‰  NOW 30 WPM  ‰  TEXT IS FROM JULY 2014 QST  PAGE 36‰

INSTALLED, THE RECEIVER CAN BE SET UP IN SEVERAL DIFFERENT WAYS.  THERE ARE
THREE PARAMETERS WE ARE CONCERNED WITH PT THE AGC THRESHOLD, WHICH IS THE
RF LEVEL IN DBM AT THE RECEIVERS 50 ANTENNA INPUT WHERE THE S METER BEGINS
TO MOVE EFFECTIVELY THE DB PER S UNIT INDICATED BY THE S METER AND P9 THE
RF LEVEL IN DBM AT THE RECEIVERS 50 FOR A METER READING OF S 9.  ASSUMING
THE METER HAS A CONSTANT SENSITIVITY S THE THREE PARAMETERS ARE RELATED BY
THE EQUATION NOTE THAT YOU MAY ONLY CHOOSE TWO OF THE THREE PARAMETERS AS
THE THIRD WILL BE DETERMINED BY THE EQUATION.  ALTHOUGH THERE ARE AN
INFINITE NUMBER OF PARAMETER CHOICES, THEY CAN BE NARROWED DOWN
CONSIDERABLY WITH A FEW COMMON SENSE ASSUMPTIONS.  FOR ON AIR COMPARATIVE
MEASUREMENTS, WE WANT S TO BE A WHOLE NUMBER, SUCH AS 3, 4, 5, OR 6 DB/S
UNIT.  TYPICALLY YOU WOULD CHOOSE A DESIRED S AND P9 AND THEN CALCULATE PT
FROM THE ABOVE EQUATION.  FOLLOWING THE ALIGNMENT PROCEDURE, YOU WILL THEN
DETERMINE WHETHER THE RECEIVER HAS ENOUGH GAIN TO ACHIEVE THE PT YOU HAVE
CALCULATED.  SETTING S TO 3 DB/S UNIT RESULTS IN A METER RANGE FROM S 0 TO
S 9 OF ONLY 27 DB, WHICH IS A BIT LIMITED.  CHOOSING 6 DB/S UNIT WOULD BE
‰  END OF 30 WPM TEXT  ‰  QST DE W1AW  ƒ