=  NOW 40 WPM  =  

AUDIBLE NOISE HAS GONE UP, THE RF NOISE HAS DECREASED CONSIDERABLY.
VARYING RESULTS AS FOR RESULTS, AS EXPECTED, THEY VARIED
CONSIDERABLY.  WHEN LISTENING TO PURE NOISE TUNED AWAY FROM ANY
DESIRED SIGNAL, NOISE SUPPRESSION WAS USUALLY VERY HIGH.  I COULD
BRING AN S 9 NOISE LEVEL DOWN TO PERHAPS S 1 OR S 2.  WITH CAREFUL
ADJUSTMENT, WHEN I TUNED BACK TO THE DESIRED SIGNAL, THE NOISE
DECREASED, BUT NOT AS MUCH.  THERE WAS NO QUESTION THAT IN SOME
CASES, THE NOISE S CONNECTIONS IN ADDITION TO THE TWO SO 239 SOCKETS
MENTIONED BEFORE, A THIRD SO 239 SOCKET LABELED TRX ON THE REAR
PANEL IS USED FOR CONNECTION TO YOUR TRANSCEIVER OR RECEIVER.  WHEN
TRANSMITTING, THE PTT CABLE CENTER PIN MUST GO TO GROUND AND THUS
PROTECT THE QRM ELIMINATOR.  THE OPERATING INSTRUCTIONS INCLUDE A
WARNING TO NOT USE THE MICROPHONE PTT LINE FOR THIS FUNCTION.  MOST
RADIOS HAVE A PTT CONNECTION ON THE REAR PANEL FOR KEYING AN
AMPLIFIER USUALLY A PHONO JACK OR SPECIFIC PINS ON AN ACCESSORY
PORT.  THATS THE CONNECTION THAT SHOULD BE USED TO TRIGGER THE QRM
ELIMINATOR TO MAKE SURE THAT IT SWITCHES SAFELY BEFORE THE
TRANSCEIVER STARTS TRANSMITTING RF.  ACCORDING TO THE MANUAL,
TRANSCEIVER POWER IS LIMITED TO 200 W, WHICH IS FINE FOR MOST RADIOS
TODAY.  IF YOU USE A POWER AMPLIFIER, INSTALL THE QRM ELIMINATOR
BETWEEN THE TRANSCEIVER AND AMPLIFIER.  HOWEVER, YOU MAY DAMAGE THE
QRM ELIMINATOR IF HIGH POWER RF FROM THE TRANSMIT ANTENNA COMES BACK
INTO THE RECEIVE ANTENNA PORT.  ITS FEASIBLE TO USE THE QRM
ELIMINATOR IN A HIGH POWER STATION, BUT IF YOUR ANTENNAS ARE CLOSE
TO EACH OTHER, CONSIDER ADDING AN RF LIMITER TO PROTECT THIS INPUT
THESE ARE TYPICALLY USED WITH LOW NOISE RECEIVE ANTENNAS TO PROTECT
THE RECEIVER.  OPERATING FREQUENCY RANGE IS 3R5 TO 60 MHZ.
OPERATING INSTRUCTIONS IN ADDITION TO THE THREE KNOBS, THE FRONT
PANEL HAS A RED PUSH BUTTON LABELED ON/OFF AND A LED JUST ABOVE THE
BUTTON.  WHEN THIS SWITCH IS OFF, YOUR TRANSMITTER IS CONNECTED
DIRECTLY TO THE MAIN ANTENNA CONNECTOR.  WHEN THE UNIT IS TURNED ON
AND YOU ARE RECEIVING, THE LED GLOWS RED/ORANGE.  WHEN YOU TRANSMIT
AND THE PTT LINE INPUT IS GROUNDED, THE LED GLOWS GREEN.  I FOUND
THAT THE LED IS NOT VERY BRIGHT IN THE FLUORESCENT LIGHTING IN MY
STATION.  BREAKING THE INSTRUCTIONS INTO STEPS 1 MAKE ALL
CONNECTIONS.  SELECTION OF THE SECOND ANTENNA AUX ANT TO BE
DISCUSSED SHORTLY.  2 ADJUST THE GAIN CONTROL SO THE NOISE APPEARS
TO HAVE THE SAME AMPLITUDE ON BOTH ANTENNAS.  3 ADJUST THE PHASE
KNOBS FOR MINIMUM NOISE.  4 CONTINUE REPEATING STEPS 2 AND 3 UNTIL
YOU HAVE MAXIMIZED THE NOISE REDUCTION.  YOU MAY HAVE TO TUNE OFF
FREQUENCY TO MAKE SURE YOU ARE ELIMINATING MORE NOISE THAN THE
DESIRED SIGNAL.  HOWEVER, CONTROL ADJUSTMENT DID NOT SEEM OVERLY
CRITICAL AND I COULD MAKE LARGER FREQUENCY CHANGES WITHOUT
READJUSTMENT THAN WITH ANOTHER UNIT I PREVIOUSLY USED.  ANTENNA
SELECTION AND PLACEMENT SUPPOSE YOUR MAIN ANTENNA, SOME 50 FEET UP
IN THE AIR, PICKS UP THE SIGNAL YOU WANT TO HEAR, ALONG WITH SOME
AMOUNT OF NOISE.  THE SECOND ANTENNA
=  END OF 40 WPM TEXT  =  QST DE W1AW  <