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PAGE 6. It is quite important in assem- bling this receiver to arrange the apparatus carefully. In this type of hook-up. when the plate circuit. has been tuned to resonance with the grid circuit. some of the energy in the. former is fed back to the latter through the internal capa- city Hf the tube. This feed-hark of energy is controlled by the plate variometer. If. however. mm:- of the different pieces of apparatus are placed too close to each other. there may he a feedback of energy from one to the other which would be beyond the ()peratnr's controil. Such an occurrence is often the cause of howling and general poor Operation. The grid and platn Variomotm's aspecially must ho knpt swam-10d. Thv :u'rangnmnnts in Um diagram bPluw pI‘OVMPS for tho prnpm' sep- aration of parts. mvnh. this l'N'i‘iVPP is nut wry easn for an unfamiliar upmutor to usv. This lamp numln r m cuntrols hom'wr, [DPIHMO‘S a. nit-ans Oi eliminating undvsirablv stations. and Uw .lil‘firulty in using (him vm'l'o'i'tly may lw. nnsily mm'vnniv with n Iittlv paw-mu and practicu. ’I‘lii- griol variumo-im' is ilw main tuning adjustmvnt. It is gmwi'ally si-i. iipnn UN' waw lvngth df‘Sil‘ed and ”in ntho-i- vii-runs mm tunmi to rowinam'v with tlw gi-iol i'ii'cuit. 'l‘ho- alll'HXillmh' si-iings «if this val'i._inivt.m' “mm ”in ilii'i'i-rmit sta- iimis Ill‘al'll. simulcl lw I'N‘nrolmi and usml in lm'atim: thusv stations again. Tune Carefully .\.~' soon as tlw griol Val'mmo-tcr has Down :uljnstml tn givv Hu- lnucl- 05!. signal. Un- imlm'tam'o- switch «m “w primary and tlw primary conâ€" do‘nscr shou‘lol lw manipulatml Ln .\.-z thvrv nrv fiw tuning adjust- â€"â€"â€"â€" ‘l'ho Explanation At. one of the many clivmplinwntary dinnors giwn in Sir Harry Lauder on his l‘t‘l‘t‘lll world tour. ho crealrd roars of laughtrr by to'lling a story cancermug an old Scottish woman who was bitterly opposed to the introduction of an organ in the Kirk. ‘ ‘ -_,I In.gpl nu n. One. day she paiticularly and lend- ly expressed her dislike of the. g of an anthem. remarking a hold \xi these new- "Why, granny ’ remarked the minister soothingly. “that anthem is ‘ It is from the _ _ 1.. AL- “A“ nng ' "I shouldna wonde marked the old lady. wonder at a’. That w: Saul threw his jaw when the laddie saw Three Circuit Regenerative Recelver l ‘ I 1 fi% ,- ._~-â€" “ -__â€". "guy... ___.~_¢:z ._ -4-.. -_â€"â€"- L â€" .‘fl '0‘“ - :1. fl m 1f H. says: "I am using a tome-made Superdyne m- I am getting excellent mt have. trouble in shipping from howling whenever I 150 the last tube. Can you a remedy ‘3" 'â€" Arranqemenf Of 139113ij : Three Circ mt Regeneratwe Recewe‘r J1 the different piecvs of Lina wonder," drily re- a old lady. “I shouldna a’. That wad explain why his javelin at David E laddie sans before him!” K. (Part 2) By R. M. SHERRILL (Radio Engineer) more as possible. IIIU‘ ‘1 w r VW ..... The plate variometer is next ad- justed. As it is turned up slowly from its zero position tlw signals shoulol bocomo loudol‘ Until a [mint is reached whm‘o there is a click, and tho tulw breaks into oscillation, tlmroby distorting tho signall The propm- adjustment of the plate \ai-ioniotor is obtained when the rotor is in tho position just before that point whm'o tlw oscillation starts. 'I‘lw ailjnslmont of “no coupling lwtwoon the» primary and socondal‘y clolwmls vonsic‘loralily iipon local conditions. If Llll‘l'l‘ is a lot of in- tm-l'oi'om-v from other stations the socomlary must be as loosely l'OllplPll as is ru'icossary lo cut out .tho- intm'l‘oi-nnoo. (Tho loosost cou- plim.’ is ohlziiuml whim the second- ary is turned at right angles to the pl‘lfllil-l'Y.“ This of course woakons increase the signal strength as much Llu- Signal strmxg‘th sunmwhat. In gmwml. from the loudest signals. Um primary and sc_'culldal°y should km (-01.1le as clnsvly as possible without, allmving ntlwr stations to inlvl'fnrv Anutllm‘ way ul' rmlucing interâ€" l’vl'c'nce' is by the proper mmbiua- tion of inductance and capacity in llw primary v-irvuit Wlwn a signal has hm-n tumul in at a certain Hm- .lvnsvr svtting. it. will ht! nutivml that. if morn 'turns are mlclml at. tlw imlm'lmm- switch the sump station may lw tunml in again at a Imwr selling on the condenser dial. The signal in tlw svmml 0350 will bu a liltlv \wakm- gvnm'ally but. will he I'nm'c- l'rm- I'mm intm'fvrelwv. 'I‘lw npvnanur 01' this l'vcvivnr must lw «awful in tuning tn lump his plan \"dl'l(_)flll!l.l'l‘ luruml so that, llu- tnlw will nut. mclllutu 01' it will inu-rl'l-rv with other receiving sla- liuns in tlw uvlghlmrlmml. 11. B. 'l‘. asks: "[3 it better, when mum-rung two pairs of lwadsets to a crystal receiver, to put them in svrivs or parallvl?" Ansâ€"4f the lmadphnnos are ex- :u-LIy alike they may be put in pal'cal'lol. ()Lherwise they should be connectet'l 11m serios. :3 '\\~ Give us a < please you. a? m. The Ladivs' ‘ ham? to disarm Sister Esmorfl the halo is Mu applauded. (.IH‘V Ahin O'Br' “ken in 3“ bwmont f ' All NW N. "pp, Hwy '54 jlmhnrm' .Ql [.tII)li( wtu. BY CR1 WE‘LL Just a killcls‘ 0f mm'n "1K 39 cent»; ‘nd UNI!) Firearm r0 gnu Suamn“ KIMWS as mw IN (N MON