg

1575 kg

RF power (operating)

2.5 kW

4 kW

 

 

 

DC power – EOL

 

 

Solar Array

7.5 kW

8.5 kW

Battery

7.5 kW

8.8 kW

Control System

3-wheel mom bias

4-wheel mom bias

 

 

On-board orbit

 

 

propagator

 

 

 

Control Modes

Orbit Normal

Orbit Normal

 

 

Yaw Steering

 

 

 

TX Antenna

Fixed Gregorian

Gregorian; two axis

 

Gain 27.8 dBi;

steering 360º rotating

 

Cross-pol 24 dB

shaped subreflector

 

 

Gain 27.2 dBi; Cross-

 

 

pol 28 dB

 

 

 

RX Antenna

Fixed offset fed

Offset fed; two axis

 

 

steering

 

 

 

Solar array

2x4 panel HES

2x5 panel HES

Battery

2x32 cell - 149 AH

2x34 cell - 178 AH

 

 

 

TT&C

X, C and S bands

C and S bands

 

CONUS ground station

2 near equatorial

 

Limited motion antennas

ground stations Full

 

 

motion antennas

 

 

 

Launch Vehicle

Ariane

Proton

 

 

 

The launch of the Sirius Satellite Radio constellation marks the first use of satellites for Digital Audio Radio Service broadcasting in the United States. The three high power direct broadcast satellites will provide service for millions of subscribers. The Sirius Radio system is the world’s first satellite broadcast system using non-geostationary orbits.

The use of inclined elliptical orbits coupled with multiple modes of transmission diversity provides notable advantages for broadcast service to the mobile market. Pioneering technology was developed and implemented by Sirius Satellite Radio and Space Systems/Loral in order to accomplish this unique achievement.

5.2.2Deployment Status

Current population and transmission status of Sirius and XM satellite radio services is shown in the following chart.

 

Continental US

Satellites

Ground

 

Coverage

 

Repeaters

 

 

 

 

Sirius Satellite Radio

100%

3 in HEO

~100

XM Satellite Radio

100%

2 in GSO

~800

 

 

 

 

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Grundig Digital Radio manual Deployment Status, Tt&C, Continental US Satellites Ground, Repeaters

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.