Keying Tab; Audio; Ptt - microHAM DigiKeyer Manual

The Keying tab includes controls for the USB Audio processor, PTT and FSK Keyboard.
DigiKeyer has three (3) PTT outputs: PTT, PA PTT and LNA PTT. PTT is brought out to the DB15 Radio
connector. PA PTT and LNA PTT are available on RCA connectors at the DigiKeyer rear panel.
PTT is normally wired to the radio Accessory jack
and is used to switch the radio into
transmit.
PA PTT is present at the DIGI KEYER rear panel
RCA jack and is designed for switching a
power amplifier. PA PTT is enabled by
checking the PA PTT box.
PA PTT will close before transceiver PTT by
the amount of selected PTT Delay and will
open at the same time as the transceiver

PTT.

LNA PTT is present at the DIGI KEYER rear panel
RCA jack and is designed for switching
(bypassing) a low noise preamplifier (LNA)
during transmit.
checking the LNA PTT box.
LNA PTT will close before the transceiver
PTT by the amount of selected PTT Delay
and will open after the transceiver by the
same amount.
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KEYING TAB

PTT – T/R KEYING
LNA PTT is enabled by
Serial port PTT: selects whether PTT is enabled.
PTT delay: amount of delay between activation of PA PTT and LNA PTT
and the activation of the radio PTT. 0 to 2500 milli-seconds.
PA PTT: Enable PA PTT output
LNA PTT: Enable LNA PTT output
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