--- title: "NPR-70 v05 Modem by F4HDK | New Packet Radio over 70cm Band | Amateur Radio Packet Radio | Factory-Assembled" url: "https://maker.wiznet.io/gavinchang/resellers/NPR70-v05-Modem-by-F4HDK-New-Packet-Radio-over-70cm-Band-Amateur-Radio-Packet-Radio-FactoryAssembled/" markdown_url: "https://maker.wiznet.io/gavinchang/resellers/NPR70-v05-Modem-by-F4HDK-New-Packet-Radio-over-70cm-Band-Amateur-Radio-Packet-Radio-FactoryAssembled/md" type: "VAR: Value-Added Reseller Products" author: "Gavin" author_url: "https://maker.wiznet.io/gavinchang/" original_author: "gavinchang" published: "2022-08-01" language: "en" likes: 0 views: 301 comments: 0 source: "WIZnet Makers (https://maker.wiznet.io/)" --- # NPR-70 v05 Modem by F4HDK | New Packet Radio over 70cm Band | Amateur Radio Packet Radio | Factory-Assembled > NPR-70 v05 Modem by F4HDK | New Packet Radio over 70cm Band | Amateur Radio Packet Radio | Factory-Assembled Original author: gavinchang ## Article New:?**Due to the shortage of STM32 and other chips, the price of NUCLEO-L432KC, 23LC1024-I/SN and other parts have increased a lot, so we add $8 to the original price, now it is $81.99.** Due to the pandemic of COVID-19, international shipments are busy and delayed a lot, as many airlines and borders of countries are shutdown.?**There is a big chance for the shipments delayed during transition in this special time.**?If you have any questions regarding your order or about any of our products, please feel free to contact us. **Note for USA :**?Due to CFR 47 Part 97.3 FCC regulations, for the 70cm amateur radio band (restriction to 100kHz and 56kBaud), only the setting “modulation 20” of NPR-70 seems to be legal in USA. Please always check your local amateur-radio regulation before buying and using NPR70. Modulation 20: Symbol Rate 50kS/s, bandwidth 100kHz, raw datarate 100kb/s raw, usable datarate 65kb/s. Tired of the low data rate on the old-styled tradditional packet radio? Here comes the NEW PACKET RADIO by French Ham F4HDK. NPR-70 means?*new packet radio*?over 70cm band. The NPR-70 is a open source project posted on HACKADAY. The modem’s protocol is designed by F4HDK, without any encryption, which meets the regulations by amateur radio laws. Meanwhile, the modem has a built-in radio transceiver with 500mW RF power output, so there is no additional external radio needed for transmitting and receiving radio signals. You may add a RF power amplifier to boost the 500mW. The configuration of the modem could be done from a PC via telnet or USB-serial Terminal, no additional softwares needed. Now authorized by the original author F4HDK, elekitsorparts.com is proud to produce the NPR-70 modem kit for sale.You can either buy an assembled unit or buy a true kit which needs to be soldered and assembled by yourself. ![](https://elekitsorparts.com/wp-content/uploads/2021/11/point-to-multipoint-link.jpg)![](https://elekitsorparts.com/wp-content/uploads/2021/11/point-to-point-link.jpg) **NOTE1:?**NPR-70 modem project page:?[https://hackaday.io/project/16409](https://hackaday.io/project/164092) **NOTE2:**?The modem can work in “Normal” or “Remotely Manageable” mode. The configuration for these 2 modes is done via the solder joints on STM32L432KC mcu module.You have to solder the jumper SB9(short) on STM32 module to work in “Remotely Manageable” mode, and dis-solder SB9(Open) to work in “Normal” mode. It is really a tough job to dis-solder these tiny jumpers on the board, so we have done this job for our users. You may solder or dis-solder SB9 again in the future for configuring the modem remotely or normally(locally).?**A “Remotely Manageable” modem should be permanently connected via USB to a PC，a Raspberry Pi or any other hosts that could be remotely accessed via IP network.?If you don’t understand the difference between the 2 proposed configurations, you should select a ‘Normal’ one.**?For the detailed explanation on these jumpers and the two working modes, please do not forget to check F4HDK’s documents (NPR_modem_assembly_guide and NPR_advanced_guide) on his hackaday project page. **NOTE3:**?**The price here is only for a single modem only.**?You need at least 2 modems(a pair) for establishing a NPR network. A minimum NPR network consists of one “master” modem and one “client” modem. **NOTE4:**?Not all of the UHF power amplifiers on the market can work with NPR-70, and only few of them can do that job. We have also listed a known compatible and workable RF amplifier model in our web store, so please see the “Related products” at the bottom of this page. There is a RF amplifier compatibility list on F4HDK’s document, NPR_advanced_guide. **NOTE5:**?Download the assembly guide here?[(H10015K_NPR-70_Modem_Kit_Assembly_Guide)](https://elekitsorparts.com/wp-content/uploads/2020/04/H10015K_NPR-70_Modem_Kit_Assembly_Guide-Rev1.1.pdf). ![](https://elekitsorparts.com/wp-content/uploads/2021/11/npr-70-v05-PCB_2-scaled.jpg) ![](https://elekitsorparts.com/wp-content/uploads/2021/11/corner-view-inner.jpg) ![](https://elekitsorparts.com/wp-content/uploads/2021/11/npr-70-v05-main.jpg) ***Features:*** - Open source, both of the?hardware and software. - Bidirectional IP network over radio link - High baudrate, up to 500kbps on 70cm band - Standalone use, no additional radios or softwares needed - A UHF RF power amplifier could be used for extending the distance of NPR-70 radio link - No encryption applied to the data transmitted, meet the requirement of amateur radio regulation rules - Work in the existing IPv4 netowrk, no other gateways needed - Lightweight, suitable for temporarily establishing a DX cluster link on field day ***Specification:*** - Size: 99.6mm x 64mm x 48mm - DC Voltage: 9V to 20V in, 12V is recommended - DC Current: Below 200mA while in working, 70mA in idle - Radio Core: SI4463 - Frequency Range: 420MHz to 450MHz - RF Power Output: 500mW(MAX) & 27dBm - Radio Link Topology: Point to Multipoint or Point to Point - Modulation: 2GFSK or 4GFSK - Datarate: up to 500Kbps ![](https://elekitsorparts.com/wp-content/uploads/2021/11/configuration-example.jpg) ## Related products --- Source: https://maker.wiznet.io/gavinchang/resellers/NPR70-v05-Modem-by-F4HDK-New-Packet-Radio-over-70cm-Band-Amateur-Radio-Packet-Radio-FactoryAssembled/