Repository for recent Amateur Radio Projects

     Last upd:
             Machine recognition of hand-sent morse code
               two easy to build microcontroller projects.

    2016-03-20 New - added 2016-03-20
    To automatially tune a Magnetic Loop Antenna

    Latest updates:

    Updated "Operation Instructions and Notes".
    Updated "BOM and Building Instructions" , adding a detailed description of the Dual Antenna Changeover feature.

    Firmware version 3.06.  Further Kenwood / Flex bug fixes.
    Firmware version 3.05.  Kenwood / Flex bug fixes.
    Firmware version 3.04.  ICOM bug fixes.
    Firmware version 3.03 - capability to handle 3 additional transceivers added

    Project added 
             Power and SWR Meter with dual bargraphs, using 2x AD8307

             microwatts to kilowatts, accurate SWR at 1mW.


    A new version (rewrite) of the firmware, using the Arduino environment.  Arduino sketch, v. 0.90.

    Firmware v.0.75, yet another bug fix.  Thanks ON6ZG

    Firmware v.0.74, another bug fix, courtesy of M0KGV.

    Firmware v.0.73, bug fix.

    Firmware version 0.71, firmware bug cleanup.

    Firmware version 0.70:
    12 bit ADC option added.  
    Some tweaks of USB commands
    New and more stable USB-Serial stack

    Major rewrite of description.  

    Project added 2013-09-29
    Magnetic transmitting loop antenna excercises
            Two magnetic transmitting loop antenna projects:

      • 0.5 x 0.5m loop using a manual stepper motor controller for tuning
      • 1 x 1m loop and an automatic microcontroller based stepper motor controller



    Automatic Controller and firmware now outdated.
    See the more recent project: 
    To automatically tune a Magnetic Loop Antenna

    Rough description of two magloop projects, including a manual and a fully automatic controller for tuning of magnetic loop transmitting antennas.

    A very simple to build, menu driven RF Power Meter, based on the AD8307 log amp
    (This project is also described in QEX Magazine, May/June 2013 Edition)

    nanowatts to kilowatts, dBm, volts over 50 ohm – 
    1, 2.5 or 5 second peak envelope power –
    average power and amplitude modulation index  –
    in-line (using a power tap) or terminated metering


    New firmware uploaded.

    V 1.08, modifications/Improvements to USB
    serial handling, 
    in sync with the project:
    Power and SWR Meter with bargraphs

    v 1.07, minor update, better average measurements.

    v 1.06 Added USB (virtual serial) commands

    Project added 2012-06-27
    AD8317 based Intelligent Attenuator/Power Meter for 0.2 to 500 MHz

    A multipurpose RF lab instrument:
    1. RF power meter, 0.2 to 500MHz, input power -50 to +30dBm, 0.1dB resolution.
    2. Step Attenuator, 0 - 151.5dB in 0.5dB steps.
    3. "Intelligent Attenuator" or "Signal Level Generator" function, automatically adjusting to a preset output power.


    Bugfixes and new features
    (Bargraph Power Display)

    SDR Widget

    A group project to develop the ideal sound card/controller for an SDR


    A full fledged sound card with superior performance, and Mobo style SDR control functions.  HiFi Audio playback variants also developed.  Development continues
    Comparison of “conventional”, “DDC based” and “soundcard based” receivers

    A rambling mini thesis on SDR performance

    Mobo 4.3 Application Programming Interface (API)

    Here is the Mobo 4.3 Firmware API, as well as the complete AT90USB162 / ATmega32U2 sourcecode for download (see bottom of page).

    The MoboControl GUI is available for download at the bottom of this page.


    API and repository for the  Mobo 4.3 firmware
    Now including the new version 1.07

    Mobo 4.3 Project - The continuing Saga of the SR 6.3 kit  - Now becoming a deluxe HF Transceiver

    This section includes description of a firmware development project, using the AT90USB162 microcontroller to provide Si570, and TRX control (automatic BPF + LPF switching, PA bias, SWR measurement and protect, etc...)


    References to Firmware version 1.07 added
    Softrock 6.3 Project - An all band HF Transceiver, based on the Softrock RXTX v6.3 kit

    Including the following home brew projects:

    Stable since 2009-09.

    Latest update:
    Added a picture from Alex, RN6LW, showing his very nice SDR transceiver, including the ATmega168 controller
    Yaesu FT-2000 Panadapter, using the Softrock 9 Lite, SDR receiver kit



    A 4m tall, bottomfed, electrically fullsize halfwave vertical dipole for 20m (tuneable to other bands)




Here is my own version of a disclaimer:
This is an Amateur Radio Techno Blog site. Everything on these webpages has been put here for my own benefit and enjoyment.  If I happen to have included an inappropriate link, please notify me, lofturj (-at-) gmail (-dot-) com, and it will be promptly deleted.  No responsibility whatsoever is taken for any material published on these webpages.  Some projects described here may include an element of original thought, now this is unlikely but statistically possible, remember the monkeys and the typewriters.  In such a wildly unlikely event, while I claim ownership, I also expressly grant  license to use on a non-profit basis.  To stretch this to the extremely silly; if anyone becomes filthy rich by implementing something based on an original thought found on this web page, then I want a 50% cut.  So there.
This site is not set up to be esthetically beautiful.  In fact, perverse pride is taken in its haphazard construction and top-heavy graphics.  Project descriptions may and will appear and disappear without rhyme or reason.

(Page last updated 2016-05-27, Loftur E. Jonasson, TF3LJ / VE2LJX)

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