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THE FFT VIEWS INCLUDE SUCH COMMON SPECTRUM ANALYZER FUNCTIONS AS AVERAGING,
SMOOTHING, MAX HOLD, PEAK SEARCH AND A MEASUREMENT MARKER.  RESOLUTION
BANDWIDTH CAN BE VARIED DOWN TO ABOUT 0R03 HZ TO DIG OUT THOSE SIGNALS
BELOW THE NOISE LEVEL AT THAT SETTING EACH DATA CAPTURE TAKES ABOUT 30
SECONDS, AND NOISE IS AVERAGED DOWNWARD DURING THAT TIME WHILE CONSTANT
LEVEL SIGNALS REMAIN UNCHANGED.  THE RESOLUTION BANDWIDTH IS DEPENDENT ON
THE SELECTED FILTER BANDWIDTH AND THE FFT SIZE.  WIDER BANDWIDTHS AND
SMALLER FFTS RESULT IN MORE RAPID DISPLAY UPDATES, BUT LESS NOISE
AVERAGING.  UNLIKE AN ANALOG TYPE OF ANALYZER, THE FFT DERIVED FREQUENCY
DATA UPDATES IN REAL TIME, SO YOU CAN SEE THINGS LIKE THE DYNAMIC CHANGE OF
SIDEBANDS ON AN AM BROADCAST STATION WHILE LISTENING TO THE MUSIC OR
ANNOUNCER.  THE VERTICAL SCALE IS MARKED ON THE LEFT SIDE OF THE DISPLAY IN
DBM DECIBELS RELATIVE TO A MILLIWATT AND THE FREQUENCY SCALE MHZ IS ACROSS
THE TOP.  IN TESTING IN THE ARRL LAB AT SEVERAL LEVELS FROM 30 DBM TO 130
DBM OVER A RANGE OF FREQUENCIES FROM HF THROUGH VHF, IT WAS FOUND THAT
THESE LEVELS WERE QUITE ACCURATE WHEN THE CALIBRATED SCREEN OPTION WAS
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Panoramaland ARC K7JAR KE7DSK 444 1 28 1,458 EWA Lockport ARA W2RUI 330 2
26 1,452 WNY Everglades ARC W4SVI 284 2 15 1,440 SFL Santa Barbara West Co
ARES W9EC 220 2 9 1,420 SB Saratoga Co RACES Assn WA2UMX 423 2 18 1,418 ENY
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