N8MDP Websdr in Cleveland, Ohio

NEW: This WebSDR system now uses a Nooelec Ham-it-Up HT Upconverter. This vastly improves performance and you should recieve signals much better now.

NOTE ON AUDIO Some browsers, like Chrome, Safari, and Opera, have a tendancy to block sound from Unsecure sites, such as this one which is served by a Raspbery Pi 4. If you are having audio problems with this or other WebSDRs, check for a button in the tuner area, usually to the right of the Waterfall and Sound area where you select either Java or HTML5. Press the button to start the audio. If you are still having problems, check out the Northern Utah WebSDR site (click HERE ) for more details on solving audio problems.

WORD OF THANKS: I would like to thank Nick N4BUT and Joshua KA6NEW for helping me to get my site going with two RTL-SDRs and a Raspberry Pi 4. I especially want to thank Nick for sharing his source code with me so I could work with his interface and modify it for how I wanted to display my SDR.

Note: You need both Java and JavaScript enabled for this page to work properly. If you don't hear anything, probably Java is disabled or its version is too old (i.e., pre-1.4.2).

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 http://websdr.org/ java.html 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.

Waterfall
Signal Strength:

Speed:

Bandscope:

Waterfall:

Frequency (kHz):

Use the =kHz buttin to snap to the nearest kHz

Mode Selection:

Bandwidth: ? kHz @ -6dB; ? kHz @ -60dB.

Passband Tuning (PBT):

? dB; peak ? dB;

Hardware (20m, 40m): RTL-SDR v3
Antenna: Buckmaster DX-OCF-HP Multiband Dipole
Original interface design : UB0AZG & SV1RVL
Author of the WebSDR software: PA3FWM
Designer of this interface: N4BUT
Modifications made by: N8MDP

Logbook:

Note: time, frequency, your name/call, and DXCC information are added automatically.
View the last 20 lines of the logbook, or the entire logbook (ctrl-click for new tab/window).

Chatbox:
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.