HamCation 2022

This post will be updated with information leading up to and throughout the event. Thank you to HamCation for the support and opportunity.

Tucson Amateur Packet Radio

Booth, prototypes, forum presentation, give-aways, and more!

Society of Amateur Radio Astronomers

Forum presentation.

M17 Project

Booth, forum presentations, give-aways, and more!

Open Research Institute

Booth, demonstration reports, give-aways, sales, and more!

ARRL Technology Track

Talk by Michelle Thompson W5NYV.

Abstract:

Digital communications technology is large interdisciplinary field that incorporates some of the most fundamental scientific advancements of the past 120 years.

From the first spark gap transmitters, to telegraph, to the transistor, to the fast fourier transform, to the tape drive, to telnet, to touchscreens and trace routes, trackballs and telecommunications of all sorts, digital transmission of everyday information has revolutionized the way we communicate with each other, the way we store data, and the way we process that data to create things of greater and greater value.

This talk is about how information travels over the air in ways relevant to motivated amateur radio enthusiasts.

Digital communications is a difficult subject. This talk is simplified, but definitely not dumbed down. You will leave this session with a greater intuitive understanding of how digital communications works.

There’s a vibrant community and growing body of work in open source amateur radio digital communications for space and terrestrial work. The talk will close with a brief summary of open source digital communications work at Open Research Institute, Inc., a 501(c)(3) dedicated to open source work for amateur radio and beyond.

Weekly Engineering Report 10 August 2021

Greetings all!

1) OpenRotor will have a Ham Expo workshop from 12:00pm – 2:00pm in the Chat. Direct link is: https://ori.whereby.com/open-research-institute

Get there by clicking “Chat” in the booth at Ham Expo. 

2) Planning spreadsheet for ORI at Ham Expo has been started and the editable version is linked in the Slack.

Please add yourself if you have something to present on any open source amateur radio or amateur radio satellite service subject. Coordinate through Slack. We have excellent resources and support from Ham Expo this year. The goal is to provide a low-stress enjoyable venue to speak with attendees about the things we do and the things we want to see succeed.

I need videos of demos or time commitments for live demos. Don’t be shy – your work is of great interest at the Expo. 

3) If you are not on our Slack, or haven’t visited lately, please do – this is where daily engineering and planning happens. 

https://phase4ground.slack.com/

If you need an invite, please send me a request directly. 

4) FPGA Standup meeting was today and the team will have a lot to show off at Ham Expo and for Google Skywater in October. Most recent recording of the weekly standup is:

5) DEFCON was a big success. We had our first in-person board meeting in nearly two years. A lot of networking and discussion and learning happened. There are several projects that we might want to consider supporting or assisting. More about those projects in the #defcon channel in Slack. 

6) ORI Store (https://stores.goldmedalideas.com/ori/shop/home) will have a promotion. We have a supply of the 2019 printed paper versions of the AMSAT Getting Started With Amateur Satellites Guide and will include one in every order over $30 starting at Ham Expo and lasting until supplies are gone. 

7) Open Lunar Foundation lab purchase is complete and the lease for storage of that equipment is being transferred from Open Lunar to ORI this week. The lab equipment will move to primarily M17 Lab on the East Coast and some will go to Remote Lab South in Arkansas this autumn. If you can help reduce shipping costs then get in touch.

8) FCC has agreed to meet with us and will arrange for both OET and the International Satellite Bureau to attend. The agenda is how open source can successfully address Debris Mitigation regulatory requirements for the amateur radio satellite service, and specific microwave band spectrum defense for the amateur radio satellite service. A summary of the content for this meeting will be presented at Ham Expo. There will be a breakout session and Q&A. 

9) Work session at Huntsville Space and Rocket Center for the Birdbath Big Dish renovation has been postponed due to covid. Originally scheduled for immediately following Huntsville Hamfest, the work session will happen when it’s safe to invite volunteers to work together on site. This project renovates a 20 foot dish for open source amateur and citizen space science use.

-Michelle W5NYV

Dual-Band Feeds Update

My background is baseband and algorithm development, but the RF side is where the signals meet and exceed the sky. I have only the deepest respect for those that are talented here and give generously of their time for amateur satellite project success. We owe so much to Kent Britain, Paul Wade, and many others.

There are two designs for Phase 4 dual band feeds in the repository linked here. They are dual-band feeds, best used in dishes.

https://github.com/phase4ground/documents/tree/master/Engineering/Antennas_and_Feeds

The first one I want to introduce you to is the 5 GHz up, 10 GHz down. This feed was designed by Paul Wade W1GHZ, has lab results, has been manufactured in amateur machine shops, and has been 3d printed/metallized. This feed was demonstrated at amateur and IEEE conferences.

The second is 10 GHz up, 24 GHz down. This feed is another design from Paul Wade W1GHZ. Preliminary lab results are in progress and published in the repository. More to come! ORI bought 15 of them and is interested in putting them into the hands of amateurs that will use them and report back. Three have been sent out so far, and we are looking to send out more.

While the baseline Phase 4 design is “five and dime”, the goal of ORI is to use any and all microwave bands that we can. I think we are all aware of how much pressure our microwave bands are under from commercial interests.

The system design is extensible to 10/24, so we needed a feed for this.

If you want to contribute or participate, then please visit

https://www.openresearch.institute/getting-started/

Thank you to all that have helped make this possible!

-Michelle W5NYV

26 March 2021 Engineering Report

Here is a visual walkthrough of the features on the TEBF0808 UltraITX+ Baseboard for Trenz Electronic TE080X UltraSOM+, presented by Paul KB5MU and Michelle W5NYV.

These stations are available to the community from Open Research Institute’s Remote Labs. We currently have two sets of gear and are procuring two more.

The Trenz platform allows for full access to the FPGA, power reduction work, and thermal modeling. All are extremely important for space applications.

We also have the Xilinx development board for the Ultrascale, for preliminary work.

The FPGA module goes in the lower left empty square with the high-density connectors.

The FPGA module has a heat sink, called a heatspreader, that is a machined metal plate. It attaches to the FPGA module with screws. However, it needs an intermediate layer to conduct the heat from the FPGA to the metal plate. The plate is designed to fit many different modules, and there’s a gap between the metal plate and the top of the components on the FPGA module.

This gap is usually filled with a specific gap-filling thermal paste.

Which happens to be out of stock, all over the world.

So, of the four stations we’re settting up, one will be fitted with a thermal adhesive film. This comes in sheets and can be cut to size. It can be used for space, so as we dial down the power consumption with code adjustments, we can measure the thermal results with something that is appropriate for the space mission.

The other three will get gap-filling goo directly from Trenz. This is the only way to preserve the warranty on these expensive modules, so it’s not a bad choice. And, this gives us something to compare the sheet against. We’ll test both in thermal modeling and chamber.

-Michelle W5NYV