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Assorted ramblings from the developer

LimeSDR Mini
LimeSDR Mini
The new LimeSDR Mini working with V3. Early days still, screenshot shows lots of interference from PC and UPS.

RadFxSat Fox 1B
RadFxSat Fox 1B

Picking up RadFxSat Fox 1B on her first pass over Cornwall, FM on 145.960 adjusted for Doppler. The initial TLE data is pretty accurate. Receiver is the Airspy HF+, antenna general log periodic for 130 MHz to 1.3 GHz.


Click here for an audio recording (MP3)

Station Info

V3 Analyser
V3 Analyser

Here's a screenshot of the version 3 Analyser slowly taking shape. This is a zoomed processing on 963kHz taken from an overnight recording, we see many medium wave (MW) carriers present.

Data processing at 1,343 megabytes / second from a NVMe SSD card.

More later...


Listening to pirates on FLTSAT-8 with the HF+. Found the FLTSAT 8 TLE data on the internet, added it and let the software point the log periodic at the satellite. First time I've ever listened to the pirates - not very entertaining if truth be told.

In The Shack

Here are pictures of the offcie / playroom / shack.



Airspy HF+ & NOAA 18
Airspy HF+ & NOAA 18

Overhead Pass

Here's an example of the HF+ receiving the NOAA 18 APT weather satellite, the antenna is a log periodic covering 130 MHz to 1.3 GHz. The HF+ is very sensitive and very quiet - no mixer products, spurs, or artifacts at all.



Low Angle Pass

Here's an image from NOAA 18 but a moch lower angle - 13 degrees. You see noise on the image, but nethertheless an excellent copy.

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.

Recent Posts

  • V3 Beta Posted last month
    After three years the first beta is available, download from
  • V3 Server Posted 3 months ago
    Still early days - testing the connection between Cornwall and North Carolina. Streaming IQ data, working well. Enjoying the AM transmissions on 80m.
  • ISS Images, Dec 7th - 8th 2017 Posted 3 months ago
    In total nine of the twelve were copied during the afternoon passes on December 7th and 8th 2017.          
  • ISS Images, Dec 6 2017, 15:03 UTC Posted 3 months ago
    Excellent images copied from the ISS. radio is the Airspy HF+, 12 element X Yagi, satellite tracking etc. from SDR Console.      
  • LimeSDR Transmitting Posted 3 months ago
    I spent a day working on transmit support for the LimeSDR. This is by no means finished, but I'm able to say that it works. I have a few problems, Big spur at 0Hz, probably generated by a bad software mixer, Noise bursts when switching from receive to transmit.  The above are down to my own software, so I'll give myself a good kicking sometime and get this fixed later in 2017 or early 2018. Here we see the Upper Sideband (USB) signal as received with an Airspy HF+. And here's the TX panel from SDR Console.
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