RADIO

Rotorua Morning Post, Volume 2, Issue 526, 9 May 1933, Page 7

RADIO

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w ,„rir the last week has 5 «eiy night bemg tic. dgnal could usualf£m 2YA day' ?s,»e a»« this statl0n dly. ' P5inabout3p-m-fnd ,n siation shoitly altei ,,rsta'ebccn'orfmC Btk the df-\oi. °n" Sbeingbroadcastfrom i j YA station.-. ExJ^ional item, the pro,«.t be considcred bnlucert platforhi the per- „ neriorir.ei' « o.t-ii le"saceBtofthe.tem. g,od deal nf tha B ^eraSe Menerrte l0t entertammg. -YA the worst offender hopedthat there will le more life in their proper has asked that 2YA's L «11 refram troni HGolopolli. Our same told us that 3ir. John '•torytone." 0 Ubnverea,i about ,.]heh the Wellington 'the Radio Enurgency ,ge to givc to the searfgrarua Ranges. Tt may ,]ly known that a bi-aneh : exift? ia Rotorua and b!e transmitter is avaurgencies. :ars to be a marked iau|e nurnber of home oonie efficiency of the modjs no doubt pavtlv retH, To ■eonstruct oue is rond the beginner and [ cannot be pnllel duvn ie batterv set. Ilowover, a doubt, many ommmns ner of a modern broadTvishe? that he could get re stations.

uction of a smtablo redifficult and con provide Bf profitable oceiipe.lion. tv;c-valve set is ea.-y to onomical to opera.e and j{ radio reception is re0 anyone who feels that e to get busy with the nT 0f person? offermg to airs with ou t havir.g any to do the work api'/ears increase. ; of a modern lweivor te entrusted to a person land practieal knowledge ricing and construeti.in. men in Rotorua as well fcave known several ine person? have taken in iairs, got into (liilk'ulties then have gono round | t somebody to tell theai | Owners who do not know ; meone qu-ilified to attend j are advtscd to make a i 3 and not enirust it to | 1 says that he can put 12, 1007 S.O.S. messages by the B.B.C. and 10 them were successful. imany police request i'or ibout erimes. ® cored tuning coil i'or ers will shortly he avail- i lated that these c.dls n t , dgher efficiency than Ihe j dair cored type but aho j to degree of seleetivity j 3 for a given number of Ma new one, the writi a similar coil made by a manufaeturer about ! igo. The former was a tube which was iilled | ivided rnetal and sealed. and secondary wimlings itrnd on the outside. This ' itresults judged hy the J reception we were used i ip. I Enlars available it would j tke design of the new j »on a similar prmciple 1 lonbt they will be inore the earlier ones. | liffled as the first rold i |iee known as the "Wes- , i a developnient of the 1 ®dal rectifier and can ! it' and intermediate f re- j s to replace a griu or i t As it requires no lecurrent, it eliminutes : jroviding a smoiith.ng ! ie anode supply to the fees not amplify. 1 1 is i sizes, two for half v»avo ; dl wave deteetion. Auto- ' control can be oi.uineil tfullwave Wesi W.c.is obtainable fn.ni 'alf-wave type. will be broudcas t |YA stations next SaPtion 1YA will be « n f? s.ni. and will relay ^le day a running [the Auckland Trutting [,at Alexandra I»ai-k. * ; Py listening to a Yv nr-

litzer organ will tune in. to 2YA oi Saturday evening, when Paul Cullei will be heard at the instrument in tht De Luxe Theatre. Previous broadcasts of this artist have proved very popular and in his singing novelty or Saturday he will include several wellknown songs. At 9.2 p.m., 2YA will broadcast on relay from th'e Town Hall the eoncert by the Spdvakovsky Kurtz trio. This should be an exeeptional treat for music-lovers. Professor Algie will continue his tai'ks on famous trials from 1YA on Tuesday, while on Saturday, from the same station, "Old Wire Whiskers'! will speak on the famous "Marie Celeste Mystery." Another lecture which will probably interest many listeners will be given by Mr. F. L. Combs, M.A., from 2YA at 7.30 p.m. on Saturday. His subject is "Glimpses of the EighteenForties in New Zealand." Short wave enthusiasts will be glad to know that the Philips short wave station PHI is again on the air and is at present working on 16,38 metres. Transmissions take place hetween 13 and 15 hours, G.M.T. Reports are asked for and should be sent to Philips Lamps (N.Z.), Ltd., 286-288 .Wakefield t., Wellington, who will acknowledge same and forward them to the transmitting station. j From reports it would appear that American, Canadian and Mexican sta- ; tlons are all being received strongly •' in various parts of the country, and , local listeners have been able to log ' many of them. The Australians have also been good, several of their B elass stations coming in stronger than 2YA. ; Causes of Interference. Causes of interference with radio sets were discussed at the conference of the Electricity Supply Engineers' Association in Sydney recently. As the details given may be of assistance to those endeavouring to trace the local noises, we have pleasure in pubiishing a short resume of the findings. Mr. W. T. Crawford, senior radio ispector, said that the radio inspectors' department was handling 200 cases of interference a month. Commutator motors fitted to vacuum eleaners, refrigerators, etc., were responsihle for 39 1 per cent. of the interference. High-tension, although a severe form of interference, was responsible for only 9i per cent., and low-tension caused only 7 per cent.

| Traction services, such as electric ! trams, were responsible for 10 per , cent. of trouble. The percentage } caused hy receiver faults was eight, I and oscillating receivers (that was re- ; radiating or "howling" sets) were responsible for 3 per cent. Street ligliting faults (loose contacts, etc.) caused only 1 per cent. Mr. Crawford pointed out that electro medical apparatus, which was responsible for 1 per cent. J of interference, had been known in J country towns to infiuence reception | over a distance of a quarter of a mile, ! while flashing electric signs in the | eity and suhurhs affected sets over a ! radius of 100 yards. | Mr. D. Wyles, technical manager of ; Philips Lamps Australasia Ltd., said that a scparate earth should be used | which should be as short as possible. ; Mr. A. E. Lemaire (Leeton) expressed the view that manufacturers would serve their intcrests hest by making sure that their sets were installed hy qualified men. Mr. H. K. Burbury, radio inspector, said that electric trains in suhurban areas did not cause much trouble, mainly because there were few residents within 50 yards of the train, Trams caused a. certain amount of interference, because they passed through thickly populated residential areas.