‰  NOW 20 WPM  ‰  TEXT IS FROM JULY 2018 QST  PAGE 44‰

THE SAME MIXER USED IN THE ELECRAFT K3 TRANSCEIVER.  THE MIXER IS FED BY A
LOW PHASE NOISE, TEMPERATURE COMPENSATED MEMS MICRO ELECTROMECHANICAL
SYSTEM LOCAL OSCILLATOR RUNNING AT 1R33 MHZ, PUTTING 472 479 KHZ CONVERTED
SIGNALS IN THE 160 METER BAND 1R802 1R809 MHZ.  VARIOUS LOW PASS AND BAND
PASS FILTERS ARE USED ALONG THE SIGNAL PATH, INCLUDING A SEVEN POLE, 500
KHZ LOW PASS FILTER LPF IN THE FRONT END.  OFFENDING AM BROADCAST BAND
SIGNALS ARE ATTENUATED UP TO 50 DB, WHICH IS ESPECIALLY BENEFICIAL FOR
STATIONS LOCATED IN A DENSE MEDIUM WAVE BROADCAST SIGNAL ENVIRONMENT.
AFTER MIXING, IF SIGNALS ARE FED TO A LOW NOISE, ULTRA LINEAR OP AMP DURING
RECEIVE PERIODS, PROVIDING 6 DB CONVERSION GAIN.  A 20 DB ATTENUATOR CAN BE
ENABLED, WHICH IS ADVANTAGEOUS IF USING A TRANSMIT ANTENNA FOR RECEIVE OR
‰  END OF 20 WPM TEXT  ‰  QST DE W1AW  ƒ