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[How to] Configuring your FT-991/A for Native (FSK) RTTY mode.

Discussion in 'Working Different Modes' started by PY2RAF, Apr 16, 2020.

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  1. PY2RAF

    PY2RAF XML Subscriber QRZ Page

    Hi QRZers and FT-991/A owners;

    I would like to share here a step by step setup guide in order to use the native RTTY encode mode of the 991/A, using RTTY-LSB instead of the Data-LSB.

    The mode RTTY-LSB works by a serial port pin (or the SHIFT pin on the rear port) 'tickle' the radio so the radio can actually 'modulate' the RTTY signal. For correctness, shift the signal. This is named FSK mode.

    I choose to use the RTTY native (FSK) mode due mainly to not having to take care of the audio control/loudness feed to keep ALC in reins - this is all taken care by the radio itself.

    AA5AU gives an great explanation describing AFSK and FSK advantages and pitfalls.
    An tl;dr by me describing each mode is:
    AFSK - You feed the audio to your computer, modulated and ready to be transmitted;
    FSK - You "tickle" the Shift/Serial pin and then the radio will modulate it.

    Advantages, verbatim: I prefer FSK because it’s straight on/off keying into the FSK input of my radio. I don’t have to worry about the audio level or whether I forgot to turn the speech processor off. I can then use the FSK mode on my radio along with the narrow 250 and 500 hz filters. When I switch from SSB to RTTY, I only have to change the mode on my radio.

    In the end, the resulting transmitted signal will be (almost) just the same. I went the FSK route to give some use to the Standard COM Port and use the native RTTY-LSB mode - and I do agree with AA5AU's opinions too.

    So without further ado:

    1. First thing, identify what's your Standard COM port (not the Enhanced!!!!!). Open the Windows' Device Manager. In the below example, it is COM5. Write it down.

    2. Download and install MMTTY (link)

    3. After installing, open MMTTY. Go to menu "Option", select "Setup MMTTY"

    4. Go to the SoundCard tab. In "Reception", choose the interface that contains "USB Audio CODEC". No need to choose an "Transmission" audio card. Do not click OK yet.

    5. Go to the TX tab. In the "PTT & FSK" "Port" clause, scroll all way down to the bottom and select EXTFSK64. Do not click OK yet.

    6. Now, move to the "Misc" tab. In "TX Port", select "COM-TxD(FSK)". Now, click OK and you are all set.

    7. Now, let's configure the EXTFSK. Click the RTTY icon in the task bar, select the below EXTFSK program.

    8. In "Port", select the COM port that you found in Step #1. In FSK Output, select DTR. In PTT Output, select RTS. Click the trace next to the OK status to minimize.

    9. Now, to the radio. Go to the Configuration Clause "060 - PC Keying" - Choose RTS

    10. Scroll down to the configuration "096 - RTTY SHIFT PORT" - choose DTR

    11. Hit the MODE button on the radio, select RTTY-LSB

    12. You are all set!!

    Tune to the proper RTTY frequency in the band, hit the MMTTY's CQ2 button and enjoy!
    UI4F likes this.
  2. PY2RAF

    PY2RAF XML Subscriber QRZ Page

    N5AF, PA5COR and K6CLS like this.
  3. WA9UAA

    WA9UAA Ham Member QRZ Page

    This gets asked often on the other radio boards, a well put together presentation too.
    PY2RAF likes this.
  4. KC1OGS

    KC1OGS Ham Member QRZ Page

    Thanks for the info, very well done. I was curious if you have ever come across any paid software that does all digital modes? I would like to be able to swap between FT8, RTTy, FSK and some others. what do you suggest. thanks KC1OGS
  5. KG7WGX

    KG7WGX XML Subscriber QRZ Page

    As far as I know, there is only the one source for the software which uses FT8. While Fldigi does support a lot of digital modes, it does not include FT8, nor will it likely do so in the future.

    If you want FT8 and other digital modes, you will need to run at least two separate programs.
  6. KC1OGS

    KC1OGS Ham Member QRZ Page

    Thanks. I also just discovered JS8Call which is like texting based on FT8.. Pretty fun but not much traffic. So I got all three installed :).......Need another radio.
  7. CX7BBR

    CX7BBR Ham Member QRZ Page

    Gracias por la información, con respecto a RTTY para 991 que es mio no A pero veo que dentro del menú del 991 hay parámetros diferentes con 991/A. Que no coincide trabajo puerto com 8 y voy usar 10 para esa modalidad.mi conexion es puerto usb del 991 al puerto usb de notbook. 73 Ruben Suarez cx7bbr
  8. WA7OCZ

    WA7OCZ Ham Member QRZ Page

    Thank you for this. I've been struggling with MMTTY. I tried all day once and couldn't get it work. Oddly, the next day I turned everything on and it worked fine! The next day I tried again and it once again it didn't work. I followed the steps here and so far it's up and running. Time will tell. Thanks again.
  9. PY2RAF

    PY2RAF XML Subscriber QRZ Page

    Always connect the radio to the very same USB port at the pc. Changing ports changes the COM port mapping and the sound card as well; botching the entire enterprise.

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