. QST . i e-inch metalplate, insulated from the chassis by ^.s-inchPlexiglas levers and threaded on the 8-32 pivotbolts. (Metal pivot blocks, tapped for 8-32, arebolted to the ^-inch Plexiglas.) The pivotbolts are secured to the key plate with nuts,as shown. The spring tension is adjusted bysliding the rubber band to an appropriate i)osi-tion. This method of supplying spring tensionabsorbs most of the sloppiness that might resultfrom too loose a thread fit in the pivot screws, acondition apt to arise from filing threads toeliminate During construction of the many miniaturizedmodels
. QST . i e-inch metalplate, insulated from the chassis by ^.s-inchPlexiglas levers and threaded on the 8-32 pivotbolts. (Metal pivot blocks, tapped for 8-32, arebolted to the ^-inch Plexiglas.) The pivotbolts are secured to the key plate with nuts,as shown. The spring tension is adjusted bysliding the rubber band to an appropriate i)osi-tion. This method of supplying spring tensionabsorbs most of the sloppiness that might resultfrom too loose a thread fit in the pivot screws, acondition apt to arise from filing threads toeliminate During construction of the many miniaturizedmodels preceding this one, it was found wise towire subcircuit by subcircuit, performance check-ing each subcircuit before going on. Nothing isso exasperating as finding a bonehead errorburied under three layers of resistors massedtogether with J^-inch leads. Ask me — I know! Trigger & Bias Adjustment The sole adjustment procedure consists ofrunning the bias up and down at R^ with variousline voltages between 80 and 135, to find therange of stable operation for each functionalcircuit. At each test setting, check over-all opera-tion and each circuit individually with a ,in accordance with the functional summaries.^Observation of circuit performance can be greatlysimplified by slowing things down to a walk /if. (metallized, to minimize leakage) shuntedacross Cl of Fig. 1, so that the needlestands still long enough to be read. Approximateexpected voltages are given in the circuit descrip-tion. Others are readily
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915
