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Click on the image to proceed Project 25 (P25 or APCO-25) is a suiteof standards for interoperable digital two-way radio products. P25 was developed by public safety professionals in North America and has gained acceptance for public safety, security, public service, and commercial applications worldwide. P25 radios are a direct replacement for analog UHF (typically FM ) radios, but add the ability to transfer data as well as voice, allowing for more natural implementations of encryption and text messaging . P25 radios are commonly implemented by dispatch organizations, such as police , fire , ambulance and emergency rescue service, using vehicle-mounted radios combined with repeaters and handheld walkie-talkie use. Starting around 2012, products became available with the newer phase 2 modulation protocol, the older protocol known as P25 became P25 phase 1. P25 phase 2 products use the more advanced AMBE2+ vocoder, which allows audio to pass through a more compressed bitstream and provides two TDMA voice channels in the same RF bandwidth (12.5 kHz), while phase 1 can provide only one voice channel. The two protocols are not compatible. However, P25 Phase 2 infrastructure can provide a "dynamic transcoder" feature that translates between Phase 1 and Phase 2 as needed. In addition to this, phase 2 radios are backwards compatible with phase 1 modulation and analog FM modulation, per the standard. The European Union has created the Terrestrial Trunked Radio (TETRA) and Digital mobile radio (DMR) protocol standards, which fill a similar role to Project 25.

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 Install according to the instructions. An icon like the one shown on the top left of the photo will appear in your apps. Then tap to open the app. Πατήστε εδώClick here You start by selecting from the Settings menu Πατήστε εδώClick here Start filling in the order as shown in the corresponding points on the page... Πατήστε εδώClick here Click the FRN SystemManager Server option and select EU (second option). Attention, because the program defaults to the first one to guide everyone to the alternative FRN system with which the Hellas-FRN server does not cooperate. Πατήστε εδώClick here The address of the main server is hellas-frn.ddns.net and with port 10024. Note that there is also a backup server with the name hellasfrn.ddns.net and port 10024, which you put manually because it is not activated automatically like in windows when the mainly servers "crash" for some reason. Πατήστε εδώClick here You choose one of the communication rooms, here Ham1 is shown, but in case you have not yet received approval to access the Greek server, put the room "Test". Πατήστε εδώClick here Capitalize your token so it's legible. Πατήστε εδώClick here Continue with your name (in English). Be aware that with this type of name (together with the email you will write in the next line) it is the characteristics of your account that the system manager will rely on to give you a code to operate the application and access servers in general. Πατήστε εδώClick here Write your email address and be careful for any mistakes. You will receive the code at this address. Πατήστε εδώClick here Even in the code field we do not fill in anything since we have not yet made a request for it. You leave it blank and you will come back to fill it out when you receive it by email. Πατήστε εδώClick here In the FRN-Client type, select PC only, since it is a phone with a primary use for simple conversation. Πατήστε εδώClick here Proceed to fill in the rest of the required information... Πατήστε εδώClick here As an initial state select Available (QRV) which means that when you finally connect you will be able to use your microphone, while the other two options are: Unavailable (QRL) which means that you only listen, while in Away (QRT) neither you listen but you don't speak either. Πατήστε εδώClick here In this place you put information about the account or its use. Eg you can write FRN Client, or if it is an internet gateway the standard: Ham Radio FM Internet Voice Gateway Πατήστε εδώClick here In the next one, you choose from the list (and do not write it yourself) the country. Πατήστε εδώClick here Write the city (wider area) where the Client will work. Here of course since it is a mobile device you put the city you have declared on your license (as your base) or if you are permanently somewhere else state it here for better understanding in conversations Πατήστε εδώClick here Here you fill in your city part for more accuracy. (again the aforementioned applies to the position in the previous photo). You can also put the Locator here. Πατήστε εδώClick here Select the microphone type. The first option is also the most common. The mic gain level setting immediately below is optional as after testing you can come here and pull the bar right or left to adjust the configuration. Πατήστε εδώClick here Proceed to the rest of the settings, at least the ones that are selected as shown in this photo, but also the next ones in the series.... Πατήστε εδώClick here Press to select program language... Πατήστε εδώClick here ...and select Greek Πατήστε εδώClick here In connection attempts select as shown here, which is a reasonable number of connection attempts (when there is a problem) before it tells you that connection failed for some reason. Πατήστε εδώClick here Tap on the transmit time limiter to select the amount of time in seconds the program will let you PTT and talk. Πατήστε εδώClick here Choose 120 seconds or 180 if you like, time considered sufficient for a simple response from someone without exaggerating the level of chatter. Note that the problem occurs on the web portals that are on air when you speak and practically shouldn't be busy for long. But already know that these have a time limiter of around 180 seconds, so already time-consuming microphones and answers beyond 3 minutes are not heard. Πατήστε εδώClick here The program has the ability to record communication room activity. Choose the 3rd option as the most useful. 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.

Command to transmit via COM port (RS 232) The following photos show how a simple adapter (interface) can be made between a radio and a PC. A 9 pin connector has DTR on pin 4 and pin 5 is GROUND. (GND) Accessories These are the components used in the circuit: R1 = 330 Ω (Orange, Orange, Brown) (Resistor) R2 = 12 Ω (Brown, Red, Black) (Resistor) R3 = 1 kiloΩ (Brown, Black, Red) (Resistor) R4 = 1.5 kΩ (Brown, Green, Red) (Resistor) C1 = 4.7 microfarads (capacitor) D1 = 1N4148 (diode) T1 = BC549 (transistor) Plugs 2 stereo plugs for connecting to the sound card. 1 sub-d connector female for the COM port. 1 or 2 plugs for the P/D, depending on its model. Settings for the FRN Client The photo shows how to set up the FRN program to send the command through a COM port. Don't forget to disable VOX on the R/D. Select "Settings-->Adapter" (interface) to open the interface menu. Alternative circuits for adapting transceivers with a computer (interfaces). 1. Simple interface for handheld wireless. 2. Simple interface for mobile or base wireless 3. Interface without common grounding (galvanic isolation) for mobile or base wireless.

Thehellas-frn.net website has been translated for your convenience using translation software powered by third party services, such as Google Translate. Reasonable efforts have been made to provide an accurate translation, however, no automated translation is perfect nor is it intended to replace human translators. Translations are provided as a service to users of thehellas-frn.net website, and are provided "as is." No warranty of any kind, either expressed or implied, is made as to the accuracy, reliability, or correctness of any translations made fromGreek into any other language. Some content (such as images, videos, Flash, etc.) may not be accurately translated due to the limitations of the translation software.