- QTH
- Barcelona
- Web
- websdr.housing.salleurl.edu:8901
La Salle university's WebSDR. Shortwave with the classic websdr.org dial: drag across the waterfall and listen.
No licence
Listen
Listening needs no licence and no exam. A WebSDR is a real radio with its antenna on a roof: you drive it from the browser and hear what it hears.
Four things to find your way
- Mode
Below 10 MHz hams talk on LSB; above, on USB. Broadcast stations use AM. VHF repeaters, FM.
- Time
By day, the high bands (20 metres and up). At night, the low ones (40, 80 and mediumwave).
- Waterfall
The falling screen is the spectrum: every line is a signal. Click one and listen.
- Patience
There are quiet spells. Check the DX cluster for who's on now and where.
Receivers close to home
Real radios with their antenna on a roof, driven from the browser. Pick a frequency and a mode and you hear what that antenna hears.
WebSDR La Salle-URL EA3HRU · KiwiSDR - QTH
- Catalunya
- Web
- z-ha-dum.duckdns.org:8073
A KiwiSDR from 0 to 30 MHz: all of longwave, mediumwave and shortwave on one screen. The front-page dial tunes this one.
sdr.h.nit.cat - QTH
- Catalunya
- Web
- sdr.h.nit.cat
A Catalan OpenWebRX+. Frequency and mode live in the address, so you can share a link already tuned.
WebSDR ARDAM - QTH
- Ordino, Andorra
- Web
- sdr.radioandorra.org
The Andorran radio amateurs' receiver, up in the mountains: little city noise.
WebSDR REM Madrid - QTH
- Madrid
- Web
- rem-esp.spdns.org:8901
The Spanish amateur Emergency Network's WebSDR, mobile version.
EA3RKE · VHF - QTH
- Catalunya
- Web
- ea3rkevhf.sytes.net
A 2-metre receiver: repeaters and local chat on FM. Tuned to 145.575 MHz.
Sometimes offEA3ABM · VHF - QTH
- Catalunya
- Web
- ea3abm.ddns.net:8073
Another VHF receiver, on 145.500 MHz, the FM calling frequency of the 2-metre band.
Sometimes off
Maps and lists of receivers
For when the local ones fall short: hundreds of antennas all over the world.
websdr.org - QTH
- —
- Web
- websdr.org
The original WebSDR list, with each one's coverage and how many people are listening.
KiwiSDR público - QTH
- —
- Web
- kiwisdr.com
Every open KiwiSDR in the world, with free slots.
ReceiverBook - QTH
- —
- Web
- receiverbook.de
Map of OpenWebRX receivers: click the map and listen from there.
rx-tx.info - QTH
- —
- Web
- rx-tx.info
Another map that brings WebSDR, KiwiSDR and OpenWebRX together.
Other things to hear and see
ADS-B Exchange - QTH
- —
- Web
- globe.adsbexchange.com
Aircraft live. Every plane broadcasts its position on 1090 MHz and thousands of hobbyists receive it with a €30 SDR and share it.
DX Fun Cluster - QTH
- —
- Web
- dxfuncluster.com
The board where hams post who can be heard right now and on which frequency. Tells you where to point a WebSDR.
HamClock - QTH
- —
- Web
- quim.sytes.net:8081
A live HamClock: the day–night line, propagation and the sun on one screen.
Sometimes offXReflector IPSC2 - QTH
- —
- Web
- ipsc2.xreflector.es
The Spanish DMR network dashboard: who is talking on the digital repeaters right now.
If you ever buy an SDR
A USB receiver (RTL-SDR style, around €30–40) and one of these programs turn a laptop into a radio that goes from shortwave to aircraft.
Gqrx - QTH
- —
- Web
- gqrx.dk
The easiest to start with on Linux and Mac.
SDRangel - QTH
- —
- Web
- github.com
The Swiss army knife: almost any mode, analogue or digital.
OpenWebRX - QTH
- —
- Web
- openwebrx.de
To run your own web receiver and share it, like the ones above.
Inspectrum - QTH
- —
- Web
- github.com
To look inside a recording and work out strange signals.
GNU Radio - QTH
- —
- Web
- gnuradio.org
To build your own radio out of blocks, like a circuit on screen.
FreeDV - QTH
- —
- Web
- freedv.org
Free digital voice for HF: clean where analogue is already noise.