‰  NOW 30 WPM  ‰  TEXT IS FROM MAY 2015 QST  PAGE 33‰

VOLTAGE USING THE ORIGINAL VOLTMETER INPUT.  I DESIGNED THE RF DETECTOR FOR
A MAXIMUM 34 V PEAK ACROSS THE CAPACITOR.  THAT CORRESPONDS TO AN RF POWER
OF OR NEARLY 12 W.  THIS IS A USEFUL VALUE FOR LOW POWER OPERATIONS.  THE
PICAXE RF POWER PROGRAM SQUARES THE DECIVOLT READING, ADJUSTS DECIMAL POINT
TO READ MW, AND MULTIPLIES BY 4 TO GET MW DISSIPATED IN THE 50 LOAD RL.  I
USED THE SAME 11 LEDS AS IN THE VOLTMETER, BUT NOW THEY DISPLAY POWER
LEVELS FROM 1 TO 11 W IN 1 W STEPS.  THE LEAD PHOTO SHOWS THE LED
ARRANGEMENT ON THE ENCLOSURE.  THIS SIMPLE HARDWARE INSTRUMENT SHOWS HOW A
MICROCONTROLLER CAN BE USED TO PERFORM MEASUREMENTS, AND THE ARITHMETIC
NEEDED TO PROVIDE A MEANINGFUL INDICATION USING A BASIC PROGRAM.  MY
PROGRAM LISTING IS AVAILABLE ON THE QST IN DEPTH WEB PAGE.  AMATEUR EXTRA
CLASS OPERATOR MERT NELLIS, W0UFO, WAS FIRST LICENSED AS W9UFO IN
NASHWAULK, MINNESOTA, THEN AS W8CNC IN EAST LANSING, VIRGINIA BEFORE HE
OBTAINED HIS CURRENT CALL SIGN.  HE RECEIVED A BSEE DEGREE FROM IOWA STATE
UNIVERSITY, THEN AN MSEE FROM MICHIGAN STATE UNIVERSITY AND IS A REGISTERED
PROFESSIONAL ENGINEER IN MINNESOTA, WORKING IN MAGNETIC AND INDUSTRIAL
‰  END OF 30 WPM TEXT  ‰  QST DE W1AW  ƒ