Click on the image to see the dashboard M17 is a digital radio modulation mode developed by Wojciech Kaczmarski (amateur radio call sign SP5WWP) et al. M17 is primarily designed for voice communications on the VHF amateur radio bands, and above. The project received a grant from the Amateur Radio Digital Communications in 2021 and 2022. The protocol has been integrated into several hardware and software projects.[citation needed ] In 2021, Kaczmarski received the ARRL Technical Innovation Award for developing an open-source digital radio communication protocol, leading to further advancements in amateur radio.[9] Technical characteristics Spectrogram of the M17 protocol transmission. Time is on vertical axis, advancing from bottom to top. There's a 40-millisecond preamble visible at the beginning of the transmission. M17 uses Frequency-Division Multiple Access (FDMA) technology in which different communication streams are separated by frequency and run concurrently. It utilizes 4,800 symbols per second, 4-level frequency-shift keying (4FSK) with a root Nyquist filter applied to the bitstream. Radio channels are 9 kHz wide, with channel spacing of 12.5 kHz. The gross data rate is 9,600 bits per second, with the actual data transfer at 3,200. The transmission, called stream, is divided into 40-millisecond long frames, each prepended with a 16-bit long synchronization word. A group of 6 frames form a superframe and is needed to decode the link information data. Protocol allows for low-speed data transfer (along with voice), e.g. GNSS position data. The mode has been successfully transmitted through EchoStar XXI and QO-100 geostationary satellites. The protocol's specification is released under GNU General Public License . Voice encoding M17 uses Codec 2 , a low bitrate voice codec developed by David Rowe VK5DGR et al. Codec 2 was designed to be used for amateur radio and other high compression voice applications. It is based on linear predictive coding with mixed-harmonic sinusoidal excitation. The protocol supports both 3200 (full-rate) and 1600 bits per second (half-rate) modes. Error control Three methods are used for error control: binary Golay code , punctured convolutional code and bit interleaving . Additionally, exclusive OR operation is performed between data bits and a predefined decorrelating pseudorandom stream before transmission. This ensures that there are as many symbol transitions in the baseband as possible. A 16-bit cyclic redundancy check (CRC) code is used for data integrity assurance. Application functions The M17 protocol was primarily designed for amateur radio use. Callsign encoding: 48-bit field holding up to 9 alphanumeric characters eliminates the need of a centralized user-ID database. Stream and packet modes of operation. Stream mode offers one 3200bps net bitrate channel (encoded speech or data) or two 1600bps channels (encoded speech alongside data). Packet mode supports text messaging, APRS and AX.25 . Slow-speed side channel for short and repeated data transfers, e.g. GNSS position data or telemetry. Encryption : Bit scrambler encryption: a pseudorandom binary sequence created by combining an exclusive-or bitwise operation on the audio or data stream and a linear-feedback shift register using one of 3 feedback polynomials with 255, 65,535 and 16,777,215-bit repeat periods. AES encryption : 128-bit block encryption cipher operating in CTR mode with user-selectable 128, 192 or 256-bit key. Hardware support Prototype of the CS7000 M17 handheld radio (CS760), running OpenRTX open-source firmware. With a small hardware modification, TYT MD-380, MD-390 and MD-UV380 handheld transceivers can be flashed with a custom, free, open source firmware to enable M17 support. In July 2024, a US-based company Connect Systems, Inc. released the CS7000-M17, being the first commercial off-the-shelf handheld transceiver with native M17 support. Bridging with other modes Links between M17 and other digital voice modes and Internet linked networks exist, with several networks providing M17 access. Modes bridged include DMR , P25 , System Fusion, D-STAR , NXDN , AllStarLink, EchoLink and IRLP . M17 over IP Access nodes and repeaters can be linked using reflectors. Over 100 M17 reflectors exist worldwide (June 2025). History The project was started in 2019 by Wojciech Kaczmarski in Warsaw , Poland . A local amateur radio club he was a member of, was involved in digital voice communications. Kaczmarski, having experimented with TETRA and DMR , decided to create a completely non-proprietary protocol and named it after the club's street address - Mokotowska 17 . As every part of the protocol was intended to be open source, Codec 2, released under the GNU LGPL 2.1 license, was chosen as the speech encoder. Applications and projects with M17 support OpenRTX - free and open-source firmware for ham radios DroidStar - digital voice client for Android SDR++ - multiplatform, open-source software defined radio receiver SDRangel - multiplatform, open-source software defined radio receiver/transmitter OpenWebRX - web-based software defined radio receiver mrefd - M17 reflector rpitx - general radio frequency transmitter for Raspberry Pi dsd-fme - digital speech decoder mvoice - voice client and graphical repeater application (Raspberry and Linux) mspot - hotspot software

Click on the image to proceed HBlink represents a server-side implementation of the Home-Brew Repeater protocol as defined by DMR+, MMDVM and Brandmeister. One can speak as a "peer/client" (ie a repeater or hotspot), or as a "server/master" (ie as any of the DMR networks an MMDVM device connects to). It has tools for selectively routing calls between groups of one or more devices. It can do this statically or dynamically. The number of "systems" (groups of devices or connections to other servers) and the number of devices connected to those systems are limited by the speed and size of available CPU and RAM respectively. HBlink is remarkably efficient for a Python program, and its upgrade to HBLink3 is about the corresponding use of the Python3 program. HBlink does not implement protocol translation to analog, or YSF, or D-Star or anything else.

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© Hellas-FRN.net * Trade marks FTDI, PROLIFIC, CMEDIA are not belonging to us. ** Depending the production year and version. Time protection of the gateway in TX and RX mode. Selectable ON or OFF, by internal jumper. The limiter works even on transceivers with VOX mode. Independent audio LEVEL for TX and RX. Full galvanic isolation between PC and Transceiver, as well as full RF shielding. Power supply 5V from USB B (PC). 5pin Din connector for input and output controls [AUDIO IN, AUDIO OUT, PTT, AF UNLOCKED (cos), XMTR's GND]. Adjustment for each type of transceiver. (Base, Mobile, Portable). USB Type B output for PC connection. Two 3.5 mm inputs for audio in and audio out of a separate external audio card. (not included). Dual PTT, to and from the PC program (via UART chip and microcontroller). Using FTDI* or Prolific. *, ** Protection against RF and for low power transceivers. Two-level board with metallic holes and vias for integrating upper and lower surface ground grids. Independent indications for power on, RX-TX and lock. Added ground point on the back face. Pass band RX audio filter 250Hz-3.2kHz For FRN, Echolink, Ham Radio Deluxe, cw Features - Specifications -Technical Data Supports voice and cw audio modes. Power Consumption: USB B < 92mA @ 4,8-5,2V DC. PTT: Open collector, driven from RTS/DTR, max 30V/400mA SQL: Input, normal closed @ high +5v DC to activate. Wired to CTS USB-B : Supports USB 1.1, USB 2.0 high speed. TX/RX : Supports halb dublex Level control : TX/RX 0 ~ +6dB Indicator Leds : Green : Power plugged in. Red : Time limiter is activated & input audio is muted Dual led : Green RX signal SQL input is activated / Red TX signal PTT out is activated Audio Out : Response: 80 Hz - 4.3 KHz +/-3dB Output impedance: 600 Ohms Output isolation: 6,5 kVDC Second Harmonic: -80 dB (typical) Audio In : Response: 80 Hz - 4.3 KHz +/- 3 dB Input impedance : 600 Ohms Input isolation: 6,5 kVDC Operation temperature : -10 to +60 °C Dimensions: W 155mm x H 40mm x D 105mm Requirements: Minimum : 800 MHz IBM PC compatible computer with Windows XP, 128 MB RAM, USB1.1 port Recommended : 1.6 GHz PC with Windows Vista or higher, 1GB RAM, USB2.0 port Supported operating systems : Windows XP ,Vista , Windows 7, 8,10,11 , Linux , Mac OS , Raspberry (all). Note : -Needs drivers for Mac OS -Linux : Plug and play -PTT output & SQL input are provided via a single TTL device using native FTDI drivers for the operating system . Notice: Trade marks FTDI are not belonging to us.

Like echolink, DVswitch can run simultaneously with Allstarlink in order to become a DIGITAL bridge with another program, e.g. DMR, NXDN, P25, etc. It creates its own dashboard so you can see the status of ASL's connections with other programs.

Click on the image to proceed AllStarLink is a network of Amateur Radio repeaters, remote base stations and hot spots accessible to each other via Voice over Internet Protocol. AllStarLink runs on a dedicated computer (including the Rasperry Pi) that you host at your home, radio site or computer center. It is based on the open source Asterisk PBX running our app_rpt application. App_rpt makes Asterisk a powerful system capable of controlling one or more radios. It provides linking of these radio "nodes" to other systems of similar construction anywhere in the world via VoIP. AllStarLink's primary use is as a dedicated computer node wired to your repeater or radio. Connections from Echolink, other VoIP clients and telephone calls are supported. Χρήστες ALL STAR LINK στον κόσμο

The AllStarLink network availability is over 99,99% . Over the past four years, AllStarLink has seen phenomenal growth. Four years ago, around 2,000 nodes were connecting to our servers at the same time. Now we are seeing over 10.000 nodes. With a generous grant from ARDC, last year we released ASL 3. It is the first new client in 15 years for AllStarLink. ASL 3 has been re-engineered to run on Asterisk 22 LTS with the latest Debian 12 Linux release and modern hardware. This is a major update for current customers running Asterisk Version 1.4. The new release incorporates over 15 years of Asterisk bug fixes, significant security improvements and enhancements. The update required extensive modification of "app_rpt", the Asterisk application that is Allstar. Many memory leaks have been addressed, modules now load or refresh more reliably, and many bugs have been fixed. All of this contributes to improved stability and uptime. We recommend that all AllStarLink users upgrade their devices, PCs, and Raspberry Pis to use the latest version of ASL 3. Over 3,700 nodes have already been upgraded and are currently using ASL 3. This includes nodes using Raspberry Pi 3, 4, or 5 (many of which were running Hamvoip), x86_64/AMD computers, and cloud nodes, Kits4Hams SHARI boxes, Node-Ventures ClearNodes, Repeater Builder, and Hotspot Radios. To learn more, read the ASL3 Handbook or join the AllStarLink Community. If you are using a hotspot device, we recommend that you contact the hardware manufacturer for specific upgrade instructions. Use the link below for a live view of Allstar Link connections Worldwide. The greatest concentration is observed in the USA (mainly) and England. The rest of the countries are slowly following this global way of communication that does not eliminate either the existing analog P/D and analog communication, nor the digital one, due to the interconnection capability. With the help of this suitable but not difficult connections, everything is now possible. https://stats.allstarlink.org/maps/allstarUSAMap.html AllStarLink is a network of Amateur Radio repeaters, remote base stations and hot spots accessible to each other via Voice over Internet Protocol. AllStarLink runs on a dedicated computer (including the Rasperry Pi) that you host at your home, radio site or computer center. It is based on the open source Asterisk PBX running our app_rpt application. App_rpt makes Asterisk a powerful system capable of controlling one or more radios. It provides linking of these radio "nodes" to other systems of similar construction anywhere in the world via VoIP. AllStarLink's primary use is as a dedicated computer node wired to your repeater or radio. Connections from Echolink, other VoIP clients and telephone calls are supported. ALL STAR LINK worldwide users