Ptt & 2; Ports: Foot Switch - microHAM MK2R User Manual

The PTT channels are used to control transmit/receive switching of the transceiver and power amplifier. An
internal sequencer assures 100% protection against hot switching of the PA when the PTT channel is used.
More information about T/R switching and the sequencer is provided under the PTT tab.
Router allows assigning virtual serial ports for PTT using the DTR or RTS signals. DTR* and RTS* are
identical to DTR/RTS except that the output is inhibited for one second after the COM port is opened and .
should only be used with programs that cause unwanted key-ups during startup.
TIP: More applications use RTS for PTT than DTR.
The state of the PTT channel is indicated by a green
arrow. If the port is opened, it does not mean it is
properly configured. When the port is properly
configured, the arrow will light during the entire
transmission. To test PTT operation, click on the Test button with no port assigned or the port closed.
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The 2 PTT channel is identical to the primary PTT channel. 2
application to key the radio if the primary application also controls PTT – for example, a logging program
and CW reader/keyboard.
TIP: Always use serial PTT instead of the radio command PTT or VOX. It is the only way to assure
proper sequencing of a Power Amplifier, LNA or receive antenna switch.
To test PTT, click on the Test button with no port assigned or the port closed.
NOTE: Select RADIO1 or RADIO2 (as needed) with the buttons on MK2R when testing.
Router allows assigning a virtual serial port to the foot switch channel and selecting one of four available
input control lines (CTS, DCD, DSR or RING). Note: CTS is not available if the foot switch channel is
shared with the radio control port. The state of the signal on the virtual port can be inverted by checking
inverted box.
When a COM port is assigned for the foot switch but the application does not support foot switch status (or
no application is running), Router reports the channel as closed.
When an application opens the COM port (usually
at start-up), Router reports channel as open.
When the foot switch is pressed, this state is indicated by a red arrow.
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PTT & 2 PTT PORTS
FOOT SWITCH
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PTT provides a way for a second