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  • DD4WH's Avatar
    02-16-2019, 08:58 AM
    Sorry, I made a mistake: the Carson formula for the approximate bandwidth of an FM-modulated signal is the following: Bandwidth = 2 * (frequency deviation + baseband bandwidth of the audio signal) For an FM radio...
    135 replies | 40486 view(s)
  • DD4WH's Avatar
    02-15-2019, 08:18 PM
    Hi Wolfgang, for wideband FM reception, the SDR is in 3x undersampling mode, so your math is approximately right, if you divide the real receive frequency by 3 :-) However, in all demodulation modes -except for...
    135 replies | 40486 view(s)
  • DD4WH's Avatar
    02-09-2019, 01:30 PM
    I added some info on how to use the menu buttons, encoders and encoder push buttons in the Teensy Convolution SDR here: https://github.com/DD4WH/Teensy-ConvolutionSDR/wiki/Menu Have fun! Frank
    135 replies | 40486 view(s)
  • DD4WH's Avatar
    02-08-2019, 01:51 PM
    updated links in the Ressources - WIKI (some were old and did not work)
    135 replies | 40486 view(s)
  • DD4WH's Avatar
    02-08-2019, 10:40 AM
    I uploaded a new version of the Teensy Convolution SDR code into the github: * EEPROM_LOAD message copied into header of the file * no more hanging when there is no SD card inserted * added many nice optimizations...
    135 replies | 40486 view(s)
  • DD4WH's Avatar
    02-08-2019, 09:47 AM
    From my experience, if you want to look behind the theory in the Teensy Convolution SDR, I would recommend reading three sources at the beginning (Wolfgang: you probably already know most of these): ...
    135 replies | 40486 view(s)
  • DD4WH's Avatar
    02-08-2019, 09:37 AM
    Hi guys! @FrankB: thanks for chiming in!!! Followed your advances on T4, very very impressive !!! @DH1AKF: sorry, Wolfgang for the insufficient documentation of the project! It is not in my intention to have you...
    135 replies | 40486 view(s)
  • DD4WH's Avatar
    01-29-2019, 07:54 AM
    please follow all the instructions very precisely. You have to take care to get the installation of the new CMSIS lib right. But the instructions are quite clear here, I think. ...
    135 replies | 40486 view(s)
  • DD4WH's Avatar
    01-18-2019, 03:55 PM
    Hi Wolfgang, thank you for your interest! Yes, you can expect 50-60dB of image rejection with the Teensy Convolution SDR, the automatic software I & Q phase & amplitude correction algorithm in realtime also...
    135 replies | 40486 view(s)
  • DD4WH's Avatar
    01-18-2019, 07:33 AM
    DD4WH replied to a thread Bat detector in Audio Projects
    @CandelaRDZ: So I suspect you are using the spectrum view of the detector, NOT the spectrogram view, is that right? You can calculate your frequency resolution by dividing the sample rate by the number of points...
    193 replies | 19092 view(s)
  • DD4WH's Avatar
    01-17-2019, 04:32 PM
    DD4WH replied to a thread Bat detector in Audio Projects
    what are you talking about? write at least 2 or 3 sentences to explain what your problem is
    193 replies | 19092 view(s)
  • DD4WH's Avatar
    01-17-2019, 08:51 AM
    Hi Tim, your PCB looks great! the software and hardware is in a preliminary stage at this moment. We (FrankB and Frank DD4WH) are busy with other projects at the moment (T4 and ultrasound recording), so this...
    39 replies | 2203 view(s)
  • DD4WH's Avatar
    01-17-2019, 08:47 AM
    Hi Kevin, nice to hear that you are working on your Teensy Convolution SDR! No, unfortunately, we have not yet produced a PCB design for such a motherboard. But you may consider Bob Larkinsī very nice approach: ...
    135 replies | 40486 view(s)
  • DD4WH's Avatar
    01-08-2019, 12:55 PM
    if I did the math right, those figures actually sound to me like a maximum of 16-18 bits . . . for a 1000$ sound card Firefox UCX Dynamik AD: 110 dB RMS unbewertet, 113 dB(A) THD AD: < -100 dB (< 0,001 %) ...
    49 replies | 1144 view(s)
  • DD4WH's Avatar
    01-07-2019, 03:04 PM
    Hi Van, I have the same questions here as Paul raised. Why use a cheap Teensy if you have all your thousands of dollars 24bit equipment at hand? And you have to distinguish between sampling and processing: ...
    49 replies | 1144 view(s)
  • DD4WH's Avatar
    01-06-2019, 04:23 PM
    DD4WH replied to a thread Bat detector in Audio Projects
    @edwin: thanks you very very much for the brilliant description of the bat detector hardware and setup! Very nice for everyone who wants to build it! @Jake: thanks a lot for your DSP suggestions! I see Edwin has...
    193 replies | 19092 view(s)
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About DD4WH

Basic Information

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

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Last Post
Teensy Convolution SDR (Software Defined Radio) 02-16-2019 08:58 AM
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Last Activity
02-16-2019 09:45 AM
Join Date
10-25-2015