. QST . OR iT ilOOK (B) .; 6AK5,/26U8. 1 (c) Fig. 2 — Three circuits for use with overtone A, the simplest possible overtone circuit, is suit-able for use with crystals processed for overtone B introduces more feed-back, and may be usedwith fundamental-type crystals. The circuit at C is forobtaining high-order overtones with crystals that wereprocessed for 3rd-overtone use. It was sent in byW9MBI, who reports use of it for direct control at fre-quencies as high as 216 Mc. In all three diagrams, thetuned circuits are resonated at the frequency of thedesired over
. QST . OR iT ilOOK (B) .; 6AK5,/26U8. 1 (c) Fig. 2 — Three circuits for use with overtone A, the simplest possible overtone circuit, is suit-able for use with crystals processed for overtone B introduces more feed-back, and may be usedwith fundamental-type crystals. The circuit at C is forobtaining high-order overtones with crystals that wereprocessed for 3rd-overtone use. It was sent in byW9MBI, who reports use of it for direct control at fre-quencies as high as 216 Mc. In all three diagrams, thetuned circuits are resonated at the frequency of thedesired overtone. The grid circuit in C may be tunedwith a capacitor for greater range. must be made to increase and control regenera-tion. In addition to the circuits weve been usingfor several years there are variations such as theone shown in Fig. 2B. This circuit was first usedin QST through the courtesy of the Robert DollarCo. and W6EFT. The feed-back element here isthe smaller of the two capacitors connected be-tween the low side of the p
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915
