Dual Rav 4 SM1000 Installation

Andy VK5AKH, and Mark VK5QI, have mirror image SM1000 mobile installations, same radio, even the same car! Some good lessons learned on testing and debugging microphone levels that will be useful for other people installing their SM1000. Read all about it on Mark’s fine blog.

Codec 2 Masking Model Part 1

Many speech codecs use Linear Predictive Coding (LPC) to model the short term speech spectrum. For very low bit rate codecs, most of the bit rate is allocated to this information.

While working on the 700 bit/s version of Codec 2 I hit a few problems with LPC and started thinking about alternatives based on the . . . → Read More: Codec 2 Masking Model Part 1

A Miserable Debt Free Life Part 2

The first post was very popular, and sparked debate all over the Internet. I’ve read many of the discussions, and would like to add a few points.

Firstly I don’t feel I did a very good job of building my assets – plenty of my friends have done much better in terms of net worth and/or . . . → Read More: A Miserable Debt Free Life Part 2

Hamburgers versus Oncology

On a similar, but slightly lighter note, this blog was pointed out to me. The subject is high (saturated) fat versus carbohydrate based diets, which is an ongoing area of research, and may (may) be useful in managing diabetes. This gentleman is a citizen scientist (and engineer no less) like myself. Cool. I . . . → Read More: Hamburgers versus Oncology

Is Alt-Med Responsible for 20% of Cancer Deaths?

In my meanderings on the InterWebs this caught my eye:

As a director of a cancer charity I work with patients everyday; my co-director has 40-yrs experience at the cancer coalface.We’re aware there are many cancer deaths that can be prevented if we could reduce the number of patients delaying or abandoning conventional treatment while experimenting with . . . → Read More: Is Alt-Med Responsible for 20% of Cancer Deaths?

OLPC and Measuring if Technology Helps

I have a penchant for dating teachers who have worked in Australia’s 3rd world. This has given me a deep, personal appreciation of just how hard developing world education can be.

So I was wondering where the OLPC project had gone. And in particular, has it helped people? I have had some experience with . . . → Read More: OLPC and Measuring if Technology Helps

A Miserable Debt Free Life

I have a lifestyle that is different to many people, and I have been encouraged to write about it. According to my friends, I am “living the dream”. I get up in the morning and can choose to do anything I want. I don’t work for money any more. I’ve been able . . . → Read More: A Miserable Debt Free Life

FreeDV Robustness Part 7 – FreeDV 700B

For the last few weeks I’ve been working on improving the quality of the 700 bit/s Codec 2 mode. It’s been back to “research and disappointment” however I’m making progress, even uncovering some mysteries that have eluded me for some time.

I’ve just checked in a “FreeDV 700B” mode, and ported it to the FreeDV API . . . → Read More: FreeDV Robustness Part 7 – FreeDV 700B

Advanced VHF Digital Radio using Codec 2

Justin, VK7TW, has published a video of my recent presentation at Gippstech, which was held in July 2015. Good summary of FreeDV, the SM1000, and the exciting possibilities for VHF Digital Voice. Thanks Justin! Here are the Open Office slides of the presentation.

Oh, yes and in the cut out image below my head doesn’t really . . . → Read More: Advanced VHF Digital Radio using Codec 2

FreeDV QSO Party Weekend – September 12/13th

My good friends at the Amateur Radio Experimenters Group (AREG), an Adelaide based Ham radio club, have organised a special FreeDV QSO Party Weekend on Sat/Sun September 12/13th. This is a great chance to try out FreeDV, work VK5 using open source HF digital voice, and even talk to me!

All the details including paths, frequencies, . . . → Read More: FreeDV QSO Party Weekend – September 12/13th