Radio Selection
If you are using an up-converter or down-converter then you must apply an offset to the radio. To do this go to the Radio Definitions window (where you search for and manage the list of radios) and enable the option Converter selection. Click Edit to define the list of converter offsets.
There are currently no plans to support radios from WiNRADiO® by RADIXON® , this is a commercial decision.
Please refer to the hardware / manufacturer specific pages on this website for more information.
If the software gets slow, locks up and crashes when you start the radio it is very probable that you have overloaded your computer. Try a lower sample rate (bandwidth) when starting the radio. This has been experienced with old Core2DUO systems and high sample rates from the SDRplay and AirSpy. If all else fails there has never been a better time to buy a new computer.
If the waterfall display appears to be inverted then you must enable and select the Invert Spectrum option. Open the Select Radio window, click Definitions. At the bottom of the Definitions window check Invert Spectrum. When you close the Definitions window the Invert Spectrum option is now shown in the Select Radio window.
If you are using a RTL Dongle you must install the latest DLLs, see the RTL Dongles page (under Radios).


If You have choppy or broken audio you can increase the playback buffer sizes. To do this go to the Receive pane in the ribbon bar, select Options, Playback Buffer Size and read the help text.

ELAD FDM-S2 - see the latency notes on the ELAD page.

CPU Overload - another reason for choppy audio is overloading the CPU - try running the radio at a lower bandwidth, this reduces the amount of data being processed by the computer and as a result the CPU load.

There is no need to reinstall drivers - this is not a driver-related issue, rather a 'software not quite ready for prime time' issue.

The receive features in this software are free for radio amateurs and shortwave listeners, specifically those who use the software as a hobby.
It is possible that a licence may be required to use the transmit features, this is a decision for 2017 at the earliest. In the main this depends on the support effort required and the costs associated with providing transmit support.
A licence is required to use this software commercially.
TBA ...

The software will run on a small Z3735F ATOM system such as the Quantum Byte Fanless Windows® Mini Desktop PC but only at low bandwidths (typically less than 1 MHz), anything higher can lock up the software. If you want a nice and nippy PC then the suggested minimum configuration is:

  • 64-bit Windows 7, 8, 10 (10 is recommended)
  • 4GB RAM (8GB is better)
  • 128GB SSD Disk for Windows
  • i5 4th generation or better, any CPU frequency (i3 if on a tight budget)
  • (Optional) If you are buying a graphics card then NVIDIA is recommended with compute capability 3.0 or higher, for a list of NVIDIA GPUs: https://developer.nvidia.com/cuda-gpus (more about CUDA below)

CPUs such as the Core2Duo do not have the recent extension instruction sets and will not process high bandwidths efficiently. In its day the Core2DUO was an outstanding CPU. For information about extension sets see the diagnostics page.


When you use a higher bandwidth (~5 MHz or more) with increased waterfall resolution the processing demand will increase, specifically it is the FFT [wikipedia] processing load. Graphics cards are well suited to FFT processing as they are parallel processors.

If you have a NVIDIA graphics card with compute capability 3.0 (or higher) and support for unified memory (all newer cards support this) then the FFT processing can run on the NVIDIA card, thus freeing up CPU cycles for other activities. Also a graphics card card run the FFT processing at a higher resolution than supported on an Intel / AMD CPU core, for example when running the AirSpy at 10MHz bandwidth with x4 (or higher) resolution.

In addition offloading graphics processing to a graphics card can (not necessarily will) result in a faster, more fluid response, especially when using higher resolution displays such as 4k at a 60 Hz refresh rate.

At the time of writing (late May, 2016) a good price / performance card is the GTX 950. The minimum card is the GT 730.

Bottom line: only you can decide whether to buy a NVIDIA graphics card, it is advisable when buying a new computer, but can always be added later.

Operating System

Only Windows 7 or higher is supported with Windows as the host operating system. There is no support for Windows when used with virtualisation solutions. Windows 10 is recommended, it works very well.