What is Software-Defined Radio (SDR)

An SDR is a radio communication system where components typically implemented in hardware (e.g., mixers, filters, amplifiers, modulators/demodulators) are implemented via software on a computer or embedded system.

What is a WebSDR

Developed by Pieter-Tjeerd de Boer (PA3FWM), WebSDR is a specific software implementation that connects a Software Defined Radio to the Internet, allowing multiple users to listen to and tune into different frequencies simultaneously from a single receiver set.

WebSDR.org (websdr.org) - A web SDR aggregator with a list of many web SDRs available on the internet.

3413.00 kHz - USB

Heard 2026-10-31 22:00 EST on WebSDR at the University of Twente, Enschede, NL

Shortwave HF frequency used for aviation meteorological (VOLMET) services, notably from Gander, Newfoundland, Canada, and is not a standard commercial radio broadcast.

5680.00 kHz - AM

Heard 2026-10-31 23:05 EST on WebSDR at the University of Twente, Enschede, NL

5860 kHz is a shortwave frequency in the 49-meter band used by Radio Farda, a Persian‑language service broadcasting from Kuwait, with 24‑hour transmissions aimed mainly at Iran and other regions.

5900.00 kHz - AM

Heard 2026-10-31 23:00 EST on WebSDR at the University of Twente, Enschede, NL

The Overcomer Ministry is a Christian radio station broadcasting on 5900 kHz (AM) from Kostinbrod, Bulgaria, with scheduled English-language programs in the evening and overnight hours.

7265.00 kHz - AM

Heard 2026-10-31 22:45 EST on WebSDR at the University of Twente, Enschede, NL

Shortwave frequency (41 m band) used by Radio Europa for 24‑hour Dutch‑language programming aimed at Europe, transmitted from the Netherlands with 2 kW power.

Reception Modes Legend

The following common reception modes are available in WebSDR.

CW – Continuous Wave aka Morse Code
LSB – Lower Sideband
USB – Upper Sideband
AM – Amplitude Modulation
FM – Frequency Modulation
AMsync – Tries to lock onto AM signals to improve reception

Guide to use on-line (WebSDR) radio receiver

Guide-to-using-WebSDR-v20161125.pdf

Bookshelf

My GoodReads Bookshelf

Growing Up Biden

by Valerie Biden Owens

In this memoir, Valarie provides a personal and insightful glimpse into the life and upbringing of the Biden family, focusing on her brother Joe Biden, the 46th President of the United States.

Yertle The Turtle & Other S

by Dr. Seuss

A short little book with three stories for young readers. The stories are short and written with rhyming sentences and nice illustrations. The stories in this book are, "Yertle the turtle", "Gertrude McFuzz" and "The Big Brag".