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The PTT channel is used for T/R switching of the transceiver, Power Amplifier and Low Noise Preamplifier
(LNA). An internal T/R sequencer assures 100% protection against transmitting through the LNA or hot
switching of the PA when the PTT channel is used for T/R switching. More information about T/R switching, DIGI
KEYER PTT outputs and the sequencer is provided under the Keying Tab (page 21).
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.
nd
The 2
PTT channel is identical to the primary PTT
nd
channel. 2
PTT provides a way for a second
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.
Even though most applications do not monitor the squelch and do not have the ability to perform specific
functions based on its status, we have decided to include this feature in Router. Perhaps someday applications
will be able to detect the squelch and use this information for automated functions like audio recording.
Router allows assigning a virtual serial port to squelch as CTS, DSR, DCD or RING.
When a COM port is assigned to the squelch channel in Router but not in the application (or no application is
running), Router shows the channel as closed.
When an application opens the COM port (usually at start-up), Router shows channel as open.
When squelch is active, this sta te is indicated by a red arrow.
The Control Port allows an application program (logger)
that implements the microHAM Control (SO2R) Protocol
to use the stored CW messages. This port should
normally be set to "none."
The Mon button opens a logging window that permits capture of Protocol data between the application and
Router for later analysis. The Control monitor operates the same way as the CAT port monitor. The buffer
captures the last approximately 20K of data. Do not enable logging unless necessary for debugging purposes as
it imposes a minor performance penalty.
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nd
PTT & 2
PTT PORTS
SQUELCH PORT
CONTROL PORT
22
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