PI5RTA at terAA - Helmond

PI5RTA at terAA - Helmond

HF/VHF/UHF WebSDR receivers

The WebSDR system is a Software-Defined Radio receiver connected to the internet, allowing many listeners to listen and tune it simultaneously. SDR technology makes it possible that all listeners tune independently, and thus listen to different signals; this is in contrast many classical receivers available on the internet.
PieterTjerk de Boer, PA3FWM (University of Twente) has developed a software program, called WebSDR, that serves the received radio spectrum to many users via a web page, providing a wide waterfall view and giving users the ability to tune around independently and listen to signals they are interested in. It is a useful program for new and experienced radio amateurs. It is usefull for monitoring radio signals as well as investigation of radio propagation. Listening to your own transmitted radio signals is widely used. Also digital signals can be received and decoded from the audio output.

Programs used to decode digital signals with the aid of the WebSDR:

WSJTX Wisper program MixW2 decoding of digital signals MMSSTV SSTV program MMTTY RTTY program Virtual Audio Cable

WebSDR servers:

WebSDR.org with nearly 160 WebSDR servers World Wide Fontys HF WebSDR Fontys VHF/UHF WebSDR

WebSDR Explained

Login name or callsign, not necessary

Click the left mouse button on the waterfall you want to listen to

The modulation mode is automatically set for LSB on 160m, 80m and 40m, all other bands set to USB

Drag inside the tuning marker to adjust the frequency.

Drag the yellow flanges of the tuning markers to increase/decrease the tuned bandwidth

Roll the mouse wheel in the frequency part to tune
Roll the mouse wheel in the waterfall part to zoom in or out

ISS Packet radio downlink on 145.825 MHz

under the waterfall further possibilities are indicated

Frequency set with the + and -

store the frequency into memory

bandwidth and to set the desired modulation form

waterfall set zoom in and zoom out

waterfall speed slow, medium and fast

the size of the waterfall, small, medium and large

waterfall set frequency spectrum weak, medium and strong signal

strength meter signal and volume, mute and squelch auto notch

a strength meter signal and volume, mute and squelch auto notch audio recording and signal strength plot

then the number of users of the WebSDR