microHAM micro KEYER Manual page 21

All states of the audio switching can be stored into the MK memory. This setting will be applied after power
up. If you change some settings, new will be applied immediately for each state without storing to the MK
memory. Of course setting can be stored to any preset and recalled by touching preset button.
In this tab you can configure how the PTT and FSK will work. In the Ports tabs you have defined which
virtual COM port will carry these signals. Now you need to define behavior of this signals with coexistence
of the foot switch or hand microphone PTT.
PTT:
MK has three (3) PTT outputs: PTT1, PTT2 and PA PTT. PTT1 and PTT2 are present at DB37 Radio Port
connector and are designed to switch the radio to TX state. PTT1 is always wired to the radio front panel
mic jack and means "all time PTT" regardless of mode. PTT2 is wired to the radio accessory jack and can
be used with Kenwood and Yaesu radios for PTT with muted front microphone input for digital modes AFSK
or SSB voice keyer contesting. On radios which do not support this function, PTT2 can be used as general
purpose PTT output, and microphone mute you must select by correct audio switching setting and/or
computer mic mute function if your logger and sound card allow this.
PA PTT is present at the MK rear panel RCA and is designed for power amplifier switching.
PTT input event can be PTT from serial port, PTT from foot switch (same as PTT from hand mic) and PTT
from WinKey. With combo boxes you can define which PTT output will be switched if PTT event will appear.
You can define PTT1, PTT2 or both or nothing for each PTT event source.
PA PTT check box will close PA PTT output if checked and if any PTT event will appear.
FOOT SWITCH:
When foot switch is pressed, keyer can modify output signals.
It means not only audio switching (described in Audio tab), but can affect CW, PTT and FSK output lines.
First of all you can define delay for PTT1 and PTT2 lines going to the radio. This T/R sequencer removes all
hot-switching, because PA PTT is switched immediately and the radio is switched after a defined delay.
Select delay little bit more than is T/R delay of your power amplifier.
Mute computer CW = if checked, CW generated from the computer on CW port will be suppressed while
foot switch is pressed.
Mute computer FSK = if checked, FSK generated from the computer on FSK port will be suppressed while
foot switch is pressed.
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C - Audio output from radio goes to sound card Line In. Audio output from
computer is enabled and goes to radio front mic jack. Microphone is
connected to the computer sound card mic jack.
PTT / FSK
21