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Wide-Band WebSDR – Shortwave Radio on the Internet

websdr.ewi.utwente.nl Tools, games & demos Interactive tools & demos Hardware & electronics Candidate
Screenshot of websdr.ewi.utwente.nl captured 2026-07-20
Page preview · captured 2026-07-20

Resurfaced independently across 8 calendar years, with breakout response in 3 of them.

submissions
16
submitters
16
observed span
2013–2026
peak thread · 59 comments
201 pts
latest 20+ return · 2022-04-20
104 pts

Submission timeline

2007–2026

One slot for every year since HN launched. Height is that year's peak points; orange marks a 100+ point or 50+ comment breakout. Select a bar to open its strongest thread.

First comments on top threads

HN comment order

There are many more of these: http://websdr.org/ Be sure to check several. Receive capability is not the same across stations or between frequency bands on the same SDR.

fr0sty·201-point thread·

I found WebSDR a while back and was fascinated by it, however I was surprised to find out the author, an EE/CS prof[1], has a very closed source view of both the client-side JavaScript code as well as the server-side code. I wanted to poke around the JavaScript and see what I could learn but that's explicitly disallowed by the license[2]: > Since the intended use of this code involves sending a copy to the client computer, I (PA3FWM) hereby…

There's a lot of Web-accesible SDR's out there for 0-30 MHz. Here are some based on the KiwiSDR hardware: List: http://kiwisdr.com/public/ Map: http://rx.linkfanel.net/

sciurus·104-point thread·

An index of others also online at: http://www.websdr.org

The first top-level comment from each of the four biggest threads, in HN’s own order. Excerpts are shortened; open a comment for full context.

Breakout years
3

100+ points or 50+ comments

Total points
568

reference only — not used in Hall rules or ranking

Total comments
131

reference only — not used in Hall rules or ranking

Every submission

DateTitle as submittedByPointsComments
2013-04-05HTML5 WebSDR - a full short-wave spectrum radio receiverFiloSottile40
2014-03-29Wide-band WebSDR in JO32KFctoth10
2014-06-23Wide-band WebSDR in JO32KFquasque100
2015-05-20Wide-band WebSDR: Control a short-wave receiver over the webSoulMan5417
2015-06-16Wide-band WebSDR in JO32KFkumarski20
2018-04-14Wide-band WebSDR – tune a radio receiver simultaneously with other userspizza30
2018-11-30WebSDR – Shortwave Radio on the InternetFirst breakoutbane14536
2020-03-14Wide-Band WebSDR – Shortwave Radio on the InternetBest threadsndean20159
2022-03-01Listen in on Unencrypted Russian Military Commsvincvinc61
2022-03-04WebSDR – listen to and control a short-wave receivergraderjs30
2022-03-08Wide-Band WebSDRTijdreiziger30
2022-03-10Wide-Band WebSDR in Enschede, the Netherlandswglb60
2022-04-14Wide-Band WebSDR in Enschede, the Netherlandslelf20
2022-04-20Wide-Band WebSDRLatest 20+ point returnsmusamashah10417
2025-09-07Wide-Band WebSDRaxiomdata316181
2026-06-02WebSDRandai60