Ports: Ptt; Nd Ptt; Ports: Foot Switch - microHAM micro KEYER 2R Manual

The PTT channel is used to control transmit/receive switching of the transceiver, Power Amplifier and Low
Noise Preamplifier (LNA). An internal sequencer assures 100% protection against transmitting through the
LNA or hot switching of the PA when the PTT channel is used. More information about T/R switching,
MK2R PTT outputs and the sequencer is provided under the PTT/FSK tab.
Router allows assigning a virtual serial port for PTT using DTR or RTS signals. The DTR* and RTS* are
identical to DTR/RTS except that the output is inhibited for one second after the COM port is opened.
RTS*/DTR* should only be used with programs that cause unwanted key-ups during startup.
TIP: More applications use RTS for PTT than DTR.
When an application opens the COM port (usually at
start-up), Router reports the channel as open.
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.
TIP: Always use serial PTT instead of the radio command PTT or VOX. It is right way to assure
proper sequencing of an LNA and Power Amplifier.
Note: Select RADIO1 or RADIO2 (as needed) with the buttons on MK2R when testing.
The 2 nd PTT channel is identical to the primary PTT channel. 2
application to key the radio if the primary application (logging software) also controls PTT.
Even though many applications do not monitor the status of the foot switch and do not have the ability to
perform specific functions base on closing or releasing the foot switch, we have decided to implement this
feature to the Router. Hopefully sometime soon applications will be able to detect the foot switch status
and use this this information for automating user functions like in the DOS based TRLog.
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 PORT
2 nd PTT PORT
FOOT SWITCH
33
nd PTT provides a way for a second