Icom 7610 N1MM One Cable RTTY FSK CW – How To

In Icom 7610, Software by K0PIR35 Comments


The Icom 7610 N1MM configuration is simple and similar to the IC-7300. We now have two virtual COM ports on the IC-7610. Let’s see what else is new! When I got the IC-7300, it was a real thrill to operate RTTY (FSK). Sliding the IC-7610 into its spot, the 7610 just took over where the 7300 left off. I can’t say right now if the improvement in operating is substantial, but I love its smooth and quiet operation.

I posted an article getting the 7300 running on RTTY (FSK) with MMTTY. You can find it here.

Getting the most out of your radio?

Please join our growing Icom 7300/7610 community.

I agree to have my personal information transfered to MailChimp ( more information )

Receive e-mail notifications of new articles. I will never give away, trade or sell your email address. You can unsubscribe at any time.

Icom 7610 N1MM

Icom 7610 Comments

I have had the Icom 7610 for a little over a week now and WOW! What a quiet and smooth transceiver. QSK is silent and fast. Operating digital modes, like FT8, is so quiet, I hardly know I’m transmitting. I’ve pulled out some pretty weak signals using the filtering and I’m very impressed with the RX. The TX audio quality is similar to the IC-7300. A few have said it sounds like my Icom 7300! I am using the same mics I used with the 7300, the Yamaha CM500 and the BM800. I will get a good quality dynamic mic to try out. The Icom 7610 LCD touch screen is outstanding. Noise blanker, noise Reduction and notch filtering are superb, the best I have seen.

Icom 7610 N1MM

Icom 7610 N1MM and MMTTY

As a prerequisite, always install the Icom 7610 USB driver before connecting the USB cable. N1MM Logger, MMTTY, EXTFSK are the software programs for RTTY (FSK) being used with the Icom 7610. It’s a great combination of software. With N1MM Logger+ we also get a nice Spectrum Display (waterfall) on the PC monitor. N1MM Logger+ also has the Icom 7610 listed in rigs.

The Spectrum Display is relatively new and a lot of fun to use. It is only available on a few select radios and the IC-7300/7610 are included.

I am presuming readers are familiar with N1MM and MMTTY and have them installed. If you don’t, both are pretty straight forward installs. I’ll put links below.

Icom 7610 Internal Menu Settings

Pay close attention to USB SEND/Keying. The Icom 7610 uses two virtual COM ports and we use one USB 2.0 cable. I have a short video on this.

Icom 7610 N1MM Logger Plus, MMTTY, EXTFSK64 Configuration

What’s new? There are two virtual serial (COM) ports on the IC-7610. We can use one for rig control and the other for keying.

With one cable we get RTTY (FSK) and the Spectrum Display. This isn’t possible with the IC-7300 unless additional software (VSPE or similar) is used.

If you haven’t seen it in action, have a look at this: http://www.k0pir.us/n1mm-logger-spectrum-monitor/

No additional software to create virtual COM ports is needed. Nice!

Everything you need, including the Icom 7610 internal settings, are in the video. When it gets to the MMTTY configuration, pay close attention to the settings and especially EXTFSK64. N1MM Logger Plus configuration is included and it works perfectly for me. There are a couple of tips in the video. See the pinned comment I posted.

Icom 7610 Fldigi

If you want, you can download and install Fldigi for CW decode. Fldigi integrates with N1MM Logger Plus. Install Fldigi and when you open N1MM Logger Plus go to Config>Configure Ports>Digital Modes and tell N1MM Logger the Fldigi path. It’s in the video too.

Icom 7610 Reviews

On eHam.net the reviews are coming in. I think one should be removed, because it is incorrect and I don’t believe the reviewer owns the IC-7610.

Rob Sherwood, NC0B, has done a preliminary review and points out a couple of helpful tips. I’ll leave it to him to tell you. Please see Icom 7610 Review on eHam.net.

Icom 7610 N1MM Wrap Up

Thank you for coming by and I hope this helps. I know it can be frustrating at times to get it all working smoothly, I’ve been there before and I still make mistakes. It’s Amateur Radio, hi hi.

I hope you find this informative and useful even if you don’t own a Icom 7610. Maybe you’re waiting for one or researching. Whatever the reason for visiting my website, I appreciate the comments.

Please comment below.

Download Links:

Icom 7610 USB Driver Download Page from Icom

USB Driver Installation Guide from Icom

N1MM Logger Plus Full Install



Sherwood Engineering HF Test Results – Icom 7610




  1. Hi,
    I’m looking for how to use my Icom 7610 with CW Skimmer directly, connecting USB cable 2.0 back radio and running cwskimmer on the pc, without using HDSDR.I tryied it but it decodifies bad cw received.Is there any option to set ?
    Thank you .
    Claudio IK0QKN

    1. Author

      Hi Claudio,

      Nice to hear from you and thank you for commenting here. I haven’t tried that and I do not know of any other settings. I would try HDSDR and see if it works properly and go from there.

      Thank you again and best 73!

      Rich, K0PIR

  2. Looking for help re PSK31. Screen presentation in one big lump. Using Digipan. Used it before thru a rigblaster with no problems. 7610 is not treating me very well.

    1. Author

      Hi Lee,

      Nice to hear from you and thank you for commenting here.

      It’s probably just a setting or two in the receiver. Did you setup the receiver for digital modes?

      Have a look at this article and video on receiver settings with the 7300. It is very similar to the 7610.

      See if that helps. You’ll love the 7610 for digital modes. It is very quiet.

      Best 73,
      Rich, K0PIR

  3. I setup MMTTY to work standalone. I found that I had to change the USB Send menu such that USB-1 B is set to RTS to get MMTTY to modulate. Your video had it set to USB-1 A to RTS.

    I don’t understand how you got N1NM and MMTTY to modulate because extfsk64 offers settings for just one com port. In my case port 7. I think it is 5 for you.


    1. Author

      Hi Brad,

      On mine I am using USB1(B) DTR. That’s what is keying the EXTFSK64 (COM5).

      I think you can ignore the USB1(A) RTS in the radio setup. That is my COM4 and I use it for rig control.

      Rich, K0PIR

  4. Yes, it sounded good to me, especially after I made a contact.

    Do other programs like Fldigi allow clicking on a waterfall or do you tune the VFO like DM780?


    1. Author

      Fldigi doesn’t do RTTY FSK, it’s AFSK and is very nice and yes you can click and tune like in PSK mode.

      Rich, K0PIR

  5. Rich,

    I thought I posted this comment already so my apologies if it shows twice. I was able to male a RTTY FSK QSO using DM780. The trick is setting the water fall to 2210 and tuning with the VFO. Yes, the reverse button needs to be on because all DM780 programs are written for USB.



    1. Author

      Thanks Brad, glad to hear it. That’s the thing with DM780, the waterfall and then tuning with the radio.

      Did you get it to sound right when you made the contact or did it still sound a little odd?

      Rich, K0PIR

  6. I made a DM780 RTTY FSX qso. The waterfall has to be set at 2210 and it stays there. You tune using the VFO, not via the waterfall because the 2210 waterfall setting will change. Yes, “Reverse” on because all of HRD’s apps are USB upper and RTTY is lower.


  7. I tried DM780 FSK, it modulates a RTTY signal but it sounds funny. Not sure if I should run reverse or not. Have not made any contacts but it is early afternoon Sunday and the bands are quiet.

    I once say a video that said the waterfall has to be set at 2120 or something close to work????

    CW did work.

    1. Author

      Yes, exactly, I was having the same problem. When it sounds like that, others will not be able to decode.

      I was told by HRD to enable the “Reverse” button at the top toolbar, that way I can decode, but I was not able to make a successful TX.

      It was working for me at one time, but that was a few versions back.

      I want to look at it some more.

      Rich, K0PIR

  8. Rich,

    I gave up Win4IcomSuite. It’s radio control screen is much better than HRD but I would rather use the radio itself. Much more fun. I see what you mean. Win4IcomSuite ties up the first com port (A) for rig control when you can use a Ci-V cable with HRD. Win4Icom does not support CI-V.

    Followed all your steps screen by screen, field by field and have N1NM working with MMTTY now. I was never able to get it to work with my Yaesu FTDX 5000.

    Thanks a bunch. I really appreciate the videos.

    So what are we going to do with that second blue USB port on the back of the rig?


    1. Author

      That’s great Brad. Thanks for commenting. I have been doing a little RTTY lately, so maybe I’ll see you on the air.

      I still haven’t tried DM780 and RTTY FSK since the new HRD update. I was using WinWarbler this past week. I’ll have to try out DM780 and RTTY FSK.

      Thanks for commenting and best wishes to you and yours.

      Rich, K0PIR

  9. My version of mmtty does not have EXTFSK64 only EXTFSK. I assume that EXTFSK will work ok or do I have to download the EXTFSK64.

    1. Author

      Hi Roy,

      Nice to hear from you and yes, give EXTFSK a try. Are you on a 64 bit system?

      Rich, K0PIR

  10. I used your video to setup my new 7610 and N1MM but now the 7610 goes into Transmit mode after about 5 seconds after power up and no matter what I have tried I can’t get it to stop other than powering get down. It was something in the setup because it worked fine before I started making the changes you suggested in the 7610 to use with N1MM. I really don’t want to do a factory reset to lose all of my settings on the 7610 but I may have to. It is now unusable. Help!

    April 6th 2154 UTC


    1. Author

      Hi Craig,

      Nice to hear from you and no problem. It is probably just an RTS setting in the software. That is most common. I would look at the software first and there must be something set in RTS that shouldn’t be. In N1MM Config my RTS is set to PTT. If you can’t find the problem, go to the radio and Menu>Set>Connectors>USB SEND/Keying. Mine is USB SEND = USB1 (A) RTS. If that is not working for you try to turn it OFF. But, if everything in the software is as I have it, it will work.

      Sometimes it’s just a setting that is overlooked.

      I believe that will do it for you. Please let me know and thank you so much for commenting. It will help others as well.

      Rich, K0PIR

    1. Author

      Hi John,

      Nice to hear from you and great question.

      Short answer, no.

      I wish it did. I am using CW Get with WinWarbler in the DXLab Suite. Although I haven’t tested it much, it appears to work very good.

      I used HRD and DM780. DM780 was pretty good at decoding. Fldigi is also a favorite and I’ve found it works very good with N1MM Logger+.

      Rich, K0PIR

  11. Hi Rich,
    Just opened my new IC-7610 and watched all your videos.
    I am experienced for 2 years with IC-7300.
    In your video you say:
    “As a prerequisite, always install the Icom 7610 USB driver before connecting the USB cable”
    I cannot find nowhere this f… driver
    When I connected the USB cable, my device manager reports COM6 & COM7 (in your video is 4 & 5).
    Do I need a driver?
    The MMTTY does not make TX on the transceiver.
    The whole setup is OK.
    Please for any kind of answer…Thanks Alex SV2BXA

    1. Author

      Hi Alex,

      Great to hear form you and congrats!

      If it’s working and the COM ports are working, I don’t guess you need too. It probably wouldn’t hurt though if you start having problems.Here it is, look for the USB driver 1.2 https://www.icom.co.jp/world/support/download/firm/

      If it’s not transmitting FSK and you have EXTFSK installed, does EXTFSK show any transmission in it’s window? Is it keying the rig? If it’s not, I would install that driver and have a look at the settings again. It’s probably a setting that is off.

      Rich, K0PIR

  12. Good Morning Rich

    All working, Factory default on ALC was 5% way to low

    Thanks for your help and video’s

  13. Yes radio is in RTTY mode
    with power at 100% I have no power output
    The scope shows that it is transmitting
    Power meter =0
    SWR meter =0

    1. Author

      I am unable to create that problem. I would go back and have a look at the settings in the radio under connectors again. Maybe something is amiss.

      However, I did manage to mess up my CW keying LOL

      I’ll post anything I find out Bill.

      Rich, K0PIR

    2. Author

      My problem was in N1MM Logger Plus Config. Bill, go back and look at that part again in the video. After configuring it just like the video, I am back to 100% RTTY FSK and CW.

  14. Hi Rich

    More progress made today, in N1MM I do have dittles and it does key the radio, I have no power out on the radio, Am I missing a setting

    On DX Labs I do have rig control but no power out on RTTY also.

    What am I missing here????

    Thank you in advance for your help

    1. Author

      Hi Bill,

      That’s great! Sounds like you are on the right track.

      Do you have the radio in RTTY mode? I put my radio in RTTY mode, turn the power to 100%, push the transmit button and I get 100% output. When I transmit with MMTTY (N1MMM) same thing, 100% output.

      Does that work?

      Rich, K0PIR

  15. Hi Richard and the group

    Am I reading this correctly, that I no longer need any type of interface???
    Right now I use a home brew level converter that’s worked perfectly with my Icom IC-7600.
    The 4 programs I use are N1MM, DX Labs including winwabbler and WSJT-X along with JTAlert

    I do want to use true FSK

    1. Author

      Hi Bill,

      That’s correct, no external interface, just a USB cable and the drivers. Download and install the USB driver from Icom before connecting the USB cable. Have a look at the videos.

      It works FB and you’ll love it.

      Rich, K0PIR

      1. Hi Rich

        OK on N1MM, I do have rig control, radio receives rtty ok, radio does go to transmit when a macro is pushed but no dittles. any ideas with that

        With DX Labs commander, nothing, no rig control at all

        Would you be available for a team viewer session???/

Leave a Comment