Monthly Archives: June 2019

Winradio’s SIGMA: “… the Killer speaking!”

Winradio’s Sigma is here covering the whole HF range from 0 to 32 MHz (top left, spectrogram), with brodcaster CRI on 15’410 kHz demodulated (top right, spectrum) and the complete range of 0 to 88 MHz (bottom, spectrum).

When I saw the late Chuck Berry in concert with Jerry Lee Lewis, the latter was announced as: “… the killer speaking!” Having switched on Winradio’s WR-G65DDCe, or ‘Excalibur Sigma’, the also breathtaking show of this receiver reminds me to that concert: The Sigma is also kind of a killer to all other software-defined radio (SDRs) for which it now defines the benchmark in nearly all aspects.

It comes as the top model of a highly respected line of SDRs from Winradio in Australia, which pioneered the market of high performance receivers defining the state of the art. For hobbyists, the Winradios often define the utmost price tag they want to pay. Whereas professionals, in opposite, are happy to get an excellent peformance at modest costs. Yes, buying the Sigma will set you back nearly 7’000 Euros, but: “Madame, there is no second.”

What makes the Sigma unique? First, it is its covering up to 64 MHz with 16 bit resolution flawlessly over an USB3.0 connection, resulting in a spurious-free dynamic range of 111 dB (2 dB lighter with pre-amplifier). You may record this full range even onto external hard disk without loosing a bit. Then you may play back and tune it as live from the hard disk, offline and flawlessly. The whole HF range from 0 to 32 MHz needs about 155 MB/s with even some headroom when doubling the range to even 64 MHz. Winradio says, the Sigma will run from a quad core, and they are right: I have it running from a laptop Dell Inspiro 5770 with i7 8550U @1.8 GH, 4 cores, 16 GB RAM, 2TB hard disk. CPU usage during recording a 32 MHz wide range was never over around 12%.

From start, Winradio has built up a solid reputation to combine professional hardware delivering top performance with intuitive software, resulting in a nearly unsurpassed user experience. As you can rely on the published data, I want to concentrate on Sigma’s practice. This will be a work in progress as it should include some time-consuming recordings and comparisons.

P.S. UK’s „Radiouser“ and Germany‘s „Funkamateur“ will publish an in-depth article on the Sigma in their September issues. Stay tuned.