The original System Manager has been completely inactive since January 2024. There is no information on its coming back.

Free projects are only for private use and not for commercial use. U-Ham Group have all the rights on all these free projects and could make changes at any time without any prior notice, so be updated frequently. User can use the projects at his own risk. Temperature dependent fan speed controller Schematic Features fan controller Adjustable start point Voltage operating range: 9v-15v Maximum temperature sensor cable length 1 meter LED indicator light for fan operation -------------------------------------------------- ------- It concerns a simple circuit to control the speed of a cooling fan based on the temperature measured by a temperature sensor (thermistor) placed at a suitable point on the P/D to "read" as closely as possible the output temperature of the machine. It is of course recommended to use a quality thermal paste for more reliable results. The whole circuit is designed on the property of the thermistor to change its internal resistance depending on the temperature change in its body. This one is of negative temperature coefficient -Negative Temperature Coefficient or otherwise NTC, which reduces its resistance as the temperature rises. This causes the mosfet Q1 to trig proportionally to its gate and by extension to affect the voltage of the fan and make it increase revolutions proportionally. There is a voltage threshold above which the fan starts to spin and in which the setting of VR1 plays a decisive role which creates a voltage divider and beyond that the revolutions depend proportionally on the temperature affecting the thermistor. The reverse also applies in case of a decrease in temperature. How to adjust the temperature sensor. Locate the VR1 regulator. Connect the voltage 13.8VDC and the fan as in the photo. Press the sensor with two fingers and with a screwdriver adjust VR1 until the fan is ready to start and the LED just starts to light up. Normally, this setting causes the fan to start slowly as the temperature reaches about 36°C and then increase the fan speed as the temperature rises. The opposite happens when the temperature drops and below 36°C the fan slows down until the falling voltage level cannot keep it spinning. Turn VR1 until the fan is at such a speed that it keeps the temperature at the level you want and if you want to change it from the set 36°C. Place the fan far enough away from the P/W heatsink that it will be effective, but not so close that it touches, as the reflected airflow comes back through the fan body and cancels the flow itself. Linkage (Applies to off-the-shelf device) Watch out for any mistakes especially in the position and polarity of the 13.8VDC wiring. The subpoenas can be seen in the photo. PCB The board was designed to match the specific plastic box

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Click on the image to see the dashboard The full form of NXDN is Narrowband Digital Exchange. It is defined by two main organizations viz. Icom Incorporated and Kenwood Corporation. It operates in VHF/UHF frequency bands and uses FDMA technology. Following are the specifications of NXDN. • NXDN offers clear voice quality with minimal background noise and interference. • NXDN offers secure communication through its digital encryption capabilities. • NXDN operates on either a 12.5 kHz channel or a 6.25 kHz channel bandwidth. It allows single carrier on one channel at a time. • NXDN supports multi-site trunking which enables seamless communication over a wide area by interconnecting multiple base stations. • NXDN supports data applications such as text messaging, telemetry, status monitoring and GPS location tracking. • NXDN offers better coverage and extends range compared to analog radio systems. • Some NXDN systems support roaming capabilities. • Many NXDN radios support both digital and analog modes which facilitates a smooth transition from analog to digital systems.

Hellas-Node Network. Διαχείριση ραδιοερασιτεχνικών ψηφιακών και αναλογικών δικτύων. This website refers to digital and analog networks of amateur radio applications and is in the process of continuous updating and upgrading, after being renamed to hellas-node.net. The hellas-frn network and all its pre-existing structure is included in this website as one of the supported analog communication systems, with revised management of communication rooms and in other analog networks. Recent Visits

Alternative way to connect to ECHOLINK from Computer, but also from android, without app installation. The echolink badge and code are required to enter. The above is an example of a connection. The yellow frame color is for standby, green when receiving and red when you press the Transmit button. Reliable and convenient program.

ALL STAR LINK worldwide users 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.

Click on the image to proceed Click on the image to proceed DVSwitch is a Client-Server application for Amateur Radio Digital Voice. This provides a "Server" application running on a Raspberry Pi (RPi) or other Linux platform. It can also be installed on a cloud server with Linux. The server application is distributed as an RPi image with all features and functions installed. Therefore, there is no need to download additional modules or programs or install them yourself on a Raspberry Pi. There are two clients available for DVSwitch. One is Android and it is available in the Google App Store to display almost any type of Android device. In addition to this there is also the python USRP Client (pyUC) which is available for use on Windows, Linux or Mac. DVSwitch supports all current Digital Voice functions without any additional hardware, except for D-Star. For the D-Star, an external vocoder circuit is used, such as the Northwest Digital ThumbDV dongle. For other functions, the Vocoder software included with DVSwitch provides high-quality sound, and while DVSwitch has been around for a long time, it was somewhat complicated to set up and mostly used by deep computer geeks. But with this version, an average radio amateur can get it up and running in less than 10 minutes. This release provides many new features, including the ability to change functions dynamically, customize Talk Groups, rooms and repeaters, either from the server or the client, and dynamically switch between DMR networks such as Brandmeister, TGIF, QRM etc.

Click on the image to see the dashboard TGIF Means (Thank God It's Friday). TGIF net started on a analog repeater in west central Florida. It was handed down to robert around the year 2015 and grew to over 50 check ins. A small group of them went to D-Star after the repeater was taken down and then moved over to DMR where we started the TGIF net again. It then moved to the Brandmeister system and has now found its final home as the mothership of the TGIF Network. TGIF Network was started in October, 2018 by Robert (K4WZV) and Mitch (EA7KDO). They started the TGIF Network with just one talkgroup which became 31665, and about 5 Amateur Radio Operators joined the Network, at this time the system was running on a Raspberry pi. Later on, Ty (KG5RKI) came on board to help improve the hblink code it was currently running on and move it to a cloud server, then later rewrote the backend to make what was called Callmgr. Michael (K5MRE) and Andy (G7LRR) also joined the team and created many of the features we enjoy on the website and plenty more behind the scene. Over the course of the next year, the network quickly grew from just a few hundred users to just under 5,500. The network now is home to around 776 active talkgroups available for all to use. The main/original talkgroup is original 31665, and is sometimes referred to as the 'Mothership' by many. All Amateur Radio Operators are welcome to join and try out what the network offers. The Network is still growing rapidly. Recently, Pi-Star and Shark RF Openspot added the TGIF Network to their list of networks. But this tale has not ended. Around the end of 2019, Ty (KG5RKI) could see limitations to how far Legacy would be able to scale with the growing number of clients. So, Ty took it upon himself to once again use his coding skills and knowledge of digital networking and in his spare time rewrite and design a network from the roots up which was codenamed 'Prime' and was open do beta testers during development. With Andy (G7LRR) as his partner in crime against the code, and Rob (K4WZV) having his back, the team is making fast progress at creating a great solution for ham radio operators around the world.

Introduction to FRN FRN is an analog-free online program that can bring together users of the same program (basically), but also in a combined way with other types of Internet programs in order to exchange opinions and experiences around topics of discussion that arouse their interest. The founder of freeradionetwork is Edwin, PA7FRN. From the last 3 letters of his badge came the name of the program created with his personal and long-term effort. The expression Free Radio Network refers to a generic expression that had to match his callsign for the honorific reasons. The expression Free is justified by the fact that there is no restriction to download and run the program once the passwords are obtained. It is a general communication tool with a very good management program. It depends on the server that one needs to connect to, what security controls they put in place and how they manage user access to their server. Here are the most important differences between Hellas-FRN and some other international servers that allow any use with any communication medium, even prohibited for use on the internet. Due to repeated numerous failures of the original monitoring server/system manager FRN, independent programmers were concerned about the future of the Free Radio Network. In 2016 they developed an alternative FRN monitoring server in Java to allow the Free Radio Network to run smoothly in the event of system administrator failures again. Due to its own database, this alternative system manager can work independently of the original monitoring server, but unfortunately it represents a parallel world that makes it necessary to re-register users and servers to this system, especially for those had received passwords by the Original System Manager FRN later than May 1st, 2023. FRN is used in different ways to use the program. The simple way is to use a computer and communicate only through it without the involvement of a transceiver. Another interesting way is to combine a computer and transceiver so that communication information is broadcast locally and allows the use of a transceiver to go online and communicate with correspondents located anywhere in the world. The third and last place is the operation in interaction mode between two programs on the computer, where the possibility of cooperation of similar programs with each other is now created (e.g., Echolink with FRN, Digital networks with FRN). It is a fact that the possibilities of the internet with the cooperation of communication programs - remote P/D control, on the computer, have changed the framework of perception of the concept of radio communication today. The ease of understanding and use of such programs by new wireless users creates different development prospects. The result of the ease of use of a program such as FRN, but also the disproportionately increased reach of even simple mobile devices due to the Internet, creates an increased interest in engaging with the subject. A separate parallel means of communication is the use of the GRN program for Android devices, where it acts as a simple user (client) in the FRN program. (More on page Downloads ). All of the above ways can work simultaneously and in combination, so the flexibility of accessing such a communications system is obvious, given that the issue of range has been resolved. The Hellas-FRN server consists of 31 communication rooms plus a test room. These communications are completely independent from each other with separate rules and security valves and functionally they correspond to the well-known TG (TalkGroups) of other networks. The connection of users takes place in a specific room each time, without a time limit of stay, with specific access conditions and not with a personal connect to a user token, such as echolink, in conference format. Because they concern communications on amateur radio frequencies, it is therefore necessary to control access to them in order not to create problems and violations related to the legislation on the operation of radio stations by radio amateurs. The existence and operation of an internet portal (gateway) on a predetermined radio amateur frequency also requires its use by licensed radio amateurs, whose license is valid. For those who wish to use a web portal through a specific room in FRN and specifically to be able to broadcast with it, they should activate through the registration and with conditions for good use of the frequency spectrum and a minimal footprint of band interference. Here it should be emphasized that a radio gateway uses only one frequency locally and neither the broadcast nor the communication information is transferred to another band. (Strictly simplex). RoIP Gateways (RoIP Gateways) connecting to the FRN Network give much greater range to portable/mobile radios. These are mandatorily placed in different locations. Everything received from one web portal is sent to other such web portals. They broadcast the received signal and cover communications at a local level, but in a completely different area than when someone is talking on a wireless. The limited range due to low P/W power in an area and the existence of only one gateway within its coverage area at a particular frequency provides the flexibility to use only one simplex frequency for many remote areas and thus avoids the whole process of employing multiple frequencies for a simple connection of two areas for a simple conversation. It also enables radio amateurs to talk with other colleagues through the web portals, but without owning a P/D themselves, by selecting the FRN Client mode and through a controlled access mode. The internet gateways are based on the FRN Client program and are connected to an FRN server. A group of such gateways form a network. Different networks can be active on a server. Any radio amateur within range of a web portal can communicate with fellow radio amateurs in another country or city simply by selecting the appropriate communication room, frequency and a CTCSS (sub-tone). Sub-tone blocking is mandatory in this case a transceiver as online gate not to be opened by noise or unwanted (perhaps malicious) signals and to minimize disturbance to others listening in the same communication room or frequency. With the FRN Client program, a portable/mobile wireless and a few electronic components, you can create a web portal yourself. You can also (alternatively) use the program with your computer's microphone to talk to other users on the network, without the need for a transceiver and for topics that are not necessarily related to radio amateurs, since there will be no broadcast on the air and so the program plays the role of aid for social networking of general interest. In conclusion, we could characterize FRN as a computer program that is free for simple social networking and in the case of P/D use without special equipment requirements or any financial contribution. There are no technical difficulties for anyone to install, but the possibility of placing reliable safety valves of multiple forms and interventions, where these are required for combined use of transceiver by radio amateurs, creates the distinct compared to other analog networks way to ensure safe and within the permitted limits of use. (Clarifications details on another page of this website.)