Title :
A 5 kHz channelling VHF linear modulation receiver for volume production
Author :
Whittle, S.M. ; Whitmarsh, B.J. ; Hillum, R.A.
Author_Institution :
Linear Modulation Technol. Ltd., UK
Abstract :
Increased demand for spectrum has led the regulatory authorities to encourage the adoption of voice and data systems using 5 kHz channelling. In the USA, 200 duplex channels in the 220 to 222 MHz band released by the FCC are now in use. In the UK, a regulatory specification is published by the Radiocommunications Agency and trials have been carried out in the 70 MHz, 160 MHz and 220 MHz bands. Manufacturers are now using digital signal processing (DSP) in low-cost, flexible mobile transceivers. DSP is applicable both for linear receivers and for transmitters such as those using a Cartesian loop. Private Mobile Radio (PMR) equipment operating with 5 kHz channelling is now manufactured in volume and provides both excellent analogue voice quality and 14.4 kb/s digital capability for data or digital voice applications in both static and fading environments
Keywords :
VHF devices; data communication; digital radio; fading; frequency allocation; land mobile radio; modulation; production; radio receivers; telecommunication channels; transceivers; voice communication; 14.4 kbit/s; 160 MHz; 220 MHz; 220 to 222 MHz; 5 kHz; 5 kHz channelling; 70 MHz; Cartesian loop; DSP; FCC; Private Mobile Radio equipment; Radiocommunications Agency; UK; USA; VHF; VHF linear modulation receiver; analogue voice quality; data systems; data voice applications; digital voice applications; duplex channels; fading environments; mobile transceivers; regulatory authorities; regulatory specification; static environments; transmitters; voice systems;
Conference_Titel :
Radio Receivers and Associated Systems, 1995., Sixth International Conference on
Conference_Location :
Bath
Print_ISBN :
0-85296-643-1
DOI :
10.1049/cp:19951107
