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Assorted ramblings from the developer

Another Airspy HF+
Another Airspy HF+

My second Airspy HF+ arrived today fresh from the production run, below are a couple of screenshots from BBC Radio Cornwall on 103.9 MHz. In the main photo you see the packaging!

Well worth waiting for, no-one will be disappointed.

CW Skimmer

The original CW Skimmer implementation missed an importrant feature, namely:

* Working properly

After a few hours' coding it's now OK.

ACOM 1200s

This is what I want for Christmas. 1kW of pure loveliness, ideal for my SDR transceivers.

More information here.

New Wesbsite - Almost Ready
New Wesbsite - Almost Ready

The new website (that's this one) is almost ready - still testing but looking good. Sadly the old skins I used on DNN8 were deemed to not be secure, the company I purchased them from did nothing about this, so I bought news skines from and a new DNN system with DNN 9 was installed on a big DoDaddy farm.

Please have a look through the pages and report any problems.

Thanks - Simon

V3 Demo

Amateur radio operators on 80m. Recorded using a NetSDR and Wellbrook loop antenna.

ML&S, RSGB Convention 2017
ML&S, RSGB Convention 2017

Good to see SDRs being demonstrated at the 2017 RSGB convention, just wish I were there. Photo from a post on the ML&S facebook page.


Keyclicks on 20m

Lots of keyclicks on 20m!

2018 ARRL Handbook

It's nice to see SDR featured on the front cover of the 2018 ARRL Handbook - maybe 2018 will be the year of the SDR?

Recent Posts

  • 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 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.
  • Pluto on Es'Hail 2 Posted last month
    Here's a screenshot of my Pluto SDR on Es'Hail 2, this screenshot shows the suggested settings for pluto(bottom left-hand side). Note the RX Gain is set to Slow Attack (Manual value is ignored) and the Visual is set to -40dB.
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