NPR-70 v05 Modem by F4HDK | New Packet Radio over 70cm Band | Amateur Radio Packet Radio | KIT VERSION

Notice:

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.

NOTE1: NPR-70 modem project page: https://hackaday.io/project/16409

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).

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