DC40 receiver

Michael LeBlanc has a nice write-up on building a direct conversion radio receiver: In the late winter of 2018-19, I decided to build a receiver that would provide a performance improvement to the regen I built a couple of years ago. I wanted the radio to receive AM and SSB signals between 160m and 20m […]

Two transistor superheterodyne shortwave receiver

Dilshan Jayakody writes: This is two transistor and two IF transformer based superheterodyne receiver which is designed to receive 13m to 41m bands. With quiet good external antenna this receiver performs similar to commercially available shortwave receiver and its audio quality is in very satisfactory level. This receiver can be constructing on PCB, breadboard or […]

VHF Aircraft radio communications receiver

Dilshan Jayakody published a new build, a VHF Aircraft radio communications receiver: This is simple radio receiver project which is capable to receive aviation radio voice signals which are transmit between 118MHz to 138MHz in AM (A3E). We got initial idea of this project by reading Sverre Holm’s (LA3ZA) article about “cheap VHF receiver project”. Like […]

RadioduinoWRT – a do it yourself webradio

Raffael Herrmann wrote in to let us know about his latest project the RadioduinoWRT – a do it yourself webradio: In the last weeks I built a webradio by myself. It made from an Arduino, an hacked TP-Link WR703N router and some interface parts. It’s fitted into a beautiful Yamaha enclosing and supports the original Yamaha interface, […]

Bus Pirate script to recover bricked radio

Koolatron over at the Bitcraze forum  re-program the Crazyradio over SPI using the BusPirate and this script, available at github:  I’ve knocked together a perl script to reflash a busted crazyradio over SPI using a Bus Pirate. This saved me from a firmware upgrade gone bad. Get an assembled Bus Pirate for $30, including world-wide shipping. Also available from our […]

Futaba 10C radio hacked to accept a Spektrum DSM module

Futaba 10C radio hacked to accept a Spektrum DSM module: Tom from Damage Designs has Hacked his Futaba 10C Radio to accept a Spektrum DSM Module. Turns out these were not designed to function together but with a bit of effort Tom got them to work just fine. The actual protocol seems to be the […]

App note: Intro to digital communications systems

Digital modulation techniques are seeing increasing use worldwide. In the US, the FCC is actually mandating narrowband digital mobile radio (DMR) for certain Land Mobile Radio (LMR) users as explained in this Digital Mobile Radio Association white paper. Datasheets for various chips increasingly made reference to acronyms like GMSK, FSK and others. Agilent has published […]

Peer to peer control network uses TV spectrum white space

New patent application #20100309806 describes a peer to peer radio system designed to utilize the “white space” between TV channels. The system receives data from RF and geolocation sensors and processes them along with information from the FCC’s white space database to assign operating frequencies on a dynamic basis.