RADIO NOTES

Rotorua Morning Post, Volume 1, Issue 8, 1 September 1931, Page 5

RADIO NOTES

"KatWe."

| By

Improvement. he Wellington station 2YA-- has i heard carrying out frequency 3 between the hours of 9 and 10 , and as a result, tone has been itly improved. Bass notes are ricb and full, and from a techI viewpoint, quality leaves little e desired. Effective Combination. he day of the horn type speaker I passed. Though able to reproj the higher registers brilliantly, r were quite unable to pass bass >s. An attempt to remedy this ng brought into vogue the famicone type speaker, and later, the imic or moving coil. The first amics over-emphasised the bass :s, with the resnlt that music ided mellow and pleasing, but not gether natural. The modern dyie, when used in conjunction with xp-to-date amplifier is capable of oducing high and low notes effec•y. Preventing Distortion. frequently happens that owners sensitive receiving sets eomplain istortion when loud volume is bereceived. In most cases this is sed by overloading the apiplifier he loud speaker. Natural volume II that is required and one must areful not to overload the receivffherwise blasting and distortion result. When one realises that )eaker before the microphone is ing in a natural voice, it will be i that too mueh volume is being [, when that speaker can be heard i a block away. Bad Conditions. pnditions for long distance recep- > during 1931 have been the worst jrienced for some years. This predicted by many of the leading 0 engineers as far baek as 1926, iit has proved conclusively that litions alter over a eyele of 11 s. From now on conditions will [ually improve until ideal condis will prevail during .1936 and I. The year 1925 was particularpod for DX, and had receivers in then been as efficient as those of ay, astounding distances would \ been reeeived on the broadcast 1. In that year, Kathode possess1 three-coil, three valve receiver. tubes were very inefficient and ag was a tedious performanee, kmerican stations using low powvere heard nightly on the loud ker. K.D.K.A. and K.F.O.N. d be relied upon any evening. iformer station also broadcast on letres, which was then deemed to xtra short wave. Talk with Ecuador. B. G. Thompson, ZL1BG, suced in holding a two-way convern with Ecuador last Saturday •noon. The wave length used 20 metres. This is a high velowave and contains fourteen milcycles per second. For some ;hs that particular part of the ;rum has been dead and trans;rs have been anxiously awaiting 3turn, as it is the most satisfac-" ; frequency for ultra long disi contacts. Radio Cars. •dio equipped cars are in common in America and the time is not .istant when service cars in New ind will be fitted out with radio vers. One of the leading service irms in Rotorua has already orl a special receiver for use in of their cars. Previous to the ttion of interferenee suppressors lotors, radio reception was alimpossible, owing to disturbance •P by the ignition system when jiotor was running. Short Wave Transmitters. ere are five short wave transsrs now in operation in Rotorua, are ZL1BG (Dr. B. G. Thomp- ; ZL1CL (Mr. I. D. Shearer) ; 1BN (Mr. D. W. Tapp) ; ZL1GM |D. C. Cuthbert); and ZL1CL J. Talbot). Mr. H. Smith, of the Office, also operates a short

wave transmitter for the Post and Telegraph Department. Noise in Receiver. Noise in a receiver is frequently caused by a valve making poor contact in its socket. Slightly move each valve while the receiver is in operation. If noises increase, have the socket attended to.