microHAM MK2R Manual page 50

PTT lead: Specifies lead-in delay.
In CW with PTT1, PTT2 or Semi Break-in, PTT lead is
the time between activation of PTT1, PTT2, PA PTT and
LNA PTT and the first CW output. Transceiver PTT
(PTT1/PTT2), PA PTT and LNA PTT all activate at the
same time.
In CW with QSK, PTT lead has no effect. The leading
edge of PA PTT and LNA PTT are coincident with the
CW output.
In VOICE and FSK/DIGITAL, PA PTT and LNA PTT lead
transceiver PTT (PTT1 or PTT2) by the amount of PTT
lead.
PTT tail: Defines how long PTT 1 or PTT2 remains closed after
the last CW character. PTT tail can be set to a constant
value or can be proportional to the CW speed between
seven (1.00 wordspace) and ten (2.00 wordspace) dot
lengths.
PA PTT tail: Defines the time that PA PTT remains closed after
transceiver PTT (PTT1 or PTT2) and/or PTT IN opens
when switching from transmit to receive.
LNA PTT tail: Defines the time that LNA PTT remains closed after transceiver PTT (PTT1 or PTT2) and/or PTT
IN opens when switching from transmit to receive.
NOTE: LNA PTT tail should always be greater than or equal to PA PTT tail.
ENABLE is an optional signal available on the ACC jack. Enable may be used with transceivers that provide an
inhibit input from producing RF output until the amplifier and/or LNA switching is complete.
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