www.shaneburrell.com BLOG Search – Rescue – Scuba – Diving – Telecom – Electronics – HAM Radio

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)

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

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.

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.

DRA818V Filter FullSizeRender

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3Mar/150

METCAL Models, Tips, n Tricks

If you are in the market for a soldering station you can't really go wrong with MetCal.  The are dependable and easy to repair should something happen.  Instant heating, well placed heat, and an easy to use hand piece are just a few of the reasons to use an inductive RF soldering station.  New stations have come down in price and units from Thermaltronics are compatible.

Big issues are if you haven't seen one or not generally "in the know", finding used units that are usable can be difficult.  First, to have a working, station you will need 3 main components.  Below is a list of recommendations about how to get everything together.  I'm sticking with the high end industrial models and not the smaller units.

Power Supply / RF Unit

RFG-30 - These are the oldest MetCal in this series.  Good units.  No auto-shutoff. Has one LED Light

PS2e-1  - These are the next version with Auto-Shutoff.  Please note that these were produced in 220V and 110V. You want a -1 or -01 unit for 110V. Has 2 LED Lights.

MX-500 - These are one release behind current.  They offer two outputs but you can only use one at a time.

Hand Piece

Any MX-500 Hand piece will work. MX-RM3E

Newer Metcal MX-H1-AV

Thermaltronics - SHP-1

Stand

You will want either the MetCal Stand or the Thermaltronics.  They have magnets built it to keep tip cooler when not in use.  SHH-1

 

 

 

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17Feb/150

KiCad Librarian on OSX MAC

Screenshot 2015-02-17 16.27.23This tool comes in handy for organizing kicad footprints and modules.  Unfortually it doesn't build on osx normally.   I have created a homebrew repo and after ignoring some build errors it seems to compile and work great on OSX.

The main site for the tool is at http://www.compuphase.com/electronics/kicadlibrarian_en.htm.

My homebrew repo is located at https://github.com/shaneburrell/homebrew-kicadlibrarian

 

17Feb/150

OpenSource HT Part 2.

Prototype boards for testing the RF module along with provisions for a low pass filter have been sent off for manufacture.  I'm expecting to see these back in a few weeks.  In the meantime below are links to the Gerbers for the test board as well as Kicad Modules for making your own boards that use the DRA818V module.

DRV818V Image

 

DRV818KICAD

DRV818ProtoBoard

13Feb/150

OpenSource HT Part 1.

I've been looking at migrating some of the work I've done on my ComboStar build to VHF/UHF including GSMK and Codec2.  With 3D printed case, lithium battery, STM32F405, DRA818V/U, and a nice OLED screen I think its possible to build a DIY 1 Watt radio that support analog, FSK (APRS), and Codec2 GSMK.  I already have several working STM32 projects with successfully generating various modulations including GMSK, POCSAG and AFSK.  My first step is to play with the DRV818V module and see how difficult it is to implement.  From the datasheet I've included a low pass filter in this prototype which I should be able to prototype with my existing STM project board.

SBDHT

15Jan/150

Yosemite Encryption Paused Issue Macbook Pro

After trying many of the suggestions online about fixing this issue I figured out the quickest way to recover.

1. Do a unencrypted Time Machine Backup

2. Goto recovery mode and completely format the startup drive and set for normal (non encrypted) journaled file system.

3. Restore backup

Thats it the quickest way to resolve the issue without completely reinstalling.

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6Mar/140

First Release of Rescue Calculator

https://itunes.apple.com/us/app/rescuecalculator/id829130203?ls=1&mt=8

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