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1. Real-time Audio Spectrum Analyzer Software Online
2. Real-time Audio Spectrum Analyzer Software Programs

DL4YHF's Amateur Radio Software: Audio Spectrum Analyzer ('Spectrum Lab') Last updated: October 2020. Current stable version : Spectrum Lab V2.95 b3 (2020-10-04) Most recent 'beta' : Spectrum Lab V2.95 b? (2020-..-..)

Main Site: www.qsl.net/dl4yhf/spectra1.html Download/Backups: dl4yhf.ssl7.com/spectra1.html (gone for good?), dl4yhf.darc.de/spectra1.html ('backup'). ('freenet' site deleted since their hosting service isn't free anymore)

Spectrum Analyzer with Waterfall Display and real-time audio processing

This program started as a simple FFT program running under DOS a long timeago, but it is now a specialized audio analyzer, filter, frequency converter,hum filter, data logger etc (see history). You can download it from this site. Or look into the manual (in HTML format), even though the manual included in the archive will be more up-to-date. Furthermore, the same manual has occasionallybeen converted into a single PDF (SpecLab_Manual.pdf), but any attemptto create a common index and table of contents for this PDF, using OpenOffice (with proper page numbers instead of the hyperlinks)has failed miserably - see note in the preface of the PDF document.
If you are looking for a short description in German language, look here. The revision history is here. How to use SpecLab with SDR-IQ is described here;how to use SpecLab with PERSEUS (without an annoying virtual audio cable)is here,and how to use SpecLab with software-defined radios supporting ExtIO (instead of a soundcard),like FiFi-SDR, RTL-SDR, FunCube, SDRplay RSP, etc etc, is described here.
If you need help getting the program running, or have questions about aparticular function, look into theSpectrum Lab User'sforum at groups.io (not at Yahoo anymore)..

(SpecLab screenshot in 'Colour Direction Finder' mode, VLF spectrum,colour~bearing)

Spectrum Lab runs under Windows 98, 2000, ME, XP (home and professional),Linux/WINE, but obviously not under Windows Vista. The reason why it doesn'twork under 'Vista' is unknown. Since I don't use Vista myself, there's littleI can do about this. Use Linux/WINE, or a virtual PC running XP (inside yourshiny power-hogging Vista machine).

Spectrum Analyzer Real-time FFT - Eight-channel Audio Spectrum Analyzer is a set of Real-Time Multi-Channel Gauges for investigation of data accepted from any ADC you will want or 16-, 24- and 32-bit ADC of sound card. Audio Tools and Electronics Software. These are programs for testing and analyzing. Included are spectrum analyzers, oscilloscopes, and signal generators. These are all free versions. WD6CNF hosts a series of useful software, linked individually below. Audio Spectrum Analyzer Analyzes audio from 10 Hz to 20 kHz, Input from microphone or wave. Download VisualAudio Real Time Audio Spectrum Analyzer for iOS to visualAudio is an acoustic analysis tool for science and engineering applications where quantitative frequency and level data are.

Features

• Input can be taken from the soundcard, but the 'audio utility' interface makes it possible to create an interface to any A/D converter you like (for example a PIC with serial interface). A plugin for Winamp allows to analyse audio streams from the internet (see download section).
  Besides the soundcard and the interfaces supported by the 'audio utilities', SpecLab directly supports SDR-IQ and SDR-14 (by RFSpace, Inc), and PERSEUS (by Microtelecom s.r.l.).
• Demodulated output is usually sent to the soundcard, but can be sent anywhere else (including an MP3- or OggVorbis encoded stream using Winamp/Oddcast and a special Audio-I/O DLL, which acts as an input plugin for Winamp).
• Selectable and adjustable waterfall color palette allows you to change the contrast of the waterfall display during and after receiving spectrum lines ('contrast' & 'brightness' - sliders)
• Frequency range can be adjusted while running, the old part of the waterfall display will automatically be re-drawn without stopping the audio processing.
• Special waterfall mode for 'Radio Direction Finder' with colour-coded azimuth display, based on DF6NM's Wideband Direction Finder with Colour Encoded Spectrogram Display. Now with up to three 'notches' (adjustable nulls in the synthesized antenna pattern) to suppress noise from certain directions.
• Special 'multi-strip' waterfall mode for long term observation of relatively narrow bands
• Reassigned spectrogram for higher time- and frequency resolution, if certain conditions are fulfilled (since 2009-06)
• Support for image-cancelling direct conversion receivers ( quadrature input via stereo soundcard )
• Very sharp, FFT-based audio filters which can also be used to shift and invert frequencies, with auto notch, denoiser, etc. New (2007-02): Write your own plugin for the FFT filter !
• Waterfall display may run from top to bottom, or from right to left (good for HELL modes)
• Calculation of peak levels, peak frequencies, noise levels, effective values, SINAD, etc
• File logging and file analysis with WAVE files ( now with 'Triggered Audio Recorder' + pre-trigger option )
• Periodic or scheduled actions, for example to capture the screen as BMP or JPEG file
• Audio sample rates from 8000 to 192000 samples per second.
  192 kS/second only tested with a few cards, using ASIO drivers and / or standard multimedia driver. With extra hardware (like software-defined receivers with high-speed USB interfaces), even higher sampling rates (and thus bandwidths) are possible.
• 16-bit ADC resolution giving about 90dB of input range (plus additional FFT gain!)
• 24-bit resolution possible with certain cards (tested with Audigy 2 ZS; 2004-05)
• Frequency resolution in the sub-milliHertz range (exceeding the stability of the soundcard's clock generator).
• FFT output is buffered in an array with adjustable size for long-term observations (with 'scroll-back-in-time' while analysis continues). Furthermore, the FFT output can be recorded (exported) in various formats.
• Signal generators with selectable waveform, frequency, and optional modulation, plus noise generator
• Hum filter to remove 50 Hz (or 60 Hz) plus harmonics, based on Paul Nicholson's algorithm for a multi-stage comb filter with automatic tracking. If you are interested in improving your Natural Radio reception, read Paul's Notes on Domestic VLF Reception.
• Frequency converter to shift low 'IF'-frequencies (e.g. 17.2 kHz) to audible tones (650 Hz, etc) in real-time. Can be used in a 'soft-VLF-RX'. Other demodulators in DSP-blackbox.
• Decoder for some time-code transmitters: MSF(60kHz), HBG(75kHz), DCF77 (77.5kHz) can now be used to set your PC clock to a high accuracy. All you need is your longwave receiver and the soundcard.
• Modulator and decoder for some 'experimental' digital communication modes like PSK31, BPSK, QPSK, FSK, multi-tone HELL, MSK (minimum shift keying since 2004-12), transmission and reception of letters with a small 'terminal' window.
  A DLL interface is available to use Spectrum Lab for new digital transmission modes (but not in use yet).
• Fast waterfall with up to 200 waterfall lines per second, making it possible to decode even fast Morse code by eye (though it wasn't intended for that, it's fun to watch)
• versatile export function (text-file based, for post-processing with Excel etc.). Brian, CT1DRP has used the export functions to create spectrograms and signal graphs of the 136kHz band.
• Built-in HTTP server so you can write a (simple) user interface for SpecLab in HTML (intended to be used in a LAN, not as a fully-fledged web server).
• Communication with other applications through a simple message-based system, which is also used by SpecLab to communicate with the RDF calculator (range-and-bearing calculator + map plotter, link may work on the main site only).

TrueRTA is an audio analyzer application for testing and evaluating audio systems using a Windows PC with basic sound capability. The instruments found in TrueRTA include: High-Resolution Real Time Audio Spectrum Analyzer L ow Distortion Signal Generator Digital Level Meter. UltimaSound: A free PC-based audio speech and music spectrogram (frequency spectrum analyzer) software. UltimaSound is a real-time audio signal analysis software, and it is FREE.! With UltimaSound spectrogram software and a laptop, you can see a vivid picture of your voice and music in frequency domain in real time!

(screenshot of 'Components' window from an older version)

Features which this analyzer does not have (but others do...):

• Due to its 'Laboratory' nature, this analyzer is not as easy to use as ARGO (by I2PHD and IK2CZL, available on Alberto's homepage: www.weaksignals.com ).
  

Some Applications

AMSAT-DL's Earth-Venus-Earth experiment on 2.4 GHz at the Bochum radio telescope

In March 2009, a group of radio amateurs successfully bounced a radio signaloff Venus, over a distance of (2*) 45 million kilometers. A short descriptionof the reception technique (software) can be foundhere; more details are on theAMSAT-DL website, and in the AMSATjournal soon. Thanks to DD5ER, DJ1CR, DJ4ZC, DH2VA, DK8CI, DL1YDD, G3RUH,ON6UG, and everyone else who contributed, for being part of the team.
The configuration used for the (2.4 GHz) EVE test is part of the installationpackage now (EVE-SDR-IQ-5kHz_2G4.usr); we used the SDR-IQ for this. If youwant to try something similar and have a PERSEUS receiver, useEVE-Perseus_2G4.usr instead.

Beacon Logger for DI2AG (July 2005)

How to use Spectrum Lab to produce field strength plots of DI2AG, an experimentalmedium wave beacon on 440 kHz in southern Germany. It realizes some ideaswe spoke about at the Ham Radio fair in Friedrichshafen (June 2005). Moreinfo in this document (up to now, in german language only) :Beschreibung des Einsatzes von SpectrumLab als Bakenlogger für DI2AG. Update 2007: DI2AG has moved to 505kHz now (which is a new amateur radio band in many countries - with the exceptionof Germany..).

Hellschreiber Modes in Spectrum Lab (Nov. 2004)

There is a special narrow-band transmission mode in Spectrum Lab's 'digimodeterminal' called Chirped Hell, based on an idea by Markus, DF6NM. We usedit on the amateur longwave band (136 kHz) to make some narrow band transmission.A special property of Markus' Chirped Hell principle is the relatively lowcrest factor, so it can be used to transmit characters (and even small images)quite effectively, but (unlike sequential multi-tone hell) you need a lineartransmitter. An image received on a waterfall in 'QRSS 3' mode may look likethis:

LowFER Receiver Using a 'Software' IF

This article by LyleKoehler, KØLR, describes a simple 'software defined' receiverand some other (easier-to-use) alternatives to SpecLab too. Don't miss Lyle'sdownconversion circuits which he sucessfully uses to the receive US-AmericanLowFER beacons. The last part describes how to log fieldstrengths of LowFERbeacons with Spectrum Lab's plot window.

G7IZU Radio Reflection Detection Page

This nice website by Andy G7IZUmonitors Meteor Shower, Aurora Sporadic-E and Solar Flares in real time,mostly using reflections of radio signals in the 50 MHz region.

VE2AZX precise frequency measurements

Jacques, VE2AZX, describeshere how SpectrumLab can be used for precise frequency measurements in the millihertz region.Don't miss his detailed description - it's actually better than SpecLab'sbuilt-in help system ;-)

Bat Converter

If you have a suitable soundcard, you can use SpecLab to make ultrasonicbat calls visible and audible in real-time. In the menu, select 'QuickSettings'..'Natural Radio / Animal Voices' .. 'Bat Converter'. This configurationrequires a soundcard with true 96 kHz sampling rate, and a PC with at least1.7 GHz. The software shows the call in a fast spectrogram (with high timeresolution, but little frequency resolution), and converts the ultrasounddown to audio, notches out constant-frequency 'carriers' (like your CRT monitor'sline sync frequency, which is annoying if it's in the 'bat band'), and finallypasses the downconverted and filtered signal through an automatic gain controlstage.

As a test, I used a cheap miniature electret microphone to makethis recording of bat sounds(96 kHz, 16 bit, mono .. right-click to save it). If you play it with a normalaudio player, you will hardly hear anything. But if you play it into SpecLab(menu 'File'..'Audio Files'..'Analyze and Play', with the 'Bat Converter'setting loaded, you will hear the bat calls. I don't know which species itis yet, but they seem to be quite frequent in this part of Germany.

FFT Filter Plugins

The FFT-based filter in Spectrum Lab is already very versatile, but it canstill be extended with a 'filter plugin'. These plugins come in the formof a special windows DLL which can be loaded from the filter control panel.Such plugins can be written with any C / C++ Compiler (recommended: BorlandC++Builder V4 or DevCpp V4.9.9.2; the latter is a free development systembased on the GNU / MinGW compiler). To develop your own plugin, downloadthis FFTFilter Plugin package - it contains all required information requiredto write a filter plugin, and a sample plugin written in the 'C' programminglanguage. NOTE: THE DLL INTERFACE IS STILL 'SUBJECT TO CHANGE' !

Download Spectrum Lab..

To check if you have the latest version of Spectrum Lab, compare the textin the main window's title bar with the revision number and compilation dateat the top of this document. For example, if you have 'Spectrum LaboratoryV2.2 b1', it is way too old. If you have SL already installed, you can checkif it's up-to-date by selecting Help .. Check for Updatein the main menu. The primary download site for Spectrum Lab is here:

• Primary: www.qsl.net/dl4yhf/speclab/install_speclab.zip,
  (V2.95 b3, compiled 2020-10-03 or later, with new output switches, a bugfix in the noiseblanker, Ogg/Vorbis audio file reader and -writer, wave files with 24-bit integer and 32-bit floating point samples, GPS (NMEA) decoder also through the soundcard, input resampler optionally using the GPS PPS output for synchronisation, support for Winrad-compatible ExtIO-DLLs (also for FiFi-SDR), new controls for the filter passbands on the main frequency scale... see revision history.
  The latest additions were:
  • OpenWebRX-alike server for remote live audio and waterfall in a web browser (details here)
  • Extended CAT/CI-V protocol to display broadband spectra from an IC-7300, IC-7610, IC-7851, etc(?)
  • Forwarding of CI-V messages from and to multiple clients (e.g. WSJT-X, RS-BA1) on extra serial ports
  • Timestamped event queue for the Conditional Actions
  • Non-differential encoding for experimental (B)PSK transmissions
  • New sample formats received over the serial port (e.g. from the GPSDO currently under development)
  • Modified the reader for non-compressed, timestamped web streams (and their logfiles; *.dat)
  • Modified triggered audio recorder
  • Modified COM port enumeration because a stupid Bluetooth driver blocked the application for many seconds
  • Spectrum buffer can be retrieved as JSON object via SL's integrated web server
  • Different buffer sizes for audio processing and soundcard I/O
  • Modified Audio-I/O DLL interface (bugfix in the configuration dialog)
  • Support for RTL-SDR (via ExtIO-DLL)
  • Improved speed, at the expense of compatibility with ancient 80486
  • EbNaut-recorder configuration files
  • Compressed Ogg/Vorbis file selectable for recording audio (besides non-compressed Wave audio)
  
  
• Backup: http://dl4yhf.darc.de/speclab/install_speclab.zip.
  
• Installer-less ZIP: www.qsl.net/dl4yhf/speclab/SpectrumLab_without_Installer.zip.
  
• 'BETA': www.qsl.net/dl4yhf/speclab/install_speclab_beta_2020_06_25.zip
  (This is seriously 'under construction', and is really 'only for beta testing' yet..):
  Contains all the above, plus some new (unstable) features which are not required for 'normal' use:
  Automatic closing of audio devices shortly before system suspend ('PC sleeping'), and automatic re-opening after resume ('wakeup from sleep'), and a tiny subset of the OpenWebRX server functionality which can be used to put your IC-7300 or IC-9700 'online'.
  If the beta-installer doesn't exist, there is no 'beta' at the moment, so use the release version above.
  Details about the new installer (with separate 'Program' and 'Data' folders) are here. If the new installer doesn't work on your system (especially Vista / Windows 7), please report your observations on the Spectrum Lab User's group at groups.io - thanks in advance .
  

As an alternative, check the download section onKo Versteeg's website .
Don't trust any other download site - neither 'softpedia', nor 'freedownloadmanager',nor anyone else because you never know what those sites did to/with the files.Some of those sites claim they performed an extra 'virus check', but noneof those site's owners has ever asked me (the author of Spectrum Lab) for permissionto re-distribute or even re-package the installer, so 'by default' I would not trust any of these sites.
The archive includes EXE-file, sample setting files, help system (in HTMLformat) and a few other goodies, but not utilities below.

Some additional utilities which may be useful:

• Winamp output plugin to send audio data directly from Winamp to Spectrum Lab (not via soundcard)
• FFT filter plugins allow you to insert your own subroutines (compiled into a DLL) into the signal path, where signals are processed in the frequency domain .
• Soundcard utility sourcecodes contains an example to send an audio stream to Spectrum Lab, using WM_COPYDATA messages.
  The zipped archive also contains the 'C' headers with structure definitions for interaction between SL and other applications (audiomsg.h) .

If you want to write your own program to control Spectrum Lab, readthis document which explains howto communicate with it using simple WM_COPYDATA messages (the same datastructures are used to exchange audio via UDP or TCP, too).

Download modified 'htdocs' filesto use Spectrum Lab like an OpenWebRX server

You don't need this if you don't intend to use SL as 'Web Receiver' (server) !

Since 2020-06, the HTTP server integrated in Spectrum Lab can optionally'host' a modified variant of HA7ILM's Open Web Receiver,as described in the Spectrum Lab manual.Because the OpenWebRX 'htdocs' folder contains a large bunch of Javascriptmodules which are not required for normal use, these files are notcontained in the Spectrum Lab installer (downloadable from a link in theprevious chapter). Instead, if you want to use Spectrum Lab like anOpenWebRX server, get those slightly modified files from here:
www.qsl.net/dl4yhf/speclab/OpenWebRX_for_SpectrumLab.zip
In addition to Spectrum Lab itself, the above files (based on the originalOpenWebRX 'htdocs' folder) are all you need to get this running. Just unpack these files into a folder of your choice (e.g. 'C:OpenWebRx'),and let Spectrum Lab's HTTP server know where those files are asdescibed here. There are no dependencies to install, you neither need Python nor CSDR, since the entire HTTP server is integrated as a C/C++ module in Spectrum Lab.The demodulated audio and waterfall is simply taken from SL itself (or from an IC-7300 / IC-9700's 'Spectrum Scope' display). Thus unlike a multi-channel Kiwi SDR, all clients connected to our server will actually see and hear the same, and only one of the userscan control the receiver - if you allow him to. But it's good fun if, during a QSO, you can give the fellow ham the URL (or IP address) of a website where he can listento his signal in your receiver, or see how crowdedthe band is on your end (instead of using one of thehundreds of WebSDRs and KiwiSDRs around the globe).
The original OpenWebRX itself was available (*) on Github, see
github.com/simonyiszk/openwebrx
Also don't miss Andras' BSc thesis about OpenWebRX,which (in 2019) could be downloaded from
sdr.hu/openwebrx

Note:

The Github repository has been archived by its owner (Andras, HA7ILM), since the original OpenWebRX development has been discontinued in 2019-12-29. There may be forks from the original project still actively developed (the Kiwi Web SDR is also based on it), but I didn't check if those forked HTML- and Javascript modules can also be hosted by Spectrum Lab.
Since the original OpenWebRX was published by HA7ILM under Affero GPL v3 license, the modified files are distributed here under the same license. Unlike the original OpenWebRX license, there is no commercial license available for it (neither for the modified OpenWebRX files nor for Spectrum Lab).

• Audio Spectrum Analyzer - OscilloMeter
  Audio Spectrum Analyzer for Real-time, FFT, OscilloScope, Frequency counter, voltmeter, noise and distortion meter, phase shift meter. Multi-Tone Sound Frequency Sweep Generator. White, pink noise.
• Zelscope
  Zelscope is a Windows software that converts your PC into a dual-trace storage oscilloscope and spectrum analyzer. It uses your computer's sound card as analog-to-digital converter, presenting a real-time waveform or spectrum of the signal - which can be music, speech, or output from an electronic circuit.
• Spectrogram
  Shareware dual channel audio spectrum analyzer for Windows 2000/XP which can provide either a scrolling time-frequency display or a spectrum analyzer scope display in real time for any sound source connected to your sound card. Can be used for MTHELL, QRSS and DFCW by R S Horne
• Spectrum Lab
  DL4YHF's Audio Spectrum Analyser Spectrum Lab or Speclab started as a simple FFT program running under DOS a long time ago, but it is now a specialized audio analyzer, filter, frequency converter, hum filter, data logger and more.Can be used for MTHELL QRSS, DFCW, PSK, MSK, Castle
• Audio spectrum analyzer
  Analyzes audio from 10 Hz to 20 kHz, input from microphone or wave file, Variable sample rates (8000 Hz, 11025 Hz, 22050 Hz, 44100 Hz)Variable transform sizes (1k, 2k, 4k, 8k)Upper and lower limits adjustableContinuous, averaged, peak hold
• HamAlyzer
  HamAlyzer is a spectrum analyzer made just for hams, save plot images easily for emailing, monogramed with your call sign.HamAlyzer looks no more supported, here 2.8 trial version available. Download hamalyzer
• Cobracom
  Oscilloscope, Realtime spectrum analyzer, Impedance meter, RLC bridge and signal generator for Windows. Is a Windows application that converts your PC into a powerful dual-trace signal analyzer (oscilloscope, FFT etc...) . Uses your PC sound card as an Analog-to-Digital a Converter to digitize any input waveformand as Digital-to-analog Converter for the signal generator.True 24 bit adc/dac 48K/96k/192k sampes/sec.
• Soundcard Audio Tools and Toys
  Soundcard audio tools and toys, experimental ideas and utilities.Signal Generator, Frequency-counter / instrument-tuner, Real-time Spectrum Analyser

• Audio Kit for iPhone- Audio Kit is a collection of four iphone applications which are essential for those working in audio and sound. A real time Spectrum Analyser, a Scope to display waveforms, an SPL Meter, and a sine wave Signal Generator.
• Audio spectrum analyzer^pop- Analyzes audio from 10 Hz to 20 kHz, input from microphone or wave file, Variable sample rates (8000 Hz, 11025 Hz, 22050 Hz, 44100 Hz)Variable transform sizes (1k, 2k, 4k, 8k)Upper and lower limits adjustableContinuous, averaged, peak hold
  [ Hits: 29942 | Votes: 53 | Rating: 3.87 ]
• Audio Spectrum Analyzer - OscilloMeter^pop- Audio Spectrum Analyzer for Real-time, FFT, OscilloScope, Frequency counter, voltmeter, noise and distortion meter, phase shift meter. Multi-Tone Sound Frequency Sweep Generator. White, pink noise.
• AudioXplorer- AudioXplorer is a sound analyzer software designed for Mac OSX, provide a real-time analysis window where you can visualize the sound spectrum and sonogram
  [ Hits: 440 | Votes: 1 | Rating: 9 ]
• Axis Spectrum Analyzer- Axis Spectrum Analyzer allows you to record audio along with sincronized 31 band spectrum analyzer readings from any audio source to be inputed into Macromedia Flash movies in an easy to integrate way. The software can also be used to display real-time audio with customized visuals on video devices such as projectors, tvs,etc.
• Baudline signal analyzer- A Linux based FFT spectrum analyzer designed for time-frequency browsing and scientific data visualization. Oscilloscope waveform, statistical histogram, accumulated spectral trace,Weak Signal reception, continuos data logging, FFT Analyzer and specialized measurement windows.
  [ Hits: 12215 | Votes: 32 | Rating: 8.85 ]
• Cobracom- Oscilloscope, Realtime spectrum analyzer, Impedance meter, RLC bridge and signal generator for Windows. Is a Windows application that converts your PC into a powerful dual-trace signal analyzer (oscilloscope, FFT etc...) . Uses your PC sound card as an Analog-to-Digital a Converter to digitize any input waveformand as Digital-to-analog Converter for the signal generator.True 24 bit adc/dac 48K/96k/192k sampes/sec.
• EIS Spectrum Analyser- Freeware program for analysis and simulation of impedance spectra
  [ Hits: 5259 | Votes: 7 | Rating: 4 ]
• Fatpigdog's Real Time FFT Audio Spectrum Analyzer- Fatpigdog's Real Time FFT Audio Spectrum Analyzer. User interface has the look and Feel of an HP Spectrum Analyzer. But, in addition to the regular Spectrum Plot, it also produces detailed Waterfall plots. The user can optimize the color map, chosing from a wide assortment of color themes. This analyzer supports multiple traces, trace arithmetic and normalization.
• FFT Explorer- A free (GPL) Linux (Xwindows GUI-based) utility that performs spectral analysis on real-time data from a sound card or other source, and can analyze the spectra of various sound file types. It can also accept data from many kinds of applications in plain-text form by way of the 'named pipe' feature of Linux
  [ Hits: 10762 | Votes: 7 | Rating: 5.43 ]
• Freq 51- Program samples the input, performs an FFT, and graphs the output
• Frequency Response Plotter- Draw static response time of an audio system. Originally intended for loudspeakers tests, is also a great tool for looking at microphone equalisation.
  [ Hits: 911 | Votes: 3 | Rating: 9 ]
• HamAlyzer^pop- HamAlyzer is a spectrum analyzer made just for hams, save plot images easily for emailing, monogramed with your call sign.HamAlyzer looks no more supported, here 2.8 trial version available. Download hamalyzer
• Linrad- Multiplatoform freeware DSP software. Linrad has its origin in software that was developed for 144 MHz EME CW but it is quite general and should be seen more like a kit for designing a receiver that a receiver for some particular usage.It can be used as a CW receiver with a small time delay and a fast waterfall graph. A dsp for conventional receiver to imporve signals readability, a spectrum analyzer.
  [ Hits: 9652 | Votes: 16 | Rating: 8.01 ]
• Mac the Scope- Mac the Scope is a professional quality signal analyzer, 1/3 octave RTA, signal generator, and more.
• MDS Spectrum Analyzer- Software for radiomonitoring, radio spectrum analysis. MDS is designed for the real time radio spectrum analysis. It performs real time activity analysis, signal search and collects spectrum data for post time analysis.
  [ Hits: 3205 | Votes: 8 | Rating: 6.88 ]
• Noise Meter- Noise Meter software for the noise meter tool by G8KBB that measure noise using a PC sound card and calculate noise figures by means of a calibrated noise source.
• PicoScope- Pico Technology have developed a wide range of professional PC-based instruments that offer all the functionality of conventional test equipment (DSO - digital storage oscilloscope, spectrum analyzer, meter), and also many features not normally available in this price range. Available functios are Oscilloscope, Spectrum Analyser, XY Scope, Meter and Measurements
  [ Hits: 13262 | Votes: 8 | Rating: 8.37 ]
• PSELab freeware- PSELab is a freeware Windows application useful to estimate power spectrum and short-time spectral distribution of signals. The application uses periodogram, least squares Prony, Burg, covariance, MUSIC and some other methods. To estimate short-time spectral distribution, the application uses short Time Fourier transform, pseudo-Wigner-Ville transform, least squares Prony, Burg, covariance, MUSIC and some other methods.
• RightMark- RightMark Audio Analyzer
  [ Hits: 4013 | Votes: 3 | Rating: 5.33 ]
• RMAA- Right Mark Audio Analyzer is a suite designed for testing quality of any audio devices, be it a sound card, an MP3 player, a consumer CD/DVD player or a radio.
• S Meter Lite Software- S Meter Lite is a no-cost program that displays your receiver's S Meter signal strength in a window by W8WWV
  [ Hits: 6807 | Votes: 4 | Rating: 2 ]
• Scan*Star- Radio monitoring and analysis tools. Scanning, searching, spectrum analysis and traffic analysis. Amateur, Industry & Government,
• Signals Analyzer- Signals Analyzer it's a a program, which is designed for the very qualitative analysis of different signals. The one of main fields of SA application is the analysis of unknown or unclear, strange signals. This programm will be very usefull to everyone from professional analysts to amateurs.
  [ Hits: 4932 | Votes: 5 | Rating: 9.8 ]
• Signals Analyzer- Signals Analyzer – it is the program, which is designed for the very qualitative analysis of different signals. The main area of SA application is the analysis of unknown or unclear, strange signals.
• SIGVIEW spectrum analyzer- Complete real time signal analysis software with wide range of powerful FFT spectral analysis tools, statistics functions and comprehensive visualization system.
  [ Hits: 11399 | Votes: 10 | Rating: 7.6 ]
• Sonograph Spektrum Analyzer- Sonogram is a highly flexible audio spectrum analyzer for the analysis of sound, music and speech signals in the frequency-domain using different algorithms.
• Soundcard Audio Tools and Toys- Soundcard audio tools and toys, experimental ideas and utilities.Signal Generator, Frequency-counter / instrument-tuner, Real-time Spectrum Analyser
  [ Hits: 14327 | Votes: 16 | Rating: 7.75 ]
• Spectra- Accurate spectrum analyzer in the range 0 - 2500 Hz, makes an accurate FFT analysis of an audio signal coming from the soundcard
• SpectraScope- SpectraScope is a simple Windows interface program allowing your computer to view up to two audio waveforms in either the time or frequency domain. The program is a Windows soft panel operating as a dual channel oscilloscope and spectrum analyzer. The useful frequency of operation is 20 to 10,000 Hz in the time domain and 20 to 20,000 Hz in the frequency domain. The program uses the computer sound card to capture the audio input.
  [ Hits: 10723 | Votes: 3 | Rating: 7 ]
• Spectrogram^pop- Shareware dual channel audio spectrum analyzer for Windows 2000/XP which can provide either a scrolling time-frequency display or a spectrum analyzer scope display in real time for any sound source connected to your sound card. Can be used for MTHELL, QRSS and DFCW by R S Horne
• Spectrum Analyzer Pro Lab- Spectrum Analyzer pro is a commercial application that will turn your computer into a modern spectrum analyzer. This will provide you with features that go far beyond the possibilities of any stand-alone hardware unit. Run under recent Windows versions, available in trial mode
  [ Hits: 935 | Votes: 2 | Rating: 10 ]
• Spectrum Analyzer Real-time FFT- Eight-channel Audio Spectrum Analyzer is a set of Real-Time Multi-Channel Gauges for investigation of data accepted from any ADC you will want or 16-, 24- and 32-bit ADC of sound card. WDM drivers support. FFT Spectrum Analysis, OscilloScope, Frequency counter, AC/DC voltmeter, Signal-to-Noise Ratio, Signal-to-Noise and Distortion, Spurious-Free Dynamic Range, Effective Number Of Bits, Total Harmonic Distortion, Inter-Modulation Distortion, Phase Shift. Special modes of dual-channel FFT spectral analysis: Separate channels spectra, Spectra of digital sum, difference, product of two signals, Spectrum of digital product of original signal and its fundamental, Spectrum of Real and Complex Transfer Function, Cross Spectrum. Standart weighing of spectra according IEC and CCIR. Oscilloscope modes (for dual-channel ADC) are: original signals, sum, difference, dependence of one channel on another, amplitude distribution of input signals.
• Spectrum Lab^pop- DL4YHF's Audio Spectrum Analyser Spectrum Lab or Speclab started as a simple FFT program running under DOS a long time ago, but it is now a specialized audio analyzer, filter, frequency converter, hum filter, data logger and more.Can be used for MTHELL QRSS, DFCW, PSK, MSK, Castle
  [ Hits: 46841 | Votes: 55 | Rating: 6.97 ]
• Spek- Spek helps to analyse your audio files by showing their spectrogram.Spek supports all popular lossy and lossless audio file formats. Spek is free software available for Unix, Windows and Mac OS X.
• TCube- TCUBE is a combination of a Spectrum Analyzer and a Two Tone Generator, with optional quadrature outputs. It can be used for measuring the intermodulation behavior of an audio circuit, and as a general purpose tool
  [ Hits: 8370 | Votes: 10 | Rating: 5.5 ]
• Virtins Technology- Offer PC based virtual instrument for electronics enthusiasts, students and professionals, including full-fledged sound card real time Oscilloscope, Spectrum Analyzer and Signal Generator.
• Zelscope^pop- Zelscope is a Windows software that converts your PC into a dual-trace storage oscilloscope and spectrum analyzer. It uses your computer's sound card as analog-to-digital converter, presenting a real-time waveform or spectrum of the signal - which can be music, speech, or output from an electronic circuit.
  [ Hits: 70683 | Votes: 27 | Rating: 5.12 ]

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