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
“Remote Antenna Tuners” is the topic of the just-released episode of the “ARRL The Doctor is In” podcast. Listen…and learn! Read more
SNR – Signal-to-Noise Ratio From the 2018 TAPR Digital Communications Conference, we learn about a true measurement of signal to noise ratio on... Read more
“We’re setting up for Winter Field Day and testing out the Chameleon Emcomm III Portable HF Antenna.” CHAMELEON ANTENNA EMCOMM-III P... Read more
Full 20m, 15m and 10m Band Coverage (with Feed Point Mounted ATU) Under 8 Feet Tall! No Radials! Force 12’s Sigma Series Verticals are contest a... Read more
So, do you think Nikola Tesla’s wireless energy system could have worked? Find out in this video! Read more
The ANAN-8000DLE HF & 6M 200W SDR Transceiver meets and exceeds the requirements of even the most discerning Amateur Radio Operator, it is based o... Read more
Microwave Update (MUD) 2017 has issued a call for papers and presentations on the technical and operational aspects of microwave Amateur Radio communi... Read more
The AR685 is fitted with a high-quality aluminum metal frame and still weighs only 310g. The lithium-ion battery with 1500mAh allows at least 16 ho... Read more
YAESU DR-2X Features Easy Migration…. The repeater controller, receiver and transmitter are all packaged into a 19” standard cabinet rack mount panel... Read more