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Shareware dual channel audio spectrum analyzer for Windows 2000/XP which can provide either a scrolling time-frequency display or a spectrum analyzer scope display in real time for any sound source connected to your sound card. Can be used for MTHELL, QRSS and DFCW by R S Horne

Audio Spectrum Analyser Spectrum Lab or Speclab started as a simple FFT program running under DOS a long time ago, but it is now a specialized audio analyzer, filter, frequency converter, hum filter, data logger and more. Can be used for MTHELL QRSS, DFCW, PSK, MSK, Castle. Spectrum Lab is a free audio analysis tool, lets you see the hidden world of sound. It analyzes live audio or recordings, showing you the exact frequencies present. Watch sounds change over time with a waterfall display. Need to clean up your audio? It can filter out noise in real-time. Even play with radio signals by decoding and creating special modes! While ideal for amateur radio enthusiasts, anyone can explore the science of sound for free.

A full size half-wave 30m dipole installed in an attic

Program designed to do spectral analysis and real-time audio filtering on reception of audio signals for EME, VLF, SETI applications. Offer support for MTHELL, QRSS, DFCW, NDB, WSJT by I2PHD

Argo is a freeware windows viewer for MTHELL, Slow CW, like QRSS and DFCW. Can be used for EME operations by I2PHD and IK2CZL

CW/QRSS beacon, based on a microcontroller PIC16F84, by Microchip, with only few other components. Schematic and component list available

A home made QRSS beacon project for the 10 MHz by VK2ZAY

This simple 30m QRSS beacon is built entirely out of junkbox parts, the only component purchased specifically for this project was the 10,140kHz crystal. Hans Summers' 30m QRSS beacon project emphasizes simplicity and low cost, built almost entirely from reused parts. Key components include a 10,140kHz crystal, a 2N3904 transistor from a broken DVD player, and an ordinary LED used for frequency shift. The oscillator is stabilized in a polystyrene box, with power amplification driven by recycled copper PCB. Output power peaks at 360mW, and a custom 50-ohm dummy load manages heat. Though aesthetically unconventional, the beacon works effectively, fulfilling the project's low cost aim.

glfer is a program for reception and transmission of QRSS/DFCW signals. It is composed of two main parts: the spectrogram window, where you can see the spectrum of the received signal vs. time the transmission functions, to emit cw characters at a slow but precisely controlled speed, using the QRSS (slow CW) or DFCW (Dual Frequency CW) modes

This Windows MTHELL QRSS NDB and DFCW program extends possibilities of well-known Spectrogram with some new useful features. It enables to define the scrolling area to any size, it can save screen shots in defined time periods , it enables to browse the saved pictures easily by OK1FIG

This simple 30m QRSS beacon is built entirely out of junkbox parts, the only component purchased specifically for this project was the 10,140kHz crystal.

G0UPL QRSS receiver inspired by I1DFS receiver

Screenshots of live QRSS signals from all over the world

ON7YD narrowbands modes on 136 Khz

30 meters beacon from UK. QRSS is a method of sending very slow morse code.

Article on a QRSS receiver for 30 meters band

Operational mode QRPp QRSS Running as an MEPT Manned Experimental Propagation Transmitter

10MHz WSPR and QRSS Transmitter Project

This article describes a simple QRSS beacon exciter for the DX portion of the 2200m amateur band.

A borderline insane 30m QRSS beacon project, completely independent of computer control and containing NO microprocessors!

IK2PII describe here a simple direct conversion receiver, thinked for QRSS and DFCW communications, as companion of ARGO or SPECTRAN programs.

pictures and description of QRSS activity

Using absurdly low-speed CW for "communications"

QRSS pictures and examples from IW0HK ex IW1CXZ

transmite equipment, collections of qrss signals received

Receiving QRSS CW on your PC by G0MRF

A QRSS beacon on 30 meter band project wind and solar powered based on a loop antenna.

Describes IK1ZYW 10m beacon running QRSS

A schematic diagram of a homemade direct conversion receiver for 30 meters band

A blog dedicated to QRSS

QRSS operations on 30M with an home made dipole

Designs for QRSS TX and other Arduino based systems

QrssPiG is short for QRSS (Raspberry)Pi Grabber able to process I/Q stream from an rtl-sdr, HackRF or other sdr devices

The N0QBH QRSS project page, a couple of projects using available kits for improved frequency and timing stability. A configurable DDS VFO 100mW transmitter with LCD display and a modified Hans Sommers 40m 100mW transmitter

A portal of QRSS images, automatically Updated with Active QRSS Grabberers

An unique method to listen to QRSS signals is... using an old tape recorder with variable speed

Ham radio activity and homebrew from Italy with some interesting article on QRSS, decoding interfaces, APRS and antennas

This page discusses the use of the new Version 4 RTL-SDR dongle for simple QRSS reception. The author shares their experience with connecting the dongle to a PA0RDT miniwhip antenna and using RTLSDRlop QRSS software. They encountered issues with Linux but found a solution with a new driver. The page also provides information on coupling multiple dongles to one antenna and adding selectivity with a divider-filter box. Hams interested in experimenting with RTL-SDR technology, antenna setups, and software for QRSS reception will find this content useful.