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DIGI KEYER has three (3) PTT outputs: PTT, PA PTT and LNA PTT. PTT is brought out to the DB15
Radio Port. PA PTT and LNA PTT are available on RCA connectors at the DIGI KEYER 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. LNA PTT is enabled by 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.
If an external PS/2 keyboard is attached to the MK, Router supports additional
settings for FSK.
Diddle LETTERS will generate the "LETTERS" character if nothing is being
typed
UOS automatically generates the "Unshift on Space" function when checked
Type ahead enables a type ahead buffer for the keyboard.
QWERTZ layout configures DIGI KEYER for the alternate keyboard layout
Invert FSK: Unlike AFSK, an FSK signal cannot be inverted by most
application programs because the UART used in a real serial port
lacks that capability. Because DIGI KEYER is a software defined
interface, it can invert the FSK signal. When the Invert FSK box is checked, MK changes the
"at rest" state of the front panel FSK light. FSK green led will light continuosly and go off
when FSK signal is present. If your radio requires inverted FSK keying, your first choice
should be to use the radio's menu, not DIGI KEYER (check your operating manual for
specific information). Invert FSK should be checked only for radios which do not provide this
support.
microHAM © 2006 All rights reserved
PTT – T/R KEYING
FSK from Keyboard
22
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