microHAM DigiKeyer Manual page 21

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Invert: Some transceivers lack the ability to set the sense of the FSK input. If you cannot set the proper sense,
check the invert box. This is normally necessary only with the TenTec Omni V, Omni VI and Kenwood TS-940.
Strict bps: Some programs rely on the the FSK port for proper PTT timing; they drop PTT (unkey) when the
FSK port buffer is empty. With virtual ports, this may cause PTT to drop before the contents of a message
(macro) are complete. 'Strict bps' disables the virtual port buffering and transmits one character at a time to the
output. Due to the additional overhead, FSK output will be slightly slower but operation will be more reliable.
To test FSK operation from the computer to the radio, click on Test button with no port assigned or the port
closed. The Test button will generate "RY" two times.
CW PORT
By its very nature, USB is not well suited to transfer the real time events required for CW keying. In
addition to the latency inherent in the USB protocol, delays due to CPU load, internal Windows message
processing (inter-process communication) and data flow from another peripherals sharing same the USB
root hub can result in transmitted characters that are garbled. To minimize these unwanted operating
system effects Router uses a specially developed oversampling and prediction algorithm to assure the
smoothest possible transfer of control signal events over USB. Using these techniques, CW keying in the
Router is, in most cases, usable up to 50 WPM if the application generates keying signals accurately and
does not consume 100% of CPU time at the highest priority class.
Router allows assigning a virtual serial port for software CW 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 DTR for CW than RTS.
When an application opens the COM port (usually at start-up), Router will indicate the channel is open.
The state of the CW channel is indicated by a red
arrow. If port is opened, it does not mean that it is
properly configured. The red arrow will light in time
with the transmitted CW when the port is properly
configured.
To test CW operation, click on the Test button with no port assigned or the port closed.
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