Show vill no lot 10 sees X w edited by U G glagla zeltor 0 of radio to ID grit beom V 7 ono 77 7 75 7 condenser cef opiate aube i 7 uh W aa 7 1 M sade 70 A IN P fiory 1 4 1 secondary 60 f 0 turns J turns p L w e ary ar y 0 conns afons oa 4 I 1 detail details and connection connections of the tuning unit by JOHN H I 1 for the radio fans who have built sets ct and I 1 know that they are now wishing they had tied ex banded a little further and made the popular honeycomb or varl ometer set this AWs article Is I 1 written AJ As you have found out the tingle single circuit st set while riving giving louder signals also lio brings in interference the main reason teason you built your single circuit set was that it aas as inexpensive now I 1 feel eel ure sure there are many fani fans who aice ke myself have been trying to reduce interference to these fans I 1 offer the results of my experiment yoa you can alter your present ingle single circuit receiver very catly eastly by just substitute ing the new toning tuning arrangement looking at the diagram you will notice that the circuit in almost identical with the usual honeycomb circuit L a primary secondary and tickler and jet et the whole thing Is nothing more than a varlo coupler A description at this time Is I 1 therefore not crot out of place A tube of in bating compound or cardboard 4 inches la in diameter if it the latter it should be well shel lacked li to obtained and d borne some no 24 D S Q wire wim the be will need to be about 7 inches long starting from one end make a hole for a 4 binding pot post U inch down and commence winding from the post after winding 20 turns make another hole bole for the binding post this completes the primary no to tapa taps are re leaving ct of an inch make pother bole hole and start winding the le condary wind 00 turns and tap every tenth turn turns this complete completes the secondary econ dary the tickler Is to the usual wooden ball and Is wound with 80 36 junu of wire IS 18 on an each side aide now place the tickler tn in the tube the ball should rotate between the primary and secondary condary ee turns and the small sketch will further make this understood after the tickler la Is placed in the tube fl fitall fit it all tube socket i make makes changing easy fasy there ar are to many kinds of tubes BOW now on th the market the bases of aich are re of different dzeiak aitt that it I 1 li Is necessary to corine connect ct up a new now socket whenever it li Is desired to change bubea tub the ue drawing bow shown a socket which will hold bold any tube simply insert the tube so that the tin 1 fits la in the little hole on the back part pw of the thea then tighten up tir the thumb nati nuts until the tube 1 Is w all arx a op I 1 an Ingon laus form of vacuum tube socket particularly for ex purposes eee it WAI fit all the and C am cure connect the flexible fiez ible cord cords with the mall small spring cups to their proper prongs a on the tube according to the marked binding po poa the front of the socket the ketch shows how bow they are connected bach such a socket makes changing tubes easy make ano a more hinding pot post holes it in the tube between primary and nw get andary for tickler connection connections hill ilits make makis lie the whole hole tuning arrangement eom complete after drilling you can the hook up color each circuit as it Is wired fred and no mistakes will follow I 1 do not think I 1 need explain turtle Lr r if it your skill has ha been to produce your single circuit you will hare have no difficulty with thi this one just a little word of caution I 1 have found that on oil mot most receiver receivers the email small fixed condenser shunting phone or BI battery li to omitted this circuit ft til positively not oscillate properly it if this thi condenser con denier Is not included the antenna I 1 now have li Is about feet X A M T I 1 dealt 0 1 circuit diagram for the tuning unit described long and I 1 find end the SO 20 turns on the primary quit quite cleat for wave waves from to about meters the primary condenser conde neer ti Is in series erie with the round ground and not hunted shunted across the primary this to me seems mi a little better than the usual hunt shunt I 1 also find that t the secondary condary ee condenser conde neer Is very sharp in tuning and that the primary condenser acts as a vernier I 1 would ad rise vise the use of a vernier 1 condenser in the secondary but for or the primary it la Is not necessary tiec essary news range of reception Is greatest over water the ranee range of transmitting and receiving ceiling radio meales depends upon the nature of the territory lying between the transmitting and the receiving stations the greatest range for or a given power being obtained over water any metal particularly iron or steel lying between the stat stations lons will cause lou loss of signal strength th such metal may either be in the forro form of artl artificial Acial structures cuch such as a building framework frameworks or tin roof roofs or may be in the form of ore deposit deposits some ro region of the country an are noted for their poor location for radio reception in many places it Is I 1 possible po elble to receive effectively from all direction directions but one and it is I 1 usually found that in thi this direction a 1 metallic structure or metal deposit 4 I 1 oble for the lack of pf reception good indoor antenna coiled into spiral A new now type of indoor antenna which rivals the loop can be bj made in a too mo meat ment with nothing more than feet of wire the wire la to colled into a loot long spiral and suspended ins by one end number 20 or IS 18 Lasu insulated wire world works well although many other kinda kinds are an quite as rood good heavier wire being in general better thin light wire wim wind WIM the coll cou on any convenient tube 2 aus upend it from a window and it will rival an outdoor Ik erial it cannot be count ed upon to give ITC re aralts with a crystal let set but li Is practical for any kind of vacuum tube receiver it lat almost alway always better than beds piano or wire about the rwal I 1 radio digest the this tro bieve Dist distante anoe dt dj akrep here Is ats ideal baby receiver Rel vr for simplicity of and jol alt asoy ey of control its if the king of the air and four aasel ac en an DX it will bring in lo leion wl with on one fort feet md with the th othor all at t oni one if 7 vw fth M 84 fr with wilk the th sills in a calit ca TM the cihat it Is a marme tuner fw ur ott h loud her mch anute 0 VM we W H only li buunk laun mal it for A |