. QST . complication, and when selectivityis achieved, oscillator instability is likely to besomething of a headache. A glance at the blockdiagram, Fig. 1, will show how these matters arehandled in the CD-2. The receiver uses ten tubes. The front endhas a 6BK7 series cascode, for low noise figure,followed bj a 6AK5 pentode. Self-tuned coupledcircuits are used between the second half of thecascode and the 6AK5 grid, and between the6AK5 plate and the first Coupling betweenthese circuits is adjusted to give the desiredflat response across the band, and the seriesof circuits gives reasonab
. QST . complication, and when selectivityis achieved, oscillator instability is likely to besomething of a headache. A glance at the blockdiagram, Fig. 1, will show how these matters arehandled in the CD-2. The receiver uses ten tubes. The front endhas a 6BK7 series cascode, for low noise figure,followed bj a 6AK5 pentode. Self-tuned coupledcircuits are used between the second half of thecascode and the 6AK5 grid, and between the6AK5 plate and the first Coupling betweenthese circuits is adjusted to give the desiredflat response across the band, and the seriesof circuits gives reasonably high attenuationof signals outside that band. Oscillator stabilityis assured through the use of a voltage-regulatedoscillator-doubler arrangement, with a self-tuneilcircuit in the doubler plate lead, and very lightcoupling between the oscillator and doubler. Output from the first niLxer is at ^NIc,and there is one stage of amplification at thisfrequency. Then follows a 6U8 mixer-oscillator,.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915
