SlideShare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you continue browsing the site, you agree to the use of cookies on this website. See our User Agreement and Privacy Policy.
SlideShare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you continue browsing the site, you agree to the use of cookies on this website. See our Privacy Policy and User Agreement for details.
Successfully reported this slideshow.
Activate your 14 day free trial to unlock unlimited reading.
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/
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/
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
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
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.
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.
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.
Finishing up
• Mixer fun: Carrier Suppression, Conversion Loss
and IIP3
• Output power, Harmonics and the FCC
• From 50mV to 50V
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.
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.
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.
Solder Smoke
Bill Meara - N2CQR
Book
Blog
Podcast!!
http://soldersmoke.blogspot.com
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.
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.
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.