Show of amplification known a chok coll pi iron cor chok coll in pile of amplifying audio amplification be obtained tn n number of different wn one of which ij honn in the diagram it li a radical from the haual trani funner type of audio and ie laid to be extremely clear lo 10 iti ability to reproduce made ind voice the builder dot not hare to go to the of buying an audio and anre the of till worrie wor rif ahli type of ie known tl choice coll ai it ploy a ample iron core choice coll in place of the thi choke coll may of the arry of bell ringing trant fonner bort any will do as they rr nith the ame number of torn to work on the llo rolt A 0 circuit the Ingen lou experimenter will find that good be from the secondary econ dary of an automobile perk coll which li lipped over an iron core the market 10 lo afford an assort anent of choke coll if the experimenter blahe te purchase pur chaee them alie cir mounting easily made and quite by W H herein a combination bearing and mounting for a borne made or ario coupler which can be built very easily and will prove quite efficient the ketch ii elbex placatory but a of the mounting may helpful A Tarl ometer or varlo coupler light in weight preferably nade of thin tubing or cardboard be tiled in conjunction with this mounting the mounting conoleta con tleta or inch brae tube about 2 binche long with an inside diameter large enough for inch bran rod to rotate freely anilde ahli rod to be about 1 binche longer than the tube the tube should be threaded at both ends for about of an inch bran waher hould be threaded to alt the inch tube A nut and a plata haeher are now placed on one end of the tube and the tube 1 inserted through the panel from the FT mounting Vari omitT or vario couplers only one hole in rear through a inch hole the threaded hould be screwed on the projecting tube 19 that the end la fluch with the face of the wah er the cat on the inalda ti now and the tube li rigidly held at right analei to the other end of the tube with the primicy of the or coupler between them but theae are not tightened until the ee condary t in place to mount the ee condary the rod la inverted in the tube from the and the secondary econ dary fattened on it be kwea twp nuta ther secondary econ dary can be centered la the primary by the annta on the tube backward or forward when the correct petition li found nuta are A cian li made of a piece of U anch tube inch conr to be oa the rod 0 o a standard itan dard dial may be employed ahta bathing hould hare li mall hole drilled one aide the dial et crew may be fait ened on the rod beneath Iladio new how your radio set I 1 improved though the et now la oie may be adolef rood work both 00 local ita and distant tationa ta tlona there li alray room for begia filby at the firt part that one for the of inal we will fo on down thresh th line aunce atef when he et may be improved to amk aa extent that aul wul be 1 6 better and edwa wm bea ft met A borce te u beet cult in tin nit to the freche but it not anwen ary to employ alili circuit nath clink coll it will work mil mith almost nicy fyie of cir cult A jack li chown to the end circuit two tope of alile be asid if and bo atred up juit alic ai ade ferit tica A 1 hiim teler lione if chown in with the rid of the tube thi ie ai it will keep the goltara arora 1 applied to the arid th choke coll li hunted nith a mica condenser thi capacity will depending upon the impedance of the coil A erid leak connected between the grid of the amplifier tube and the nei cathe of the A battery Is aleo required who build ahli circuit may fand that it does not produce bolt the volume of the high ratio amplify ng but will agree that it gitch a much better quality of tone on the musical number and the bocal election today that Is the type one should use of ahli material be about four or ore inches long look over the lead in wire de eure that it li soldered and that there ie oo 00 chance for it to break from a train if there are other aerial oo 00 the roof try and get yours in a position aher it Is at right entice to most of that are it for efficiency the lead in wire bould be at least anre hinchee away from the wall of the bouse the ground connection should be made to water pipe the most efficient way to do this Is to first clean the pipe wrap tinfoil tightly around the cleaned area and then put the ground clamp on solder the lead from the set to the onto the clamp do not rely on a bolt to a connection in the primary of the tuning cill eliminate as much wire as possible if the coupler Is one that responds to meters take off all the wire that Is not used when rec elTing some high wave station euch as the secondary of the tuner should be one having as much alre as possible that Is of course if the tuner Is a varlo coupler the reason for this Is that the more inductance the higher the grid voltage that my be obtained la crystal bets the tame holds true all the condefer con dener in the circuit may be improved by taking hem off the and pig tailing them to do this older a wire to the shaft of the rotary plates and use the end of this wire should be flexible as the rotary con the fixed condenser to the circuit each r th grid and phane con denier should be of raged con and bare mica dielectric variable rid deaki are beldom aid to warrant taking a chance retting an inferior one and hare it make disturbing noises in the audio frequency amplifier us hai been aid many times before uie a 0 battery of bout four bolte or hither this will clear op the to degree AIO the drain on the batterley batt erlei I 1 lowered to al gnott one fifth of the former drain without the 0 battery it 1 beldora that the ratio of the trani formen make enough difference to warrant pending eitra money on a change final word look the et carefully and we whether a lead kiy be made if by 1 acme bit of apparatus a fid or plate lead can be made without length enan another lead chance it ai the increate In creale in li worth the time what you are mining by not knowing code there la come inc acutt in the air down atlow the length med by the kloweit of the ifie no use to kliten down there until 10 50 p or later bebau the amateur 99 per cent of them keep off the air dor laef houra from 11 oo 00 however if jou do not read code there 1 acme amateur phone traffic oa and lower find U extremely chirp and care in tuning too bebin to what you are by not knowlta the code if ao you can ret i chart of the code and coall find plenty of opportunity for practice in reading any after 11 if yog tone diwa to abe iaeger band |