Radio frequency spectrum users
The part of the radio frequency spectrum concerned with TV interference is:
HF 3 MHz to 3OMHz
VHF 30 MHz to 300 MHz
UHF 300 MHz to 1 GHz
Some of the transmissions which may result in TV interference are shown in the following table. Each transmission frequency shown is approximate. because a small band of frequencies is allocated to the user For example the 1.8 MHz amateur band extends from 1.81 MHz to 2.0 MHz.
It should be noted that most of the frequencies used by amateur radio operators are often obtained by using oscillators at other frequencies and the final frequency then obtained by a mixing process; hence there can be low level radiation of the fundamental oscillators or any of their harmonics or mixing products.
A full list of the radio frequency allocations in the UK is given in:
United Kingdom Table of Radio Frequency Allocations
Published by HMSO. Price £12.00 ISBN O 11 5138196
