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How are CW keystrokes transported from the Maestro to the FlexRadio ?

Bill Bailey
Bill Bailey Member ✭✭
in SmartSDR API

I am interested in constructing a WIFI/RasberryPI CW paddle keyer. I can not find any information in the API description that describes the CW data flow from the Maestro to the Flex.

Has anyone considered doing this ?

Best Regards,

Bill Bailey

Best Answer

  • KD0RC
    KD0RC Member, Super Elmer Moderator
    Answer ✓

    Hi Bill, IW7DMH has done this as well as RemoteKeyerInterface on Groups.io. Check both of these websites for more info on how they are accomplishing it. I am currently experimenting with the IW7DMH code, but I just got started on it this morning (thanks for the motivation @Mike-VA3MW !). As I get more into the inner workings, I will post back here with my progress.

    So far I have the listening side ported to a Teensy 4.1 (PJRC.com). It compiles and runs, but can't yet tell if it is actually working. This afternoon, I will see if I can communicate with it using the internal keyer in my TeensyMaestro.

    I don't know how the Maestro does it, but the people doing it now seem to use a dedicated board like an Arduino or Raspberry PI to physically key the Flex using the key jack or accessory jack. This is the approach I am taking with the IW7DMH code that I ported over from the Arduino platform.

Answers

  • Martin AA6E
    Martin AA6E Member ✭✭✭

    I've wondered about this, too. It seems like a difficult problem if you want QRQ (fast) sending over a flakey wifi/internet connection. I suppose the Maestro could send a key down or up UDP packet. But then a dropped packet could latch up the Tx. Etc.

    Someone should measure timing jitter from key down to RF out just for fun while working remote.

  • Bill Bailey
    Bill Bailey Member ✭✭

    Multiple samples per dot or dash might cure your latching problem. Multiple samples makes it a level detection scheme rather than an edge scheme. Just supposing.... I am hoping that the Flex Help desk guys can shed some light on this.

    B.B.....

  • KD0RC
    KD0RC Member, Super Elmer Moderator

    One thought I had is to send 8 bit WPM followed by 1 for dot or 3 for dash. This two byte packet would not leave it in xmit, even with dropped packets. This would only work for keyer or keyboard generated code. For hand keying, a start and stop code with a 100 ms time out might work. Tricky business, this!

  • Bill Bailey
    Bill Bailey Member ✭✭

    Flex has solved this problem, I am hoping they will share the technique..

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