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Research & Development

Abstract

During the winter of 1968/9 observations on car radio reception in the UK were made by a number of Βι¶ΉΤΌΕΔ staff. Questionnaires were completed by 29 participants covering the reception quality of Βι¶ΉΤΌΕΔ services in the low frequency (LF), medium frequency (MF) and very high frequency (VHF) bands.

Analysis showed that the single LF transmitter provided a reliable service over most of England and Wales. The quality of reception of the MF services could not be related very closely to the median field strength, particularly at night when fading and interference severely limit the useful service areas. Both LF and MF services were relatively free from local variations of signal level, even in hilly terrain, apart from brief drop-outs under bridges or power lines.

Reactions to the VHF services were very mixed. Over half of the assessments rated VHF as 'worse' or 'much worse' than MF and it was only on short journeys, such as daily commuting, that an appreciable proportion of the replies rated VHF as 'better than' or 'much better than' MF reception. The limit of the useful service area of a transmitter for car radio reception on VHF corresponds fairly closely to the field strength contour of 1 mV/m at 10m above ground level. Proposals are made for ways in which the VHF service could be made more acceptable for car radio reception.

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