. QST . ot cuts off on —13 volts from RsaRz2- R2SR29rises to -1-12 volts to pass the dash selection toVn- Conduction in Vn establishes -|-10 volts atR25 for a dash on the next positive time-basepulse, and drops Ri^R^o to —7 volts to lock outany new dot selection made before the dashstarts. The reverse transfer actions are obtainedthrough circuit symmetry. With their interlocks and activation circuits,7io and Fii comprise effectually a tri-stable sys-tem. Either one or the other tube may be con-ductive, but never both. However, both tubesmay be nonconductive. The three conditions cor
. QST . ot cuts off on —13 volts from RsaRz2- R2SR29rises to -1-12 volts to pass the dash selection toVn- Conduction in Vn establishes -|-10 volts atR25 for a dash on the next positive time-basepulse, and drops Ri^R^o to —7 volts to lock outany new dot selection made before the dashstarts. The reverse transfer actions are obtainedthrough circuit symmetry. With their interlocks and activation circuits,7io and Fii comprise effectually a tri-stable sys-tem. Either one or the other tube may be con-ductive, but never both. However, both tubesmay be nonconductive. The three conditions cor-respond to selection of dot, dash, and spacingcharacters. Bj^ itself, this structure guaranteesthat a given character will be held in storage if anopposite t>pe character(s) has been priorlyselected, and it will not be released until thatprior character(s) has Ikhui transmitted. Cs and Cg delay the rise of sequencor cathodevoltages. When control is transferred from one (Continued on page 1^4) 122. <^<^<h<^<^<^<^<^ vt> vP M> tali Hemu $ $ $ 0^ FOR ^ TOP-DOLLAR^ * * *$TRADE-INS JmNG RANGER TransmitterExciter Kit n79 50 Immediate available wired. Boilt-in VFO-TVI Sup-pressed — Band-switching— seven bands —75 WattsCW lnput-65 Wattsphone input. Offers morefeatures than any Trans-mitter/Exciter ever builtfor amateurs!
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915
