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NPR New Packet Radio

IP over 430MHz Ham Radio, up to 500kbps, 20W RF.
Extension for HSMM-Hamnet-AREDN. 100% open-source.

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NPR (New Packet Radio) is a custom radio protocol, designed to transport bidirectional IP trafic over 430MHz radio links (ham radio frequencies 420-450MHz). This protocol is optimized for "point to multipoint" topology, with the help of managed-TDMA.
Bitrate is up to 500kbps (net, effective bitrate).
The radio modem is cheap (~80$) and home-made, with a 433MHz ISM module inside. The modem is connected locally with Ethernet, therefore no specific software is needed on PC.
The modem is easy to build and reproduce.
You can add a DMR radio amplifier in order to achieve 20W radio power or more.
The main usage is an extension of HSMM - Hamnet - AREDN networks.
All the project is open-source : hardware, software, protocol specification.

NPR modems FOR SALE: https://www.elekitsorparts.com/product/npr-70

Low prices (79$ fully assembled). International shipping.


If you want to discuss about NPR:



watch full screen.


Documentation

Introduction and
quick start guide
v3.6 English
Introduction
et guide de
démarrage rapide
v3.6 Français
Advanced user guide (EN & FR) v2.14
Modem assembly and programing guide (EN & FR)
Spectrum Occupancy
NPR protocol Specification (EN)

PCB Design (Gerbers, BOM, etc...)

PCB v02 BOM Easy to provision
Total cost ~80 euros
per modem
BOM
(Bill Of Materials)
PCB files release note
PCB v03 Cheaper BOM
Total cost ~65 euros
per modem
BOM
(Bill Of Materials)
PCB files release note
PCB v04 Old version sold by
Funtronics.
Obsolete do not use.
-
PCB files release note
Add-on SRAM board for PCB v04 only -
PCB files release note
PCB v05 New version for
Funtronics.
Fits Funtronics enclosure
BOM
(Bill Of Materials)
PCB files release note

Modem Firmware : binaries and sources

Stable version
2020_02_23
Beta version
2020_06_29
Binary file, band 70cm Binary file, band 70cm
Binary file, band 2m Binary file, band 2m
Release note Release note
Source code Source code

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  • 6- Last news, updates

    f4hdk10/20/2019 at 14:59 0 comments

    29th June 2020:

    • Important firmware update about Ethenet mode configuration 10Mb/s or 100Mb/s, half or full duplex; it can solve a recurrent problem of packet loss and low datarate. Refer to the new version of the "advanced user guide". Many thanks to Kevin M0AHN who discovered the origin of the problem. 
    • Inside Advanced user guide : New recommendation added about daily reboot for modems which are ON 24H/day.

    23rd Feb 2020:

    • New firmware with new features
      • The modem can now drive an external PA with its GPIO port
      • In case of SPI SRAM present (auto detected), the TX data buffer is increased to 128kB instead of 16kB previously. Big improvement of the quality of IP connection.
      • Radio connection establishment time greatly reduced.
      • TX_test feature finally debugged and stable.
    • Documentation updated ("Advanced user guide" and "Assembly and programming guide") mainly about SPI-SRAM, about PTT ouptut, and about firmware upgrade.
    • Important info about SPI-SRAM :
      The RAM of the microcontroller used is too limited to have good performances, especially at Master side.
    • The usage of additionnal SPI-SRAM chip improves greatly performances, especially for Masters, by increasing the TX buffer length, and the SRAM chip is automatically detected and activated with the recent firmware 2020_02_23.
      Modems v02 and v03 already have this SPI-SRAM chip.
      Modems v04 (the one sold by Elekitsorparts-Funtronics up to march 2020) don't have the SPI-SRAM (it's my mistake, sorry).
      You can upgrade the hardware of a modem v04 via adding a SPI-SRAM add-on board.
      In order to determine if you need SPI-SRAM upgrade, read the dedicated paragraph inside the "advanced user guide".
      You can buy these SPI-SRAM add-on boards from :
      - Western-Europe : contact me f4hdk[at]free[dot]fr . Warning, I have limited production capacities.
      - rest of the world : soon available at Funtronics - Elekitsorparts

    20th Jan 2020:

    • Advanced user guide updated, mainly in order to clarify IP config of modems (client modems). Refer to revision history.
    • Important info: The solution 1 for upgrading the RAM (see below) is feasible, with external SPI SRAM. I will provide soon (february) cheap add-on SRAM boards, and a new firmware (compatible with and without this SPI-SRAM). For modems v04 only. v02 and v03 already have the SPI-SRAM, and the future version v05 will have it also.

    1st Jan 2020:

    • Documentation updated (advanced user guide and introduction) : command "TX_test", adding a fan on the amplifier, setting the MTU to 750 for better performances. 
    • Important info : for future features, especially for the Masters, and for improving performances (buffer size), the RAM of the microcontroller is not big enough (64kB). I have 3 options, not decided yet, currently the 3 are under test:
      • Solution 1 (prefered): use the existing SPI-SRAM (23LC1024) of PCB v02 or v03. For PCB v04, I could provide a (very) cheap add-on board, easy to solder on top of the Nucleo. It's a shame that I removed this chip inside v04, I'm very sorry, I thought is was useless...
      • Solution 2: use an external SPI-SRAM in QSPI configuration. The existing PCBs (v02, v03, v04) are not compatible at all, new PCB needed.
      • Solution 3: use a brand new microcontroller (Nucleo L476RG), with a totally new PCB, larger.

    8th Dec 2019:

    • Document "advanced user guide" updated, refer to "revision history" inside.

    26th Oct 2019:

    20th Oct 2019:

    • I have implemented the FDD (Frequency Division Duplex) feature, which is optional. You can now use separated frequencies for downlink and uplink (frequency shift), with one single modem at client side, and 2 modems and a RF duplexer at Master side (one modem for RX, one for TX).
    • New firmware released, and documentation (introduction, and advanced user guide) updated accordingly.

    29th Sept 2019: ...

    Read more »

  • 5- Planned or possible evolutions

    f4hdk05/12/2019 at 06:26 0 comments

    Please feel free to comment these lists of evolution, and express your requests, or your priorities. Either here or in the public chat.

    Planned evolutions

    • 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
    • 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.-> Cancelled feb 2020. The current hardware is already "mass produced" by Funtronics - Elekitsorparts
    • 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! --> done! (20th oct 2019)

  • 4- FOR SALE! (New Packet Radio modems).

    f4hdk04/22/2019 at 06:34 0 comments

    NPR modems for sale!

    https://www.elekitsorparts.com/product/npr-70
    Low prices (79$ fully assembled). International shipping.


    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 and website inside this blog post.

  • 3- Firmware history

    f4hdk04/22/2019 at 06:21 0 comments

    for later usage

  • 2- Deployment, NPR networks, tests

    f4hdk04/22/2019 at 06:20 1 comment
  • 1- Pictures

    f4hdk04/22/2019 at 06:19 0 comments

    For later usage.

View all 6 project logs

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Discussions

Marco wrote 06/23/2020 at 04:46 point

Hi all, yesterday I've installed the first NPR-70 link in Italy! Wow! Is it normal that the master continuosly transmits? I don't have much traffic on the link and there's only one client connected. The Master is connected to a switch. I was worried about the Broadcast packets. However I've removed the network cable and the Master continues to transmit every second. Any explanation ?

73 de iw2ohx - Marco

  Are you sure? yes | no

michael-schel wrote 06/19/2020 at 11:00 point

Intersymbol Interference is better with OFDM, but maybe 8PSK as used in 280kHz wide EDGE/GSM is possible too.

  Are you sure? yes | no

michael-schel wrote 06/19/2020 at 10:57 point

Regarding the higher modulations, TDMA, Header Compression, LDPC forward error correction I would run an Android or PC and a HACKRF via USB

  Are you sure? yes | no

michael-schel wrote 06/19/2020 at 10:55 point

I did an adress encoder Matrix, assuming maximum 64 clients on one Packet Radio Repeater, see link ...

  Are you sure? yes | no

f4hdk wrote 06/20/2020 at 08:00 point

@michael-schel Could you please continue the discussion in the "public tchat" dedicated to NPR70?

https://hackaday.io/messages/room/279145

The "discussion/comment" part of a hackaday-project (the one we use right now) is not designed for such long discussions.

  Are you sure? yes | no

Siegfried Loeffler wrote 06/18/2020 at 08:29 point

Wow, I'm impressed, and also I'm delighted somebody is still trying to do something like this. I haven't done any amateur radio for the last 20 years, my last steps were building a 9k6 RMNC node ;-) - One question thought, if I build one of these today, where can I find stations to connect it with? My main QTH is Paris 14/Montparnasse - 73 de Siegfried F/DG1SEK.

  Are you sure? yes | no

Cloolalang wrote 06/01/2020 at 16:01 point

Great Project!  A lot of work to make something cool!

Future possibilities:

Use AX 5043 for the 6 and 4 meter bands?

MIMO experiements

  Are you sure? yes | no

michael-schel wrote 05/04/2020 at 14:33 point

If I could add to wish-list:

1) higher modulation like 8PSK with small roll-off factor of 0.25
2) 1Byte (32Subscribers+Statusbits) for the packet header
3) LDPC FEC
4) Adjustable guard intervals for reflection supressions

Are there such chips on the market, or only possible with SDR?

  Are you sure? yes | no

f4hdk wrote 06/19/2020 at 05:02 point

@michael-schel I only see your comment today, sorry. What do you mean by "1byte for packet header"? I don't understand. The header is already 5 bytes long. You can read the "protocol specification" for more details.

The "guard interval" is not a problem for slow TDMA like NPR70. I already have 100 microseconds interval between frames, that is huge. Adjusting it will never solve the reflexion problem. The reflexion problem could be solved with much more complex modulations like OFDM.

Finally, I don't know any accessible chip which would make all that.

  Are you sure? yes | no

Kosma wrote 04/05/2020 at 09:11 point

Interesting but not mobile. I need small box (offgrid) for baofeng and working 20h per day (or one charged)

  Are you sure? yes | no

dave.roberts wrote 02/07/2020 at 11:06 point

Hi. Trying to rebuild the firmware but the makefile calls for a set of files in mbed-os/features/filesystem, but the folder is missing from the source zip file. Where do I find them?

I looked in github (https://github.com/ARMmbed/mbed-os/tree/mbed-os-5.15.0) but there is no such folder there as far as I can see. There are files with similar names in features/storage/filesystem and features/storage/blockdevice. Have they simply been moved or is this something different?

regards

Dave

  Are you sure? yes | no

dave.roberts wrote 02/07/2020 at 15:04 point

I started copying files to the locations indicated by the makefile then found that it messed up the relative locations of the headers referenced in the files, so then I copied over the frameworks folders needed and started updating the paths in the makefile, only to then discover that there are many other files that need copying. I stopped thinking you must either be using an old version or a different version or I am making a silly mistake.

Dave

  Are you sure? yes | no

RT wrote 01/29/2020 at 02:30 point

Hello, great project! I would like to leverage the 33CM band here in the states to make use of the full potential bandwidth. Can you release firmware to operate in the 902-928 MHZ Range?

  Are you sure? yes | no

thomas wrote 01/17/2020 at 08:18 point

I find it, thanks

  Are you sure? yes | no

thomas wrote 01/16/2020 at 19:35 point

How do I update the firmware from Windows or Linux?

  Are you sure? yes | no

f4hdk wrote 01/17/2020 at 05:40 point

Hello @thomas  I prefer to discuss in the "project chat" here : https://hackaday.io/messages/room/279145

Please go to the chat if you want to continue discussion.

Have you followed the process described inside the "assembly and programming guide"? Do you have some difficulties?

  Are you sure? yes | no

ostropest wrote 12/28/2019 at 22:22 point

nice but pygo are cheapest

in my opinion baofeng+soundmodem+linux (tnc, normal server) +power mobility

will be better.

for disaster.radio will be great

  Are you sure? yes | no

f4hdk wrote 12/29/2019 at 06:34 point

You cannot compare "New Packet Radio" and "baofeng + soundmodem". That's not the same goal, the same solution. You will never get 100kb/s to 500kb/s from a "baofeng + soundmodem"...

  Are you sure? yes | no

ostropest wrote 12/29/2019 at 18:52 point

I'm normal user ;)

I need send sms/shor message for friend, read info etc.

My friend have solar panel and live 5-20km near me. The goverment not working, and i have power if sun lighting

  Are you sure? yes | no

dl8ma wrote 12/21/2019 at 11:07 point

Hi,

I'm looking for the schematic for the NPR-70

73 de Jürgen, DL8MA

  Are you sure? yes | no

Kermit Kong wrote 12/21/2019 at 05:57 point

which RF-Duplexer can be used ?


best

DL4KA 

  Are you sure? yes | no

Erik Finskas wrote 12/03/2019 at 19:46 point

First two kits made it through the Finnish Post strike! Let the building begin!

I am already looking forward of a simple PA design. Does the modem provide a 'PTT' output to drive the TX/RX switch instead of a RF-VOX? That would simplify the PA design a bit. PIN diodes are fast enough and could be driven by this TX information from the modem.

  Are you sure? yes | no

buggbear wrote 01/11/2020 at 20:54 point

I am also interested in this quesion. Anyone figured out if there is a PTT / TX output signal available?

  Are you sure? yes | no

1221102 wrote 11/21/2019 at 04:39 point

Just got my first two NPR modems configured and on the air.  Let the testing begin.

  Are you sure? yes | no

DJ2RF Fritz wrote 11/05/2019 at 16:05 point

Are there any diferents between V3 Boomlist and V4 Boomlist? 73 DJ2RF

  Are you sure? yes | no

harzi wrote 07/19/2019 at 06:58 point

Dear Guillaume
I am using FW 2019_04_06 and have one master and two clients working without booster properly.

The gotechnique-booster weren't switching fast enough from RX to TX, but are transmitting also by the clients (anyhow, they have been withdrawn in newer guides as working compatible with NPR).

The booster VR-P25D (UHF) works only on the master. 'set RF_power 8' and higher let the VR-P25D transmit. Lower values 'RF_power 7' or less turn the booster TX off. The level is similar as the gotechnique-booster.

Unfortunate the two clients aren't able to switch the VR-P25D booster to TX. I also tried 'radio off' and 'TX_test', without success.

Do you have any advise? Does the new beta FW help and is it stable enough?

Best regards, HB9GVD

  Are you sure? yes | no

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