The Multimode QRSS Arduino shield kit was designed to accompany one of the chapters in the new ARRL book, "Ham Radio for Arduino and PICAXE". The kit has a crystal-controlled oscillator and PA providing approx 150mW of output RF power (depending on band).
This kit has now been retired, and replaced by a new Arduino shield kit.
It supports FSK modes and on/off keying, and is available for 80, 40 and 30m bands.
A sample Arduino sketch is provided (see below) which demonstrates the use of of the shield in QRSS, DFCW and FSK/CW modes.
Instructions and sample Arduino sketch
(click for larger versions)