‰  NOW 20 WPM  ‰  TEXT IS FROM APRIL 2018 QST  PAGE 51‰

SEVERAL NOISE SOURCES.  JOE WAS ABLE TO NULL LINE NOISE BY 2 TO 5 S UNITS,
DEPENDING ON FREQUENCY AND LOCATION OF THE NOISE.  HE ALSO COMMENTED ON HOW
SHARP THE NULL IS.  ELENCO XP 720K WORKBENCH POWER SUPPLY KIT REVIEWED BY
PAUL DANZER, N1II N1II ARRL. NET  WHEN YOU FINISH ASSEMBLING THE ELENCO XP
720K KIT, YOU WILL HAVE A POWER SUPPLY FOR YOUR WORKBENCH THAT LOOKS AND
FUNCTIONS LIKE A COMMERCIAL PIECE OF EQUIPMENT.  THE UNIT HAS FOUR POWER
SUPPLIES INSIDE A HEAVY DUTY CABINET A POSITIVE SUPPLY VARIABLE FROM
APPROXIMATELY 1R25 TO 15 V AT 1 A MAXIMUM A MATCHING NEGATIVE SUPPLY 1R25
TO 15 V AT 1 A A 5 V SUPPLY AT 3 A, AND TWO FIXED OUTPUTS OF 6R3 V AC AT 1
A.  BOTH THE NEGATIVE AND POSITIVE VARIABLE SUPPLIES HAVE A COMMON RETURN
YOU CAN COMBINE THEM FOR A 2R5 TO 30 V SUPPLY, ASSUMING YOU DO NOT USE THE
‰  END OF 20 WPM TEXT  ‰  QST DE W1AW  ƒ