Abstract
One of the problems encountered by users of standard frequency and time (SFT) signals in the high-frequency (hf) band is the interference between stations transmitting signals in allocated standard frequency bands. This problem has been dealt with in detail by the Seventh Investigation Commission of the International Advisory Con~nittee on Radio Communication. In particular, the IA-I/7 research program foresees an investigation of the possibility of reducing interstation interferency by shifting transmission within the allocated bands and using the most suitable form of modulation. Reduction of interstation interference between signals on the basis of time division (intermittent operation or continuous operation with pulse signals transmitted at different instants of time by each station) are mostly ineffective. In the first case as a result of the considerable time needed for the signals to arrive and in the second case because of the difficulties involved in station recognition.
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