‰  NOW 25 WPM  ‰  TEXT IS FROM OCTOBER 2018 QST  PAGE 42‰

WATERFALL DISPLAY.  TO ADJUST THE RECEIVE SIDE OF THE INTERFACE, SET YOUR
RADIO AUDIO VOLUME CONTROL TO WHATEVER WOULD BE A SOLID LISTENING LEVEL IF
YOU WERE USING THE INTERNAL RADIO SPEAKER WHILE LISTENING TO A STRONG
SIGNAL.  LEAVE THE RADIO VOLUME CONTROL IN THAT POSITION.  CONNECT A CABLE
FROM THE SPEAKER OUTPUT OF YOUR RADIO TO J2 PIN 5 OF THE INTERFACE.  THIS
MAY MUTE THE RADIO SPEAKER.  ADJUST THE RECEIVE ATTENUATOR, SW1, TO FULLY
COUNTERCLOCKWISE MINIMUM AMPLITUDE.  TUNE IN A SIGNAL ON YOUR RADIO.
ROTATE SW1 CLOCKWISE JUST UNTIL THE WATERFALL DISPLAY STARTS TO LOOK NOISY.
NOW ADJUST SW1 COUNTERCLOCKWISE ONE OR TWO POSITIONS.  YOU SHOULD NOW HAVE
A CLEAN WATERFALL DISPLAY, BUT ALSO A STRONG SIGNAL INTO THE SOUND DONGLE.
IF YOUR SOFTWARE PROVIDES AN INDICATOR TO SHOW WHEN THE INPUT AUDIO LEVEL
IS ACCEPTABLE, THEN USE THAT INDICATOR TO SET THE POSITION OF SW1.  FOR THE
TRANSMIT SIDE, START BY CONNECTING YOUR TRANSMITTER TO A SUITABLE DUMMY
‰  END OF 25 WPM TEXT  ‰  QST DE W1AW  ƒ