Looking for a fun weekend project? Discover the OXO QRP transmitter—an elegantly simple, high-performance HF rig perfect for homebrew enthusiasts and minimalist radio operators
CW
The CW category is dedicated to continuous‑wave operation: QRP transmitters, minimalist transceivers, practice tools, and on‑air CW related news and events. It includes projects like tag‑strip 80 m QRP transmitters, Curumim‑style minimalist transceivers, keying circuits, and code‑practice oscillators, along with posts highlighting interesting CW special event stations or resources.
Ten Minute QRP Transmitter
Build a functional “Ten-Minute” QRP Transmitter with this simple DIY guide. Featuring a minimal component count and a crystal oscillator, this ultra-fast build is perfect for beginners and ham radio emergency kits.
G4RAW 80M QRP TAG CW Transmitter
G4RAW 80M QRP CW Transmitter: The original version was built on tag strip, hence the name. For PA, we can use BD139 instead of 2SC2078. It should have good heat sink. The “G4RAW 80M QRP CW Transmitter” refers to a popular, simple, and low-power (QRP) Continuous Wave (CW) transmitter design for the 80-meter amateur radio […]
Circuits – 40M tag QRP Transmitter
Here is another qrp cw transmitter pulled out from SPRAT back issues, which is simple to build with commonly available components from every one shack. We can subsititute 2N2222 for BC108 and BD139 for BD 131.
Circuits – Pippin QRP Transmitter
This pippin QRP transmitter is basically a conventional colpitts type crystal oscillator with output taken from a low value collector load resistor and direct coupling is made into the base of PNP transistor used as an amplifier. This simple circuit develops around one watt output with 12V as power supply. At the heart of this […]
Circuits – 7 Mhz 5 Watts CW Transmitter
The above 7 Mhz 5 Watts CW Transmitter circuit was found in one of back issues of sprat. Still i am wondering how 5 watts juiced out from this tiny crystal oscillator circuit. This classic 7 MHz CW Transmitter circuit demonstrates how effective amateur radio equipment can be built with minimal components and straightforward design […]