‰  NOW 35 WPM  ‰  TEXT IS FROM OCTOBER 2018 QST  PAGE 41‰

KEEP IN MIND THAT MOST TRANSMITTER VOX CIRCUITS REQUIRE THE PTT CIRCUIT TO
BE ACTIVE IN ORDER FOR THE TRANSMITTERS VOX FUNCTION TO OPERATE.  YOULL
PROBABLY WANT TO INCLUDE A TOGGLE SWITCH ON YOUR INTERFACE SO YOU CAN
GROUND THE RADIO PTT LEAD WHEN NEEDED.  MOST DIGITAL COMMUNICATION PROGRAMS
OUTPUT THE MODULATING AUDIO ON THE LEFT CHANNEL.  FLDIGI AND PERHAPS OTHER
PROGRAMS CAN ALSO BE CONFIGURED TO PROVIDE A 1 KHZ CONTROL SIGNAL ON THE
RIGHT CHANNEL AUDIO OUTPUT TO CONTROL THE PTT OF THE TRANSMITTER THAT IS,
WITH THE RIGHT CHANNEL CONTROL TONE PRESENT, THE TRANSMITTER KEYS ON, AND
WITH THE RIGHT CHANNEL CONTROL TONE ABSENT, THE TRANSMITTER REMAINS UN
KEYED.  I RECOMMEND USING THIS CONTROL TONE TO CONTROL THE TRANSMITTER WHEN
THE PROGRAM PROVIDES THAT OPTION.  THE ADVANTAGE OF USING THE RIGHT CHANNEL
CONTROL TONE TO CONTROL THE TRANSMITTER IS THAT THE AMPLITUDE OF THE
CONTROL TONE IS NOT RAMPED DURING ON/OFF TRANSITIONS.  WHEN ITS TIME TO
TURN ON THE TRANSMITTER THE FIRST HALF SINUSOIDAL CYCLE OF THE RIGHT
CHANNEL CONTROL TONE GOES TO FULL AMPLITUDE.  FLDIGI SOFTWARE ALSO PROVIDES
FOR FSK OUTPUT SEE PSEUDO FSK IN THE FLDIGI DOCUMENTATION.  WHEN THE PSEUDO
FSK OPTION IS ENABLED, THE PRESENCE OF THE RIGHT CHANNEL CONTROL TONE
REPRESENTS THE FSK MARK STATE WHILE ABSENCE OF THE RIGHT CHANNEL CONTROL
TONE REPRESENTS THE FSK SPACE STATE.  TO CONTROL THE TRANSMITTER WHEN THE
‰  END OF 35 WPM TEXT  ‰  QST DE W1AW  ƒ