Show interference OF RECEIVING SETS each when tuning for distant station acts as a continuous wave transmitter wo we have explained that uio tile continuous nil fairly beeady whistles usually heard while tuning for uio tile distant station was duo to it combination or of tile carrier waves of two which very nearly on oil the same wavu length there la Is another so ales or whistles li latles ul lil imily vilt which very iauch resemble the of a mos bulto both in tono find amount of till an yanco produced taic Ili esol so tire nto caused ly by the receiving sets of 0 other listeners every receiver it 11 va cutini tulio detector with it rege tiel arlve c circuit ir la Is a potential transi nitter 1 in 11 filet fact it colit contains nil fill the or of it a raolo transmitter on in a small scale cule tile detector ulie tube lien oscillating ices littlon exactly sli tillar tu to the lie currier aavo of the ta llona tilt frequency or G of this wave can he be varied by cli the tuning of tin the re colvill L viver tuii tir I 1 T alio i a usual procedure in tuning for it a st la 14 us as follow bilut tile the det tube in nn an oscillating condition sifter after ill alic hiner ling been tilt ml busted hear tho point expert ficco imy taught us to look for cor aliu tile broadcasting stations then move the lo 10 dial blowey across the approximate point luio tho stations nio file list a 11 y beaird the currier lives uru uro locadd liy by it n wh listle which at tile the u upper 1 limit of audibility fillat goes oos alon to n 1 hie 1 I 1 e until it be collies so KO low that it I 1 la s no longer it note at tills point tile net la Is in exact find it if the udder coupling or plate pinto tuning in ts la decreased until tile 1 dolac I tor or tubo stops ov the very best adjustment ls 14 1 dined for rev reception or of hint flint parthe unfortunately lille this listener Is xing through tills operation lilg his re 10 st sol la Is acting us its a conlin notis uffa and Is 18 aronio inhar inon lous walls alls in tile phon i of ills his neighbors alio ulio hai of on to bo be already on the wave or of ulu same ti tation ubo tho continuous anve five bunt built out by tile receiver with the carrier aavo of the transmitting stavon producing nn an audible note if tho the operator could tuno tune hla his set us as simply as ai was described above there would bould bo be very little interference but alitt aiu usually back and forth tile wave of the transi nItting fi tation several loveral times aftem several who tio have apen pan getting the lie concert perfectly will ret got restless between selections and rot got their tubes to oscillating and up and flown down a rew few times all listeners should bevery careful to keep their detectors detec in n non osell lating condition as much ns as possible to radii ce tills annoyance of interference ence between receivers opinions seem to vary considerably la in regard regald to the comparative ain of energy inducted into tile antenna by the single circuit or conductively coupled and the three circuit or inductively coupled receiving sot set previous to tile introduction of the dingle circuit cry little trouble had been experienced alth fill ina ato lt it notes note 3 from receiving stat stations lons tills this was no doubt due to tho alic fact that receiving sets were rather few and fur far between rise up until a few years ago sicre a very small percentage of c w telegraph and phone stations so that there was nos no reason why hy nn an amateur am should keep its his tube in oscillation con condition dUlon on the contrary lio lie was very cartful careful to heep it just below the oscillating point that being the most adjustment for or spark signals with the telephone and c w telegraph emali stations 1 e tube trilla came annie tile single circuit tuner with Us its ext cina ivine simplicity of adjustment which wag so well adapted to the very cry sharp harp tuning of the now new transmitters and with the advent of elioso cheso new transmitters cattle the necessity for making tile the detector oscillate in fit order to locate a station or on the scale of n u receiving tuner Natu naturally trally then lien the between t receiving sets ecta became noticeable nt a f about tile time that the single circuit sets decarne numerous and this helped to the illinois of tile the radio public against tills type of re colver no Ilo wever the fact that the single circuit arrived tit nt about the time with the Inte forence was va by tid no im in uis ms the llie only reason for believing tills this hinr to be the main cause of dise tru uble vor instance in constructing 1 t single circuit or conductively collim tuner tile difficulty 11 Is in reg enerst lion ion at nil all points on tho scale this to show flint there la Is more resistance si in this circuit than in the in couple type tile the main point of difference lq Is tile close coupling to the antenna ming con coupled the coupling to atho ahe antenna circuit lq Is nt at maximum fot t all times limes tills this causes tho the radiation dla dia tion resistance to bo be high which teems to be the factor that keeps ite tube from oscillating freely wit bait unusually close couple coupling b between ap plate and geld arld circuits ahw two e are led to believe that this circuit ys one to avoid it if interference with Is to be reduced if we must har ha single circuit tuners the thing to do to reduce the radiation to a minimum Is to reduce the alz slab e of the antenna series condenser and increase the number of turns in the inductance this will give giro sharper tuning and there will be much less trouble in getting tho the tube to regenerate in many localities there Is 13 n great drill deal of interference from spark stations oils especially in tho the cities on tho the coast or great lakes ahl re there are stations to hundle tho the still ship traffic these espail stations do not tuno tune rory sharply aln alij even if the sta don Is located lopit cd several miles awny away it la Is often lui impossible possIble to tuno tune them out with the aver average age whon when eunhi tuning for a faint station using amplification there Is ii nothing more nerve lacking than to have hac a bpark roar in n unexpectedly cheye Is little that can bo be duno done about tills this it if tho ti to s t a t I 1 0 it lq Is close n of vao lenth would to do little goof rood even if tills were possible if it la IS a acial station it Is doing a much more important than our broadcasters are arc find or course cannot be to stand liy by for them |