‰  NOW 13 WPM  ‰  TEXT IS FROM OCTOBER 2017 QST PAGE 71  ‰

BETWEEN YOUR TRANSMITTER AND THE ANTENNA.  LETS SAY YOUR FEED LINE IS 400
FEET LONG NOT TOO UNUSUAL FOR A FIELD DAY OR EXPEDITION TYPE SETUP.  YOU
NEED CABLE WITH A MATCHED LOSS OF 4 DB OR LESS AT THE FREQUENCY OF YOUR
PROBLEM BAND LETS SAY THATS 15 METERS, OR 21R2 MHZ.  YOU CAN START BROWSING
THROUGH WEB SITES, BUT YOULL FIND THAT THE LOSS DATA IS TYPICALLY ONLY
SPECIFIED AT 1, 10, 100, AND 1,000 MHZ.  THIS MAKES THE PROCESS HARDER THAN
IT NEEDS TO BE, SO TABLE 1 WAS DEVELOPED BY W3LPL USING A FEED LINE LOSS
ƒ  QST DE W1AW  ‰
CALCULATOR CREATED BY VK1OD.  IT SHOWS THE FEET PER DB FOR A WIDE VARIETY
OF COAXIAL CABLES.  THE LOSSIER THE CABLE TOWARD THE BOTTOM OF THE TABLE,
THE FEWER FEET REQUIRED TO INCUR 1 DB OF LOSS.  IN THE CASE OF OUR 15 METER
PROBLEM, FIND THE COLUMN LABELED 21R2.  OUR MATCHED LOSS BUDGET IS 4 DB AND
THE FEED LINE LENGTH IS 400 FEET, SO WE CAN ACCEPT ANY CABLE WITH MORE THAN
400 / 4 100 FEET/DB OF LOSS.  IF WE BEGIN AT THE BOTTOM, WE SEE THAT RG
‰  END OF 13 WPM TEXT  ‰  QST DE W1AW  ƒ