SM1000 Part 13 – Shipping!

The enclosure has arrived from the new manufacturer! Edwin and team at Dragino are now assembling, testing, and shipping the first batch of 100 SM1000s. We plan to ship all Aliexpress pre-orders in week starting 3 May, Australian orders the week starting 10 May.

We have sold almost all of the first batch just in pre-orders! Rick and Edwin have already started work on the next batch of 100, making some small changes to help production.

It is remarkable just how long the “little details” take to work out when putting a product into production. I had the prototype SM1000 working in September, and the first revision of the case was ready before Christmas. Things always take longer than you expect. Oh well, we have made it in the end. We are shipping about 14 months after Rick and I started work on the project, which is not bad for any product I guess. Thanks so much Rick and Edwin!

SM1000 Support

For SM1000 support please post to the Codec 2 mailing list, that way we can all share the information. We’ll publish some SM1000 user guide information over the next few weeks. Maybe a wiki, so you can all join in. I really want this to be a community project.

FreeDV News

In other FreeDV news I’ve been working hard on a new “negative SNR” FreeDV mode that will find it’s way into the SM1000 and other FreeDV platforms later this year. So far I’ve developed a prototype 650 bit/s version of Codec 2 and Octave/C versions of a new coherent PSK HF modem with frequency diversity which greatly helps HF fading channel performance. I am currently being frustrated by HF modem frequency offset estimation (yet again!) but I’ll get there eventually. Other parts of the new coherent PSK HF modem are working really well.

In the VHF space, Brady KC9TPA, has been working hard on a design and PCB layout for a prototype VHF radio that can run FreeDV and demonstrate our advanced new ideas for VHF Digital Voice. Wish I was building radios too but I’m knee deep in DSP code!

Dayton 2015

Rick will be attending the Dayton Hamfest and presenting a talk on the SM1000, and will have a bunch of SM1000s for you to play with. Mel, Bruce and team will have a booth at Dayton with FreeDV and the SM1000 on display – thanks guys for all your efforts and kind support.

Minimalist VHF Software Defined Radio Part 2

Shortly after I published the first post on a simple VHF SDR, Brady KC9TPA started making suggestions about optimising the code. So I encouraged him to have a look into the transmit side. How can we take a baseband modem signal (like GMSK) and convert it up to a HF IF frequency like 10.7 . . . → Read More: Minimalist VHF Software Defined Radio Part 2

SM1000 Part 12 – Testing in the US

Walter, K5WH has one of the 3 pre-beta SM1000 units. He writes:

Here’s a pic of the operations setup of the SM1000 on the air today from Houston Texas, into my HPSDR radio. With average Power down to 3 watts even. Made successful contacts to Mel-K0PFX and Gerry-N4DV. After working the audio levels a . . . → Read More: SM1000 Part 12 – Testing in the US

FreeDV and Codec 2 2015 Road Map

Last week I had a great chat with Gary Pearce KN4AG from Ham Radio Now:

Which brings me to my plans for 2015……..

2015 Open Digital Voice Road Map

I’m pretty excited about where Open Source Digital Radio is going in 2015. My goals for this year are:

A “sub zero” negative SNR FreeDV HF mode.
VHF FreeDV mode(s) that . . . → Read More: FreeDV and Codec 2 2015 Road Map

SM1000 Part 11 – Accepting Pre-orders!

The first batch of 100 SM1000s are being built in China right now and we estimate shipping will start in late March April. Due to popular demand I am accepting pre-orders right now!

Australian customers can buy directly from my Store, rest of the world please use the Aliexpress Store for direct shipping from . . . → Read More: SM1000 Part 11 – Accepting Pre-orders!

Minimalist VHF Software Defined Radio Part 1

I think the future of radio hardware is a piece of wire connected to a GPIO pin.

The rest of the radio will be “gcc compilable” free software running on commodity CPU horsepower. I spoke about this at length in my recent linux.conf.au 2015 talk.

For the last two weeks I’ve been developing a simple radio architecture . . . → Read More: Minimalist VHF Software Defined Radio Part 1

Codec 2 and GMSK over VHF Radio Part 1

In the previous post comparing GMSK modem algorithms, I had some results suggesting we can build a Codec 2 VHF “mode” that outperforms legacy analog FM by 10dB (that’s a factor of 10 in power). It seemed to good too be true. So for the past few weeks I’ve been working with Daniel, VA7DRM, to . . . → Read More: Codec 2 and GMSK over VHF Radio Part 1

SM1000 Part 10 – First Over the Air Tests

Last night I visited Matt, VK5ZM, with a SM1000 Beta. He configured the SM1000 to interface to his IC706 using the CN12 connector patch socket. This allowed an RJ45 cable from the SM1000 to connect to the RJ45 mic/audio connector on the IC706. A few level adjustments and he was using FreeDV to . . . → Read More: SM1000 Part 10 – First Over the Air Tests

GMSK Modem Simulation

Modems are an interface between theoretical physics and what can actually be built. The laws of physics set the limits of modem performance, and ultimately the amount of power you need for a certain bit error rate at a receiver. With the right algorithm, we can reach the limits of modem performance.

I think that’s kind . . . → Read More: GMSK Modem Simulation

FSK over FM

I’m interested in developing a VHF mode for FreeDV. One intriguing possibility is to connect a modem to legacy analog FM radios, which would allow them to be re-purposed for digital voice. One candidate is FSK at 1200 bit/s, which is often used over FM for APRS. This operates through FM radios using . . . → Read More: FSK over FM