. QST . panelshave J^-inch hps folded over so that the per-forated aluminum sheet (Rejnolds do-it-jour-self material now available in most hardwarestores) for the shielding can be secured ^vithsheet metal screws. In our case we completed allthree cabinets (all holes drilled and punched)and then, after assembling them, sprayed themwith grey wrinkle enamel. Baking under some in-frared heat lamps finished the paint job. Next,Tekni-Label decals were appUed and the resultwas a professional-looking job. On the transmitter chassis the speech amplifiertubes are across the rear, separated bj^ the mod-u
. QST . panelshave J^-inch hps folded over so that the per-forated aluminum sheet (Rejnolds do-it-jour-self material now available in most hardwarestores) for the shielding can be secured ^vithsheet metal screws. In our case we completed allthree cabinets (all holes drilled and punched)and then, after assembling them, sprayed themwith grey wrinkle enamel. Baking under some in-frared heat lamps finished the paint job. Next,Tekni-Label decals were appUed and the resultwas a professional-looking job. On the transmitter chassis the speech amplifiertubes are across the rear, separated bj^ the mod-ulation transformer from the The cr>staloscillator is in the center of the chassis and thefinal amplifier is toward th^^ front panel. The an-tenna relay is j .st behind the antenna loadingcondenser. The two coax cables from the connectors on therear panel run to a bracket just behind the of these goes to the antenna and one to theconverter. Because of lack of space in the unit, the. CORD & PLUG BATT. Fig. 4 — Power-supply unit. Capacitances are in /if. CiA, CiB — 20-Aif. 450-voh electrolytic (Mallory FP434,with lO-ixt. units paralleled. Can must be in-sulated from chassis). Ri — 200 ohms, 25 watts, adjustable; set to 166 ohms. CRi, CR2 — Selenium rectifiers; see text. Ji ■— 8-contact connector, chassis-mounting (octal). J2 — 12-contact connector, chassis-mounting (Jones). Pi, P2 — 12-contact connector, cable-mounting (Jones). Si — 2-pole 6-po8ition wafer switch. S2, S3 — toggle. Ti — Combination power325 V. at 135 ma.; v. at and 117 v. ). El — Vibrator (Mallory type 294). transformer,amp.; 6-8 v.(Thordarson September 1955 27 meter and the meter switch are both locat-ed inthe power supply and a 12-wire cable intercon-nects these two units. The meter shunts, how-ever, are in the transmitter. These must be tail-ored to fit the particular meter. The vibrator and the filte
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915
