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Building the Minima - Pacificon 2014
The document discusses the Minima, an Arduino-based HF transceiver capable of operating from 0 to 30 MHz with a power output of 5 watts, designed by Thomas KK6AHT and announced in January 2014. It includes details on the hardware components, design considerations, and homebrewing tips for enthusiasts, emphasizing the experience of building and testing stages of the transceiver. The project is still under development, with open-source software contributions and resources provided for further learning and collaboration.
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Building the Minima - Pacificon 2014
- 1. Building the Minima An Arduino based HF Transceiver Thomas - KK6AHT Pacificon 2014
- 2. Licensed in 2012at Pacificon Extra license with K6BJ classes in Dec 2012
- 3. Farhan aka VU2ESE Author of the BITX20
- 4. The Minima Announcedon January 16th 2014
- 5. General coverage HFReceiver 0 to 30 Mhz CW and SSB operation Power output 5 watts (w/ amplifier) LCD Display - Arduino controlled Open Source Code RIT and two VFOs Super Heterodyne with IF at 20 Mhz Cost under $100
- 7. Arduino - LCDDisplay Si570 XO (VFO+20Mhz) CQ CQ … 14.285 KISS Mixer Crystal Filter 20 Mhz RX Pre-amp BFO 20 Mhz Diode Mixer AF Pre-amp AF Amp 34.285 CQ CQ … 20 Mhz CQ CQ … 20 Mhz CQ CQ …
- 8. Arduino - LCD Display Si570 XO (VFO +20Mhz) KISS Mixer Crystal Filter 20 Mhz RX Pre-amp BFO 20 Mhz Diode Mixer AF Pre-amp AF Amp
- 9. Arduino - LCDDisplay Si570 XO (VFO+20Mhz) KISS Mixer Crystal Filter 20 Mhz TX Pre-amp BFO 20 Mhz Diode Mixer Mic Amp 34.285 CQ CQ … 20 Mhz CQ CQ … 14.285 CQ CQ … 20 Mhz CQ CQ … LPFs
- 10. Arduino - LCD Display LPFs Si570 XO (VFO +20Mhz) KISS Mixer Crystal Filter 20 Mhz RX Pre-amp BFO 20 Mhz Diode Mixer AF Pre-amp AF Amp Mic Amp TX Pre-amp CW Tone TX / RX Serial Port
- 11.
- 14. Measuring the crystalfilter
- 15. Measuring the crystalfilter • Converting Voltage into Power? • Impedance of my signal generator? • Impedance conversion? • Termination?
- 16. Measuring the crystalfilter
- 18. Reminds me ofthe roman army in the Asterix and the Roman Agent.! - f
- 19. Toroids … •Do not be afraid • Get a LCR meter (AADE - $100) • Watch YouTube videos • Get multi color magnetic wires for transformers
- 21.
- 22. Home made Arduino • Get a Atmega328P with an Arduino bootloader • Or better, burn the bootloader yourself • Enjoy the binary (works / does not work) aspects of the controller board ;) • If you are not familiar with Arduino, stick to the standard setup for now
- 23. Arduino - LCD Display Si570 XO (VFO +20Mhz) KISS Mixer Crystal Filter 20 Mhz RX Pre-amp BFO 20 Mhz Diode Mixer AF Pre-amp AF Amp
- 27. Receiving signals •It is a lot easier than you think! • Learnt how to debug amplifiers via transistor biases, temperature and AC-coupled measurements • Built my first VXO and generating sine waves at 20 Mhz
- 29. Finishing up •Mixer fun: Carrier Suppression, Conversion Loss and IIP3 • Output power, Harmonics and the FCC • From 50mV to 50V
- 31.
- 32. Blocks • Learntto see a circuit as blocks and stages • Everything can be tested and measured independently • Build, Test, Move on - Each stage is a project • Keep a notebook - Take lots of notes
- 33. Tools • DVM,Scope • Soldering Iron, MePads, Glue • LCR Meter • Some sort of signal generator • BNC Connectors, 50 Ohm termination, Cables, etc • Spectrum Analyzer or PHSNA is nice to have
- 34. Reference • MinimaInitial Article http://www.phonestack.com/farhan/minima.html • Minima Mailing List • And all the Minimas that have been built! • Experimental Methods in RF Design (EMRFD) • ARRL Handbook • Chat With The Designer Podcast (cwtd.org)
- 35. Solder Smoke BillMeara - N2CQR Book Blog Podcast!! http://soldersmoke.blogspot.com
- 36.
- 37. Project Status •Still actively being developed and designed • The KISS Mixer will probably be replaced by another mixer in the future • This should not stop you! ! • A few PCBs were made but distribution is limited until the design is finalized ! • You will need the RF386 Power Amplifier (or similar)
- 38. Open Source Software • Many contributions to the Minima software https://github.com/afarhan/radiono • WA0UWH leading the charge with WSPR support, CW ID, Rotary encoder, etc https://github.com/wa0uwh/radiono_erb
- 39. Join the club! Already 4 known Minimas in the bay area. ! ! Questions? Demo!! ! ! Thomas - KK6AHT http://sarfata.org/ham/minima @sarfata This presentation is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.