Building the Minima - Pacificon 2014
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This is a presentation I did at the Pacificon HAM Radio Convention in October 2014. In this presentation I introduce and describe the Minima HAM Radio transceiver and relate my experience building this radio. An audio recording and a handout are available on my blog: http://sarfata.org/2014/10/Minima-Presentation-at-Pacificon/
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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 2012 at Pacificon Extra license with K6BJ classes in Dec 2012
- 3. Farhan aka VU2ESE Author of the BITX20
- 4. The Minima Announced on January 16th 2014
- 5. General coverage HF Receiver 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 - LCD Display 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 - LCD Display 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
- 14. Measuring the crystal filter
- 15. Measuring the crystal filter • Converting Voltage into Power? • Impedance of my signal generator? • Impedance conversion? • Termination?
- 16. Measuring the crystal filter
- 18. Reminds me of the 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
- 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. Lessons learnt
- 32. Blocks • Learnt to 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 • Minima Initial 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 Bill Meara - N2CQR Book Blog Podcast!! http://soldersmoke.blogspot.com
- 36. Closing Remarks
- 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.