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Abstract

This report describes an investigation carried out to evaluate the extent to which 50 cm air-surveillance radar transmitters maybe expected to interfere with television transmission in the u.h.f. bands. Subjective assessments of the interference were made, together with measurements of the radar peak field strength at points along radials from both a high-power and a medium-power transmitter.

It is concluded that, although interference may occur on adjacent and image channel frequencies, it will, in general, be limited to regions where the radar transmitter is sited within the boundary of the affected service area. Exceptional cases of high interference levels at considerable range may occur where either the effective transmitter or receiver aerial heights are great.

The recommendation is therefore made that, wherever possible, the highest television channel in Band IV (574-582 Mc/s) and the lowest channel in Band V (606-614 Mc/s) should not employed where a 50m cm radar transmitter lies within the service area.

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