Dan M0WUT

@m0wut

RF / Antenna Engineer having a play in the world of SDR/FPGAs in my spare time. Radio Amateur (M0WUT). he/him

Cambridge, England
Liittynyt toukokuu 2015

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  1. 24 tuntia sitten

    All the important contest bits sorted for final contest of the year for Flossie with and

    Kumoa
  2. 9. jouluk.

    Some very expensive Haribo turned up today! That's my weekend sorted :D

    Kumoa
  3. 5. jouluk.

    Trying out new M4A merch for 2m contest today. Will be on as G3PYE/P from Flossie

    Kumoa
  4. 3. jouluk.

    Test script now automatically generating Excel results (prefer to Matplotlib as I can edit afterwards) and extrapolating best fit lines. Datasheet OIP3 is 28dBm. Got thrown a curveball by the gradient of the non-linear bits of the IMD3 also averaging to 3,will fix tomorrow

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    Kumoa
  5. 30. marrask.

    Testing out new IMD measurement on 20dB amp. Interestingly, the IMD seems to grow at 3x (in dB) for a while, then increases. Blue line has gradient of 3. I'm measuring power using spectrum analyser markers (i.e. only measuring power at right frequency). Will think more tomorrow🤔

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    Kumoa
  6. 28. marrask.

    Huh, seem to be on a role today. 10MHz -6GHz amp looks to be working well on JLCPCB material (7628). Gain (up to 3GHz as that's all I can measure) is 0.5dB down on datasheet with Rogers so happy with that. Will measure full frequency range at work tomorrow

    Kumoa
  7. 28. marrask.

    Spent today bringing up my IMD test fixture board and so far, I'm really impressed with the performance. Full writeup here:

    Kumoa
  8. 18. marrask.

    Got to say, I'm pretty impressed with new Siglent signal generator. Especially as this was one that was "upgraded" to 120MHz and I haven't accounted for cable loss (yes, that's lazy but it's midnight!)

    Kumoa
  9. 23. lokak.

    Past Dan wasn't latching the input data in the first bit of code it hit. This meant adding a logic analyser (inside the FPGA) changed the delay seen by different bits from the ADC to the analyser depending on what code was being run and occasionally slipping a bit :(

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    Kumoa
  10. 23. lokak.

    should read "with the input shorted (before a transformer..."

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    Kumoa
  11. 23. lokak.

    Hmm, ADC seems to be poorly now :( This is with the input (before a transformer so not properly shorted but near enough). Data is signed so should be flicking between small positive (MSBs all 0) and small negative (MSBs all 1). Bits 8 and 9 now seem to be misbehaving

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    Kumoa
  12. 22. lokak.

    Before IMD measurement boards arrive, I spent the evening writing a library for Siglent signal generators. Unit tests all seem happy (Despite Siglent obeying 75% of SCPI standard and throwing caution to the wind on the remainder including undocumented commands :'( ) so beer time!

    Kumoa
  13. 19. lokak.
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    Kumoa
  14. 19. lokak.

    And that sounds like a radio to me - about as many stations as I can hear on the K3! (Initial angle is so microphone is near speaker as haven't got AF AGC yet)

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    Kumoa
  15. 17. lokak.

    Standard WUT contesting gear all ready for 6m AFS

    Kumoa
  16. uudelleentwiittasi
    16. lokak.

    radio in the GHz bands: micrometer-precise stripline on exotic dielectric substrates, minuscule arcane glyphs etched in copper & gold radio in the MHz bands: bolt a wire to your rain gutters, twist variable capacitor/inductor knob to tune, try not to set off your smoke alarms

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    Kumoa
  17. 13. lokak.

    Tonight's board is a combiner and sampler for my new signal generator to allow IMD measurements.

    Kumoa
  18. 10. lokak.

    If anyone is not a radio ham / didn't make the convention yesterday on hand soldering techniques, my talk is available here: Promise I'll stop going on about it now ;)

    Kumoa
  19. uudelleentwiittasi
    9. lokak.

    Live streaming from the National Radio Centre with an awesome team

    Kumoa
  20. 9. lokak.

    RSGB Convention talk on intro to soldering done. Apologies for bad internet in the Q+A, feel free to ask here or email correct on if I didn't get round to answering something.

    Kumoa

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