Digital - MMTTY for RTTY support

MMTTY Windows

• the Digital Interface window 
• which is equal for MMTTY, MMVARI and external Interfaces. More information about external interfaces in the chapter 'Digital - External TNC Support'.
• the MMTTY engine window - 
• there are two versions which can be selected in the Digital Interface menu under Settings.
• Small version MMTTY engine window

• Large version MMTTY engine window

Download, configure and test MMTTY

Download MMTTY

• Download the current release of MMTTY (check links chapter for url)
  • At least version 1.64 is needed.
• Run the setup program and install this to your computer (preferable) in its own directory
  • Don't install in the N1MM logger directory when using a MMTTY version from before July 7 2002. When uninstalling MMTTY all files in the install directory will be deleted and with that also N1MM logger. MMTTY version 1.64 uses a new installer and does not have this problem anymore.
• The NewExe contains the file XMMT.ocx needed for MMTTY version 1.64 or higher and should be in the N1MM Logger directory after an update.

Configure MMTTY

FSK KEYING

1. Open the Configurer (Configure Ports, Telnet Address, Other in the Config menu).
• Select the tab 'Digital Modes' 
  • Select Soundcard as your Interface type.
  • Select for the selected Digital Interface as MMTTY Mode FSK
  • Select the path to your MMTTY directory, preferable not the same directory as N1MM logger is installed in.
• Select the 'Hardware' tab
• Place a check mark under the Digital column that you are using for the digital port.
2. Save and exit.  
• If MMTTY is already loaded you will probably get an Error message about not being able to open port xxxx.
3. Open the 'Digital Interface' (under the Window menu) and MMTTY will load.
• Select: 'Option/Setup' in MMTTY.
• Select the TX tab. and set your serial port that you will be using for FSK keying and data.
• Close the Setup dialog
• Close the 'Digital Interface' to have MMTTY save the settings.
4. From this point every time the Digital Interface loads it will NOT pass the port info to MMTTY. MMTTY will load the the serial settings from it's own settings file.

1. Load up MMTTY (in what ever directory you have set in the loggers setting) in standalone mode and set the TX port to Com1. Close that out.
2. In N1MM logger under the 'Hardware' tab in the Configurer make sure that you have a digital check mark next to Com1 and in the settings section of that port put RST = PTT. 
3. Next switch to the 'Digital Modes' tab and make sure that the MMTTY settings show FSK instead of AFSK. 
4. Save the settings and close N1MM logger. When you open MMTTY it should be set to use Com1.

Using the RIGblaster interface for FSK with N1MM/MMTTY combo.

The default for FSK via MMTTY is TXD. You'll need to change the jumpers when using a Rigblaster. Also, make sure you get MMTTY working as a standalone first. Then you should just be able to specify MMTTY (select Soundcard) in the Digital Interface config in N1MM and it should take off. If you are lucky enough to have a radio where PTT is asserted via radio control ( Kenwood is one) then leave the PTT unchecked in the port setup and checked in the PTT via rig control portion.

AFSK KEYING

1. Open the Configurer (Configure Ports, Telnet Address, Other in the Config menu).
• Select the tab 'Digital Modes' 
  • Select Soundcard as your Interface type.
  • Select for the selected Digital Interface as MMTTY Mode AFSK
  • Select the path to your MMTTY directory, preferable not the same directory as N1MM logger is installed in.
• Select the 'Hardware' tab
• Place a check mark under the Digital column that you are using for the digital port.
2. Save and exit.  

SO2R : In order to use 2 copies of MMTTY you need to have 2 different keying comports setup for MMTTY to use. Also the second serial port must be a higher number than the first.. More info can be found in the SO2R chapter.

Testing MMTTY

MMTTY is also a stand alone application. So testing can be done outside N1MM logger.

Two radio setup

For 2 radio operation where you are using 2 separate soundcards You should be setting the soundcards to their respective soundcard number.  These settings can be found  on the TX tab under 'Option/Setup' from MMTTY. When not correclty set up send info on radio 2 will print out on the DI1. 

When using one soundcard using the right/left channels it sometimes helps to set the soundcard number to  -1 on radio 2 and 0 on radio 1. 

Using MMTTY

• The macros for the Interface using MMTTY are different from the way they work with the TNC . What ever you put in the macro will get transmitted. There is a macro keyword needed to turn TX ON {TX} or TX OFF {RX}.
• There is no special abort macro needed for use with MMTTY just using the ESC key will stop transmitting.
• The TX and RX buttons are for the free form typing in the TX window.
• When MMTTY loads it loads the last used settings when the Interface was closed.

How to tune RTTY

• Use the VFO on your radio and dial in the peaks to match the 2 yellow lines on the spectrum
• Click view and the X-Y scope
• Make sure you click the "ham" button for proper shift etc.
• Probably set AFC off..when you are in a crowded section of the band and manually tune the signals
• Also in crowded sections its helpful to use the built-in notch and bandpass filters
• Make sure to use LSB

Periodically you get a lost sound indication in the MMTTY window and the program quits responding to RTTY.

• This should never happen but when it does it happens every 20 minutes or so. Try increasing the priority with which MMTTY runs from its default "high" to "highest". This is one step below the maximum "critical". This setting is in MMTTY under Options, Setup MMTTY and the MISC tab..... Mostly the transition from RX-TX-RX is much smoother.

When should I use AFC

• Use AFC (automatic frequency control) when MMTTY should automatically track the incoming RTTY signal.
• With AFC and NET turned on, MMTTY will track the incoming signal and also keep your transmitter frequency locked to the received signal when using AFSK.

  When MMTTY is set to transmit FSK, AFC will work on receive only. When in "Running" mode, you want to keep your TX frequency stable, but with RX AFC set on you can pick up stations who reply a bit off your frequency and copy the exchange without losing your TX spot. Just don't let the AFC spread get too far from where you're transmitting.

• A nice option to use is: AFC On/Off with CQ - If set then the AFC will turn on with CQ message or TU messages. This way when Running the AFC is on and during S&P the AFC is off. Check it.

When should I use the NET option: NET On/Off with Run Change

• When in 'Search and Pounce' mode the program will check the NET option, your signal will track any drift on the person you are calling and working.
• When in 'Running' mode the program will uncheck the NET option, you don't want to 'follow' the station which is calling you over the band.

Why to use "Auto Update TRX Offset w/Mark Freq."

• Default the mark frequency being used is 2125 Hz. Under the settings menu on the Digital window check Auto Update TRX Offset w/Mark Freq. This way the program will track the mark frequency and will be more on frequency when a spot comes in. When leaving the Digital window the offset is set back to 0 and turned off...