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

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.

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.

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.)

Useful Links for P/E Unions and Associations Area 1 ​ Union of Greek Radio Amateurs (SZ1SV) Association of Radio Amateurs of Greece (SZ1GRC) Association of Greek Radio Amateurs (SZ1HAG) Union of Radio Amateurs of Western Greece (SZ1A) RSF Hellas Volunteer Communications and Rescue Team (SZ1RSF) Thermos Trichonidos Radio Amateur Group (SZ1THT) Association of Radio amateurs IRIS Lavrio Amateur Radio Group Association of Radio Amateur Networks (E.RA.DIK) Area 2 ​ E.R.V.E. (SZ2TSL) E.RA.K. (SZ2SZ) E.RA.DY.M. (SZ2RWM) Thessaloniki Amateur Radio Group (SZ2T) Association of Radio Amateurs of Veria - Alexandria - Naoussa (SZ2VAN) Edessa Radio Club (SZ2EDE) Standard Radio Amateur Group (SZ2RPO) SY.RA.P. (SZ2RCP) Radio Amateur Club of Macedonia (SZ2M) Kastoria Amateur Radio Association (SZ2RCK) Association of Radio Amateurs of Kozani (SZ2KOZ) Florina Radio Club (SZ2RLF) Thessaloniki Radio Club SZ2GR Association of Radio Amateurs of Imathia Prefecture Area 3 ​ E.R.DY.P. (SZ3P) Association of Radio Amateurs of Ilia (SZ3I) Association of Radio Amateurs of Laconia (SZ3BCE) Association of Radio Amateurs of Peloponnese Peloponnese Amateur Radio Volunteer Group Area 4 ​ Union of Radio Amateurs of Thessaly (SZ4THE) Union of Radio Amateurs of Trikala (SZ4TRI) Karditsa Radio Club (SZ4KRD) Association of Radio Amateurs of Magnesia (SZ4SRM) Area 5 ​ Union of Radio Amateurs of Dodecanese (SZ5RDS) Area 6 ​ Union of Radio Amateurs of Ioannina (SZ6IOA) Union of Radio Amateurs of Arta (SZ6ARTA) Association of Radio Amateurs of Preveza (SZ6P) Area 7 ​ Association of Radio Amateurs of Thrace (SZ7TRC) Association of Radio Amateurs of Kavala (SZ7KVL) Association of Radio Amateurs of Serres (SZ7SER) Drama Radio Amateurs Association (SZ7DRM) Telecommunications Union of Thrace (SZ7XAN) Radio Amateurs Association of Xanthi (SZ7XTH) Evros Digenis Akritas Radio Amateurs Association (SZ7DAK) Area 8 ​ Union of Radio Amateurs of Cyclades (SZ8ERS) Union of Radio Amateurs of Lefkada (SZ8L) Union of Radio Amateurs of the North Aegean (SZ8LSV) Radio Amateurs Association of Lesvos (SZ8LES) Union of Radio Amateurs of Chios (SZ8ARC) Association of Radio Amateurs of Chios (SZ8XIO) Union of Radio Amateurs of the Central Aegean (SZ8S) Association of Radio Amateurs of Corfu (SZ8CFU) Association of Radio Amateurs of Naxos (SZ8NX) Union of Radio Amateurs of Evia (SZ8ERE) Area 9 ​ Union of Radio Amateurs of Crete (SZ9ERK)

Instructions Change System Manager in Program FRN Due to the recent decision to change the connection of the Hellas-FRN server from the Primary System Administrator to Alternate for reasons already published, it is necessary to reset the FRN user program in order to be able to access the network. There are two ways for someone to act: 1. To download the program recommended by the Alternative System Administrator in Java format and fill in his details, so he can then request a code and connect to the global FRN network. Then make registration on the site hellas-frn.net so that, since he is a radio amateur, he can be given access to the Greek server. 2. To appropriately modify the program of the Initial System Manager used until now, choosing one of the following two ways: First way is to add two lines to the FRN Client.ini file located at This PC> Main Disk (C:) > Program Files (x86) > FreeRadioNetwork > FRNClient. You will open it with notepad, make the addition and save it in the same place in the program. The text of the two lines is as follows: Second way is to use the FRN_Switch application, which once installed and running on your computer, does the same recording as the first way without you searching and writing to a file. ​ IMPORTANT: The initial FRN Client program will must be closed BEFORE you modify the FRN .ini with the FRN_Switch program, otherwise that modification will not be saved permanently, because the original FRN Client program always saves the current view of the FRN ini file from working memory to the drive at the end every program! This means that changes made in parallel via FRN_Switch are lost again... The modifications are read and accepted by the FRN program. Client only if you observe the execution sequence of the program. ​ The compressed fileFRN_Switch_Setup.zip you get it from HERE. You unzip it and inside the resulting folder you find the executable file with the same name. There is no security issue for viruses. Install where the program suggests and as shown in the following photos: ​ Here it should be known something that has been left unexplained and essentially becomes a mistake. In the above way and having let the program have installed the files automatically, basically when you run the same program multiple times on the same computer with different accounts, then the FRN Client .ini files are not all installed in the usual place in program files (Program Files X86) as shown above, but also in LOCAL APPDATA which will be difficult for you to find, because they belong to the hidden files and need a special search. This is done on newer Win10/11 operating systems. That is, you will also have a secondary .ini file that you did not know existed and you can find it if you search on the way C:\Users\"your user name"\AppData\Local\VirtualStore\ProgramFiles(X86)\FreeRadioNetwork\FRN Client\Secondary.ini The best way to avoid such hassle is to have FRN Client installed directly to the hard disk e.g. to have the path: C:\FRN\FRNClient ​ Upon completion of the above actions and having chosen to run the FRN_Switch program you will have this image. NOTE: If you do NOT have it and you see an error message it is because you are missing some DLL files which cannot be executed. This is due to lack of the required "VC++ Redistributable Packages" on the Windows in question you are using. To solve the issue go to the FRN_Switch installation folder and find the files named vcredist. You install and the problem is fixed. ​ File path C:\Program Files (x86)\FreeRadioNetwork DE\FRN_Switch ​ Then notice that you have an option for FRNClient and FRNServer. Select FRNClient and press Search FRN Ini Files at the top right. As you understand its purpose is to search and present the .ini FRN files you already have on your computer. The search result will be presented to you as in the images. Normally it will have one entry for you (the first one) and is usually what it finds in the programs folder. ​ If "Deep Search" is not selected, the program prefers to search the drive paths specified by certain system environment variables and are the relative standard paths where FRN Client Ini files can be found. ​ Instead, the Deep Search option is intended, for example, for FRN users who have not saved the original FRN client in their standard program paths. With "Deep Search", the selected drive can be FULLY searched for FRN ini files. ​ Here in the example the search was initially done without the deep search and presented only the first line. Then deep search was selected and searched again and presented two records because it looked at the same time in other places (hidden) of the C drive and found a secondary .ini file. ​ Notice that it has the files checked as belonging to Old FRN EU. (Original System Manager). Click right on New FRN DE (Alternate System Manager) so that the options are transferred, as shown in the second image. Double check that no FRN programs are running and press Save to save the changes. ​ After that, the program has gone and made entries in the .ini files so that they now work with the Alternative System Manager. ​ More details from the creator of the FRN_Switch program HERE Select the reading language at the top of the page. ​ Run the client program and tap the magnifying glass at the top. If everything is done correctly you will see all the servers that are connected in the Alternative System Manager. Notice that the hellas-frn.ddns.net server is listed in this list and the backup server hellasfrn.ddns.net below it. ​ In this state of the program if you request a code the request will be sent to Alternative now System Manager and from you will receive the code by email. If you had a code before May 1, 2023 and you request again, you will most likely get the same one again, since the Alternate System Manager kept the same database as the Original. ​ Press login and use FRN as before. ​ Welcome back to our team!....

ABOUT THIS SITE ​ This website is the result of a continuous effort to help Greek radio amateurs who are interested in the subject and the specific means of communication, whether it concerns the analog way of transmission, or its evolution in a digital way, or a combination of both of the above ways at the same time. It is constantly enriched with new explanatory and technical elements for the convenience of those involved in the use of the Free Radio Network. It has no relation whatsoever with other websites – blogspots, (or even occasional servers) which, as the case may be, refer to the subject of the Free Radio Network in Greece and involve PMRs, LPDs and (after notification with the clear limitations of the law) in the use of CBs . The posting of the website was done in such a way that we consider that works sufficiently explanatory to serve the requirements of the average of those concerned, in terms of language, style and concepts. It is made clear that it is aimed at colleagues with basic knowledge and relevant experience in using a computer connected to a transceiver, as well as the necessary concepts and understandings concerning digital communication networks. Therefore, for someone with zero knowledge about the subject, its training, involvement, regulation and operation, either of a client or of a gateway, despite his desire, it is required to make an effort to learn himself at the beginning as absolutely necessary condition and then attempt the application. The notion that someone, in TWO WORDS, will explain everything to him or someone else will set everything up for him, is beyond reality, since avoiding knowledge of the subject and direct operation (especially of a gateway) requires his personal involvement with the necessary elementary knowledge. What is written on this site is the necessary information about the subject and is not a "philosophical" rambling post per subject. If it is difficult for someone to read them, he should also recognize that nothing happens automatically by itself or that someone else is not going to do the work that he has to do. ​ ​ The current state of analog Internet communication has ECHOLINK and now the FRN. There are similarities but also serious and communication security-critical differences which are easily discernible elsewhere on this site. Determining the actual differences between the two programs above is left to the technical concern of those radio amateurs who deal with Internet communication programs. According to Ministerial Decision 38200/1136, Official Gazette 1969/2 Sep 2011 and in particular article 15, paragraph 6, as well as Decision 10800/310, Official Gazette B648 2013, the opportunity is given to implement technological innovations to support radio amateur activity by combining digital technology and the Internet. It broadens the horizon of employment for radio amateurs by applying these technologies, beyond those established to date, for experimentation, communication or even in case of need to offer to society as a whole. (Article 15, par. 6: " Communication between amateur radio stations is limited to the transmission and reception of communications of technical content related to tests and measurements, as well as to observations of a personal nature. Voice communication is carried out in clear language. The use of crypto-phony is prohibited , code words or any unknown code. However, in support of amateur radio activity, it is permitted to use known and internationally recognized technologies−encodings−configurations−protocols (new digital technologies and voice and/or data transmission applications such as indicatively D−STAR, DMR etc.) as well as the use of internationally recognized means of communication related to the Internet or other interconnected digital technologies." ) Attention: The above only concerns radio amateur activity, excluding the application to other types of non-radio amateur transceivers. (e.g., PMRs, LPDs, CBs). With your participation in the FRN program, either as a simple client, or as a gateway, but also with the GRN for Android devices, you help maintain, on the one hand, the existence of the Greek server on the international list of active FRN networks for the obvious reasons, on the one hand, to the general support of the whole effort, so that it continues to be maintained. 73! Administrator Hellas-FRN ​ ​

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

Regarding the safety of using the program in general or an online portal (node or gateway) and how it is controlled by the server's administrator in Hellas-FRN: The following image shows the capabilities of the server manager to ensure that other users will operate within the framework of a normal and safe broadcast through the simple use of a computer or a web portal on the amateur radio frequencies. The 4 colored "option buttons" are managed by only one. To a simple user of the program they do not appear and consequently the specific user is not able to change the usage status assigned to him by the server administrator. The manager can respectively: 1. Access list , (Λίστα Πρόσβασης) to allow access or not to a communications room, as well as the ability to broadcast with the web portal or not. This possibility is not intended by the program to be transferred to another. It belongs exclusively to the owner of the server. This list includes those who request access and are proven to be radio amateurs with a valid radio license. 2. Block list , (Λίστα Αποκλεισμού) to immediately block someone's access to the room if he behaves outside the defined limits of his use. In essence, it immediately stops him from connecting to the server. Resetting it requires a new action to remove it from the list, otherwise it remains permanently blocked. 3. Gag list , (Λίστα Φίμωσης) to prevent anyone in the room from speaking, or consequently to cause a broadcast to a web portal. He can only listen. It is applied in cases of technical problems that the specific person may have in the operation of the program and harasses the others to chat seamlessly. Resetting it requires an action to remove it from the list, otherwise it remains permanently muted. 4.List of approved administrators , (Λίστα Εγκεκριμένων Διαχειριστών) to delegate part of the server admin capabilities to radio amateurs operating radio stations as web portals as solely responsible owners of the station, through surveillance or for specific reasons and any other ordinary user with a computer in the communication room and they must also be able to block or mute a speaker who behaves outside the normal scope of using a transceiver on an amateur radio frequency. Authorization is personal and per communication room. In all the above restrictions imposed on a case-by-case basis by authorized persons on some others, for the sake of formality, the same persons who impose the specific measure should monitor the removal of the problem for reinstatement or continuation of the restriction. ​ The features that can be transferred from the server administrator to other people ONLY concern cases 2 and 3 above. That is, authorized people can only block or mute someone.