100-Radio-Hookups-EICO-1924

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100 RADIO HOOK-UPScases there may be another wire, or branch so to speak,from between a connection, leading to some other terminal.This is usually termed a common connection (beingconnected to two or more instruments). Many of theseare found in vacuum tube hook-ups.How to Connect Up the InstrumentsMany mistakes are made in the wiring of a receivingset. These in most cases are due to the complication ofwiring, the following of which requires more than usualcare. It is suggested that the circuit to be used be tracedwith pencil on to a sheet of paper. Starting from themost convenient point in the hook-up, connect one wireat a time, and for each wire connected, go over it withink on the diagram and give it a number. It becomes an. easy matter then to check up on all connections made.The going over of each connection after the set has beencompletely wired is recommended. A mistake may causeconsiderable trouble later.Don't attempt to use a complicated hook-up at first.Be content with a small outfit until you master it. Afteryou look over the diagrams in this book, select the instrumentsso that those in your first set will be of usewhen you branch out to a bigger lay -out.The best arrangement for the various instruments composingthe receiving set is exactly as they are positionedin the diagrams. This arrangement allows for the shortestpossible leads from one instrument to another, whichis a decided advantage.Concerning TubesThere are a number of different types of vacuum tubeson the market today, some of which are cesigned for adefinite function, and others which are well suited for avariety of functions. Poor results are often due to theuse of the wrong type of tube.For detectors and regenerators any one of the followingtubes can be used. Radiotron U.V. 200, CunninghamC 300, Western Electric VT 1 (J tube), or Westing -12
100 RADIO HOOK-UPShouse WD -11. The Radiotron U.V. 201, Cunningham C301 or the Western Electric VT 2 function well as detectorsand regenerators if a "B" battery of about 40volts is used instead of the usual 221/ volts.For audio frequency amplifiers the Radiotron UV 201,UV 201-A, Cunningham C 301, C 301-A, and the WesternElectric VT 1, VT 2 and 216-A are all well suited. TheWestinghouse WD -11 can be used also, if excessively high"B" battery voltage is not employed. About 45 volts R`B"is correct for this tube.For radio frequency amplifiers the VT 1, UV 201, C301 and the WD -11 are probably the best tubes to use.The UV 201-A, C 301-A and VT 2 can also be used butthey are not quite as efficient as the others for thispurpose.When audio frequency power amplification is desireduse either a Radiotron UV 201-A, C 301-A, VT 2 or a216-A. These tubes have a higher amplification constantthan the others and much higher "B" battery voltagescan be used.All of the above mentioned tubes, except the WD -11,require a six volt storage battery to supply the necessarycurrent for lighting the filaments. The WD -11, however,requires only a 11/2 volt dry cell.CRYSTAL HOOK-UPSFig. 1. A crystal circuit employing a one slide tuning coilwhich will give fair results for local receptions. Fig. IA is anadaption of this circuit to a coil which is not tapped or providedwith a slider. In this case the wave length range is controlled bya variable condenser.13
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Page 3 and 4: THE EXPERIMENTER'S LIBRARY, No.100
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Page 9 and 10: 1100 RADIO HOOK-UPSSYMBOLS USED IN
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Page 39 and 40: 140 RADIO HOOK-UPSREFLEX CIRCUITSFi
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