Can an SDR simultaneously broadcast on multiple frequencies?

Discussion in 'Software Defined Radio (SDR)' started by VU2TVE, Oct 16, 2019.

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  1. KA0HCP

    KA0HCP XML Subscriber QRZ Page


    Can you identify one or more radios that would be compatible with this GNU configuration? Tnx, bill
    AE8W likes this.
  2. W6RZ

    W6RZ Premium Subscriber QRZ Page

    Sure. In ascending price.


    LimeSDR and LimeSDR mini

    hackRF (mentioned by OP)


    bladeRF 2.0 (MIMO capable)

    Ettus Research (many products)
    KA0HCP likes this.
  3. KA0HCP

    KA0HCP XML Subscriber QRZ Page

    I believe that we are coming from opposite directions to the original question.

    -You: can a software/building block solution be created with desired features.

    -Me: Is there an OTS solution? Existing ham radio? Technical level of implementation, redesign hardware...

    I never had any doubt that software can be configured as desired. I do think there are additional issues regarding amplification to signal level and filtering. Thanks for additional info. bill.
  4. KA9JLM

    KA9JLM Ham Member QRZ Page

    Because you and I are on a different page. o_O

    A SDR dongle is different than a SDR Transmitter that cost a lot more than $20.

    My mistake. Carry on...
  5. VU2TVE

    VU2TVE Ham Member QRZ Page

    So the answer to the original question seems to be a yes. The next step will be designing (or looking for OTS) a filter and PA.
  6. VU2TVE

    VU2TVE Ham Member QRZ Page

    @W6RZ Another noob question. Does the presence of a GPU on the computer assist in any way, or is all the heavy lifting handled by a CPU. I am planning to (later) purchase an intel NUC mini PC for this, and can pick up the CPU with adequate specifications. Some boards also come with a GPU, hence the question.
  7. W6RZ

    W6RZ Premium Subscriber QRZ Page

    It's a good question. Unfortunately, GNU Radio can't take advantage of any GPU at this time, so it doesn't matter what you specify in your NUC build.

    There have been attempts to use GPU's, but they're all super specialized for one particular purpose. Also, getting data on and off the GPU can be a real bottleneck and is a problem for generalized usage.

    There's been quite a bit of work done to use FPGA's with GNU Radio. Unfortunately, it's all been targeted at the super expensive Ettus Research high end products.
  8. WA4SIX

    WA4SIX Ham Member QRZ Page

    GPU usage is decided by software. Look at SDR-Console for some insight.
    I would definitely suggest better than an NUC.
    LimeSDR-USB would easily use the flowgraph above to do the desired output.

    @KA9LJM The OP did not ask about a Dongle, which cannot transmit.
    See what happens when you are stuck on WIN3 & a TV tuner? ;-)

  9. VU2TVE

    VU2TVE Ham Member QRZ Page

    @AA7QQ re: NUC. Really? I thought the recent NUCs were quite powerful. For example this NUC comes with a CPU with a passmark rating of 12k which is more than double that of the XEON E5-1607 that @W6RZ tested against.
  10. WA4SIX

    WA4SIX Ham Member QRZ Page

    I stand thoroughly corrected. I had no idea they had advanced so quickly.
    Of course, being cheap as I am, I probably ignored any over $200.
    Thank you, @VU2TVE

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