=  NOW 25 WPM  =  TEXT IS FROM FEBRUARY 2023 QST  PAGE 42 =

IT WAS A BIT LOW ON POWER ON THE UPPER BANDS, BUT NOT AS BAD AS THE OLDER
VERSION HAD BEEN.  BUT THE UNIT WOULD NOT GO INTO TRANSMIT ON 80 METERS AND
DISPLAYED A LOW EFFICIENCY ERROR MESSAGE.  AGAIN, HRO IMMEDIATELY AGREED TO
HELP, AND WE SOON HAD A THIRD UNIT.  KUDOS TO HRO FOR ITS EXCELLENT
CUSTOMER SERVICE.  LIKE THE PREVIOUS TWO AMPLIFIERS, THIS AMPLIFIER, AGAIN,
DID NOT MEET ITS POWER OUTPUT SPECIFICATION ON BOTH THE 10 AND 6 METER
BANDS SEE TABLE 1.  THE HARMONICS ON 6 METERS DID NOT MEET THE FCC LIMITS
FOR SPURIOUS EMISSIONS.  IF THIS AMP IS TO BE USED ON 6 METERS, AN EXTERNAL
FILTER MUST BE USED.  THE TRANSMIT IMD, MEASURED AT FULL AVAILABLE POWER ON
ALL APPLICABLE BANDS, WAS MARGINAL, BUT A NOTICEABLE IMPROVEMENT WAS
OBSERVED WHEN THE OUTPUT POWER WAS REDUCED TO AROUND 80 W SEE FIGURES B AND
C.  IF USERS OF THIS AMPLIFIER WANT TO BE GOOD NEIGHBORS ON THE BANDS, ON
SSB IT IS BEST TO THROTTLE THE OUTPUT BACK FROM FULL POWER TO ACHIEVE THE
=  END OF 25 WPM TEXT  =  QST DE W1AW  <