www.shaneburrell.com Telecom – Electronics – HAM Radio – Test Equipment – Rescue

4Dec/160

RZR Mini Multiplexing Part 2

RZR Mini Multiplexing Part 1. This is a multipart series of design, prototype and build of a small multiplexing system for UTV's. Initially this will replace lighting and winch relays with solid state control.

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3Dec/160

RZR Mini Multiplexing Part 1

RZR Mini Multiplexing Part 1. This is a multipart series of design, prototype and build of a small multiplexing system for UTV's. Initially this will replace lighting and winch relays with solid state control.

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Filed under: Electronics, KiCad No Comments
11Aug/160

KICAD OSX Package with NGSPICE Simulator Enable.

I put this together for testing.  Package download is below (At Very BOTTOM).  You will need to homebrew a non-standard ngspice (doesn't have ngspice lib by default).  Its avail here https://raw.githubusercontent.com/jmaibaum/homebrew-core/8ac02ae933c4cd5d1f661b6a2bda2f429d5f1e87/Formula/ngspice.rb . Note the NGSpice homebrew is in flux and this version is done jmaibaum.

KiCAD NGSPICE Sim

KiCAD NGSPICE Sim

KICAD OSX BUILD 7018

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8Aug/150

What’s Next in Ham Radio Rant

Just a quick video of what's next in Ham radio and some projects I've been working on, as well as others, to get there.  Some highlights:

What's Next...

  • MultiCodec - Codec2, AMBE...
  • Remote Standardized Head Unit / Retrofit
  • Less PC .. More Embedded
  • More modular
    • Easier to use and the possibility of installing station away from Radio.
  • DSP development in the hands of more people.
  • Older Designs get updates.
  • Powerful Tools getting more accessible
    • KiCad (New stable, RF Traces (Curved), Diff Pair Routing (USB, etc))
    • Inexpensive STM32 and other DSP platforms
    • Filter Creation and Simulation

Details

An open source codec for compression is up and going (CODEC2).

AMBE is much easier to implement and get ahold of.

Remote heads are beginning to pop up commercially in the FlexRadio line.

More embedded projects/products including SM1000, FlexRadio head unit, and many many DStar node adaptors.

DMR radios have hit the market to warm up the digital voice market, many which are under $300 new.

Video

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30Jul/151

Experimental KICAD Build OSX 10.11 with menu icons.

This is an experimental build of KICAD using slightly modified build script Adam Wolf wrote.  This was built on 10.11 and eeschema still isn't updating the canvas as of Beta 5.  I've also enabled menu icons just to refresh my memory on what that looks like.

KICAD

KICAD EXTRAS

Screenshot 2015-07-24 10.47.57

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1Jul/150

ComboStar HomeBrew Since 2012…. What is next?

I built my first combostar/picastar back in 2012.  I've made several modifications over the past three years including adding a STM32 based embedded board to do FreeDV.  Many of the parts were difficult to get and even more so now.  I learned so much from its construction and the wealth of information from the homebrew group that I'd really like to see an update or maybe something entirely new.  The DSP used is very old in the design, the TFT controller parts are dated some aren't made anymore.  Here is the short list of reasons to update or come up with a new design for a homebrew HF rig.

  • There are better parts for the GUI out.  Integrated graphics STM32F4 would be a great upgrade.  Maybe multiple screens and small OLEDs have come way down in price for adding addtional controls at low cost and ease of use.
  • The DSP could be replaced with a STM32 series ARM keeping it all on the same platform.
  • There are already improvements to the H Mode Mixer and maybe a direct conversion would possible now with some of the low cost TI frontends and low power/cost FPGA.
  • Codec2 is widely availible and there is no reason not to include not only this digital mode but a hardware platform that may run future digital modes.
  • Modularization of the GUI, RF sections etc.  I really like the idea of mounting the radio somewhere and the GUI/MIC elsewhere.  I would also like to see VHF/UHF modules that utilize all the work done on digital modes/GUI keeping the idea of a remote/even distributed GUI Head.

 

 

 

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24Mar/150

SBHT Sent to Fab. Parts ordered.

The long wait begins...  The first SBHT Prototypes have went to fab and parts have been ordered. There are a lot of untested sections in this design so build up of the first rev boards will be slow.

Messages Image(1934004286)

Messages Image(1798842402)

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22Mar/150

SBHT – Rough Layout Finished .

FullSizeRender 3 FullSizeRender 4 FullSizeRender 5Screen Shot 2015-03-22 at 2.48.22 PM Screen Shot 2015-03-22 at 2.48.02 PM

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18Mar/150

SBHT – Codec 2, TDMA, All Digital VHF Transceiver.

Just a sneek peak at what I've been slowing working on for the past few years.  After building a number of test sub assemblies, filter testing, device selection flops, and lots of hours I've started routing the first prototype of a VHF Transceiver capable of TDMA operation at decent wattage.

Screenshot 2015-03-18 15.34.08

 

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10Mar/150

DRA818V + Minicircuits Low Pass Filter.

The DRA818V

I wanted something small and almost disposable for APRS tracking.  The DRA818V fits the bill but needs low pass filtering.   Some photos of the prototype boards and output floor while TX outside intended band.  The SMD filter works great, inexpensive, and makes for a nice package.  I used a Mini-Circuits LFCN-160+.  The DRA818V can be found on Ebay.  OshPark manufactured boards I designed in KiCad.

DRA818V Filter

Prototypes

FullSizeRender

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