audio spectrum analyser

Low Land DX-pedition Team - Contains stories, pictures, audio files of all previous expeditions and current ones.

EI4IX Dave - Dedicated to 50MHz and 144MHz. Online 2m and 6m logs. Real Audio sound clips of Tropo, Aurora, Sporadic E, Meteor Scatter, TEP and F2 Propagation.

N1EU's Web Site - Original articles and useful hf links for contesting, TopBand 160M, FT-1000MP, Ten-Tec, SSB Audio, Mods and WriteLog

Remote controlled receivers  ^pop - Use real audio streams to listen to Hf and VHF stations around the world via remote controlled receivers connected to the web.

VR2HF Online Yaesu FT-817  ^pop Priority listing - Online Yaesu FT-817 transceiver (receive only over the Net) using R.A.T.S. control software and MS Netmeeting for program access and audio. Asia's first online receiver, first online FT-817, and worlds first full-featured online receiver (operates just like a desktop radio including audio encoding time of less than 1 second). Operating from a flat in Kowloon, Hong Kong. Open to all.

VK2FLR DX Sounds Archive - Real Audio files containing interesting examples of VHF DX propagation from Sydney, Australia

VK2QF 6m sound archive - Real audio sounds clips

VK6RO's DX Sounds Page - Clips of DX audio, some dating back to the late 70's to early 80's and up to March 2001

Gisela Dierking NF/HF-Technik Germany - Many interessting accessories, like unversal audiofilter, Mixer interface for sound card, highvoltage powersupply,accessories for 706, hamradio vacation, and more

Caltech Submillimeter Observatory (CSO) - A 10.4-meter diameter, submillimeter spectrum telescope. Situated at the top of Mauna Kea, Big island, Hawaii.

FCRAO - A 15-meter diameter, submillimeter spectrum telescope. Situated near the summit of Mauna Kea, Big island, Hawaii.

Ham Radio & DSP - Related histories, facts and opinions by EA2BAJ, includes example of PSK MT63 QPSK audio files in wav file

Interval Signals Library - Collection of audio clips of foreign radio stations, with identification announcements in various languages, signature tunes and jingles, and of course interval signals

Freeze! DXing Arctic Style - AM DXing taken to the extreme. Reports and station logs from DXpeditions to Arctic Northern Finland. Also articles, QSL news, links, audio and video on AM DXing. Published by Finnish DXer Mika M§kel§inen.

Vox Recorder  ^{updated  pop} - Vox Recorder is a Windows utility wich allows recording sound from an audio source only when an audio signal is present; its main purpose is to avoid the recording of the silence eventually present at the input. Vox Recorder has been designed in particular for radio-scanner hobbists.

RecAll - AudioCapture recorder software for Windows, Runs in the background, and starts recording when sound is detected from the microphone input.

BeaconSee - BeaconSee shows you, in real time, worldwide HF band openings on your PC. Analyses the audio signals from your radio, which is tuned to the NCDXF IARU HF beacon network and shows you the signal strength received from each of the 18 beacon transmitters as a plot of frequency spectrum against time.

Voice Descramble - This program descrambles band inverted encrypted transmissions, usually found on VHF/UHF. It uses a NCO (numerical controlled oscillator) to re-produce the originally inverted audio band.

EchoFilter - EchoFilter uses the soundcard of a PC to process income audio signals in real-time. The narrow filter bandwidth allow the extraction signals and sounds from the audio signal that may normally be close to inaudible. It is intended for radio HAMS, hobbyists, researchers, scientists and students in the DSP field.

SSB Pileup player - It plays back max 10 WAV audio data as one Real SSB Pileup Windows98/NT4

Spectra - Accurate spectrum analyzer in the range 0 - 2500 Hz, makes an accurate FFT analysis of an audio signal coming from the soundcard

Vox Actuated Recorder for Windows - Vox Recorder is a Windows utility wich allows recording sound from an audio source only when an audio signal is present; its main purpose is to avoid the recording of the silence eventually present at the input.

HI FI Audio in SSB - How to produce great audio using your SSB rig and outboard equipment. Step by Step instructions.

Interface for MS_DSP - Minimal interface circuits for receiver and transmitter audio, also for PSK31

Spectrum Analyzer Project - This is a tracking page for a tv tuners based homebrew spectrum analyzer project.