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Building the Minima 
An Arduino based HF Transceiver 
Thomas - KK6AHT 
Pacificon 2014
Licensed in 2012 at Pacificon 
Extra license with K6BJ classes in Dec 2012
Farhan aka VU2ESE 
Author of the BITX20
The Minima 
Announced on January 16th 2014
General coverage HF Receiver 0 to 30 Mhz 
CW and SSB operation 
Power output 5 watts (w/ amplifier) 
LCD Display - Arduino...
Arduino - LCD Display 
Si570 XO (VFO+20Mhz) 
CQ CQ … 
14.285 
KISS Mixer 
Crystal Filter 
20 Mhz 
RX 
Pre-amp 
BFO 
20 Mhz...
Arduino - LCD 
Display 
Si570 XO (VFO 
+20Mhz) 
KISS 
Mixer 
Crystal Filter 
20 Mhz 
RX 
Pre-amp 
BFO 
20 Mhz Diode 
Mixer...
Arduino - LCD Display 
Si570 XO (VFO+20Mhz) 
KISS Mixer 
Crystal Filter 
20 Mhz 
TX 
Pre-amp 
BFO 
20 Mhz 
Diode 
Mixer 
M...
Arduino - LCD 
Display 
LPFs 
Si570 XO (VFO 
+20Mhz) 
KISS 
Mixer 
Crystal Filter 
20 Mhz 
RX 
Pre-amp 
BFO 
20 Mhz Diode ...
Homebrewing the 
Minima
Measuring the crystal filter
Measuring the crystal filter 
• Converting Voltage into Power? 
• Impedance of my signal generator? 
• Impedance conversio...
Measuring the crystal filter
Reminds me of the roman army in the Asterix and the Roman Agent.! 
- f
Toroids … 
• Do not be afraid 
• Get a LCR meter (AADE - $100) 
• Watch YouTube videos 
• Get multi color magnetic wires f...
Home made Arduino
Home made Arduino 
• Get a Atmega328P with an Arduino bootloader 
• Or better, burn the bootloader yourself 
• Enjoy the b...
Arduino - LCD 
Display 
Si570 XO (VFO 
+20Mhz) 
KISS 
Mixer 
Crystal Filter 
20 Mhz 
RX 
Pre-amp 
BFO 
20 Mhz Diode 
Mixer...
Receiving signals 
• It is a lot easier than you think! 
• Learnt how to debug amplifiers via transistor 
biases, temperat...
Finishing up 
• Mixer fun: Carrier Suppression, Conversion Loss 
and IIP3 
• Output power, Harmonics and the FCC 
• From 5...
Lessons learnt
Blocks 
• Learnt to see a circuit as blocks and stages 
• Everything can be tested and measured independently 
• Build, Te...
Tools 
• DVM, Scope 
• Soldering Iron, MePads, Glue 
• LCR Meter 
• Some sort of signal generator 
• BNC Connectors, 50 Oh...
Reference 
• Minima Initial Article 
http://www.phonestack.com/farhan/minima.html 
• Minima Mailing List 
• And all the Mi...
Solder Smoke 
Bill Meara - N2CQR 
Book 
Blog 
Podcast!! 
http://soldersmoke.blogspot.com
Closing Remarks
Project Status 
• Still actively being developed and designed 
• The KISS Mixer will probably be replaced by 
another mixe...
Open Source Software 
• Many contributions to the Minima software 
https://github.com/afarhan/radiono 
• WA0UWH leading th...
Join the club! 
Already 4 known Minimas in the 
bay area. 
! 
! 
Questions? Demo!! 
! 
! 
Thomas - KK6AHT 
http://sarfata....
Building the Minima - Pacificon 2014
Building the Minima - Pacificon 2014
Building the Minima - Pacificon 2014
Building the Minima - Pacificon 2014
Building the Minima - Pacificon 2014
Building the Minima - Pacificon 2014
Building the Minima - Pacificon 2014
Building the Minima - Pacificon 2014
Building the Minima - Pacificon 2014
Building the Minima - Pacificon 2014
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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/

Published in: Technology
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Building the Minima - Pacificon 2014

  1. 1. Building the Minima An Arduino based HF Transceiver Thomas - KK6AHT Pacificon 2014
  2. 2. Licensed in 2012 at Pacificon Extra license with K6BJ classes in Dec 2012
  3. 3. Farhan aka VU2ESE Author of the BITX20
  4. 4. The Minima Announced on January 16th 2014
  5. 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
  6. 6. 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 …
  7. 7. 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
  8. 8. 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
  9. 9. 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
  10. 10. Homebrewing the Minima
  11. 11. Measuring the crystal filter
  12. 12. Measuring the crystal filter • Converting Voltage into Power? • Impedance of my signal generator? • Impedance conversion? • Termination?
  13. 13. Measuring the crystal filter
  14. 14. Reminds me of the roman army in the Asterix and the Roman Agent.! - f
  15. 15. Toroids … • Do not be afraid • Get a LCR meter (AADE - $100) • Watch YouTube videos • Get multi color magnetic wires for transformers
  16. 16. Home made Arduino
  17. 17. 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
  18. 18. 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
  19. 19. 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
  20. 20. Finishing up • Mixer fun: Carrier Suppression, Conversion Loss and IIP3 • Output power, Harmonics and the FCC • From 50mV to 50V
  21. 21. Lessons learnt
  22. 22. 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
  23. 23. 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
  24. 24. 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)
  25. 25. Solder Smoke Bill Meara - N2CQR Book Blog Podcast!! http://soldersmoke.blogspot.com
  26. 26. Closing Remarks
  27. 27. 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)
  28. 28. 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
  29. 29. 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.

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