‰  NOW 40 WPM  ‰  
SHORTAGE OF HANDS.  TENTH OF AN INCH PIN SPACING AND 1/8 W RESISTORS
REQUIRE NOT ONLY FIVE OR SIX HANDS, BUT ALSO WELL AIMED LIGHT AND
MAGNIFIERS TO SEE WHAT YOU ARE DOING.  TO HOLD A PC BOARD, YOU CAN USE A
THIRD HAND CONSISTING OF A WEIGHTED BASE AND CLIPS ON MOVABLE ARMS.  MANY
AMATEURS USE A LARGE DESK LAMP FOR ILLUMINATION, AND PERHAPS A LARGE
MAGNIFYING LENS ON AN ARM TO ALLOW BETTER VISIBILITY OF TINY COMPONENTS.
THE MAGNIVISOR DELUXE CP 60 FROM CARSON 

PACIFIC ANTENNAS WEBSITE.  THERE IS A CHECKLIST OF PARTS, ALONG WITH
ILLUSTRATIONS AND DESCRIPTIONS TO HELP IDENTIFY EACH ONE.  COMPONENTS ARE
SPACED A BIT TIGHTER THAN THE RECEIVER, AND THE RESISTORS ARE POSITIONED
FLAT ON THE BOARD.  THE MANUAL INCLUDES PICTURES OF THE ASSEMBLED KIT, THE
BOARD WITH ONLY RESISTORS MOUNTED, AND THE BOARD WITH RESISTORS AND
CAPACITORS MOUNTED.  ALTHOUGH THE PARTS ARE CALLED OUT AND CLEARLY SHOWN ON
THE BOARD, I FOUND IT HELPFUL TO PHOTOCOPY THE BOARD WITH 200 ENLARGEMENT
TO MORE EASILY LOCATE WHERE TO PLACE PARTS.  THERE ARE SEVERAL COMPONENTS
THAT HAVE ONE LEAD SOLDERED TO THE GROUND PLANE.  TO MAKE THIS CONNECTION,
THE BOARD USES A VERY SMALL BARE COPPER PAD AND CARE MUST BE TAKEN THAT
YOUR SOLDER MELTS TO THESE SMALL PADS.  EVERYTHING FITS NEATLY WITH A
LITTLE EXTRA PUSHING TO MOUNT THE TWO VARIABLE RESISTORS.  WHEN PLACED
PROPERLY, THEY CLICK INTO THEIR MOUNTING HOLES.  THE FILTER WORKS AS A
WINDOW  IF YOU USE A MODERN RECEIVER OR TRANSCEIVER, AT TIMES YOU PROBABLY
REDUCE INTERFERENCE FROM AN ADJACENT SIGNAL BY ALTERING THE PLACEMENT OF
THE SIDE OF THE SELECTED FILTER USING PASSBAND TUNING OR A SIMILAR CONTROL.

TODAYS KIT PACIFIC ANTENNA DEVELOPED THE EASY AUDIO BANDPASS FILTER KIT AS
A COMPANION TO THE 40 METER EASY RECEIVER KIT REVIEWED IN DECEMBER 2016
QST.  THE RECEIVER BANDPASS IS QUITE BROAD, AND SOME SORT OF FILTERING IS
USEFUL FOR SEPARATING SIGNALS ON THE BAND.  THE KIT ALSO INCLUDES AN AUDIO
AMPLIFIER THAT WILL DRIVE HEADPHONES OR A SPEAKER.  FIGURE 6 SHOWS THE
ASSEMBLED KIT.  IT CONSISTS OF A 2N5088 BJT BIPOLAR JUNCTION TRANSISTOR
INPUT STAGE WITH A 100 RESISTOR AS THE LOAD TO THE AUDIO SOURCE.  THE NEXT
STAGE USES A LF356 OPERATIONAL AMPLIFIER IN A STANDARD FILTER CONFIGURATION
VERY CLOSE TO THAT SHOWN IN SEVERAL EDITIONS OF THE ARRL HANDBOOK.  THE
PASSBAND IS A FIXED VALUE, SPECIFIED AT PPROXIMATELY 500 HZ.  THE CENTER
FREQUENCY IS VARIABLE OVER 300 HZ TO 2 KHZ, WITH A POTENTIOMETER
CONTROLLING THE BANDPASS LOCATION.  FOLLOWING THE FILTER STAGE IS A VOLUME
CONTROL AND A CONVENTIONAL 386 AUDIO INTEGRATED CIRCUIT.  IT HAS ENOUGH
POWER TO DRIVE A SMALL SPEAKER.  FOUR SETS OF COPPER PADS PROVIDE
CONNECTIONS TO THE INPUT, OUTPUT, AND SUPPLY VOLTAGE 9 12 V DC.  AS WITH
THE RECEIVER KIT, ITS UP TO THE BUILDER TO PROVIDE AN ENCLOSURE IF DESIRED.
PUTTING IT TOGETHER ASSEMBLING THIS KIT IS VERY SIMILAR TO ASSEMBLING THE
40 METER EASY RECEIVER.  FIGURE 7 SHOWS THE KIT COMPONENTS AND PC BOARD.
THE MANUAL WITH FULL INSTRUCTIONS IS AVAILABLE AS A PDF FOR DOWNLOAD FROM
‰  END OF 40 WPM TEXT  ‰  QST DE W1AW  ƒ