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Presentation, or parts, on the math of the radio server and SSDR

Stan VA7NF
Stan VA7NF Member ✭✭✭
edited November 2017 in FLEX-6000 Signature Series
I am putting together a presentation for our club on "How a SDR actually works".

Thank you Howard for your excellent presentation on the progression of radio technology - Already used portions with credits.
 
Next step - Details "for Dummies" on the process including such things as:
 - What is an AtoD converter - Sampling rate, Nyquest frequency, output data 
 - DFT/FFT conversion of data array(s) into buckets and IQ data
 - Slice Receiver operation - 'Tuning' by ... (FFT bucket analysis?)
 - The math (very simplified) of demodulation

I am sure many here would appreciate the high level concepts - but definitely without FRS proprietary information.

Stan - VA7NF
Gopher, president, and technical consultant for Surrey Amateur Radio Club

Answers

  • KY6LA_Howard
    KY6LA_Howard Member ✭✭✭
    edited February 2017
    Send me an email to callsign AT callsign dot com and I will send you links to several other canned SDR presentations that I have made.
  • Jim Jerzycke
    Jim Jerzycke Member ✭✭
    edited November 2017
    I'll be very interested in reading this if you post it somewhere, Stan.

    I've done something similar for my local club, but had to fall back on the "Here Be Dragons" approach for some of it, as while I understand the concept, some of it's pretty hard to explain in layman's terms to those who aren't well versed in digital things.

    73, Jim  KQ6EA
  • Tim - W4TME
    Tim - W4TME Administrator, FlexRadio Employee admin
    edited February 2017
    For DSP, it is "Here be Magic". ;-)
  • Jim Jerzycke
    Jim Jerzycke Member ✭✭
    edited February 2017
    :-)

    You don't know some of our club members! If I would have gone into it, and got one scintilla of it wrong, I'd be up to my you-know-what in alligators.

    Hence the "dragons" reference.

    But I agree...to most people, it really is magic. The magic part is a bit hard to get across when you have 99% of the club that doesn't even understand the fundamentals of such things as A-to-D conversion, and the fact that a PC soundcard is a digitizing device that helped kick off the whole SDR revolution.
  • Ross - K9COX
    Ross - K9COX Member ✭✭
    edited June 2017
    “The wireless telegraph is not difficult to understand. The ordinary telegraph is like a very long cat. You pull the tail in New York, and it meows in Los Angeles. The wireless is exactly the same, only without the cat.”
  • KY6LA_Howard
    KY6LA_Howard Member ✭✭✭
    edited March 2017

    Here are links to several different presentations I have given

    Some are Definitely OUT OF DATE in that the state of the art has moved on.


    I am working on a couple of new presentations with updated material as we speak

    Four Generations of SDR.V3.0.pptx         http://bit.ly/2kQkJZ3

    History of Radio V5.0 PPTX                           http://bit.ly/2k0fyXC

    How to Build a Quiet Station                       http://bit.ly/2kKCNEh

    Idiot Beginners Guide to Flex Radios       http://bit.ly/2kpbM8u

    SDR 101 V2 PPTX                                              http://bit.ly/2kKyVTO

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