Digital Master 780 DM780 CW Send CW Interface – How To


I'm an Amateur Radio enthusiast. I love the hobby and experimenting with radios, antennas and software. On my YouTube channel I upload videos on the Icom 7300 and Icom 7610 along with Ham radio software programs. I hope to inspire people to try new things in Amateur Radio.

6 Responses

  1. Colyn says:

    I use a 7300 as well as a 7610 and I enjoy reading all the information about the sets very useful.
    The one comment I have between the two set is concerning the preamp. 7300 Preamp 1 and 2 work on all bands but with the 7610 only preamp 1 works on all bands and 2 works only on the 10m and 6m bands.

  2. K0PIR says:

    Hi Colyn,

    Nice to hear from you and thank you for commenting here. That’s similar to what the manual says about the preamps. On the 7300:

    P.AMP1: Wide dynamic range preamplifier.
    It is most effective for the HF low bands.
    P.AMP2: High-gain preamplifier.
    It is most effective for the higher bands.

    Icom includes a little more detail in the manual for the 7610. I don’t know why they would be so different though. I haven’t tried between the two, but I will now.

    I normally don’t use the P.AMPs, but this time I was trying it with CW to see if it helped with raising the CW signal so the software could decode better. P.AMP1 may help on some weaker signals.

    Thanks for the information and your input. I appreciate it.

    Best 73,
    Rich, K0PIR

  3. Dave Borchard says:

    I think you are using the W1GEE DB9 to 1/4″ CW cable. I ordered that cable from the N3FJP CW web page. You also had a link to a USB to 1/4″ CW cable. Does that also work to key the CW on a 7610?

    • K0PIR says:

      Hi Dave,
      Nice to hear from you and thank you for commenting here.

      Although I have not tried it on the 7610, I see no reason why it wouldn’t. The USB to 1/4″ does work very good on the 7300. I made multiple QSO’s with it using DM780 and I couldn’t tell a difference between it and the other CW interface. I’ll be using it when I am mobile and portable.

      Thank you again Dave and best 73!

      Rich, K0PIR

      • John Zempel says:

        Just tried setting up my IC7300 with DM780 to use transmit CW. I plug in the USB to 1/4 in. Interface cable, rather than a com port it shows up as “USB PnP Sound Device” in device manager. And DM780 dosen’t key the radio to transmit. Any suggestions? Thank you. John Zempel KG4OLG

  4. K0PIR says:

    Hi John,

    I have one of these, USB CW Interface.
    It shows up under Ports (COM & LPT) as USB-SERIAL CH340.
    Is your computer software (OS) up to date?
    Try unplugging it and plugging it back into another of your computers USB ports.
    USB CW Interface

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