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
Here are all the links- http://goo.gl/FgPgwH You asked for it! Well, one of you did. In this video we take the Midland Micro Mobile GMRS radio... Read more
Eric from Universal Radio discusses the important update to the Yaesu FT-991, the new Yaesu FT-991A model. This model includes a live waterfall while... Read more
18 elements ~ 52ft boom ~ Amazing! WA3FET has done it again! The aptly named DX Glider is the Ultimate Triband Yagi. No compromise monoband pe... Read more
RQ-84 – The classic “Quad” full-size has ten elements for 10m, eight – 15 m, six – 20 m, and four full-size elements on 40m band
RQ-84 – the classic “Quad” full-size has ten elements for 10m, eight – 15 m, six – 20 m, and four full-size elements on... Read more
The winner of the July 2015 QST Cover Plaque award is Steve Lawrence, WB6RSE, for his article “Rebuilding a Receiving Flag Antenna for 160 Meters.” Th... Read more
Dayton Hamvention 2015 Award Nominations Due by January 16, 2015! Read Full Article in ARRL.org: Read more
The January issue of Digital QST is now available! If you are an ARRL member, you can start reading at http://www.nxtbook.com/nxtbooks/arrl/qst... Read more
“The Enforcement Bureau (Bureau) of the Federal Communications Commission has entered into a Consent Decree to resolve its investigation into wh... Read more
Anytone TERMN-8R THE FIRST RADIO FOR AMATEUR, COMMERCIAL, AND PUBLIC USEThe most versatile two way radio on the market, certified for use for commerci... Read more
Radioddity GD-55 Plus UHF 400-480MHz Waterproof DMR Digital Radio,10W with 2800mAh Battery Mototrbo Dual Time Slot (Tier I&II)
Brief introduction for Radioddity GD-55 Plus, A Practical DMR GD-55 Plus Differentiating Factors 10W High Power IP-67 Waterproofed Mototrbo Tie... Read more