   7. Seeing rainbows on Channel One? Better check your cordless phone!Cordless telephones brought into the country from overseas transmit on different frequencies from those manufactured for New Zealand use. Usually these phones are brought into New Zealand unwittingly by individuals immigrating or on a long-term stay. The phones operate satisfactorily for the user but unfortunately cause interference to any television receiver that is tuned to television channel one (45.250 MHz vision carrier) within a 100 metre radius. The area in which television channel one is used includes Northland, Auckland, Waikato/Bay of Plenty, Wellington, Canterbury and Dunedin. Other VHF, UHF and satellite television channels are not affected. The interference effect can range from faint, thin diagonal lines through to strong black or rainbow coloured horizontal lines and sometimes loss of picture altogether. The phones can be traced by radio direction finding techniques but the most time-efficient method is simply knocking on doors and speaking to residents about the problem, asking to inspect a cordless telephone if one is in use. Cordless phones brought into New Zealand from Asia, USA, UK and Europe have been located as sources of television interference. Cordless phones purchased in Australia, particularly those bearing the C-Tick symbol, are likely to be acceptable for use in New Zealand. The cheapest and permanent solution is to buy a new phone bearing the C-Tick symbol, from a New Zealand retailer.
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