‘The Ring Armature Telephone Receiver Istanoecrins NI, ring armatice receiver ie a new sype of telephone receiver de ‘chp for uae in the subeenber's telephoae set, Ie cits tom ‘ther Typ in hat the apap tis ow thirst, am sat cent porian mate af we ely, rom mages material chose fonctios isto radiate sound esegy, suroanded Ly a narrow Fog siopel mature to xhich it sattached. The rng amare sal campss at he fater perpaory, but is held: pce solely by magaotieattaction. Tis Aven at ts ier pevignery by the maanece force ring shaped pole and agree stricture srve as the ator einient to deve the diaphragm. The nev receivers shown in eetional ven in Fig. The aceniige al the cmmpste Hinpheygre consraction jn the ew ernie yet i ental tan rowers wy Hk oto as Ueruee seat 100% eletivesaa thas contevatioe bn be ave tmassf zal, being ofthe erdr af . Far thes ease has ban found Possibe zo rscuce ie mess per ast tea to appreainstely jaf tit of the Aiaphragm ofthe Spor rereerrRessase of Ue age eestve dina fare al the low mae, the acoustic impedance of the new receiver i lo, being about $f thr ofthe exter receive. Although: the motor ficiency is spprasinatly equal to that of the bipolar evens, the haonoved Darigm vorstrition eka ntovfere of higher avslle power response Iwider equenc range rane! rhscterstis when ee eee is Re a ear, anc having reter acriieaton ngsiter room nike “The vag aetaatuce constuction is aso ajloube by cave other tha curplotes sul microphone abd loudepesers tae wie anncercum Huns wera at tes long ben evidont tas the effective mess the august di tye Aisphasgn tne in tho biplasecivor is Lighy and ethene seins Fimitation to obtining an extended frqency Tenge withoat snoring ficencyAetempts weer tordce enieene by osng Hise coe "ype macntoe driven hy reat nll nazi tees at the center ai Fig. 2la), The dient, nowever, of controling the vibrational stability oie strvesaes age am inpmitinal, Mawes the mse them tare wae INF ase tothe moving system hy mesersng the pssonsn he semaine ad he Hg weight tion cf te okey petting elt in hele ating ga netic waver rowel the outs ele a shove in Fig 2b), muck etter ‘ells were bane 9 Tie armature, having oe ege esting ona seating use, all oly SIM of ie ase tothe ving sster, Azo sie Lat lange cera portion af she aizpragm ener rt, i le er pee hy a Sgheweght ronerngnetic rst Iie of The peat ely 1:2 en arte svanme aman evan, JONAH 198 heavy magnetic msteril nal fu gematues, These to frtor eal 2 yexy sbstemtin retin he eectve toes fo be rae a he mir Systm In ition i haa Beet aveervvd thi the oeriotera'ly dsven Glephragm moves ston ove ie feegnency rg ile a conte ‘riven cone ere domi, a i Fig. 2(ay ie moe likey toe passe Ince of wbtution ne feceency Tangy of inter amevers De re ceivergof the ie showin Fig, 2(0) nected mall aap wader to get the fore fctor eereaty to wai a high ficeny. Moreover, te ta roar rise jeg “ig Pre rece ie 2 Ee a ‘agnet octal tne the ine and aster pele pees presente m= craving mens esas of eared lane a had to be great clase (Glerenes, he suaghct this cae Fa tobe a lw aeactance and Tw ‘esti anes sd thi sete in «rater tal testa, Ty adding an cus rng uve ones i font ofthe phage, asin Tg. 19, rediy neve i ling slain ot ees aga, inciecsein force felor wae etange with Inger iv gaps Ua A. Db) 8 hymns an ugh main meget, 28 shen, ould theme eee eee oR RIM ARATE TRLAPONE KILI ns sed to advcsge, eventhough i Lad a eletively Ligier rlatance, Wit ‘his design, megpeti> feds were frocuceé i the cme air p83 above and bow the disphmagn In ascitiee. te ebay rng aagoct ata fo sbust potion ofthe dhe this aun the aratute, mii sent i eased “stornton fn the middle norton of che smataze, which permite increased tha contin the i gap blow the dzphsugm. ais pert ly sepacte he pnts ofthe ae. aid dee dus ia the maguetic tuvcture, ca adjusted ie ognetc forces exerted an the Cgphnagn, so tat lover Sues arcane a Co) - '® ‘ould 3eusad thaninthestructure af Fig. 2). Application of te aug ing magnet i fat of the daphragm corerbated very substantially sean the deveepmen of «alae motor elenen. The cil ad maguct Sslatooship saan ia FS, 260 alo sented in lowes axial Heigat aed s move compact svete “The min aril anxiney maxes he eal design were Ae catings, snl were expensive to provace Ts the profit design, they have Tae foarte Toe wealiy cng aghes, areca 114 tum nncx ase reonice! jormeat, zaseany 195 seat has bees (nual from the main magnet to 9 non-magnetic cele ‘heen alloy “The iets of ths onstruction are vhuoe i Figs, Lace 8. Thecnfeage, consists of fat ring sped vanadium pera rmator, tothe inner Doubts of whieh ie cemented « Titiweigh, plakticimpregrae| aml Folded eloth chine. The dtce is pve ie a caceave downed positon Irth respect tothe ceiver eo, which azetly entnnes is strength wit respec! to suddenly epplie wir pmasues, At the ante prshery he ma Tire ests or the nen-ricgneti est ais driven athe ine agin DY the mejnetic ded oroduoed the tip ofthe rng shaped ele pie. Te 45% permelley! pole pve, a is opposite the alzgap, as an tera Thange estendie ord o wich the rata sat i we ded, ‘Tae magnet bores on te ole pros Fang, euteion othe arature sont Thisemgrel inmade of¢ material sine to female,” lof = modied composition in ‘Slnh the moigndemar nich is snceeed, whieh ele is a higher eo Cree force bu lower sel uetion. ele ht forms ret tral {hur the sag of «cup and then purl lo provide an opening in he bse bse cup, the dacaeter ofthe apering being sgt mle than the fnner tTamete ft eylviral porta of tae pe pie. The ward exter sing Mange of the magnet for the aula peti ‘tmstiesetrols othe resgmaseieguency characteristic of the mever are rovidel "the sume panne as i formes salephoce resiven a te fon tal-dphragm type esr that lover value of acoustic mpelance tre wed Which are ens to al, Coupling ébambers on cach si a the tlaplangn connert to cossieed premgrways having acovstic mas und sucance ‘he nol eaiber tnéer he digpragm exhsusts ino ie Fnoet have cavity tough ‘our hols, oki the peel plastic emia pace, wokH ave sneered with an nema wesbtaaoe fabric <e- ‘mentee he trina pte This acoustic mk veree Wo exten the Fe turn range f the resiver baeause of ste neglive veactance eararies- ‘irs, the asouste restate das oat the iapiagma resotance, The tonplng ehauber skove tae saga census in dhe Listener cy {iy tim the acoustic mags ad elton fe holes in he reeiver ep oper election of the acaaisSapedinees of Fi eames of tis meh ferves sil Sueher tn ened Lae teguerey rae of the ere. The ea lonsnp ofl te acouatie snd mesial elements is sacha to aloe hese sponse egueney characte (Se ection evils “Newark Repreenttin There ere several pur of the ring amuse teiphore seclver whose agg fie bd sutée Patel Soe PRUE jo ia Miser ae Nem fespine Se Ws fst eB Syn Ye sr Pa Sui, fay [ror mise ABMLATORE TELEDHOSE RECEIVER us acti ane alent ommplecly sechaaial, a compe with the mage re, elcrcl, or acoutet uesone of ocker pests, The aemacure set, ch aleady lt bees mentioned, is one ofthese. An interesting design Festa of this rt the esl Tor hgh lckal esiviy si ofthe wc fix links the tat and itis therefore subjert to eddycurrent Tees A nikchromim aly bas tne Tournd salle for this part Anoter pat hav'rg pan'y reindeer fhe el yp, The pt Comte ef a rp of metal purshed ia curve shape oo ae ta Gt 98 top Ut Tecan avin hace prongs beat at right angles tothe sep. The Vivo the ngs ns throu ss the polopieedenge aad ae bent over i ase to aol the ein place, A memnune is mound between the Protective ui ard the wagaet lange to eep dust and otc foreign sub Sno sut uf he intaunet In thi zeeiver the poteeive gid aed che ‘ampinglerecl, which is ximped over in she al aesrbly, ze combine Low mtnutaecuing costs are reslsed by che ase of maltiple purpose pete Some emerples bev bene ely. The sige rset ering, ne tot sein magnes and ae Try magne! fe an ecu: The sombinel femralegri, waih eliminates Ue labrcation, fishin aid handing of one [rt ns compara with previous desig, fatter, The lenin pte al fals oc che css of pacts Tol unly ser sn local Leena oe for tne receiver, bata eacel fn sic u way ew povee Ube ene rupli ale wluine i back of the daphzegm; It cotssing the acoustic Inssienays Tang out of the Baek of the instrument end proves @ Irowating sfc far the ncOWE resistance Ses erent oer Ps Dsengewnye; 't moents sm vavix a elishoralction varie whi de pnt fe reiver i iw wh projection whi provnt he ‘pode tp evra af th handiat cond fom shoring aga the variate fhe or turning Iv such a taner a8 to enus0 the cord conductors to be Pinched betwen the vereiver and it handel eating aang thas ahr Drojections whist sey ine Ce oiled ble 2 te pole pace and provide Ftation betwee the were aul the polopisce an at the sane tine oreut neve rion ofthe tenia plate with respect 1 the pale pee “satis proved witht lt no whi the vipa eg he eee insted to preven rotrion of te feral echaps te most Hntereating example of a mula purpos parti the lity dhe Ms rary uepone eof cous, to radiate curd enegy ins excl Spel, gd lsat for the ental epening of the aerate. Thain, it has sk eal projecons moked tots top surface jet sie of te le portion, whieh wi ouch she anes alge of he mgnet eng the clash fel uowacd ol ial by meh ook Th the prajecons prevent che armature fom coming lace enough 116° rn nner avenear suemsiean Jorasat, JANUAHY 1981 to the susan vsyaet to be Hell here by magnetic atnetion an insure thes the ommature wil way sete to is Seas i cee i esha Dy Iacchanical seorks Anther aston sch ie bu its ta dare ener prevent the ons age ofthe armte Fe emg into contact vith Ue {side uclre oe lade min portion ofthe mage. Conic of tis ‘tie ha bean fund to prs reaulais in she rss recess of the recor and varity ofthe outoet level of Fe Ces, These uadeieok vartiens cre omtraler by six apokes of the ‘Some mace ch even! oulwand beyaad the ee a the emzature afew thensendths of en neh nl th end fo preven canta beck the arma tine el tuagacts nly, the dome consis xl bole wi introns 2 ow fresweney sf the fesponeeirequereycheractorste ef tie r= ba inl bE, \| * al ive, which has tat fou eo be csr eace tevference picked up Sa telphone cuits fan elsuzal pow eat. Pomonmaser Cnansens:e1s [A partial evesaton oi he exoemanseiaproverent a Uke ig arse ‘abe receiver as compared wih it preeossr ase a Fig. 4, whieh howe null joer teeponee‘nequenry hurlers far he 80 cise The tne sures in tie gee swe se rltse sour posse fuepes of she nen UL sever the pr sandard AT teeiver wer BREESE GU rwachee eetin a fo l eee ot {HME MING ARMIATCRE TELFPREN. RCRIUER aw ‘hie sequeney anges These sli curves wre mensared with te eeiee fon a standend cased coupler uf si sbic oilers wom, ving 2 source sapedcace of 128 ol, ad the minal sale i even interes of the pero tho preseuro gereteted inthe cousin per uns a ers ewer nvble to a pure resistance of 128 obms suettuced inthe cette. fin ace ofthe ceiver, The ac revs dibs pmverent in on lve ne bout S00 eyeles pee senna extension in the reqweney rage: This represents a very substantial inerase in teaalicer ellen, 34 the inerage i range reals ina pte matin improvement ia tae squility of speak: sounds. The low Frequency et of obtsined Hy a Rae i He digpieagon of the UL sectors, me on! inthe presen section, a> pear a the eqne-feequerey haneteieic below 490 cycles persone ‘Tho ‘regu ts Can characteristic ofthe UL receiver at stand a cycles pe econ’ me co inerere in the eesives, Wu ee aaa llr oF the pasgewsy molded inthe handset haba, which cores asa cit tr te wines cannot 1 te receiver am, This indnted by the cashed line curve, which shows the response fequency eractersc oft reir when the passageway is plogaed at the reciver bol of Uae haute. No verse effec of ches sregnartes ns been eiscere Tr compasson with she cored coupler ebaecteristic, the dott carve in Lig. sons tac preeucegererated by te UL resiver et te eran the hema car There fa net af 00 chasrstione on 3D sues sueazual bya sual amet stad tbe ir int the mer eo city Aeugh the receiver cap and connected to a mieesphone extra tothe handset, 59 thatthe ear is used a x passive couples. Figure § shot che ‘mone: of sing the eppactus, which includes © 640A condenser rare rnitter mount on the vat an coupled to he serch tube though ‘ery small chamber Te willbe noted that the curve of Fig. taken na Iremar ar shows sneeuse low Srequeney cut becauee of leehege in tote the rear”) an the ear, ft wchorive the eed Covpler eons el represertation ofthe st taken othe eat Cane ‘Eder Me devia foe Uae everae curve were ober fram peso eis, a5 stated ia Fig. 6 whics slows the auaimam nel nina ‘lus of allmeesuemens various frequencies al De tara estan tlhe nssuteneut at thee freuen ‘An interesting compsrison of the pedfomuance of he UL and HAL me cites is made by aoing the veccivers slightly avay rs Use eur. zeros tha the cegbation in respouae caused ly thi contin wich Teprewrts very Lage emount of acoustic leakage Setneen the ea? = Ure resiver ey ie mack grote inthe IKAL geceiver. ae eet ele ype cope pt ASA, Suda 249-160, 118 sum neck yma vesteaT jormeat, aseauy 198 Laxted by Fi 7, whi shons aval power response tegrency character Tats Ca bo receivers whe Hy ae ian! evrghi 24s Gam, Iie reamal cele posite snr stands coopie™ "Te TL rosver shows Thewerseaponse thar ibe HAL sciver at hock higt ad ‘sw frequencies ‘The cw Teqieney an ise of lesen the 2 veceler,Eecae it has 2 tines Inrgrlstve aces ad temo isa beter ato of und at lw Feguencie "The hig Eeqacney end hetgebecse ofthe inherent xten= Srotier ineusting ehorasersic ofthe new every ts poriomanse ‘uate rnin of Beh mbes levee. Noi leakage beter he receiver cap th eneral eae geesates a senustie aie pres he (rcaly whith moy sask we sound ign fo ve sie Tais Tele PE ING SRALATORE CELEERON RECRIVER ny Se - | za | Ti tt pee ‘aie is predeminantly lw froqeeney noise not only because typical com Foxe arate Wy sormeses wi inp eae se 1 Wa pa soul peace ich ae wth fe