A Micro Multibander – Step by step (Part I)

This project has been cancelled but finally succeeded in another multiband transceiver:


(Start entry for a series of articles covering this respective radio)

The "Midi6" - An experimental HF radio for 6 amateur bands and SSB modulation. By DK7IH (Peter)
The “Midi6” – An experimental HF radio for 6 amateur bands and SSB modulation. By DK7IH (Peter)

5 Replies to “A Micro Multibander – Step by step (Part I)”

  1. Hi Peter,
    Sounds like a great project, look very much forward to seeing the whole project.
    Keep up the great work you do
    John ZL2TCA

  2. Always loved your work Peter. Thank you !
    Will keep tracking this project.

  3. gOOd morning Peter,

    I am always glad that your blog is informing me about any news automatically. As I mentioned before it was your „QRP Baubuch“ which brought me to the path of homebrewing and qrp.
    I am looking forward to read about your new „Take 5“ project.

    As the lyrics of the original song “Take five“ are pointing it out ……. :

    “Start a little conversation now, it’s alright, just take five, just take five…“

    bon chance es 72 de sTef – DM5TU / VY1QRP

  4. Hi again Peter, your si5351 oscillator/controller looks FB. Some si5351 designers use CLK 0 and 2 for the two oscillators rather than adjacent clocks, on the basis that there is more electronic and physical separation. I suspect this may be folklore, I haven’t seen any actual measurement, but I suggest it as ‘common and/or good practice’. Look forward to future episodes in your serial. 73 VK3HN.

    • Hi Paul, I agree. I think the Si5351 as an oscillator or a combination of VFO and LO has got other problems than signal separation. I have observed that in a VFO/LO combination there is some noise on the unused channel (in the range of some mV) but no detectable RF signal of the channel in use.

      And without knowing about the interior structures of the chip it is just guessing that using CLK0 and 2 might have any benefit. But what I found is that if you don’t set an unused channel deliberately to 0Hz and switch it off this way, this noise can be reduced to a certain degree. But that was just an observation which I haven’t quantified.

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