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The PTT tab allows configuring PTT operation.
PTT INPUTS:
microKEYER II has six PTT sources:
PTT generated by the logging program on the virtual COM port RTS or DTR
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nd
2
PTT generated by an external application on the virtual COM port RTS or DTR
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PTT and 2
A foot switch attached to the rear panel RCA jack.
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The PTT switch of the microphone connected to the RJ45 MIC jack.
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WinKey generated PTT.
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The sound card generated "Auto PTT."
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PTT OUTPUTS
microKEYER II has four PTT outputs: PTT1, PTT2, PA PTT and LNA PTT. PTT1 and PTT2 are brought
out to the DB37 Radio connector. PAPTT and LNAPTT are RCA jacks for connecting to external devices.
PTT1 is wired to the radio microphone jack and is
generally used for CW and VOICE modes.
PTT2 is wired to the radio Accessory jack and is used
to switch the radio into transmit in DIGITAL and
FSK modes.
NOTE : PTT2 or "rear panel" PTT is used by
PA PTT is on the microKEYER II rear panel. It is
designed for controlling an amplifier. PA PTT
will close before PTT1 and PTT2 by the amount of PTT lead and open after the transceiver
PTT by PA PTT tail setting.
NOTE: PAPTT tail should be set to provide a few milliseconds of delay after the transceiver
LNA PTT is on the microKEYER II rear panel. It is designed for bypassing a low noise preamplifier
(LNA) or disabling receive antennas during transmit. LNA PTT is enabled by checking the
LNA PTT box. LNA PTT will close before PTT1 and PTT2 by the amount of PTT lead and
open after the transceiver PTT by LNA PTT tail setting.
microKEYER II can select PTT1 or PTT2 based on the mode reported by the transceiver. If
Router is not able to read the operating mode from your radio (radio does not have computer
control port or does not report usable mode information), you can select one of four fixed "no
radio" modes or one "no radio" mode with manual (keyboard/keypad) mode selection.
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nd
PTT behave the same and generate the same Serial PTT input.
some radios to mute the microphone
and disable speech processing circuits
(clippers, audio equalizers, transmit
DSP, etc.) that can distort digital
modulation.
PTT releases. Some transceivers produce RF even after their "amplifier PTT" drops
and the delay will prevent "hot switching on release".
PTT TAB
35
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