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.

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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

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.

GRN Client program to use mobile with a cell phone to contact hamradio operators via hellas-frn server. For a better visual presentation of the GRN settings press the button labeled "Click here" below Instructions for connecting the FRN Client to the program for Android. After installing the program on the mobile, follow the steps below to set it up by entering your personal account information. Note that in the initial installation of the program there is a default to request a password from the Alternate System Manager (DE), since he is the one who has also issued the program. When this is done and you get a password, you will be able to log in and you will see that the hellas-frn.ddns.net server is there, connected to Alternative. So choose (DE) to avoid delays and failures. In some photos, a Greek keyboard can be seen by mistake. You MUST use English characters exactly as listed in your existing account. Android operating system is used in the photos below 13 on SAMSUNG mobile. Minor differences may be observed in other Android versions. Since December 2023 there are two versions of GRN Client , depending on the Android version you use in your cellphone. Version V 4.xx is for Android V6 to V8 and you can download it HERE. Version V 5.xx is for Android V9 and higher and you can download it HERE. Connect to the serverhellas-frn.ddns.net:10024 and communication room the General or Test as a start for the sound settings and then select one of the active rooms for radio amateurs provided you have been granted entry through Registration . GRN Client Android Κάνετε την εγκατάσταση σύμφωνα με τις οδηγίες. Στις εφαρμογές σας θα εμφανιστεί ένα εικονίδιο όπως αυτό που φαίνεται πάνω αριστερά στη φωτό. Μετά πατήστε να ανοίξει η εφαρμογή. Πατήστε εδώClick here Ξεκινάτε με την επιλογή από το μενού "Ρυθμίσεις" Πατήστε εδώClick here Ξεκινήστε να συμπληρώνετε με τη σειρά όπως φαίνονται τα αντίστοιχα σημεία της σελίδας... Πατήστε εδώClick here Πατήστε την επιλογή Διακομιστής FRN System Manager και επιλέξτε την DE (πρώτη επιλογή). Προσοχή, εδώ δείχνει την προηγούμενη κατάσταση η οποία όμως άλλαξε και πλέον επιλέγετε τον DE με τον οποίο συνεργάζεται ο Hellas-FRN Πατήστε εδώClick here Η διεύθυνση του κυρίως σέρβερ είναι hellas-frn.ddns.net και με πόρτα 10024. Υπόψη ότι υπάρχει και εφεδρικός σέρβερ με το όνομα hellasfrn.ddns.net και πόρτα 10024, τον οποίο τον βάζετε χειροκίνητα γιατί δεν ενεργοποιείται αυτόματα όπως σε windows όταν ο κυρίως σέρβερ "πέσει" για κάποιο λόγο. Πατήστε εδώClick here Επιλέγετε ένα από τα δωμάτια επικοινωνιών, εδώ φαίνεται το Ham1, αλλά στην περίπτωση που δεν έχετε πάρει ακόμη έγκριση για πρόσβαση στον Ελληνικό σέρβερ, βάλτε το δωμάτιο "Test" . Πατήστε εδώClick here Γράψτε το διακριτικό σας με κεφαλαία ώστε να είναι ευανάγνωστο. Πατήστε εδώClick here Συνεχίστε με το όνομά σας (στα Αγγλικά). Προσοχή στο ότι με αυτό το τύπο του ονόματος (μαζί με το email που θα γράψετε στην επόμενη γραμμή) είναι τα χαρακτηριστικά του λογαριασμού σας που θα βασιστεί ο system manager για να σας δώσει κωδικό λειτουργίας της εφαρμογής και πρόσβασης σε σέρβερς γενικά. Πατήστε εδώClick here Γράψτε την διεύθυνση του ηλεκτρονικού ταχυδρομίου σας και με προσοχή για τυχόν λάθη. Σε αυτή τη διεύθυνση θα σας έρθει ο κωδικός. Πατήστε εδώClick here Ακόμη στη θέση κωδικός δεν συμπληρώνουμε κάτι εφόσον ακόμη δεν έχουμε κάνει αίτημα για αυτό. Το αφήνετε κενό και θα επανέλθετε να τον συμπληρώσετε όταν τον λάβετε με email. Πατήστε εδώClick here Επιλέξτε στον τύπο του FRN-Client το PC only μιας και πρόκειται για τηλέφωνο με κύρια χρήση την απλή συνομιλία. Πατήστε εδώClick here Προχωρήστε στη συμπλήρωση και των υπολοίπων απαιτούμενων στοιχείων.... Πατήστε εδώClick here Ως αρχική κατάσταση επιλέξτε Διαθέσιμος (QRV) που σημαίνει ότι όταν στο τέλος θα συνδεθείτε θα μπορείτε να κάνετε χρήση του μικροφώνου σας, ενώ οι άλλες δύο επιλογές είναι: Μη διαθέσιμος (QRL) που σημαίνει ότι μόνο ακούτε, ενώ στο Απών (QRT) ούτε ακούτε αλλά ούτε και μιλάτε. Πατήστε εδώClick here Στη θέση αυτή βάζετε πληροφορίες περί του λογαριασμού ή τη χρήση του. Πχ μπορείτε να γράψετε FRN Client, ή αν πρόκειται για διαδικτυακή πύλη το τυποποιημένο: Ham Radio FM Internet Voice Gateway Πατήστε εδώClick here Στο επόμενο επιλέγετε από τη λίστα (και όχι να αναγράψετε εσείς) τη χώρα. Πατήστε εδώClick here Γράψτε την πόλη (ευρύτερη περιοχή) που θα λειτουργεί ο Client. Εδώ βέβαια επειδή πρόκειται για φορητή συσκευή βάζετε την πόλη που έχετε δηλώσει στην άδειά σας (ως βάση σας) ή αν βρίσκεστε μονίμως κάπου αλλού δηλώστε το εδώ για καλύτερη κατανόηση στις συνομιλίες Πατήστε εδώClick here Εδώ συνμπληρώνετε το μέρος της πόλης σας για περισσότερη ακρίβεια. (και πάλι ισχύουν τα προαναφερθέντα για την θέση στην προηγούμενη φωτό). Επίσης μπορείτε να βάλετε και το Locator εδώ. Πατήστε εδώClick here Επιλέξτε τον τύπο του μικροφώνου. Η πρώτη επιλογή είναι και η πιο συνηθισμένη. Η αμέσως παρακάτω ρύθμιση για το επίπεδο κέρδους μικροφώνου είναι προαιρετική καθόσον μετά στις δοκιμές μπορείτε να έρθετε εδώ και να τραβήξετε την μπάρα δεξιά ή αριστερά για ρύθμιση της διαμόρφωσης. Πατήστε εδώClick here Προχωρήστε και στις υπόλοιπες ρυθμίσεις τουλάχιστον σε αυτές που είναι επιλεγμένες όπως φαίνονται σε αυτή τη φωτό, αλλά και στις επόμενες στη σειρά.... Πατήστε εδώClick here Πατήστε για επιλογή γλώσσας του προγράμματος... Πατήστε εδώClick here ...και επιλέξτε Ελληνικά Πατήστε εδώClick here Στις προσπάθειες σύνδεσης επιλέξτε όπως φαίνεται εδώ, που είναι ένας λογικός αριθμός προσπαθειών σύνδεσης (όταν υπάρχει πρόβλημα) πριν σας ενημερώσει για αποτυχία σύνδεσης για κάποιο λόγο. Πατήστε εδώClick here Πατήστε στον περιοριστή του χρόνου μετάδοσης για επιλογή σε δευτερόλεπτα του χρόνου που το πρόγραμμα θα σας αφήνει να κάνετε PTT και να μιλάτε. Πατήστε εδώClick here Επιλέξτε τα 120 δευτερόλεπτα ή τα 180 αν θέλετε, χρόνος που θεωρείται ικανός για μια απλή ανταπόκριση κάποιου χωρίς υπερβολές στο επίπεδο φλυαρίας. Υπόψη ότι το πρόβλημα δημιουργείται στις διαδικτυακές πύλες που βρίσκονται σε εκπομπή όταν εσείς μιλάτε και πρακτικά δεν θα πρέπει να απασχολούνται επί μακρόν. Ήδη όμως να γνωρίζετε ότι αυτές διαθέτουν χρονικό περιοριστή περίπου στα 180 δεύτερα οπότε ήδη χρονοβόρα μικρόφωνα και απαντήσεις πέραν των 3 λεπτών δεν ακούγονται. Πατήστε εδώClick here Το πρόγραμμα έχει τη δυνατότητα να καταγράφει την δραστηριότητα του δωματίου επικοινωνίας. Επιλέξτε την 3η επιλογή ως προς την πιο χρήσιμη. Πατήστε εδώClick here Click on the following options to see the usage of the GRN Client in car multimedia console: HELLAS-FRN and GRN-Mobile Digital networks and HELLAS-FRN (1) Digital networks and HELLAS-FRN (2) How do I install Android apps without Play Store Android device owners can install apps either through the official storesGoogle Play Store, either from independent app stores, or by downloading the APK files from various sources. Below is how one can install apps without Play Store. Install via APK In the preAndroid Oreo versions, the operating system had only one setting that needed to be changed. From then on, any app we had on our mobile could install apps without the Play Store. However, from Android 8.0 onwards we have to give permission to each app separately. Fortunately, we can find gathered all the apps that can install APK in a specific point of its settingssmartphones . First we enter the mobile settings and go to "Applications and notifications"(Εφαρμογές και ειδοποιήσεις). Then we open the “Special access to the application”(Ειδική πρόσβαση στην εφαρμογή) menu and find “Install unknown applications” (Εγκατ. άγνωστων εφ.). From the list of apps we select the one we want to install apps and make sure the "Allow from this source"(Να επιτρέπεται από αυτην την πηγή) switch is active. We repeat the last step for all applications that we want to be able to install APK files.

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.)

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.