Table of Contents
Advertisement
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
●
nd
2
PTT generated by an external application on the virtual COM port RTS or DTR
●
nd
PTT and 2
PTT behave the same and generate the same Serial PTT input.
A foot switch attached to the rear panel RCA jack.
●
The PTT switch of the microphone connected to the RJ45 MIC jack.
●
WinKey generated PTT.
●
The soundcard generated "Auto PTT."
●
PTT OUTPUTS
microKEYER II has four PTT outputs: PTT1, PTT2, PAPTT and LNA PTT. PTT1 and PTT2 are brought
out to the DB37 Radio connector. PAPTT and LNA PTT are RCA jacks for connecting to external devices.
PTT1 is wired to the radio microphone
jack and is generally used for
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 some radios to mute the
microphone and disable speech
processing circuits (clippers, audio
equalizers, transmit DSP, etc.) that
can distort digital modulation.
PA PTT is on the microKEYER II rear
panel. It is designed for switching
an external power amplifier. PA
PTT will lead PTT1 and PTT2 by
the PTT Delay value.
Note: PTT delay should be a few
miliseconds longer than the relay
activation time of the amplifier.
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 leads the PTT1 and PTT2 by the PTT Delay value and
opens after the transceiver PTT by the same amount.
microHAM © 2008 All rights reserved
PTT TAB
31
Advertisement
Table of Contents
