=  NOW 30 WPM  =  TEXT IS FROM FEBRUARY 2023 QST  PAGE 42 =

QST IN DEPTH FOR DETAILS.  TUNING POWER WAS SET AT 5 W, PER XIEGU
RECOMMENDATIONS.  ALL MEASURED LOSSES ARE SUBJECT TO THE 3 ACCURACY OF MY
NIST TRACEABLE TEST EQUIPMENT.  THE XPA125B TUNING RANGE IS SPECIFIED AT 14
500 RESISTIVE, THOUGH LAB NOTES XIEGU XPA125B 1R8 50 MHZ 100 W AMPLIFIER
THE XIEGU XPA125B AMPLIFIER PRESENTED QUITE THE CHALLENGE FOR THE ARRL LAB
TO TEST.  WE HAD ORIGINALLY OBTAINED A SLIGHTLY OLDER VERSION OF THIS
AMPLIFIER.  IT WORKED WELL ENOUGH, EXCEPT FOR THE PROBLEM THAT THE RF POWER
OUTPUT WAS LOW ON THE UPPER BANDS.  THIS MIGHT NOT HAVE BEEN A PROBLEM IN
AND OF ITSELF, BUT WHEN WE PUSHED IT HARD TO GET CLOSER TO THE RATED POWER,
THE TRANSMIT IMD PERFORMANCE WAS NOT GOOD AT ALL.  WE THEN FOUND THAT XIEGU
HAD A NEW AND IMPROVED VERSION OF THE AMPLIFIER, SO THE EDITORS DECIDED TO
REVIEW THE NEW UNIT.  WHEN WE RECEIVED THE NEW VERSION, WE SAW THE SAME
PROBLEM WITH POWER OUTPUT ON THE 10 AND 6 METER BANDS.  WORSE, THIS UNIT
DID NOT MEET THE FCC LIMITS FOR SPURIOUS EMISSIONS ON 6 METERS.  WE HAD
PURCHASED THE AMPLIFIER THROUGH HRO, SO WE CONTACTED THEM.  HRO IMMEDIATELY
AGREED TO EXCHANGE THE AMPLIFIER FOR US.  THE REPLACEMENT ARRIVED PROMPTLY.
=  END OF 30 WPM TEXT  =  QST DE W1AW  <