uSDR Files

	uSDR is a general purpose multimode software defined radio receiver Windows application. "u" means micro because of lightweight binaries distributive, simple and compact user interface, highly optimized DSP routines to minimize CPU usage. Compatible with RTL-SDR, AirSpy, BladeRF, HackRF, LimeSDR, SDRPlay, RTL-TCP frontends. Able to perform input IQ streaming, base band and pass band recording, play back, demodulation, spectrum and waterfall visualization, animated spectrum navigation, fast zoom and pan. The most of parameters (input frontend, audio device, sample rates ect.) may be changed on the fly, no application hang-up, non need to restart. Under development and a lot of features coming soon.
Features
* really lightweight binaries distributive
* no need any frameworks, service packs, runtime libraries
* high optimized DSP routines with FPU and SSE
* simple and intuitive user interface
* animated spectrum navigation, fast zoom and pan
* maximized spectrum workspace, auto hide toolbars
* suitable for small (VGA) up to huge (2x4k) screen resolutions
* basic SDR options: input IQ streaming, band recording, demodulation, spectrum and waterfall visualization
* change parameters (I/O devices, sample rates ect.) on the fly, no application hang-up
* keeps input IQ stream history
* frequency manager
* Windows XP and slow CPUs compatible
* multithread processing for huge sample rates

v 1.3.0 (first release, basic options)
* RTL-SDR, AirSpy, BladeRF, HackRF, LimeSDR frontends support
* frontends enumeration on the fly, drop down menu with all available and connected devices
* continuous baseband, pass band and audio recording, variable FIFO buffer siz
* IQ stream history accumulation option, no loss of missed signals
* bump IQ stream history option, slow HDD is not a problem
* IQ play back
* turn on/off FFT individually spectrum calculation, pass band processing, demodulation, audio play back
* can operate as wideband spectrum analyzer with no processing, baseband recorder with no visualization, ect.
* interactive spectrum control (panning, zooming, pass band adjustments by mouse and wheel)
* can visualize one part of baseband spectrum while processing and demodulating other one
* adjustable display, spectrum and waterfall (position, magnitude range, spectrum to waterfall ratio)
* adjustable spectrum FFT calculation rate and waterfall slow down
* adjustable pass band processor, spectrum threshold detection
* pass band position is attached to radio frequency and operates correctly when panning and zooming the spectrum
* basic audio demodulators (AM, FM, LSB, USB, DSB) and play back, can change audio output on the fly.


v 1.4.0
* customizable tool panel behavior (fixed, floating, undocked)
* SDRPlay frontend support (API v.2.13)
* RTL-TCP streaming interface support, presets quick switch (server, port, description)
* high precision Wav IQ file play back
* support RIFF 8, 16, 24 and 32 bits integer, 32 bits float, FR64 file formats for play back
* recognize Wav IQ file central frequency for play back
* frequency offset (shift) for x-verters
* swap IQ (invert spectrum) option
* improved FFT spectrum calculation and visualization
* waterfall color map range may be changed manually on the spectrum window as well as on tool panel, also included the auto scale option
* color map palette can be customized and fast switched, palette presets are included
* FIFO buffer size (IQ history time) may be changed on the fly, all memory allocations are under hood, no loses of previously stored history 
* pass band may be attachment to global frequency as well as to local baseband frequency or to screen position
* squelched threshold control and level indicator for demodulation (in addition to adjustable spectrum threshold detector)
* stereo FM demodulator
* low latency audio
* frequency manager, groups and interactive markers, visualize, edit, navigate, tune the pass band
* spectrum and waterfall popup menus
* improved GUI controls
* "fine tune" option: set pass band to rounded frequency (spectrum right click)
* statistics visualization window

v 1.5.0
* lock device frequency on zoom option
* keep waterfall history – the very great option, do not lose any rare signals
* advanced passband IQ recorder
* passband IQ TCP server for remote processing, C/C++ client source examples included
* advanced audio player, auto selectable sample rate, separate left/right channels
* CTCSS decoder
* markers import option convenient for merge markers 
* Ctrl+Shift+Drag Up/Down – change spectrum magnitude offset
* Ctrl+Shift+Mouse Wheel – change spectrum magnitude range (vertical zoom)
* Ctrl+Mouse Hover – highlight nearest marker
* Ctrl+Double Click– tune to highlighted nearest marker
* band plan visualization, simple text format
* frontend interface improvements
* GUI improvements
* spectrum and waterfall popup menus improvements
* a lot of bug fixes


v 1.6.0
* Airspy HF+ Discovery frontend support
* ExtIO*.dll interface support
* LimeSDR multiple frontends switch fixed
* FM demodulator with inverted audio spectrum
* DCS decoder
* additional C/C++ source examples for IQ TCP passband proicessing client
* advanced IQ file playback options
* dispaly hold peak spectrum mode, zoomable and panable plot, customized colors

v 1.7.0
* Fobos SDR frontend support, the very new SDR from RigExpert
* bladeRF API v2.5.0 support, oversampling mode up to 122.88 MHz sample rate (do not forget to update FX3 firmware)
* advanced IQ playback mode, precise timing and streaming
* improved DSP routines and memory management, minimized CPU load 
* excellent ruller tool for spectrum frequency and amplitude measurements

v 1.7.1
* Fobos SDR API v.2.3.0  support
* Scatter plot for raw IQ data
* Improved IQ TCP streaming server

v 1.8.0
* Fobos SDR API v.2.3.2 support
* Fobos SDR (agile) API v.3.0.1 support
* More improved DSP routines and memory management, minimized CPU load 
* Current sample rate indication