‰  NOW 30 WPM  ‰  TEXT IS FROM SEPTEMBER 2013  QST  PAGE 54‰

TUNE MY TRANSMITTER OUTPUT.  THEN, WITH THE COUPLER PLUGGED IN TO THE MB 1,
I ADJUSTED THE FWD TRIMPOT ON THE SIDE OF THE METER TO SET THE APPROPRIATE
POWER READING ON THE MB 1.  I HAD TO SWAP THE CABLES FROM THE COUPLER TO
THE MB 1 AND ADJUST THE REFL TRIMPOT IN THE SAME WAY.  I CHECKED THE
SETTINGS FOR SEVERAL TRANSMIT POWER LEVELS, BUT THATS ABOUT IT FOR
CALIBRATING THE MB 1.  WITH A LAB GRADE CALIBRATED VOLTMETER TO MAKE THOSE
MEASUREMENTS, IT MAY BE POSSIBLE TO OBTAIN EVEN BETTER ACCURACY.  YOU COULD
ALSO PERFORM THE ADJUSTMENT USING A CALIBRATED WATTMETER CONNECTED IN
SERIES WITH THE MB 1 COUPLER.  OUR TEST ENGINEER WAS QUITE IMPRESSED WITH
THE ACCURACY OF THIS METER CONSIDERING THAT I BUILT IT FROM A KIT AND
CALIBRATED IT WITH A COMMON VOM SIMILAR TO WHAT MOST AMATEURS MIGHT HAVE AT
HOME.  OF COURSE WE COULD HAVE ADJUSTED THE MB 1 TO EXACTLY MATCH POWER AND
SWR MEASUREMENTS FROM THE LABS TEST SETUP.  IN REVIEWING THE LAB NUMBERS
AGAIN AS I COMPLETE THIS REVIEW, I WONDER IF WE MIGHT HAVE ACTIVATED THE
BAND CORRECTION FEATURE FOR THE 10 METER TEST.  INFORMATION FROM THE
MANUFACTURER INDICATES THAT THEIR TESTS WITH AN NIST CERTIFIED POWER SENSOR
‰  END OF 30 WPM TEXT  ‰  QST DE W1AW  ƒ