05/12/2019 at 06:28 •
9th July 2019:
- NPR kits are now for sale at https://shop.thinkstack.de/en/ham-radio/20-new-packet-radio-npr.html (Europe only)
16th June 2019:
New firmware with 3 new features. Documentation updated accordingly.
- New modulations (11, 12, 20, 21) for lower datarates, lower bandwidth. Symbol rates: 56kS/s (complies with FCC) and 120kS/s.
- Frequency range extended to 420-450MHz instead of previously 430-440MHz
- Regular SI4463 temperature check, and chip re-calibration if delta temperature above 15°C.
2nd June 2019:
- Compatibility of DMR RF amplifier "gotechnique.com" set to "NO" inside "advanced user guide".
- 1st tests of VoIP over NPR. Good in most condition, surely because I have a router with QoS at Master side. Would be better with true "QoS" inside NPR modems.
14 may 2019 :
- Horizontal polarization recommendation removed from documentation (because IARU do not recommend anymore particular polarization)
12 may 2019 :
- introduction of new PCB design v03, cheaper. (The version 02 can still be used)
- New blog post "planned and possible evoltutions"
05/12/2019 at 06:26 •
Please feel free to comment these lists of evolution, and express your requests, or your priorities. Either here or in the public chat.
- Better FEC algorithm, because currently it is very poor. If you can give me some help, I don't understand a lot standard FEC algo (with all these Maths).
Regular temperature check and re-calibration of SI4463 if necessary-> done! (firmware 2019_06_16 and above)
- Increase to 15 clients instead of currently 7 maxi. → Probably not feasible with current hardware at Master side, not enough RAM (new hardware under study)
Possible evolutions, if people are interested (raw order, no priority order):
Static IP management of some modems→ Removed because you can use future
"L2 pure ethernet transport feature"which will be more flexible
- Management via pure serial port (instead of USB)
- L2 Ethernet transport configuration (instead of currently L3 IPv4); could enable more flexibles topologies, and IPv6 compatibility. But a little bit less efficient.
Extension of frequency range to 420-450MHz instead of currently 430-440MHz (IARU region 1 limits)-> done! (firmware 2019_06_16 and above) Other modulation parameters, with lower datarates, in order to decrease RF bandwidth-> Done (firmware 2019_06_16 and above)
- QoS necessary in order to transport VoIP data over an NPR network
Very hypothetical evolution:
- Totally new design, microcontroller with more RAM, PCB optimized for automatic PCB assembly line. Goal would be to mass produce fully assembled modems. Probability low, only if enough people are interested.
- Frequencies split between uplink and downlink (in case you use NPR Master in a tower where a UHF FM repeater is already present). Additionally, the Master could be used in "FDD" (Frequency Division Duplex) mode in order to use these 2 frequencies simultaneously, like 2G or 3G mobile phones. 2 modems required at Master side. Complex!
04/22/2019 at 06:34 •
NPR kits are now for sale from this German web-shop. Currently shipping only to Europe (EU + EFTA).
If you want to sell kits from/to a particular region (either Europe or US or another), then I can add your contact e-mail inside this blog post.
04/22/2019 at 06:21 •
for later usage
- 04/22/2019 at 06:20 • 0 comments
04/22/2019 at 06:19 •
For later usage.