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  • August 19, 2015 at 1:21 pm #1304
    Joseph, N8CN
    User

    I had this issue with the previous beta, and now also with Raspi-2 Beta 3:
    Thu Aug 6 12:42:29 2015: Starting logic: SimplexLogic
    Thu Aug 6 12:42:29 2015: Loading RX: Rx1
    Thu Aug 6 12:42:29 2015: Loading TX: Tx1
    Thu Aug 6 12:42:29 2015: open serial port: No such file or directory
    Thu Aug 6 12:42:29 2015: *** ERROR: Could not initialize TX “Tx1”
    Thu Aug 6 12:42:29 2015: *** ERROR: Could not initialize Logic object “SimplexLogic”. Skipping…
    Thu Aug 6 12:42:29 2015: *** ERROR: No logics available. Bailing out…

    Nothing works.. COS doesn’t trigger anything, neither does an input signal with VOX set.

    Steps to reproduce:
    Burn SD card
    Change hostname
    Program callsign and frequency, save.
    Rebuild/restart underlying svxlink services.
    Examine the log.

    August 19, 2015 at 11:27 pm #1311
    Aaron, N3MBH
    Forum Administrator

    This one looks weird. It shouldn’t be loading “SimplexLogic” at all. That’s an indication it is loading the wrong config file. Check the recommendations I just posted in your other topic regarding port settings.

    Also, if you are trying to start/stop svxlink via SSH, make sure you are using “service svxlink stop” and “service svxlink start”. Just typing “svxlink” will not work as expected and give you the above results. OpenRepeater runs svxlink as a service and not as cli.

    73,
    Aaron – N3MBH / WRFV871

    OpenRepeater is offered free of charge. Find out how you can support us.

    September 1, 2015 at 2:52 pm #1369
    Joseph, N8CN
    User

    I have it working now – the missing ingredient appeared when I connected all three of my USB audio cards. — it started without error!

    .. but why?

    The default settings in beta3 are:
    RX Audio Device : alsa:plughw:1
    TX Audio Device : alsa:plughw:1

    Anyway, something was working. I plugged in speakers to each USB fob. Audio was coming out of one of the channels on the 2nd fob to be recognized.

    This told me that audio device numbering must start at ZERO instead of ONE.

    I changed it to:
    RX Audio Device : alsa:plughw:0
    TX Audio Device : alsa:plughw:0

    then rebooted.

    It fired right up. Not only that, it works with ALL THREE of my USB audio dongles.

    Success!!

    Also conquered the GPIO issues I had been encountering.

    Settings working for me:
    RX Mode: COS
    RX GPIO Pin: 22
    RX Audio Device : alsa:plughw:0
    RX Audio Channel: 1
    TX GPIO Pin: 27
    TX Audio Device : alsa:plughw:0
    TX Audio Channel: 0

    From the audio in/out and GPIO, I connected through the EasyDigi unit I’ve had for a while (and never previously used). Radios send a ground out when COS happens, so a pull-up reference was necessary.
    Pull Up and Pull Down GPIO reference for COS

    Things were a little inconsistent. The fix was to make common the RPi Ground, EasyDigi “DigGND” and the ground signal on the radio. (relying on the ground isolation in the EasyDigi led to issues… Inconsistent COS, no open trigger at times, false open trigger at times).

    I used two Motorola Maxtrac units I had laying around. They lend nicely to UHF work. Using the LAB RSS you can turn the radio down in power very linearly. It’s capable of 40W, and I had mine turned down to half a watt for testing. It’s been running for a few days without much issue, so today I bumped it to 15W. With some horizontal and vertical separation, it’s actually working nicely without a set of duplexers (haven’t tuned them yet)..

    Next step is to move from breadboard to shielded and streamlined.

    Will likely build a case that holds both radios and a space for the RPi, 12V-5V 1A converter, EasyDigi and other circuit stuff, and a fan on the back.. voila, portable repeater.

    Bonus plans: USB to SERIAL port for local console access, which can be used to program the Pi in the field to connect to a nearby WiFi network (via already installed USB WiFi dongle).

    Anyway, I’m up and working with favorable results..

    (the audio quality is supar!!)

    Joe

    September 1, 2015 at 3:11 pm #1372
    Joseph, N8CN
    User

    Ack, I pasted the wrong URL above for the GPIO Pullup reference I ended up using. Here is the correct diagram for what I am using on the COR/COS from radio to RPi (low/gnd when signal is present):

    Raspberry Pi GPIO Pullup Reference for low-active COR/COS

    September 7, 2015 at 11:15 am #1390
    Aaron, N3MBH
    Forum Administrator

    Joe, here is an example with an optocoupler.

    opto-pullup-circuit

    73,
    Aaron – N3MBH / WRFV871

    OpenRepeater is offered free of charge. Find out how you can support us.

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