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The MMTTY Plug-in for WriteLog

Page 4 - MMTTY Settings

MMTTY Settings

The MMTTY Settings button on the Rttyrite MMTTY Settings screen will take you to the Setup screen for MMTTY.  You can also get to the Setup screen by way of the Option(O) pulldown menu on the RTTY Control Panel.

The Setup screens in the MMTTY Plug-in for WriteLog are similar to the the ones that comes with the MMTTY stand-alone program but with some very important differences.  The reason they are different is because WriteLog handles certain setup functions in a different manner which is native to WriteLog.  Therefore, if WriteLog handles a certain setup function differently from the stand-alone program, then that setup function will not be available in the Plug-in version of the Setup screen.  For example, the COM port assignment for FSK & PTT are set on the TX tab screen of the stand-alone MMTTY program.  In WriteLog, the FSK & PTT COM port assignments are set in the Ports menu of the Rttyrite window.  Therefore, that area of the TX tab screen is completely gone in the plug-in version of Setup.  This is explained in detail in the next section.

The biggest differences between the MMTTY Plug-in for WriteLog Setup screens and the stand-alone MMTTY program setup screens are on the TX, Font Window and Misc screens.  These differences will be shown in the next three Sections - Setup TX Screen, Setup Font/Window Screen, and Setup Misc Screen (shown on page 5).  In each of these sections you will be shown side-by-side screenshots to compare the differences between the screens.  In each example, the MMTTY plug-in screen will be shown on the left and the MMTTY stand-alone program screen will be shown on the right.

Setup TX Screen

The Setup TX Screen from the MMTTY Plug-in for WriteLog (Fig. A) differs greatly from the Setup TX Screen in the MMTTY stand-alone program (Fig. B).


The Setup TX Screen from the plug-in does not contain the Input Button, Macro or PTT (including Radio command) areas that are available in the MMTTY stand-alone program.  The Input Button and Macro areas are not needed in the plug-in because macros (called RTTY messages in WriteLog) are created in WriteLog on the main WriteLog window under the Setup menu (see Fig. C).

Fig. C

The PTT area of the TX screen is not needed in the plug-in because the PTT (and FSK) COM port is set in the Rttyrite window when using WriteLog (see Fig D).  The Radio Command button is not needed in the plug-in because Radio Command is handled differently with WriteLog.  Radio Command in WriteLog is set in the Ports option of the Setup menu in the main WriteLog window (not shown).

Fig. D

It should be understood that in FSK operation, the PTT and FSK COM ports are the same.  When operating RTTY, we know we must activate PTT in order to key the radio.  PTT can be activated three different ways depending on several factors.  When using AFSK transmission (audio out of the sound card going to the audio input of a transmitter), PTT can be keyed by VOX.  But keying PTT by VOX is undesirable because any sounds generated by Windows can accidentally be transmitted over the air.  The two other methods of keying PTT, using either AFSK or FSK transmission, are PTT via an external interface connected to a COM port or via Radio Control.

Keying PTT via Radio Control is only available in those radios that support this option.  Refer to your radio's operating manual to determine if your radio supports PTT via Radio Control.  In order to key PTT via Radio Control, you must have your radio connected to your computer.

Keying PTT via a COM port requires an external interface.  This external interface can be either a simple transistor circuit or included in a commercial-type sound card interface such as a RIGblaster, MFJ Sound Card Interface or RASCAL interface.  If you are going to key PTT via an external interface, you must set the COM port in the Rttyrite window under the Port menu as shown in Fig. D above.

The last options in the Rttyrite Port menu are "Software generated FSK TXD" and "Software generated FSK DTR".  If you are going to use a USB-to-serial port adapter to generate FSK, you must select one of these two options after you select your port number.  Software-generated FSK acts in a similar fashion to MMTTY's EXTFSK, in that it allows 5-bit Baudot FSK to be generated on either the TxD or DTR line of a USB-to-serial port adapter.  It must also be noted that unlike EXTFSK, FSK generation on an LPT port is not possible.

If you are using a Microham "USB Interface II", or an interface that keys FSK on DTR instead of TxD, then you need to select "Software generated FSK DTR".  Most FSK interfaces key FSK on TxD.  If you have a CW interface that keys CW on DTR, you can use this interface to key FSK with WL by using "Software generated FSK DTR".

Software-generated FSK will work with either a simple homebrew transistor FSK keying circuit or with commercial interfaces that offer FSK keying.  For more information on Software-generated FSK, click here.

Setup Font/Window Screen

The only options available on the Plug-in Font/Window Setup screen (fig. E) are the Waterfall and XY Scope options.  The reason for this is because fonts for the Rttyrite window are set in the Fonts... option in the File menu (see fig. G)


The only options are to change the color of the Waterfall, change the colors of the XYScope and Reverse rotation of the XYScope.  Changing colors is simple enough, but what is "Reverse rotation"?  This option allows you to reverse the rotation of the pattern in the XYScope.  This can be a very helpful tool when tuning RTTY using the XYScope.  When tuning up or down the band with your VFO and you come upon a RTTY signal, the XYScope will show the pattern "sloped" one way or the other until you have the signal tuned on frequency.  If you are tuning left to right on your VFO knob but the pattern on the XYScope starts out right to left, click the Reverse rotation check box.  This way as you tune left to right, or vice versa, the slope of the pattern in the XYScope will change in the direction you are moving your VFO.  I find this helpful when tuning RTTY signals while in the S&P contesting mode.

The Setup Misc Screen is discussed on the next page.

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