‰  NOW 30 WPM  ‰  TEXT IS FROM FEBRUARY 2020  QST  PAGE 43 ‰

RESISTIVE AXIS OF THE SMITH CHART SEE FIGURE 1 IS THE ONLY STRAIGHT LINE ON
THE CHART.  ITS NORMALIZED MIDDLE VALUE IS 1.  TO THE LEFT SIDE, THE VALUES
APPROACH 0 TO THE RIGHT SIDE, THE VALUES APPROACH INFINITY.  THE REACTIVE
AXIS OF THE SMITH CHART IS THE OUTER PERIMETER.  THE NORMALIZED VALUE AT
THE TOP CENTER IS 1 OF INDUCTIVE REACTANCE, AND THE VALUE AT THE BOTTOM
CENTER IS 1 OF CAPACITIVE REACTANCE.  AS WITH THE RESISTIVE AXIS, VALUES TO
ONE SIDE OF THE CHART APPROACH ZERO, AND VALUES TO THE OTHER SIDE APPROACH
INFINITY.  THE 50 COAX FROM MY VERY SHORT, 80 METER COIL LOADED ROTATABLE
DIPOLE PRESENTED AN IMPEDANCE OF 135 J 90 TO MY RIG AT 3580 KHZ THE J
INDICATES A CAPACITIVE REACTANCE.  135 J90 NORMALIZES TO 2R7 J1R8 AND IS
PLOTTED AT POINT Z IN FIGURE 1.  POINT Z ESTABLISHES THE RADIUS OF SWR
CIRCLE C1, WHICH IS CONCENTRIC WITH THE CENTER OF THE CHART.  THE SWR
CIRCLE TRAVERSES ALL THE IMPEDANCES ALONG A HALF WAVELENGTH OF THE COAX THE
IMPEDANCES REPEAT EVERY HALF WAVE.  THE RIGHT MOST VALUE WHERE CIRCLE C1
CROSSES THE STRAIGHT, RESISTIVE AXIS INDICATES THE SWR ON THE COAX 4 1 IN
THIS CASE.  WE WANT TO GET FROM CIRCLE C1 TO THE CENTER OF THE CHART, WHICH
‰  END OF 30 WPM TEXT  ‰  QST DE W1AW  ƒ