Configuring the CW Keying connection
The Keying panel on the CW tab of WinWarbler's Configuration window specifies how a CW keying signal is to be generated; there are 5 basic alternatives:
by a serial port RTS or DTR signal, employing RS-232 voltage levels (+12 VDC, -12 VDC)
by a parallel port data Data, Init, or Select signal, employing TTL voltage levels (+5 VDC, 0 VDC)
by a transceiver that can be directed to transmit CW via CAT command and that is being controlled by Commander
set the Keying panel to Xcvr Ctrl App
- automatic switching between reception and transmission may also require configuring your transceiver for CW Break-In operation
- DZKit Sienna
Elecraft: K2, K3, K3S, KX2, KX3 (additional configuration instructions for the K3 are here); note: enable the transceiver's VOX function
FlexRadio: all models running PowerSDR or SmartSDR
- Icom: IC-705, IC-7100, IC-7300, IC-7410, IC-7600, IC-7610, IC-7700, IC-7800, IC-7850, IC-7851, IC-9100, IC-9700
enable the transceiver's Break-in function
- Icom transceivers provide a command that conveys up to 30 characters to be sent in CW, but provide no indication of how many CW characters remain un-transmitted. Commander will break messages larger than 30 characters into multiple commands, but the transceiver may reject commands if sufficient buffering in its microprocessor's memory is not available
- Kenwood: TS-480, TS-570, TS-590, TS-870, TS-990, TS-2000
Some transceivers require their Break-in function to be enabled in order to transmit CW via the means described above.
RTS or DTR Circuit Details
If you use a serial port RTS or DTR signal, an external circuit is required is required to drive your transceiver's straight key input:
- a simple opto-isolator circuit
- a simple NPN transistor circuit
W3YY offers a kit containing a circuit board and electronic components that when assembled provides a level converter for CW; it also provides a level converter for FSK
- a section of a commercial interface.
Changing a Serial Port's COM Number
If necessary, you can change the COM port number that Windows assigns to a USB-to-serial-port adaptor.