=  NOW 35 WPM  =  TEXT IS FROM NOVEMBER 2020 QST  PAGE 50 =

EXP RISE AND EXP DECAY ARE A SET OF PULSES.  EXP RISE HAS AN EXPONENTIAL
LEADING EDGE ON THE PULSE AND A RAPID RETURN TO THE BASE VALUE FAST FALL
TIME.  EXPDECAY IS THE COMPLEMENT.  THE PULSE APPEARS TO SHOOT STRAIGHT UP
FAST RISE TIME AND DECAYS EXPONENTIALLY.  ON AN OSCILLOSCOPE, MULTI TONE
LOOKS LIKE THE DUAL FREQUENCY OUTPUT FROM PRESSING A BUTTON ON AN OLD
TELEPHONE KEYPAD.  THE FREQUENCY OF THE LOWER TONE IS ADJUSTABLE USING THE
FRONT PANEL BUTTONS, BUT THE FREQUENCY OF THE SECOND TONE IS NOT.  ON THE
LCD, THE SINC PULSE WAVEFORM LOOKS LIKE A SPECTRUM DISPLAY OF A NARROW
PULSE.  ON THE SCOPE IT IS A TRAIN OF SPECTRUM LIKE PULSES.  A NUMBER OF
EXPLANATIONS OF THE SINC WAVEFORM CAN BE FOUND BY SEARCHING ONLINE.  IT
APPEARS TO BE A WAVEFORM USED IN ADVANCED FILTER DESIGN.  ANOTHER ADVANCED
WAVEFORM, LORENZ PULSE, IS ALSO AVAILABLE.  FINALLY, THERE ARE 15 MEMORY
CHANNELS THAT CAN BE PROGRAMMED WITH WAVEFORMS OF YOUR CHOOSING.  COUNTER
AND MEASUREMENTS PRESSING THE MEAS BUTTON SWITCHES THE UNIT FROM GENERATING
SIGNALS TO MAKING MEASUREMENTS.  THE EXT.IN BNC CONNECTOR PROVIDES AN INPUT
CONNECTION.  THE SOFT SWITCH LABELS ON THE LCD LIST VARIOUS MEASUREMENTS
YOU CAN MAKE.  FIGURE 9 SHOWS A PORTION OF THE MEASUREMENT SCREEN IN THE PC
SOFTWARE.  THE INPUT FREQUENCY IS 3500003R00 HZ, OR 3R5 MHZ.  THE GATE SIZE
MAY BE CHANGED AND THE COUPLING IS SELECTABLE BETWEEN AC AND DC.  THERE ARE
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