‰  NOW 15 WPM  ‰  TEXT IS FROM AUGUST 2008 QST  PAGES 33 AND 82  ‰

MULTIPLEXER TO SWITCH THE FILTER BETWEEN THE INPUTS AND OUTPUTS OF THE
MIXERS.  THE IF SIGNAL IS ROUTED TO THE CRYSTAL FILTER THROUGH ONE SECTION
OF THE 74HC4053 ANALOG SWITCH.  ANOTHER SECTION OF THE HC4053 ROUTES THE
OUTPUT OF THE CRYSTAL FILTER TO THE INPUT OF THE PRODUCT DETECTOR MIXER,
U5.  THE FILTERED IF IS MIXED WITH THE BFO, WHICH USES THE INTERNAL
OSCILLATOR SECTION OF THE MIXER, TO PRODUCE AN AUDIO SIGNAL.  DURING
‰  FROM PAGE 82  ‰
BN/373 JH1EIZ/342 DJ9ZB/359 JA4LKB/346 K4XP/351 N6OJ/354 VE7JO/340 W8CY/348
‰  END OF 15 WPM TEXT  ‚