. QST . ago, ^^ (iesorihed with a memory. which made itjKJSsible to send perfect code withoutperfect manipulation by the one stumbling block for some con-structors was the multiplicity of relaysused in the circuit, ^e are pleased topresent the all-electronic version, whichnot only eliminates the need for criticalrelays, but makes for still greater han-dling ease by the operator. The length of the article requires thatit be published in two parts. We departfrom custom in presenting the circuitaniitrelav can be eliminal<-<l. s|)eed-control leads in sejiarate shield
. QST . ago, ^^ (iesorihed with a memory. which made itjKJSsible to send perfect code withoutperfect manipulation by the one stumbling block for some con-structors was the multiplicity of relaysused in the circuit, ^e are pleased topresent the all-electronic version, whichnot only eliminates the need for criticalrelays, but makes for still greater han-dling ease by the operator. The length of the article requires thatit be published in two parts. We departfrom custom in presenting the circuitaniitrelav can be eliminal<-<l. s|)eed-control leads in sejiarate shielded and pairs. Speed-control lead capacitors should not exceed nLeach side of 750-/xh. chokes. The key-lead Rubber BandSprinq. Junction Fig. 2 — (A) Top view of a suggested tube-socket andcontrol arrangement for the Ultimatic key. Arrowspoint in direction of pin gap. (B) Details of the key-lever construction. The screws are 8-32. April 1955 13 b\-p;iss capacitors should make up the total 500ix/xL of C\3 and its corresponding capacitor on thedash side. Fig. 2A and a photograph show the top view ofa socket orientation providing optimum compo-nent dress, with resistors mounted on and be-tween the sockets. All No. 9 pins and centershields were removed to provide more room forparts. With the heaters connected in parallelfor operation, the No. 9 pins should bebent over and soldered to the mounting the series heater connection is used, theheater leads should be dressed very tightlyagainst the chassis, to minimize fields. Fig. 2B shows a side view of the key a cone pivot bearing is definitelysuperior, the threaded bearing pivots in thisunit proved surprisingly good, and they c
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915
