This is a test recycled RS41 radiosonde (APRS and RTTY), located in

Center for New Technology (CNT)
Technical School Rudjer Boskovic (TSRB)
Getaldiceva 4
Zagreb, Croatia

Server is working on Raspberry Pi3 with RTL-SDR stick.

We have radio club section, callsign 9A1RBZ.
System is operated by Darko, 9a7aof.

More information about the WebSDR project can be found on

Hamradio hack: Recykling RS41
Hamradio hack: Qyon / STM32_RTTY
Hamradio hack: ham radio | Hackaday

Useful: Dl Fldigi is an adapted version of the excellent free FLdigi soundcard decoding software
Useful: dl-fldigi_RTTY_CFG.png
Useful: The software Packet-Radio TNC
Useful: Convert Coordinates

Meteo: Lov na meteoroloske radiosonde 2017
Meteo: La Chasse aux radiosondes
Meteo: Nástroje pro sondy
Meteo: QZSS+GPS Ephemeris Data
Meteo: Index of

It seems you are using a mobile device; click here to switch to the mobile version of this site.
It seems Java is not installed or disabled on your computer. You need to install and/or enable it for this website to work properly.
Since Java version 7u51, Java needs to be enabled separately for each website; see for instructions.
Your browser does not seem to support HTML5 WebAudio; please try a recent version of Firefox, Chrome, Opera or Safari; or switch to Java.
Allow keyboard:
j k ← →: freq down/up (+shift/ctrl/alt faster)
u l c a f: USB, LSB, CW, AM, FM
z Z: center/zoom waterfall
g: enter frequency

Frequency: kHz

Or tune by clicking/dragging/scrollwheel on the frequency scale.
? kHz @ -6dB; ? kHz @ -60dB.
Or drag the passband edges on the frequency scale.
Waterfall view:
Or use scroll wheel and dragging on waterfall.

? dB; peak ? dB;
mute squelch autonotch
Volume: Signal strength plot:

This WebSDR is currently being used by ? user(s) simultaneously:      compact view

This chatbox is intended to discuss the operation of the WebSDR.
The operators of this site disclaim any responsibility for text appearing in this chatbox.


Flag Counter