Posts Tagged sdr

Kenwood and Yaesu, where are you?

ICOM’s IC-7300, r8500, IC-7610 and the currently upcoming IC-9700 are making huge impacts on AROs everywhere. This is no surprise to those of us familiar with SDR technology; older analog methods simply cannot offer the kinds of performance advantages a good SDR design can.

However, one thing these radios from ICOM have in common are some poor design choices; spectrum span choices are crippled compared to a center/demodulator tuning scheme; spectrums and waterfall displays that are insufficiently adjustable; noise blankers in the least useful portion of the signal path; insufficient “knobbiness”, so that the user interface of the radio is a great deal more clumsy than it actually needs to be.

The opportunity for Kenwood and Yaesu is clear: there’s an opening here to step in and knock ICOM off the hill they climbed up on.

Imagine a stand-alone SDR transceiver where:

  • You could conveniently place the spectrum/waterfall anywhere
  • You could adjust the amplitude/level of the waterfall and spectrum separately
  • Where the noise blanker reduced the noise on the display as well as in the audio
  • Where the display was capable of high resolution output to a monitor
  • Where transmit pre-distortion provided very high quality TX
  • Important controls were given their own front panel placement
  • Full mouse/trackball integration was standard
  • Broadband IQ output was available for external use
  • Multiband EQ and compression / limiting for TX audio are provided

These are just some of the obvious places where ICOM’s radios, thus far, have fallen woefully short.

Yaesu? Kenwood? Where art thou?

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The FFT definitively explained by me, a signal processing expert

The Fourier TransformHere’s how to properly explain the fast Fourier transform, or FFT: Okay, it’s a Fourier transform, or FT, right, but while you’re doing it, you fold the buckets and the coefficients like origami, see, yes, basically like a unicorn, so you have to cut the code here, and here, and here so the head will come out right, yes, that’s it, and this code over here, it only runs if the unicorn is facing south, plus, you pull its tail so it makes little unicorn poops,uni and those have to go back into the unicorn’s little feed bin for next time around, because otherwise, the feedbin is too sweet, see, and the buckets are all funny-like and time goes back to being partially frequency. And you don’t want that.

So that’s it, yeah, and I’ll need your code example by tomorrow morning. Class dismissed.

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SdrDx 2.16a for OS X and Windows

Here we go:
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New OSX and Windows version of SdrDx: 2.13e

SdrDx 2.13e adds a very large number of changes, fixes and some features over the previous mainline release, which was 2.12q.


    Downloads: http://fyngyrz.com/?p=915
Documentation: http://fyngyrz.com/sdrdxdoc/sitemap.html
      Changes: http://fyngyrz.com/sdrdxdoc/changes.html

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New OSX and Windows version of SdrDx: 2.12q

SdrDx 2.12q adds full gain support for the AFEDRI SDR, Two additional features, control volume with SHIFT page up and SHIFT page down, and s-meter can readout pre- or post-attenuator. See the link to the changes document, below.


  Screen shot: http://www.flickr.com/photos/fyngyrz/8675326983/in/photostream/lightbox/
    Downloads: http://fyngyrz.com/?p=915
Documentation: http://fyngyrz.com/sdrdxdoc/sitemap.html
      Changes: http://fyngyrz.com/sdrdxdoc/changes212.html

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New OSX and Windows version of SdrDx – 2.12p

SdrDx 2.12p adds support for the Andrus, FunCube Pro Plus and AFEDRI SDRs; It also provides various features and fixes. See the link to the changes document, below.


  Screen shot: http://www.flickr.com/photos/fyngyrz/8675326983/in/photostream/lightbox/
    Downloads: http://fyngyrz.com/?p=915
Documentation: http://fyngyrz.com/sdrdxdoc/sitemap.html
      Changes: http://fyngyrz.com/sdrdxdoc/changes212.html

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New OSX and Windows version of SdrDx – 2.11

SdrDx 2.11 adds visible memory markers, an enhanced internal database, better panning window width by window width, a number of fixes and performance improvements, and additional documentation.


  Screen shot: http://www.flickr.com/photos/fyngyrz/8165852338/in/photostream/lightbox/
    Downloads: http://fyngyrz.com/?p=915
Documentation: http://fyngyrz.com/sdrdxdoc/sitemap.html
      Changes: http://fyngyrz.com/sdrdxdoc/changes211.html

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New OSX and Windows version of SdrDx – 2.10

SdrDx 2.10 adds support for pure audio SDRs such as the Softrock, as well as the ability to demodulate pure audio input from recordings and radios with IQ outputs.

Control of this type of SDR is implemented with an external program that catches TCP messages from SdrDx about frequency changes and forwards them to the audio SDR in whatever format it needs. A sample Python client is supplied that contains everything but the actual mechanism to talk to the specific SDR, which can be implemented as a stand-alond command line program.

2.10 also brings with it an optional new black user interface (BUI), new documentation, and RF waveform fill. The 50 MHz lower limit for the FunCUBE Dongle has been removed in order to accommodate the new FCD Plus, which extends reception into the HF region.


  Screen shot: http://www.flickr.com/photos/fyngyrz/7891402954/
    Downloads: http://fyngyrz.com/?p=915
Documentation: http://fyngyrz.com/sdrdxdoc/sitemap.html
      Changes: http://fyngyrz.com/sdrdxdoc/changes210.html

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