Take This Job for 1 April 2025

No joke!

“Take This Job”
1 April 2025

Interested in Open Source software and hardware? Not sure how to get started? Here’s some places to begin at Open Research Institute. If you would like to take on one of these tasks, please write hello at openresearch dot institute and let us know which one. We will onboard you onto the team and get you started.

“help wanted for open source digital radio work at ORI”

Opulent Voice:

Add a carrier sync lock detector in VHDL. After the receiver has successfully synchronized to the carrier, a signal needs to be presented to the application layer that indicates success. Work output is tested VHDL code. 

Bit Error Rate (BER) waterfall curves for Additive White Gaussian Noise (AWGN) channel.

Bit Error Rate (BER) waterfall curves for Doppler shift.

Bit Error Rate (BER) waterfall curves for other channels and impairments.

Review Proportional-Integral Gain design document and provide feedback for improvement. 

Generate and write a pull request to include a Numerically Controlled Oscillator (NCO) design document for the repository located at https://github.com/OpenResearchInstitute/nco. 

Generate and write a pull request to include a Pseudo Random Binary Sequence (PRBS) design document for the repository located at https://github.com/OpenResearchInstitute/prbs.

Generate and write a pull request to include a Minimum Shift Keying (MSK) Demodulator design document for the repository located at https://github.com/OpenResearchInstitute/msk_demodulator 

Generate and write a pull request to include a Minimum Shift Keying (MSK) Modulator design document for the repository located at https://github.com/OpenResearchInstitute/msk_modulator

Evaluate loop stability with unscrambled data sequences of zeros or ones.

Determine and implement Eb/N0/SNR/EVM measurement. Work product is tested VHDL code.

Review implementation of Tx I/Q outputs to support mirror image cancellation at RF. 

Haifuraiya:

HTML5 radio interface requirements, specifications, and prototype. This is the user interface for the satellite downlink, which is DVB-S2/X and contains all of the uplink Opulent Voice channel data. Using HTML5 allows any device with a browser and enough processor to provide a useful user interface. What should that interface look like? What functions should be prioritized and provided? A paper and/or slide presentation would be the work product of this project. 

Default digital downlink requirements and specifications. This specifies what is transmitted on the downlink when no user data is present. Think of this as a modern test pattern, to help operators set up their stations quickly and efficiently. The data might rotate through all the modulation and coding, transmititng a short loop of known data. This would allow a receiver to calibrate their receiver performance against the modulation and coding signal to noise ratio (SNR) slope. A paper and/or slide presentation would be the work product of this project.

FCC Filing for 219 MHz Rules Changes from ORI

Thank you to the many people that have helped with this effort. Open Research Institute (ORI) has filed the first of what might be several comments and proposed rules making efforts to the FCC about reforming amateur radio use of the 219 MHz band.

https://www.fcc.gov/ecfs/search/search-filings/filing/10329271641887

The list of folks that have contributed and supported this effort to renovate 219 MHz for actual amateur radio use is quite long. This filing and any that follow are the result of over a year of work. Thank you especially to Mike McGinty, ARRL advisors, and Justin Overfelt. 

If you would like to help? 

1) Please use this comment to make your own similar request under this particular proceeding. This is a “what regulations do you want to delete?” type of call. As with many FCC calls for comment, it will be dominated by commercial interests. Anything from amateur radio will stand out. The deadline for comments is 11 April 2025. Speak simply and directly. We’d like to use this band without unnecessary and burdensome requirements. 

2) Please be ready to file a “reply” comment after the 11 April 2025 deadline. This is a chance for you to say “I agree with this and support this.”

We are not asking to change the fundamental nature of the band. Fixed digital messaging forwarding is super exciting these days because of SDRs, mesh networking, and all sorts of amazing protocol work available to us. We decided to simply ask for removal of the notification and permissions requirements. These requirements have resulted in zero use of this band for over two decades. 

The primary service back in the late 1990s when these rules came out was maritime (AMTS). Those licenses were never fully deployed and have now been leased out by railroads. This means, to us, that the permissions requirements now make no sense at all for secondary licensees. 

ORI is tired of this and is working to make this situation better. This is a great band with huge, innovative, digital promise. We deserve to have a seat at this table and that means the chair has to actually exist and the door to the room the table is located within has to actually be something we can open.