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This book aims to collect and share knowledge related to the art of QRP. There are many schemes and projects available on the web, but after some time some schemes disappear if the sites are no longer maintained.
SCHEMATIC-RF-UNIT-QRP_20W-rev21.pdf. Cannot retrieve latest commit at this time. History. 1.34 MB. Contribute to XGudron/UA3REO-DDC-Transceiver development by creating an account on GitHub.
Introduction. The Pixie 2 is a small, versatile radio transceiver that is very popular with QRP (low power) amateur radio operators the world over. It reflects a history of contributions from amateur radio operators looking to build the simplest transceiver possible.
Figure 1 — Detailed schematic diagram and parts list for the RF portion of the Universal QRP transmitter. Resistors are 1 ⁄ 4 W, 5%. A kit of component parts is available from Kanga US. 7 C10 is a VXO capacitor placed in series with the crystal to provide some frequency adjustment around the crystal frequency.
The schematic can be found in PDF format . The circuit uses a standard Bruene bridge as a directional coupler, but with a resistive voltage divider (R1 - R3). The reflected power induces a voltage at pin 3 of the coupler.
• Appoximately 1 Watt RF power • Clear, concise step-by-step instructions carefully guide you to a finished kit that not only works - but you’ll also learn too!
Chapter 6. BUILDING A HOMEBREW QRP. Among the guys I work, QRPs seem to be the most common homebrew project, second only to building antennas. Therefore this chapter describes a simple QRP design I have settled on. I use my QRPs as stand-alone transmitters or I use them to drive a final amplifier to produce higher power, 25 to 100 watts.
