About
Ribbit is an OFDM modem specification for multi-media communication over radio created by the Open Research Institute.
https://www.ribbitradio.org
Applications
Ribbit: Web-app (online only)
- ribbit.nz/app (Christchurch, NZ hosted)
- badkangaroo.github.io (hosted overseas on GitHub)
- Github source code (for offline use or self-hosting)
Rattlegram: recommended SMS app (works offline)
- Google Play Store for Android
- App Store for iPhone
- GitHub source code
Assempix and Shredpix: for sending/receiving pictures (works offline)
rattlegram-cli: for hackers and nerds only
- GitHub source code
rattlegram-desktop: Cross platform (Windows, Mac & Linux) Python/Qt GUI
- Coming soon (WIP)
rattlegram-repeater: store-and-forward repeater Linux BASH script
- Coming soon (WIP)
ribbit-ip: Linux TUN driver (experimental, IPv6 only)
- GitHub source code
Band Plan
General Amateur Operator's Certificate (GAOC) required for the 'ham' bands.
Frequencies and channels are recommendations only, as there is currently no formalized Ribbit band-plan. Operators must comply with the New Zealand General User Radio License (GURL) at all times, in particular observing the EIRP limits noted below.
| Band | Channel | Frequency MHz | Mode | GAOC Required |
|---|---|---|---|---|
| PRS | 22[6] | 476.950 | NFM | No[1] |
| PRS | 23[6] | 476.975 | NFM | No[1] |
| 11m | 24 | 27.245 | USB | No[2] |
| 70cm | 20[5] | 432.320 | NFM | Yes |
| 2m | 21[5] | 144.210 | NFM | Yes |
| 30m | 25[5] | 10.140 | USB | Yes[3] |
| 60m | 26[5] | 5.354 | USB | Yes[4] |
| 20m | N/A | 14.070- 14.347 | USB | Yes |
| 40m | N/A | 7.030- 7.197 | USB | Yes |
| 80m | N/A | 3.550- 3.897 | USB | Yes |
- Narrow (12.5kHz) FM emission only, 5W EIRP maximum.
- 11m HF CB channels - 5W EIRP maximum.
- 30 dBW max EIRP.
- NZART 60m sub-license applies. 11.8 dBW max EIRP.
- Suggested channel number for radio programming only (not formalized or published in GURL band plans).
- 22 and 23 are noted as 'telemetry' channels in Australia.
Please treat these as suggested calling channels only and QSY for longer discussions, as per standard radio ettiquete.
Schedule
Suggested activity times for QSOs and radio checks
The nets here are casual check-ins only with no formal script, just send out a PING, say hello and exchange a signal report to complete a Ribbit QSO!
| Band | Schedule |
|---|---|
| 70cm | Sundays 7:15 PM |
| 2m | Sundays 7:30 PM |
| PRS | Mondays 8:00 PM |
| 11m | Sundays 4:00 PM |
| 30m | 09:30 PM first Sunday every month |
| 60m | 09:30 AM first Sunday every month |
- Refer to band plan above for channel information.
- All times are NZ local times.
- The 30m and 60m schedule is on the same activity day as the Alpine Fault Network and staggered to not clash with the AFN SSB schedule.
- Ribbit and Rattlegram does NOT replace official emergency communication services like 111, in a real emergency always dial 111 first.