‰  NOW 30 WPM  ‰
THE WEIGHT OF THE FEED LINE DOES NOT HAVE TO BE SUPPORTED BY THE HIGHER AND
THINNER SECTIONS OF THE MAST.  UNFORTUNATELY, THE 39 FOOT HIGH MAST WAS NOT
TALL ENOUGH TO SUPPORT A 40 METER LOOP, AND A 20 METER LOOP WOULD ONLY
PROVIDE COVERAGE OF THE 20 AND 10 METER BANDS THROUGH THE HARMONIC
RELATIONSHIPS.  AT THIS LOW POINT IN THE SUNSPOT CYCLE, I ALSO WANTED TO BE
ABLE TO WORK THE 40 AND 15 METER BANDS.  FORTUNATELY A LOOP WHICH IS N /2
LONG IS ALSO RESONANT THE REACTIVE COMPONENT OF ITS IMPEDANCE IS ZERO,
ALTHOUGH IT HAS A VERY HIGH IMPEDANCE AS HIGH AS 50 K FOR THE /2 LOOP.
THIS HIGH RESISTIVE IMPEDANCE CAN BE TRANSFORMED TO A LOW IMPEDANCE USING A
/4 MATCHING SECTION OF THE RIGHT CHARACTERISTIC IMPEDANCE.  TO TRANSFORM 50
K TO 50 WOULD REQUIRE A MATCHING SECTION WITH A CHARACTERISTIC IMPEDANCE Z0
OF ABOUT 1600, WHICH IS NOT FEASIBLE.  HOWEVER A QUARTER WAVE MATCHING
SECTION WITH A Z0 OF 800 ABOUT THE MAXIMUM PRACTICAL IMPEDANCE WOULD
TRANSFORM 50 K TO APPROXIMATELY 13, RESULTING IN AN SWR OF 4 1 ON 50 COAX.
‰  FROM PAGE 96  ‰
LU2NI/341 LU3MCJ/343 LY2ZZ/349 LZ1HA/342 LZ2CC/346 N0AT/351 N0AV/351
N0TB/354 N0XA/346 N1DCM/341 N1XX/367 N2TK/347 N2TU/341 N3AM/346 N3BNA/341
‰  END OF 30 WPM TEXT  ‰  QST DE W1AW  ƒ