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How does one setup fldigi for PTT using a SmartSDR Cat generated comport?

W5UN_Dave Member ✭✭
edited February 2020 in SmartSDR for Windows
I am a complete novice when it comes to fldigi. Can someone help me set up for PTT from a comport assigned by SmartSDR CAT? I've tried several approaches, none of which work.


  • jim
    jim Member ✭✭
    edited February 2020
    well DAVE i can't help i tried today with no joy i looked at the video got it to receive but never could get it to transmit
  • DonS
    DonS Member ✭✭✭
    edited January 2020
    Set up a PTT comport through SmartCAT. Set it up for RTS not Shared nor Dedicated. In fldigi go to Configure/RigControl and select the Rig CAT tab. Make sure "CAT command for PTT" is NOT checked" then press Initialze button. Then go to Hardware PTT tab and select "Hardware PTT using the lower comport number of the pair generated for Device. Also check the "Use separate serial port PTT" and also check "Use RTS" then initialze and save.
  • Robert -- N5IKD
    Robert -- N5IKD Member ✭✭
    edited March 2015
    This is my settings in Fldigi. I got the SmartSDR.xml from the Fldigi web site.
  • W5UN_Dave
    W5UN_Dave Member ✭✭
    edited February 2019
    I've tried both methods shown above with no luck. I must be doing something wrong, but I don't know what. Do either of you use Teamviewer? If so, and if you are willing, you could take a look at my setup.
  • W5UN_Dave
    W5UN_Dave Member ✭✭
    edited November 2016
    OK Guys, I finally got it working, using Don's method. I has to do a system recover and reinstall SmartCAT, and that seemed to do the trick. Not sure why, but hey, it works!
  • William Hein
    William Hein Member ✭✭
    edited November 2018
    I have 8 physical serial ports on my PC. How do I connect to fldigi from SmartSDR / SmartSDR CAT? flidig only seems to have COM 1 thru 8 available for connection.
  • DonS
    DonS Member ✭✭✭
    edited January 2020
    There is a default com port set up in SmartCat and it is usually defaults to port 4 but not always. especially if there are already other devices using port 4  This is the port you would use for Cat info.   What you can do is physically change com 4 on you PC which I am guessing is one of the 8 physical ports assigned your PC from the 8 port serial card to to some port number out of the range  of 1 through 8 or 9.  In order to do so go into Control Panel then look for Device Manager. In Device Manager you will see a listing for Ports (COM & LPT)  This will show the assignment of all COM Ports.  Select COM4 and right click then go to Properties then to Advanced.  This is where you can change the assigned port to another com port freeing up COM4 for SmartCAT.  If you are not using all the physical com ports I would change the ones you are not using to something in the range of com 30 or higher. SmartCat assigns in pairs e.g. com4-com14, com5-com15, etc.  When you assign to external programs use the lower number and SmartCAT will use the higher number of the pair. You can create additional com ports through SmartCAT for keying , and additional CAT ports if needed.  Make sure after you physically change the com port or ports you reboot the pc.  After ther reboot go back in and check the com ports and then if you have com4 available start SmartCAT and the your Flex.  You will be able to see the assigned default port in SmartCAT.  Hope this helps.

  • terry
    terry Member
    edited July 2019
    I created h/w PTT after I created a port just for FLDIGI.  Used info from Don in post above for reference.  Most important point is to reboot the PC. TX will not work without reboot.  FLDIGI working FB now.  Thanks for the posts.

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