Ptt & 2 - microHAM micro2R u2R 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.
NOTE: the CAT port may be used PTT if it is provided by a microHAM interface.
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 selected or the port closed.
NOTE: Select RADIO1 or RADIO2 (as needed) with the TX R1/R2 button on micro2R when testing.
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PTT & 2 PTT PORTS
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PTT provides a way for a second