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Setting up a Yaesu FTDX-101

This article is a step by step approach describing how to set up an Yaesu FTDX-101 using the built-in USB interface. This article covers the set-up of RTTY in several steps.

Support for the Yaesu FTDX-101 was implemented WinTest 4.30. Be sure, you are running a current version of WinTest.

Yaesu FTDX-101

  • Download and install the Yaesu FTDX-101 driver FTDX101D/MP USB Driver (Virtual COM Port Driver) from the Yaesu Home Page on your computer.
  • After connecting the radio, you will find two new COM ports, in my case COM3 and COM4. COM3 will be used for CAT control, COM4 for FSK keying.
Device Manager shows the new COM ports after installing the YAESU driver


  • Download and Install MMTTY from here.
  • Also download the EXTFSK package from there. The ZIP file you are looking for is named
  • Extract and copy ExtFSK.dll to the MMTTY directory. There is nothing else to do to install this software.
  • Start MMTTY
  • Activate the XY Scope by selecting the View(V) menu item and tagging XYScope
The XY Scope is a practical tuning aid and will help us to visualize the received signals.
  • Go to Option(O) | Setup MMTTY(O)...
  • Select the Demodulator tab and set it up like in the picture below.
MMTTY Demodulator settings
  • Select the AFC/ATC/PLL tab and make sure AFC is OFF.
MMTTY AFC/ATC/PLL settings. Make sure AFC is off as it will eventually introduce a deviation between TX and RX frequencies.
  • Select the TX tab and switch PTT port to EXTFSK. The Radio Command button in this setup screen will allow you to control the radio from within MMTTY. This is not desired in this scenario so make sure it is not configured - otherwise Win-Test would not have access to the radio COM port later.
MMTTY Tx settings - FSK and PTT are generated by EXTFSK.DLL COM4
  • Setup EXTFSK to key COM4, DTR is used for FSK, RTS is used for PTT. Also you have to activate Inv. FSK.
MMTTY Tx settings - FSK and PTT are generated by EXTFSK.DLL COM4
  • Select the Misc tab. Since we now have two sound cards - one in the computer, one built into the radio - we must make sure we're listening on the latter.
Select the correct sound device for receiption. You may see several devices listed depending on the number of sound cards
  • Also from the Misc tab, select COM-TxD(FSK).
MMTTY Misc settings - FSK is generated via COM4
  • Exit the Setup screens by pressing the OK button.

We are now ready to do some tests with MMTTY.

  • Now take a look at the XY Scope display. It should look like the picture above.
  • If you only see a single white point in the middle of the display, this means, that MMTTY gets no receive audio to process.
    • Did you select the correct audio device?
  • Tune across the CW band and check if the XY scope changes when you hear signals. Once you tune across a carrier or CW signal, you should see a vertical ellipse and then a horizontal ellipse or vice versa depending on which direction you tune. The receive section of the screen will show all kinds of clutter.
  • Try to find a RTTY signal (not easy on a normal day). Both ellipses should now be perpendicular to each other. See if you can decode RTTY fine. You may have to select proper filters. I use 500 Hz at 8.8 MHz IF and 2.7 kHz at 455 kHz IF.
  • Next, press the TX button in the MMTTY application. You should hear the typical RTTY diddle in the monitor of the radio. The XY Scope will also display a clean RTTY signal.
  • Type a few characters (including your callsign) and see how they are transmitted.
  • Press the TX button one more time to shut off transmission.
  • Exit the MMTTY program now.

MMTTY now works perfectly as a stand-alone progam. We are now ready for Win-Test.


Final steps: Win-Test Interfaces configuration. Note that we only set up one COM port, no PTT or FSK settings are needed as they are all generated/controlled by EXTFSK.
  • Start up Win-Test, create a new Win-Test file for testing.
  • Select DXpedition and allow All Modes so you can test all three different modes.
  • in the Options | Configure Interfaces... menu
    • configure Radio on COM3
  • Go to Configure MMTTY.EXE startup path as described in the RTTY section of this manual if you are planning for RTTY operation

We are now ready to operate the contest.