AMATEURS LEAD.

Press, Volume LX, Issue 18233, 18 November 1924, Page 13

AMATEURS LEAD.

LOW WAVE WIRELESS WORK. (SPECIAL 10 "TBB GISBOBNE, November 17. Wireless communication on low wave lengths is now rapidly coming into vogue, and many amateurs and experimenters are turning their attention in that direction. Mr E. A. Chief Telegraph Engineer, remarked today that the position was rather a peouliar one. "Some time ago," he said, "amateurs all clamoured for permission to transmit as well as to receive. In complying with their wishes, the authorities allocated them wave lengths from 200 metres downwards, to prevent them interfering with commercial and broadcasting stations. Great was their astonishment, however, at the results secured by amateurs on these low wave lengths, which have far surpassed those seenred by the commercial stations using immensely higher power and higher wave lengths. American amateurs have been put on from 150 to 200 metres, and New Zealand amateurs on from 140 to 180 metres, yet on these low lengths they have secured remarkable results, and have greatly advanced the science of wireless.

' 'Perhaps the greatest advantage of low-wave communication is the facilitation of extremely close tuning, which is impossible with higher wave lengths. Tako two transmitters, for example, of 365 and 3654 metres. With an ordinary type of receiver it is impossible to receive one without interference from the other. Go down to lengths frelow 100, metres, however, and it is possible to receive without interference a transmitter tuned to within half a metre of another.

"Thus it will seen that communication oij these lengths reduces the possibility of interference to a minimum. The lower wave lengths, too, seem to have a distance carrying capacity which cannot be secured on higher lengths, as is demonstrated by the recent amateur achievements. There can be no' doubt that for some services low wave lengths will be employed exclusively in the future. '■'