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  • DD4WH's Avatar
    11-24-2022, 02:56 PM
    Thanks for being so open and clear in your statements! I totally agree to most of them :-). However, I would like to emphasize a few things: * it was the original author of the code, who presented the project in a...
    196 replies | 12487 view(s)
  • DD4WH's Avatar
    11-24-2022, 07:32 AM
    I am a little puzzled by the mentioned problem of severe recording problems (slowing down, speeding up, large parts of audio lost etc.). I have built four of these audio guest books, with T4.0 and T4.1 and both...
    196 replies | 12487 view(s)
  • DD4WH's Avatar
    11-17-2022, 05:35 PM
    Not sure, what you would exactly try to achieve: do you have the actual measured impulse response of your amp (and transformed into minimal phase form) OR do you have the EQ response (your picture) and would like to...
    3 replies | 289 view(s)
  • DD4WH's Avatar
    11-17-2022, 05:23 PM
    Bob, that looks excellent! Especially the idea of having such a test generator is superb and provides one with the necessary tool to test the FT8 decoder! The sensitivity figure you give is fantastic, unbelievable...
    82 replies | 23488 view(s)
  • DD4WH's Avatar
    10-07-2022, 05:50 PM
    With the help of Lang Elliott and Harold Mills I was able to implement their "simple" time domain overlap-add (OLA) pitch shift algorithm. It works surprisingly well for pitch shifting bird songs downwards one,...
    1 replies | 392 view(s)
  • DD4WH's Avatar
    10-06-2022, 08:33 AM
    no, the freqs are correct. WFM --> LO is one third of the Rx freq AM, SSB etc. --> LO is 4 times the Rx freq
    11 replies | 366 view(s)
  • DD4WH's Avatar
    10-06-2022, 08:07 AM
    . . . you are mixing up the standard mode of reception (SSB, CW, AM etc.) and the non-standard way (WFM) STANDARD: The QSD uses a LO freq that is 4x the Rx freq NON-STANDARD: the QSD uses a LO freq that is one third...
    11 replies | 366 view(s)
  • DD4WH's Avatar
    10-05-2022, 08:15 AM
    Hi! Did you exchange the sampling caps and OPAmp filter caps, so that the bandwidth of the hardware quadrature sampling detector is around 200kHz ? Did you bypass the output audio transformer ? Did you set the sample...
    11 replies | 366 view(s)
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About DD4WH

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About DD4WH
Location:
Central Europe
Interests:
Software Defined Radio, Digital Signal Processing, Bat detection & bioacoustics

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Teensy 4.0 - based Audio Guestbook 11-24-2022 02:56 PM
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11-24-2022 04:30 PM
Join Date
10-25-2015