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RTTY FSK

the FSK connection

Transceivers capable of FSK operation generally provide a TTL input (voltage levels +5 VDC, 0 VDC) that controls the switching between Mark and Space frequency generation:

  • Transceiver

    FSK Mode Name

    FSK Input Signal (connector & pin)

    Elecraft K3

    FSK D

    FSK IN (ACC pin 1)

    Icom

    RTTY

    RTTY (ACC-1 pin 1)

    Kenwood TS-590

    FSK

    RTTY (ACC2 pin 2)

    Kenwood TS-990

    FSK

    RTTY (ACC2 pin 2)

    Kenwood TS-2000

    FSK

    RTTY (ACC2 pin 2)

    TenTec Omni-VII

    FSK

    MARK/SPACE (ACC 1 pin 5)

    TenTec Orion II

    FSK

    MARK/SPACE (I/O pin 8)

    Yaesu FT-450

    RTTY

    FSK IN (DATA pin 4)

    Yaesu FT-950

    RTTY

    FSK IN (RTTY/PKT pin 4)

    Yaesu FT-1000MP MARK-V

    RTTY

    SHIFT (RTTY pin 1)

    Yaesu FT-2000

    RTTY

    SHIFT (RTTY pin 1)

    Yaeus FTDX-9000

    RTTY

    FSK IN( RTTY pin 4)

WinWarbler can be configured to generate this signal

or

  • using the TxD, RTS, or DTR pin of any available serial port

All of these signals employ RS-232 voltage levels (+12 VDC, -12 VDC), so an external level converter is required:

Configuring WinWarbler for FSK operation

WinWarbler can be configured to generate the FSK signal on the TxD, RTS, or DTR pins of any available serial port. If you are using a USB-to-serial-port adapter and will be configuring WinWarbler to generate the FSK signal on the TxD pin, then this USB-to-serial-port adapter must support 5-bit operation at 45 baud, and you must configure the MMTTY engine to transmit characters at a rate that the USB-to-serial-port adapter can handle:

  1. set the Main window's Operating Mode panel is set to RTTY

  2. on the Configuration window's RTTY tab,

    1. check the Enabled box

    2. click the MMTTY Setup button

  3. on the MMTTY Setup window's Misc tab

    1. set the Tx port panel to COM-TxD (FSK)

    2. click the USB button

  4. in the USB Port Option window, select the C: Limiting Speed option and click the OK button to close the window

  5. close the MMTTY Setup window by click the OK button in its lower-right corner

If you are using a USB-to-serial-port adaptor and will be configuring WinWarbler to generate the FSK signal on the RTS or DTR pins, then support for 5-bit operation at 45 baud is not required.

To use the PTT serial port's TxD pin, open the Config window's PTT tab and note the serial port selected in the PTT panel's Port tab. Select the Config window's RTTY tab, and in the Modulation and transceiver mode panel's FSK section,

  • click the LSB button

  • set the FSK Control selector to the same serial port selected in Port panel on the Config window's PTT tab

If necessary, you can change the COM port number that Windows assigns to a USB-to-serial-port adaptor.

For more flexibility in serial port selection or to utilize a USB-to-serial-port adaptor that does not support 5-bit operation at 45 baud, open the Config window's RTTY tab, and in the Modulation and transceiver mode panel's FSK section,

  • click the LSB button

  • set the FSK Control selector to ExtFSK

When the Main window's Operating Mode panel is set to RTTY with the Enabled box checked on the Config window's RTTY tab, an EXTFSK icon will appear in the Windows Task Bar along the bottom of your monitor. Click this EXTFSK icon to open the EXTFSK window; in this window,

  • set the Port selector to the desired serial port

  • set the FSK output panel to TxD, RTS, or DTR as desired (if using a USB-to-serial-port adaptor that doesn't support 5-bit operation at 45 baud, choose RTS or DTR)

The EXTFSK icon will appear in the Windows Task Bar whenever you operate in soundcard RTTY mode, but it will remember the settings you've established, so subsequently opening the ESTFSK window is unnecessary.


Setting up CW, Phone, PSK, and RTTY Operation

Getting Started with CW, Phone, PSK, and RTTY Operation

Getting Started with DXLab

FSKConnection (last edited 2019-07-02 22:20:49 by AA6YQ)