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  1. NX5DX

    NX5DX Ham Member QRZ Page

    can anyone tell me how to set up an Icom 761 to a sound card for MixW PSK32 software?
    I would like to use the ACC 1 if possible. I have tried everything but am not having any success!
    Any help will be appreciated.

  2. KB9UMT

    KB9UMT Ham Member QRZ Page

    Hi Mike NX5DX:

    I did not see anybody reply and I hope you get a direct user of a ICOM 761 that does use it for digital modes (MIXW..etc). But until you do there is lots of documentation on the Internet that might help you. Remember keep it need only a sourse to get RX audio ("IN" or MIC") from your Ham Radio (Phone Jack, back acc rx jack etc) and then you need a way to get the TX audio from the PC (software) soundcard ("OUT") back over the the Ham Radio (like the mic, acc plug, phone patch jack etc) some links to help you:

    Homebrewing can be free if you have the materials in your junk box or up to maybe aound $10 bucks. Here are some commercial links incase you just want to buy one and be done with it.....est. cost below link:
    (cheapest and works well....$40 new
    (Rascal....good...and around $30 bucks for kit and $45 built will see them used from $25 to $40)
    (Rigblaster...good...but the most $100 to $ will see them used from $50 to $80)

    hope this helps some....let me know how you make out of if you need additional help....I also am willing to test it with you anytime once you get her hooked up.

    GL and once you are hooked up to the soundcard there are many many other things you can use it for in Ham Radio!

    de kb9umt Don EN50
  3. AG3Y

    AG3Y Guest

    I am not explicitly familiar with your particular Icom, but I do know that every Icom I have had experience with uses a microphone with a built-in preamplifier.  This means that you must put a lot higher level from the soundcard into the radio than most other radios require.  In a way, this is a blessing, because you can do away with all the transformers, level droppers, etc. that are used by so many hams.  

    Just figure out from your schematic, which pin is the "audio in" and couple that to your soundcard with a .1ufd capacitor!  Make sure you are using that capacitor, because Icoms use a "phantom power supply" to provide the voltage to that built in preamp I was referring to.  If you do not use it, you could possibly damage the radio, soundcard, or both!

    Preset your mic gain at about 1/3 to 1/2 full level. Start out with the  TX level on the soundcard mixer at a fairly low level, and slowly increase it until you start seeing RF out when in the transmit mode.  If you are testing the setup in the PSK31 mode, stop when you start seeing ALC action.  This mode needs very little RF level to work extremely well!  The most important thing in PSK31 is producing linear RF with clean switching from phase to phase.

    At first, you may have to manually activate the transmit key.  If everything is working correctly, you should be able to use your VOX to control your transmitter!  In order to do that, you may have to advance your Vox gain control and fiddle with the associated settings a bit.  If that doesn't work, you can always incorporate the PTT circuitry that can be found almost anywhere there is a discussion of the soundcard digital modes here on the internet.  Information about the PTT pin should also be shown on your schematic.  PTT almost , if not always requires a simple connection to ground.  Again, the circuits are readily available on the internet.

    I have been running all my soundcard modes using the vox method very sucessfully, and have had many unsolicited reports on how good my signal looks on the "waterfall".  Typically, I receive IMD reports of -25 or better!  And all of this using a 15 year old or older IC720A!

    Good luck to you!  If you have more specific questions, I will do my best to answer them for you, or find someone who does have the answers!
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