PA9X webSDR's at JO21ev

I run two webSDR’s which are publicly accessible.
– WebSDR #1 runs on the WEB-888 platform
– WebSDR #2 runs on a SDRplay RSPduo connected to a Raspberry Pi 4B
Both use an active receive loop as antenna with different loop diameters.

Access webSDR #1

Access webSDR #2

Receiver webSDR #1

My webSDR #1 runs on the WEB-888 receiver. This device is based on the 16-bit RX-888 Mk.II SDR receiver, combined with a Zynq7010 single board minicomputer. It features 12 “channels” offering 64 MHz (!) of bandwith from DC to 64 MHz. The WEB-888 is connected to the internet via a LAN cable.

*The WEB-888 is based on the succesful RX-888 Mk.II receiver with a minicomputer as server.*

Receiver webSDR #2

My webSDR #2 runs on a SDRplay RSPduo. This is a 14-bit receiver that offers 500 kHz of bandwith. The RSPduo is connected to Raspberry Pi 4B as it’s server, running the open source OpenWebRX software as it’s frontend.

*The SDRplay RSPduo incorporates two identical receivers and can receive up to 2000 MHz.*

Antennas

WebSDR #1 WEB-888 uses an active receive antenna. A 80cm loop antenna with a Wellgood v4 amplifier board. The loop is made of a plastic hula hoop covered by a thin layer of aluminium tape. It performs best from 15 MHz to roughly 45 MHz.

*The 80cm diameter Wellgood v4 loop. In the background the 7-band Cobweb and 10m band dipole.*

WebSDR #2 RSPduo uses the same Wellgood v4 amplifier board, but with a 100cm loop made from 15mm aluminium strip. This loop performs better below 15 MHz than the 80cm loop.

*The 100cm diameter Wellgood v4 loop made from 15mm aluminium strip.*

The software and frontend

The WEB-888 runs Linux as operating system for webSDR #1. The source code is modified from Beagle_SDR_GPS. The frontend is based on OpenWebRX and offers the same features known from the KiwiSDR.

*The webSDR #1 tuned to 5505 kHz, known als Shannon VOLMET.*

The RSPduo runs with a Linux based Raspberry Pi 4B which hosts OpenWebRX for webSDR #2. It has less options than the KiwiSDR frontend, but still offers the most important controls.

*The webSDR #2 tuned to 20m amateur radio band.*

FT8 and WSPR decoding

WebSDR #1 is programmed to continuously monitor FT8 on 160m, 80m, 40m, 20m and 10m band and WSPR on 80m. Spots are uploaded to PSKReporter.info and WSPRnet.org under my callsign PA9X.

WebSDR #2 is skimming 20m FT8 and WSPR. Spots are uploaded to PSKReporter.info and WSPRnet.org under my SWL designation NL13951.

Location

My webSDR is located in the town of Vlaardingen, The Netherlands at locator grid JO21ev. An urban area where the noise floor can be high. Especially during daytime and on sunny days when nearby solar panel installations produce noise.

Lists of publicly accessible webSDR

Click to scroll through the:

list based on KiwiSDR users

list based on the WEB-888 users