Show jolt 0 VJ 0 by ag F j H ARMSTRONG ON A aati aiti 1 f I 1 1144 1 I Is t I 1 tin to ill th oil IP 1111 ill i j I 1 leallia of jo V radio i rolv ala inc sill alj ulf if JI a V ailt irin placed tin ti n lu allt 11 NJ us I 1 I 1 it 11 will ill lv n u J no ou ballul how fit 1 enily i it I IN 1 plucked if jl tit the I 1 to LIV IJU n ul t both F AV 7 to to IV A mch boutil 51 00 01 irlies pue billial Us annl 1 wire then lie ail wire 14 will 1 most 01 HI in illel bunow koun 1 0 of j 0 1 hi lq 11 ie 91 alie all ev the 1 nt 39 lilt tio the ati cil etire ft lien lucked ami pau aben if aai ft to 03 sui ing i as e aill we sit hove a tuner con to 0 an us aerial ground a be bhonn in ul the alit ulvi further that juill this will tuner jaunt I 1 1 ad pu kinf to 01 a 0 wave aag length of jo S 0 meters or JO ih 41 other words that jell it will reimond to 01 thi bill wae 4 length our ino desire then ill I 1 to 01 see ads whether hie still 1 I v cooj tuner jaun or jo a v poor one ouo on otto a of 41 the tuned type suppose that lie ail condenser con denaer 3 and pug the eq I 1 L are to ov adjusted that the it I 1 tuned for the aill wate length of so as so men elam then that we ax could put ind a v very sensitive isaas aAp device in ul the circuit linail lug ay an uv ammeter as ev honn in at 1 I 1 this ammeter lamula ja reads in ul unite of o 0 electrical laala leali current alain iu then by sq causing the antenna to oi be struck by sit radio saig of 10 lengths both short and pau long we ex have a chance to 0 observe asao a the eq effect on no the sip ammeter in at what aum be eq called a v tuned paun circuit as su represented by sq the sip condenser and pug the alit connected wires this tuned circuit 1113 Is sl simple and efficient switch stops easily made PUN a switch stop are sill mighty Li cheap but inq they can however be considerably ira all proved as is there ore sin several faults with the ones nano now mou on no the market Is it described a 9 system of so con strutting ting switch points which will ill prove extremely simple silicate and PUN efficient as so stops they can nual be eq made opera of so thin atilt cheet brass copper or jo tin up and it requires sail but a v few ata moment to ol make them I 1 when made opera properly they will denot deion JIMS plod 64 4 afla I 1 1 neat switch stop li el made from piece mid of 0 sheet metal tract from moi the appearance of so any low act law the idea la ll as ov may lam best be eq leen by ill the drawings to ol cut a v thin piece of so metal so at that it Is ai ila wide as 99 the ail head a of the sill witch are all aich and pug as lon as the circumference of so the atil point A place should be left ual in ul the sip center bulfinch op da la at the hape of 10 a 1 semicircle semi circle the bald of so brim should now mou be eq beat tightly around the witch point where the sill top dolt li sl required ba Vajin these twitch atop idols will be found neat NOU la at appearance can be put lad on no without drill lne hole in ill the panel tatted and pau mn be maj removed PaLo at IV any lag time step as 0 o that the witch point lam be eq cleaned or jo the tendon of 10 the aj switch lever news imag water pipe better oj for grounds uncut sp or radio sets ga ou pipes baa leq been for 10 ose gen as IV p bunds for 40 radio sets flat by lq the alit underwriters if U the pipe should pen to 01 leak and pull I if 1 a V bluds spark A happen to 01 jump at IV that point then it piroa hjal likely ignite the gas with perhaps il lustrous result lant water pipe sadid inake fir better rounds than cas sell dadid for joi the reason that they carry water jegi anil there I Is 1 always 1 certain locus lut a of and pan mott ore aim around them in UI the round which Is ideal for a radio 0 seu it Is g always best joaq to at connect 1 the ground P on mill the sip pipe before it 11 enters the ta ater late JOAM moia the ewt mains for clear reception A V too fixed peru condenser fron pijo rid val leal on the sip be secunda rj of so the second audio frequency transformer to 01 the opt of SO the filament of so the first tube win clearer and p loader reception am j PROP very ul 1 tat IV of jo the of SO q 4 A wire 11 4 to 01 lie all sure ains the eq would hnyp to ul be v Milt lf oil ajl of 10 let jai ui in oll that 1 w II hav aali irh v atio on hand paull ualle for I 1 ivea glenal I if 1 A the eq 1 in ul til Incon iloe cirill fr 1 J rlou frequencies we am will A 11 H tun connection important in ill Y let lag the two wires coo ao ao 1 hie j marked tt nn till 1 I it 11 dill pal to 01 ill the detector lal iolia and pus it 11 10 of JO dill lh r J depends upon lie all ulam JAI 1111 i PP in ul elp itric oin be M lafi IM the dill cirp I 1 ail A annl I 1 it if j I lin urther jolt jj fort I 1 11 aln 9 U jig gill of it otil illila 01 cond ner 1 nt ill a 9 alvn mine au hagth lie all pressure in li I 1 I 1 nil jolla nt ill ill in ut lie dill of so J lull lowenn XUI 11 HIP dill uj condenser it 11 in tit if j inn to 01 ninke juill 3 this ill nil jul anric ns so in ill 9 given lilt 1111 jolly 1 it 91 I 1 libil imbed lia by ill anak ink lill DP all ji dM nv A tuner v low sill IV fillia 4 italia AU will ill eap P a u gi sharp or JO sia pi 1 jj kol I 1 rune ill a alien lid it 31 81 I 1 tuned to 01 tic 11 0 1 JIMI Jul ap at length avit pal if it 11 ll a Is 81 it cieli 1111 alit lie tuning li NJ oil not nt lit ill 1111 if JI the alit frequency merlei Sal fl I 1 L or jo 02 mal 81 W each tiava elde opts y 11 1111 17 0 J mOtIS showing the and put Con uC up denie o of 0 very little change li sl produced tuning not ION sharp first the tuning Is ol not ion and pug the effect adja on no the eq aap detector jo circuit it 1 p batly pai reduced palan it 11 would not IOU be ail no oi undesirable if 1 it 11 were only the decrease in ul the signal strength because we om could probably hear signal in ul the phones even though they were not lou strong bacilli but inq it would be eq ilza extremely llama bothersome to ol hear a 9 great variety of so signals produced by sri waves of so different lengths which the eq circuit Is it incapable inis o of 0 and PUN which could pino be all eliminated b a it better tuner jaunt aaz ew aaa york sun uns your amplifiers would do 01 better work I if 1 nol would use asa tha proper transformer camlo on a 9 certain tabe not ou would pino A ground the sip coree of so the transformers ere even if 11 they are shield cd pa udas separate alvi the alit transformers about 3 9 or jo 4 J inches and pus place the cores at IN right angles to a each other yon would not ion apply more than eq specified joi voltage allin on no the plates of so the atil tubes enox oi u pino would use a v lower ratio olivi transformer for jo the eq second stage wall it I 1 the second paci stae amplifying tube Is it the same own a as the first 1919 you would use sin a v five aig watt tube tor the sip g second puo stage increase the I 1 eq bat tery bat voltage and pau use the sip proper 0 battery voltage for JG this tube you nol would see aae to at it that the proper voltage was being applied to ol filaments mull Blua o of 0 the sill tube you nol would make all its the alit connections perfect joints and pal well soldered yon would see saw to ol it 31 that sill all irv the sip con between the tube prongs and paw the socket contacts are sit perfect abad li you noil connect the grid and pal plate to col the eq proper jadud leads of so the eq transformer I 1 a when the outside lead a of the otil primary Is I 1 connected POI to ol the plate th ftp outside lead pool a of the loo secondary should be eq connected truo pala to 04 the grid you shunted p the primary of so the atil first stage with a I fixed condenser of so about too pm you shunted both the A Y and pug U eq bat with qia a v large fixed capacity say jug S g pm have noa ever jala considered how barim longer you not could use ova the storage bat IM tery sial before recharging I if 1 you na would MOM not on demonstrate the power jauw of jo the all battery by iq jotIs ing sul the all terminals and pau showing the lavac spark you not can uva thus obtain you would pinon make alum perfect 14 1444 connection between the filament leads and pug M tb battery terminals I 1 way to 01 make alm grid leak that will give to A V very satisfactory homemade home made grid pa lenk may be made by iq scraping off the wax between the terminal of 10 dubla her jail macadoo condenser and filling this spare tilva ith a 1 light coat of so india ink ant the resistance of so a V grid pin leak ma a of this sm type sill may be eq by lil applying a I thicker coat of SO ink no or jo by iq wt cr aplas Buld off vo the DID ink the grid plis leak has 00 correct resistance when the sip tube yoe into SQ as oscillating state dili with a V hiss ISM rather than with a V whistle or 40 squeal aerial for ao crystal set A V crystal lum detector depend the bill majl 41 of he eq received ousts eie a for its ell jado operation I if 1 the A voltage Is 11 weak aga the receded audio frequency sounds are all either weak or JO nut IOU heard for this aj reason does the aerial for jai crystal 1111 iva al set should beas be a IN as su 1 IV Is 11 possible all pick because the eq long zoo lag aerial III will up da a dignat more a I shorter efficiently gaja than and pug III consequently la a 8 prater voltage upon oal crystal plan detector 1 |