‰  NOW 13 WPM  ‰  TEXT IS FROM OCTOBER 2012 QST PAGE 98  ‰

TWO VERY HIGH Q TUNED CIRCUITS OF THIS I.F.  TRANSFORMER CONTRIBUTE ABOUT
AS MUCH SELECTIVITY AND ALMOST AS MUCH REPEATER GAIN AS TWO ORDINARY AIR
CORE I.F.  TRANSFORMERS WOULD.  BUT HERE AGAIN REGENERATION IS USED TO
INCREASE GAIN TO ANY DESIRED DEGREE, AND SELECTIVITY UP TO SINGLE SIGNAL
PROPORTIONS WHERE IT IS IN TERMS OF CYCLES, NOT KILOCYCLES.  THE FIRST
SECTION OF A 79 DUAL TRIODE IS USED AS THE REGENERATIVE SECOND DETECTOR.
REGENERATION IS PROVIDED BY CONNECTING THE I.F. TRANSFORMER SECONDARY
ƒ  QST DE W1AW  ‰
BETWEEN GRID AND CATHODE, WITH THE IMPEDANCE OF R.F. CHOKE L1 BETWEEN
CATHODE AND B, OR ITS PLATE RETURN.  THIS MAKES A CONVENTIONAL OSCILLATOR
CIRCUIT, OSCILLATION AND REGENERATION BEING CONTROLLED BY RHEOSTAT R2
SHUNTING L1.  THE SECOND TRIODE SECTION OF THE 79 TUBE IS THE AUDIO
AMPLIFIER, RESISTANCE COUPLED TO THE FIRST 79 TRIODE SECTION SECOND
DETECTOR, AND TERMINATES IN THE TIP JACKS FOR HEADPHONES.  A MAGNETIC LOUD
‰  END OF 13 WPM TEXT  ‰  QST DE W1AW  ƒ