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6500 vara aprs 30 tx issue

Jeff Griffin
Jeff Griffin Member ✭✭
in Third-Party Software

I'm trying to setup my 6500 to run VARA APRS on the VARA 30m frequency of 10148200. I'm getting the 'interlock is preventing transmission' error. I can key the 6500 in CW mode, but not DIGU on this frequency. Problem can be easily demonstrated by testing with the ATU tune button Does anyone know of a fix for this? Thanks...

73 Jeff kb2m

Comments

  • KD0RC
    KD0RC Member, Super Elmer Moderator

    Hi Jeff, can you post a screenshot of SmartSDR when it is having the issue?

  • Geoff AB6BT
    Geoff AB6BT Member ✭✭✭

    Jeff…If your TX bandwidth is greater than or equal to 1800 Hz you will be trying to transmit out of band… if I did my subtraction correctly.

  • Jeff Griffin
    Jeff Griffin Member ✭✭

    TX bandwidth is 600 Hz

  • Geoff AB6BT
    Geoff AB6BT Member ✭✭✭

    Well, I guess you can rule that out!

  • KD0RC
    KD0RC Member, Super Elmer Moderator

    I think Geoff is right. VARA transmits up and down from a nominal center frequency depending on the slot chosen.

    image.png

    In the example above, if I were to transmit in slots 1 - 5, I would be in band. Slot 0 is just barely in band, and slots 11 - 15 are out of band. My Out_Of_Band spot is coming up because my TX High Cut filter is set to 3000 Hz.

  • Jeff Griffin
    Jeff Griffin Member ✭✭
    edited December 2024

    I had to lower my tx bandwidth a bit as I was transmitting out of band. All is now working . Thanks for the replies. I'm also not at all up on how VARA actually works, but plan on getting more knowledgeable as it's fun getting back on HF APRS it's been awhile…
    …

  • David Ahrendts
    David Ahrendts Member ✭✭

    Jeff, I'm trying the APRS setup also on 10.148.200 — but I do not have rig control to transmit a beacon. TCP and DCD are green so KISS appears to be talking to the radio through VARA HF. I do see audio input flowing from the FLEX. What am I missing?

  • Mike-VA3MW
    Mike-VA3MW Administrator, FlexRadio Employee, Community Manager, Super Elmer, Moderator admin

    Keep this in mind:

    VFO Dial Frequency + TX Audio Low Pass must be less then the band edge.

    This is why you can't do USB with a dial frequency of the band edge.

    73

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