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  • 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...
    114 replies | 38426 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 | 17837 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 | 17837 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 | 1986 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: ...
    114 replies | 38426 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 %) ...
    48 replies | 770 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: ...
    48 replies | 770 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 | 17837 view(s)
  • DD4WH's Avatar
    12-13-2018, 07:53 AM
    Hi Mike you can contact pa0rwe whether he still has his excellent PCBs available. or try the kit by QRP labs „Receiver module“, which has excellent Performance for its price. we have very good experience with...
    114 replies | 38426 view(s)
  • DD4WH's Avatar
    12-05-2018, 06:06 PM
    DD4WH replied to a thread Bat detector in Audio Projects
    seems I had an "old" version of the uSDFS lib (February 2018), now I updated the lib (March 2018) and recording works! But how can I adjust the sample rate for my playback? It seems it is always 8ksps, so recordings...
    193 replies | 17837 view(s)
  • DD4WH's Avatar
    12-05-2018, 05:26 PM
    DD4WH replied to a thread Bat detector in Audio Projects
    Compiled the code again and uploaded it to the Teensy. Now the spectrum works and the switching between display modes works as expected! Nice. Recording does not work: Tried more than 20 times with four different...
    193 replies | 17837 view(s)
  • DD4WH's Avatar
    12-05-2018, 08:42 AM
    DD4WH replied to a thread Bat detector in Audio Projects
    Hi Edwin, thanks a lot for all your help and the video, that explains a lot to me and answers a lot of questions! Some things react differently in my setup: * when I switch to the spectrum, it shows one static...
    193 replies | 17837 view(s)
  • DD4WH's Avatar
    12-04-2018, 09:41 PM
    DD4WH replied to a thread Bat detector in Audio Projects
    Hi Edwin, hi CorBee, thanks again for your efforts to improve the software and providing a nice PCB! I managed to build the detector, but I have problems with using it :-). I probably need a user manual ;-). I...
    193 replies | 17837 view(s)
  • DD4WH's Avatar
    11-29-2018, 07:07 AM
    hi Frank, looks great!!! Canīt wait to test that! All the best, Frank DD4WH
    39 replies | 1986 view(s)
  • DD4WH's Avatar
    11-27-2018, 05:14 PM
    As far as I remember we already had that topic on the forum ;-): https://forum.pjrc.com/threads/50506-Working-on-a-BPM-detector-am-I-stepping-on-anyone-s-toes?highlight=bpm+detection ...
    18 replies | 641 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) 01-18-2019 03:55 PM
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Last Activity
01-18-2019 03:59 PM
Join Date
10-25-2015