. QST . al ) tapped55^ turns from ground , I^ — Slug-tuned (CTC LS-3 5-Mc. coil).L3 —Slug-tuned (CTC LS-3 10-Mc. coil). slug- L5 — 25 turns No. 26 cnam. on %-inch. diar tuned form (ClC ).Note: See text for data on resonating slug-tuned coilsto proper frequencies. Inductance required depends onstray circuit capacitance and length of coax cable — Rotary switch, 1 pole, 3 positions, unused contacts shorted (Centralab PA-18 with PA-300 index. Use all spacers furnished to mount section near rear of index).Note: The choke in the oscillator cathode cir-cu
. QST . al ) tapped55^ turns from ground , I^ — Slug-tuned (CTC LS-3 5-Mc. coil).L3 —Slug-tuned (CTC LS-3 10-Mc. coil). slug- L5 — 25 turns No. 26 cnam. on %-inch. diar tuned form (ClC ).Note: See text for data on resonating slug-tuned coilsto proper frequencies. Inductance required depends onstray circuit capacitance and length of coax cable — Rotary switch, 1 pole, 3 positions, unused contacts shorted (Centralab PA-18 with PA-300 index. Use all spacers furnished to mount section near rear of index).Note: The choke in the oscillator cathode cir-cuit should be of the small type such as National R-33. 12 QST for Versatilize Your Oscilloscope Adding a Z-Axis Amplifier and Voltage CalibratorBY LYLE E. SHARPE,* W6FSC THE addition of a Z-axis amplifier and voltagecalibrator to any scope provides a usefulasset and is not a difficult job. The oscillo-scope pictured in this article is a Heathkit model0-7, but thf^ Pfimp tofhniquo may be applied to. • This article describes the circuitry andconstruction involved in adding a Z-axisamplifier and voltage calibrator to anyoscilloscope lacking these Z-axis amplifier may be used fortrace brightening, Z-axis modulation,or retrace blanking and. Mith the voltagecalibrator, the measurement of any wave-shape on the screen is available at theflick of a switch. Frout-puiicl \itw of the scope with the additionalcontrols. *% Engineering Dept., J. B. Rea Co., Santa Monica,Calif. MULTIVIBRATOR any scope, providing necessary space for mount-ing the parts can be found. In this case, very littlespace was available immediately behind the frontpanel, so two small subchassis were fabricatedand set back on the main chassis with extensionshafts run through panel bushings for the controlknobs. As shown in the front-view photograph,the added rows of controls are placed midwaybetween the existing controls with the voltagecalibrator on the left side, and the Z-axis am-plifier on the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915
