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Assorted ramblings from the developer


Lime's Digital Filter

So, revisiting the Lime support and have implemented the digital low-pass filter (LPF) built into the chip. In the screenshot below the sample rate is 40 MS/s (40 MHz bandwidth) with the digital filter set to 55% (22MHz). You now see this filter in action.


Release: 3.0.5

Download here [Link].

Note: 3.0.5 fixes / enhances the support for PlutoSDR.

What's new / changed in 3.0.5:

General

  • Transmit support enabled for frequencies above 4GHz.
  • Receive support error fixed, now works above 4.2GHz.
  • Transmit NFM now has configurable deviation and maximum frequency:
  • Added Synchronous AM demodulation DC correction.
  • If a radio was Stopped / Started with Tone enabled then subsequent transmission was unreliable – either no output or very low output. This problem resolved by resetting the Tone and Tune options in the transmit window when stopping a radio.
  • Cosmetic: program size now optionally shown in status bar (bottom right), this option is enabled in Program Options (bottom right):
  • Cosmetic: receive DSP Mode selection window […] improved:
  • Cosmetic: Select Identity window optionally shown when program starts now has the title correctly updated:

Pluto

  • More sanity checks when connecting to a device.
  • Pluto can now be accessed using the IP address, the default is ip:192.168.2.1 URI (format), the Pluto IP address can be changed as required.
  • Recoded the Pluto transmit thread – now more reliable.
  • Transmit data is correctly buffered so there are fewer glitches when sending data.
  • Added bandwidths which use the AD9363's decimation/interpolation. These bandwidths are 500 kHz ... 1.5 MHz.
  • Added extra pane to Receive DSP (below), temperature is recorded for RX and TX:

    You can export the data to CSV file, in Excel you can then create a chart like this:

Frequency Database

  • Fixed frequency database Language field, an incorrect 0 was shown at the start of the language name.
  • Added support for new AOKI frequency database layout.

Satellites

  • Current satellite name is shown in main window title.
  • Tracks are now optionally displayed for entries in the Satellites List (top of ribbon bar).

Satellite Footprints

As part of the fixes / enhancements for 3.0.5 I've added the optional display of footprint for additional satellites, lots of display options now available.

Coming soon!


Recent Posts

  • Release: 3.0.14 Posted 1 days ago
    Download here [Link]. What's new / changed in 3.0.14: General Closing threads (and the program) now much faster if the thread had not been started, also System Debugger diagnostics have been enabled to find any other issues when closing the program if the ‘Not Responding’ text was seen in the title bar. Fixed bug where a high-pass filter could be incorrectly applied to broadcast FM demodulation. RDS logfile now supports UTC as set in the … Options window. Geostationary beacon window now applies the current contrast when floating. Receive audio equaliser now correctly initialised when started from either: Audio dropdown, Ribbon bar. FM Squelch: big change on the FM squelch front: Now suing power suqelch instead of noise squelch, the squelch threshold/level values will be different, sorry about that. The original code was over nine years old and was a cheap and cheerful solution. In the kit the whole concept has changed, now it’s an advanced squelch based on signal power. Synchronous AM, ECSS Lock Range: ribbon bar entrry added. ...
  • Transparent S Meter Posted 2 weeks ago
    Version 3.0.13 introduced analog S meters and resulted in requests for transparency. One of the big features of SDR Console is the use of Direct2D graphics which is a lot more complicated than the GDI/GDI+ used in many other ham radio programs such as Ham Radio Deluxe. Working out transparency wasn't easy, finally a Microsoft example showed me how to do this. A day when you don't learn something is a day wasted. Here's an example of transparency. This will be part of 3.0.14.
  • Release: 3.0.13 Posted 3 weeks ago
    Download here [Link]. What's new / changed in 3.0.13: General Fixed frequency display problem in the RDS display. 100.05 was displayed as 100.5. Minor change to logic when closing the Matrix window, linked to a memory leak. Reduced background thread start-up time. Added Equaliser… option to the Playback device selection.   The Radio Selection windows displays Connect when a V3 Server is selected, otherwise Start. New option to replace 0 with O in the main frequency display.   Added Google Turbo and Inferno colour schemes.   Markers Memory definitions can now be shown as markers: new option in Markers dropdown and on the memories pane of the ribbon bar. Display of markers more efficient. Enhanced the marker display logic, allowed more room when markers overlap. Recordings Audio recordings made while playing an IQ recording are now timestamped with the time from the playback, not the current time. Added Status option to Playback pane in the ribbon bar. When selected the playback status is shown in the waterfall (the default). If not selected then playback status is not ...
  • Google Turbo Posted 3 weeks ago
    Turbo, An Improved Rainbow Colormap for Visualization  https://ai.googleblog.com/2019/08/turbo-improved-rainbow-colormap-for.html On Tuesday, August 20, 2019 Google posted an interesting colour scheme which they named 'Turbo'. Read more about this in the blog entry (link is above). Below is the colour map in action on the 25m shortwave broadcast band. As of 3.0.13 this is a standard colourmap[ in SDR Console. Also of interest is the use of a SNR (Signam to Noise) S Meter option.
  • S-Meters Posted 3 weeks ago
    After much pestering by users, I finally added an Analog S-meter to SDR Console. These will be available in 3.0.13, coming to a desktop near you soon. Background A few weeks previously a reasonable logic was implemented for measuring the noise floor. Purists will not be happy, but they rarely are, but it works for me. Take the output from the SDR radio, ignore 15% of the bandwidth at the high and low end of the output to avoid the ant-alias filtering, and we're left with a healthy 70% of the signal. Now sort the FFT bins by value, take the mean of the lowest 10% and that's the noise floor. Digital Starting with the standard digital metere: Analog Here are a few screenshots of the Analog S Meter. First a tradition meter in S units. Red = peak signal Yellow = current signal Grey = noise floor   Here's a dBm meter, same colours as above.   And here.s a Signal to Noise (SNR) meter.
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