Welcome to the new FlexRadio Community! Please review the new Community Rules and other important new Community information on the Message Board.
If you are having a problem, please refer to the product documentation or check the Help Center for known solutions.
Need technical support from FlexRadio? It's as simple as Creating a HelpDesk ticket.

Any FSK support on 6400/6600?


The last post I saw on this topic was in February of 2019 so I thought since I’m new here, I would check the state of FSK in September 2020.

Does the Flex 6400 support FSK? Or is it limited to AFSK?

Same question for the 6600.


Tom NY4I

Best Answers


  • thomasmschaefer

    A friend asked me for some help with setup. FSK is always what we have used. You still need to watch overdriving the audio with AFSK but I agree it is simpler with a Flex.

  • KD0RC
    KD0RC Member, Super Elmer Moderator

    Yes, excellent point. With FSK, it is just on/off keying. With AFSK, you need to watch the meters to be sure you are not over or under driving.

Leave a Comment

Rich Text Editor. To edit a paragraph's style, hit tab to get to the paragraph menu. From there you will be able to pick one style. Nothing defaults to paragraph. An inline formatting menu will show up when you select text. Hit tab to get into that menu. Some elements, such as rich link embeds, images, loading indicators, and error messages may get inserted into the editor. You may navigate to these using the arrow keys inside of the editor and delete them with the delete or backspace key.