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Assorted ramblings from the developer


FM Band II E's & Tropo
FM Band II E's & Tropo

The band is filled with lots of French, Spanish and Moroccan stations, a mix of Tropo and Sporadic-E. Using Airspy R2 and 8-element yagi from Innov Antennas.


Direct Frequency Input

You now enter a new receive frequency by simply entering 0 ... 9 or . (period). As soon as you start typing the Frequency window is displayed.

  • C toggles the Centre option,
  • K toggles between kilohertz and megahertz.
  • For more options click the ellipses.


Signal History Export

The signal history is selected from the View, Spectrum pane in the ribbon bar, the data is exported by selecting the ellipses button.

In the Export window you now select:

  • Field delimiter and correcsponding file format of comma (CSV) or tab (TSV),
  • Decimal separator of . or the separator for your locale, for example a ,.


LimeSDR Transmitting
LimeSDR Transmitting

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.


Pirates!
Pirates!

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.


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.


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

  • FM Band II E's & Tropo Posted 3 weeks ago
    The band is filled with lots of French, Spanish and Moroccan stations, a mix of Tropo and Sporadic-E. Using Airspy R2 and 8-element yagi from Innov Antennas.
  • Direct Frequency Input Posted 2 months ago
    You now enter a new receive frequency by simply entering 0 ... 9 or . (period). As soon as you start typing the Frequency window is displayed. C toggles the Centre option, K toggles between kilohertz and megahertz. For more options click the ellipses.
  • Signal History Export Posted 2 months ago
    The signal history is selected from the View, Spectrum pane in the ribbon bar, the data is exported by selecting the ellipses button. In the Export window you now select: Field delimiter and correcsponding file format of comma (CSV) or tab (TSV), Decimal separator of . or the separator for your locale, for example a ,.
  • Broadcast FM Posted 2 months ago
    At the request of Broadcast FM users, I've added the most common options to the ribbon bar. The image below shows what's now. Stereo - enables stereo, when signals are weak mono can be preferable, Partial - enable display of text even when only partially decoded, should be used in very weak signal situations, PI Code - show the Program Information code, Show - show the RDS text in an overlay on the waterfall.
  • 1 kW SDR Posted 2 months ago
    Next week a beta Gemini 1K will arrive at the G4ELI location. With just 10W from an ANAN 10E it'll generate 1 kilowatt without breaking into a sweat. http://www.linamp.co.uk/gemini_HF.html
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