Quote:
Originally Posted by Wendymott
When I was a TV apprentice in the early 60's, our workshop was in Ilkley west yorks. Ilkley had an RF cable system that was basically Band 1. The aerials were sited in a field just below Middleton Hospital.....in the daytime occasionally viewers were bugged by swirling patterns especially on BBC1 CH2 .. this was tracked down to a Diathermy machine use in the Physiotherapy dept. Large power on 50 mhz ish...the only cure was to re site our aerials to a field further north 1 mile away.
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Our first family TV in 1951 was a Pye FV1 12-inch set. A page in the user instructions carried screen photos of different kinds of interference - car ignition etc. One picture was of radio diathermy interference which showed loss of line sync over part of the screen. Despite living near the local hospital, I remember being slightly disappointed never to have seen this in reality.
Martin