OpenBeacon is an open source crystal-controlled QRPp beacon transmitter kit which can output a variety of slow-speed modes, including QRSS, DFCW, and Sequential Multi-tone Hellschreiber. It is configured via USB port, so there are no jumpers to set and you can easily adjust all of the operating parameters via command line. Once configuration is complete, OpenBeacon may be removed from the PC and operate stand-alone.
OpenBeacon is considered a MEPT (manned experimental propagation transmitter), which means that you should never leave the control of it unattended.
Frequency: crystal controlled
Modes: CW, QRSS, DFCW, Sequential Multi-tone Hellschreiber, Glyphcode, WSPR (experimental)
Power output: 300 mW nominal (at +13.7 VDC power supply)
Spectral purity: greatest harmonic <-45 dBc
Power supply: +5 VDC to +14 VDC
Current consumption: 50 mA at +5 VDC, 120 mA at +13.7 VDC
Control via USB on Windows, OS X, and Linux
PCB dimensions: 70 mm x 90 mm
High quality PCB with soldermask and ENIG (gold) plating
30 Meters - 10.140 MHz
40 Meters - 7.040 MHz
80 Meters - 3.582 MHz
What is QRSS/DFCW?
QRSS is a very slow speed CW operating mode where the length of the characters are significantly lengthened in order to allow weaker signals (QRP) to be able to be received on a special spectrum display with a long integration time of minutes to hours. DFCW is a similar mode, where the carrier is left on, and Morse Code characters are formed by shifting the carrier frequency up a few Hz (FSK). Sequential Multi-tone Hellschreiber (often abbreviated S/MT Hell) uses FSK to "paint" characters on the spectrum display so that they show up as graphical characters. Glyphcode uses the S/MT Hell mode to print two glyphs to represent Morse Code characters, one for a dah and another for a dit.