=  NOW 25 WPM  =  TEXT IS FROM MARCH 2022 QST  PAGE 48 =

PERHAPS A SHORT PIECE OF WIRE COULD PICK UP THE NOISE AS WELL, BUT THE
STRENGTH OF THE DESIRED SIGNAL WOULD BE MUCH LOWER.  THEN THE NOISE IN
COMMON TO THE TWO ANTENNAS CAN BE NULLED OUT IN THE QRM ELIMINATOR, WHILE
THE DESIRED SIGNAL WILL NOT NULL OUT BECAUSE ITS AMPLITUDE IS MUCH GREATER
ON THE MAIN ANTENNA.  THE INCLUDED INSTRUCTION SHEET BRIEFLY DISCUSSES THE
ANTENNA FUNCTIONS AND NOTES THAT THE SECOND ANTENNA SHOULD BE FAR ENOUGH
FROM THE MAIN ONE THAT IT DOES NOT PICK UP ENOUGH SIGNAL WHEN TRANSMITTING
TO DAMAGE THE QRM ELIMINATOR.  THE SECOND ANTENNA MUST BE STATIONARY FOR
THE NOISE TO NULL OUT PROPERLY, BECAUSE THE RELATIVE AMPLITUDE AND PHASE
COMING FROM BOTH ANTENNAS SHOULD STAY CONSTANT, OR ELSE THE CONTROLS WILL
NEED TO BE READJUSTED.  EVEN SO, A STATIONARY TRUCK, FOR EXAMPLE, COULD
PRODUCE NOISE THAT CAN BE NULLED OUT, BUT IF IT IS MOVING, THE NOISE WILL
NOT NULL AS WELL AT THE SAME SETTINGS.  IT IS ALSO POSSIBLE THAT RIGIDLY
=  END OF 25 WPM TEXT  =  QST DE W1AW  <