WinWarbler External Modem Settings

WinWarbler Online Help Contents

The External Modem tab provides settings that control operation when WinWarbler is sending and receiving RTTY or CW via an external modem connected to your PC via a serial port, via a transceiver controlled by Commander, or via another application. (screen shot).

The model selector lets you choose the external modem model from among those for which external modem command files are present in WinWarbler's Modems subfolder. WinWarbler includes files for the KAM, MFJ464, PK232, PK900, PTCII, and TinyFSK. WinWarbler also includes 

You can modify the provided command files, or create files for other modem models using a simple command syntax.

The send control characters from Transmit Pane box, when checked, routes control characters struck in the Transmit Pane other than CTRL-J, CTLR-Q, CTRL-R, CTRL-S, and CTRL-V to the external modem. This allows you to directly control the external modem -- setting parameters or switching to another mode -- but means that keyboard shortcuts used to navigate among QSO Info panel textboxes will not function in the Transmit Pane. If this box is checked while in CW mode with keying via the external modem, the Auto Start and Auto Stop settings are unchecked and disabled; this prevents keystrokes intended to control the external modem from initiating transmission.

Clicking the reset button sends an InitCmd to the external modem.

The serial port panel lets you specify and configure the serial port by which your external modem is connected.

The RTTY panel controls the RTTY operation of the external modem.

enabled check to enable RTTY operation via an external modem
unshift on space check if RTTY operation should return to letters mode after receiving a space character
speed select the RTTY baud rate
shift select the RTTY shift in Hertz
reverse sub-panel

specifies whether transmitted or received data is inverted

transmit check to transmit reverse RTTY (disabled if the active external modem command file does not specify a command to invert transmitted data)
receive check to receive reverse RTTY  (disabled if the active external modem command file does not specify a command to invert received data)

note: Changes to either of the settings in this panel will update the reverse checkboxes in the Main window's Receive and Transmit panels.

modulation and transceiver mode sub- panel

specifies the form of modulation, sideband, transceiver mode, frequency compensation, and optimal offset

AFSK (LSB)  

  • configures WinWarbler for AFSK RTTY operation on the lower sideband

  • elects the specified transceiver mode (if Commander is running and RTTY operation via the external modem is active, switches the transceiver to the specified mode)

  • configures soundcard RTTY for lower sideband (so that if simultaneous soundcard RTTY and external RTTY modem operation is utilized, both mechanisms use the same sideband)

  • specifies a Mark offset (in Hertz)  that aligns the displayed RTTY receive frequency with a known mark frequency when operating in AFSK mode; negative values are accepted. This can be used to compensate for an offset between your transceiver's VFO display and its actual frequency.

  • specifies the optimal receive offset frequency (in Hertz) used by the Optimal Offset function when operating in AFSK mode; when the Optimal Offset function is invoked, the transceiver is QSY'd so that optimal receive offset falls midway between the mark and space frequencies
AFSK (USB)

  • configures WinWarbler for AFSK RTTY operation on the upper sideband

  • elects the specified transceiver mode (if Commander is running and RTTY operation via the external modem, switches the transceiver to the specified mode)

  • configures soundcard RTTY for upper sideband (so that if simultaneous soundcard RTTY and external RTTY modem operation is utilized, both mechanisms use the same sideband)

  • specifies a Mark offset (in Hertz)  that aligns the displayed RTTY receive frequency with a known mark frequency when operating in AFSK mode; negative values are accepted. This can be used to compensate for an offset between your transceiver's VFO display and its actual frequency.

  • specifies the optimal receive offset frequency (in Hertz) used by the Optimal Offset function when operating in AFSK mode; when the Optimal Offset function is invoked, the transceiver is QSY'd so that optimal receive offset falls midway between the mark and space frequencies
FSK (LSB)

  • configures WinWarbler for FSK RTTY operation on the lower sideband

  • elects the specified transceiver mode (if Commander is running and RTTY operation via the external modem is active, switches the transceiver to the specified mode)

  • configures soundcard RTTY for lower sideband (so that if simultaneous soundcard RTTY and external RTTY modem operation is utilized, both mechanisms use the same sideband)

  • specifies a Mark offset (in Hertz)  that aligns the displayed RTTY receive frequency with a known mark frequency when operating in FSK LSB mode; negative values are accepted. This can be used to compensate for an offset between your transceiver's VFO display and its actual frequency.

  • specifies the optimal receive offset frequency (in Hertz) used by the Optimal Offset function when operating in FSK mode; when the Optimal Offset function is invoked, the transceiver is QSY'd so that optimal receive offset falls midway between the mark and space frequencies
FSK (USB)

  • configures WinWarbler for FSK RTTY operation on the upper sideband

  • elects the specified transceiver mode (if Commander is running and RTTY operation via the external modem, switches the transceiver to the specified mode)

  • configures soundcard RTTY for upper sideband (so that if simultaneous soundcard RTTY and external RTTY modem operation is utilized, both mechanisms use the same sideband)

  • specifies a Mark offset (in Hertz)  that aligns the displayed RTTY receive frequency with a known mark frequency when operating in FSK USB mode; negative values are accepted. This can be used to compensate for an offset between your transceiver's VFO display and its actual frequency.

  • specifies the optimal receive offset frequency (in Hertz) used by the Optimal Offset function when operating in FSK mode; when the Optimal Offset function is invoked, the transceiver is QSY'd so that optimal receive offset falls midway between the mark and space frequencies