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The Legacy of Mr George W. Broome
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....Ambientscape WebSDR....
@ The Crystal Radio Receiver Earth Station
Through OpenWebRX+
Based in Harrow the Ambientscape WebSDR is a radio receiver comprised of an RTL-SDR, SDRplay and HackRF Software-Defined Radio from a mobile Receive Only Earth Station. This WebSDR is intended to be an educational tool for those that may have an interest in amateur radio or satellite communication.
Radio is a mode for transmitting and receiving electromagnetic waves of radio frequencies especially those carrying sound messages. Software-Defined Radio (SDR) is a radio communication system where components that have been implemented in earlier analog hardware e.g. amplifiers, mixers, filters, modulators/demodulators are instead implemented by means of software on a computer or embedded system which performs the radio signalling process.
A WebSDR is a Software-Defined Radio Receiver connected to the internet which allows many users to listen to and tune a radio simultaneously. The WebSDR provides listeners with a way of hearing or recording radio audio signals through antennas based at the Ambientscape Crystal Radio Receiver Earth Station and to experience the method of tuning a receiver using software.
The Software Defined Radio is popular in the field of radio astronomy where it can be utilised as a radio telescope together with suitable antennas, low-noise amplifiers and filters to detect phenomena such as hydrogen line emissions in the Milky Way and meteor scatter.
The Ambientscape WebSDR may be used to capture experimental live radio sound effects during frequency shifting, modulation or filtering. Scanning VHF or HF to listen to Ham radio operators and receiving audio voice signals from the ISS (International Space Station).
SDR Devices: RTL-SDR, SDRplay, HackRF
Web Server: Raspberry Pi
Software: OpenWebRX+ Web Based SDR Receiver on Linux Ubuntu 22.04
Antennas: Sirio GP 1/4 Wave Ground Plane, Scan King Discone, Magnetic Longwire Balun
Scanning Modes:
2M Band (VHF) 143.980 MHz to 146.020 MHz (RTL-SDR), 1/4 Wave Ground Plane
10M Band (HF) 27.857 MHz to 29.844 MHz (SDRplay), Scan King Discone Antenna
20M Band (HF) 13.131 MHz to 15.221 MHz (HackRF), 9:1 Magnetic Longwire Balun
Click to run the Ambientscape WebSDR through your web browser
Read instructions on how to use the OpenWebRX+ web based software
What is the ISS?
The I.S.S. International Space Staion is a large low orbiting spacecraft and home to a crew of astronauts and cosmonauts. It orbits the Earth at a height of 250 miles, 16 times a day, at a speed of 28,000 km/h and is the largest orbiting laboratory and observatory for scientific research. The ISS is used for researching space technology and a platform for STEM education.
As of October 2024 there are 10 astronauts in space:
International Space Station, Starliner CFT - Butch Wilmore, Sunita Williams
International Space Station, SOYUZ MS-26 - Don Pettit, Alexey Ovchinin, Ivan Vagner
International Space Station, SpaceX Crew-9 - Nick Hague, Aleksandr Gorbunov
Tiangong Space Station, Shenzhou 19 - Cai Xuzhe, Song Lingdong, Wang Haoze
Listening to the ISS International Space Station
Step 1: Locate the ISS Satellite
Track passing satellite with AMSAT Online Satellite Pass Predictor using the coordinates below
Station Coordinates:
Gridsquare: IO91to
Latitude: 51.6042
Longitude: 0.375
Elevation: 53M
Click to Convert (UTC) time zone to your local country time zone using the calculator
Step 2: Tune SDR to Correct Frequency
Tune the Ambientscape WebSDR on 2-Meter, 145.800 MHz to hear voice transmissions
Wait for next predicted pass overhead using timings from Online Satellite Pass Predictor
(The ISS is in range 5-6 times a day for a maximum of 10 mins, transmission schedules vary)
Current Status for all Space Satellites:
View AMSAT Live OSCAR Satellite Status
Further Links
OMIK Amateur Radio Association
Society of Amateur Radio Astronomers
The WebSDR Handbook by Philip G Collier
Talk & Demonstration on Feature-Rich Web SDRs by G7GSF