There are a lot of home brew SDR-related projects on the internet at the moment. I believe the key features of this project are:
- Small but conventional radio form-factor with tuning knob AND NO PC
- A clear graphical display with S meter and real-time band-scope/waterfall (very high update-rate makes the radio a pleasure to use)
- Smooth DDS tuning with steps down to 10Hz (optical shaft encoder)
- All mode operation with excellent SSB and CW filtering (NOT double-sideband) and a decent AGC
- There are no analogue components to adjust or align, so if built correctly the radio ‘will just work’
- Based on a very low cost, commercial CPU / Display board
- Cost of major parts is about £80 (UK) assuming stuff like a case, knobs, speaker, audio amp etc can be found ‘in the junk box’.
Please bear in mind that this project will require soldering of 0603-size SMD components and a couple of fine-pitched ICs (see photo of radio PCB below).
Please contact me at moc.dlrowltn@321ylbmit (reversed) or via qrz.com for information on getting a partial kit for the radio board. The parts kit comprises >90% of the passives, some of the ICs (3V3 regulator, the 26MHz TCXO and the ADC) and a PCB. (Note the PCB is now a proper 2-layer manufactured board with plated through VIAs, solder mask and silk screen. See here) Additional build documentation will be sent out by email and this includes the buying list for the remaining parts.
I am getting lots of email, so please check the FAQ before posting questions, thanks.
There is a failrly detailed walk-through of the radio and its features on YouTube here. There is also an older and less structured video here and various videos at the bottom of this page. (Please allow for the low bandwidth of my internet link!) Also see www.qrz.com/db/G0ETP
Wipe out noise and interference before it gets into your receiver with a 60 dB null! Eliminate all types of noise — severe power line noise from... Read more
Yaesu FT-450 Reviewed by Rick Lindquist, N1RL ARRL Contributing Editor The FT-450 is Yaesu’s latest entry in the HF/50 MHz transceiver field. It’s a s... Read more
Description If it is GAIN you want from a small boom, this is the antenna for you! Wow, Super compact boom!! Massive 13.6dBi from this antenna!... Read more
In this video I show the ground radial wire I use, and talk about laying a radial field under my Hustler 4BTV vertical ham radio antenna ... Read more
Chameleon MPAS 2.0 1.8-54 MHz Modular Portable Antenna System IT’S IMPORTANT TO WATERPROOF THE CHA MIL EXT 2.0 BEFORE PERMANENT INSTALLATION Us... Read more
W7P – the Year of Pluto Special Event scheduled for December 2015 Pluto and Flagstaff, Arizona are forever linked in history. On February 18th 1... Read more
Amateur Radio Emergency Service (ARES®) volunteers in Puerto Rico continued over the weekend to report for daily duty at an American Red Cross (ARC) d... Read more
A very nostalgic look at Morse Code as taught by the Signal Corps, US Army. This is a film released by the Department of Defense, Department of... Read more
The FCC has proposed a fine of more than $400,000 on a Queens, New York, man who has admitted making unauthorized transmissions on New York City Polic... Read more
The monthly newsletter of the International Amateur Radio Union Region 1 Monitoring Service (IARUMS) typically makes for some interesting reading. Whi... Read more
“Successful Bilateral Transatlantic 144 MHz QSO made ! Between 04 and 05 October 2016 a new record was set. PY1MHZ Marcos received in the city o... Read more