1. Einleitung
The Retevis RT97S is an advanced GMRS repeater designed to extend the range of two-way radio communications. This upgraded version of the RT97 offers full duplex operation, compatibility with Raspberry Pi for enhanced networking, and a portable design suitable for various environments. This manual provides essential information for the proper setup, operation, and maintenance of your RT97S repeater.

Image 1.1: The Retevis RT97S GMRS Repeater main unit, showcasing dank seiner kompakten und robusten Bauweise.
2. Produktüberschreitungview und Hauptmerkmale
The RT97S GMRS Repeater is engineered for reliable and extended communication. Key features include:
- Vollduplex-Betrieb: Allows simultaneous transmission and reception, reducing communication delays.
- Raspberry Pi Compatibility: Features a DB-9 female connector for direct connection to a microphone and compatibility with Raspberry Pi, enabling interconnection of multiple RT97S units for extended range.
- GMRS Radio Base Station: Comes with 8 default GMRS channels, compatible with various Retevis GMRS radios.
- Erweiterte Kommunikationsreichweite: Ideal for connecting emergency calls beyond the direct range of walkie-talkies, suitable for schools, outdoor activities, remote areas, farms, and towns.
- Built-in Duplexer: Utilizes a single antenna for both transmitting and receiving signals.
- Langlebige Konstruktion: All-aluminum alloy shell provides resistance to impacts and efficient heat dissipation for long-term use.
- Kompakt und tragbar: Designed for mobile or simple fixed installations, can be used in vehicles or mounted on structures.
- LCD Bildschirm: Provides clear display of operational status and channel information.

Image 2.1: Illustration of the built-in duplexer enabling simultaneous transmit and receive functions.

Image 2.2: The RT97S repeater demonstrating its compact and portable design for easy transport.
3. Packungsinhalt
Upon unpacking your Retevis RT97S GMRS Repeater, please verify that all the following items are included:
- 1 x RT97S GMRS Base Station
- 1 x Ladegerät
- 1 x Netzteil
- 1 x Datenkabel
- 1 x English User's Manual (this document)
Note: The antenna is not included in the package and must be purchased separately.

Image 3.1: All components included in the RT97S GMRS Repeater package.
4. Einrichtungsanweisungen
Follow these steps to set up your Retevis RT97S GMRS Repeater for optimal performance.
4.1 Stromanschluss
- Connect the power supply to the repeater's power input port.
- Plug the power supply into a suitable power source (wall outlet, car power, or solar charging system). The repeater does not have a separate on/off switch; it powers on automatically when connected.

Image 4.1: Powering the RT97S repeater using a wall outlet, car adapter, or solar panel.
4.2 Antennenanschluss
- Connect your GMRS antenna (not included) to the antenna port on the repeater. Ensure a secure connection.
- Position the antenna in a location that provides clear line-of-sight for maximum range and minimal interference.
4.3 Raspberry Pi and Microphone Connectivity (Optional)
The RT97S features a DB-9 female connector for advanced applications:
- Mikrofonanschluss: A compatible microphone can be directly connected to the DB-9 port.
- Raspberry Pi Integration: Connect a Raspberry Pi (additional components not included) to the DB-9 port to enable interconnection of multiple RT97S repeaters. This setup can significantly extend communication distance by creating a network of repeaters.

Image 4.2: The RT97S repeater demonstrating compatibility with Raspberry Pi for advanced networking.
4.4 Installationsoptionen
The compact design of the RT97S allows for flexible installation:
- Mobile Installation: Can be placed in a vehicle as a substitute for an on-board transceiver.
- Festinstallation: Can be mounted on a roof, wall, or other suitable structure to serve as a base station.

Image 4.3: Various installation scenarios for the RT97S repeater, including mobile and fixed setups.
5. Bedienungsanleitung
The RT97S is designed for user-friendly operation with its intuitive controls and LCD screen.
5.1-Kanal-Umschaltung
- To switch between the 8 default GMRS channels, lange drücken the button located on the front panel for three seconds.
- The LCD screen will display the current channel. Use the up/down buttons to navigate through available channels.
5.2 Lautstärkeregelung
To adjust the volume, kurz drücken the button on the front panel. Use the up/down buttons to increase or decrease the volume level.
5.3 LCD-Bildschirminformationen
The LCD screen provides real-time information about the repeater's status, including the active channel and operational mode.

Image 5.1: The LCD screen and control buttons for user-friendly operation.
6. Wartung
Proper maintenance ensures the longevity and reliable performance of your RT97S GMRS Repeater.
- Reinigung: Use a soft, dry cloth to clean the exterior of the repeater. Avoid using harsh chemicals or abrasive materials.
- Umgebungsbedingungen: While the aluminum alloy shell is durable, avoid exposing the repeater to extreme temperatures, direct sunlight for prolonged periods, or excessive moisture. The device is not water-resistant.
- Verbindungen: Periodically check all cable connections (power, antenna, data) to ensure they are secure and free from damage.
- Wärmeableitung: Ensure the repeater's heat dissipation fins are not obstructed to maintain optimal operating temperature.
7. Fehlerbehebung
If you encounter issues with your RT97S GMRS Repeater, refer to the following common troubleshooting steps:
| Problem | Mögliche Ursache | Lösung |
|---|---|---|
| Repeater does not power on. | No power connection or faulty power supply. | Ensure the power supply is securely connected to both the repeater and a working power outlet. Check the power supply for damage. |
| Kein Signalempfang/-übertragung. | Antenna not connected, incorrect channel, or out of range. | Verify the antenna is properly connected. Check that your radios are on the correct GMRS channel. Ensure radios are within the repeater's operational range. |
| Poor communication quality. | Antenna placement, interference, or duplexer power loss. | Adjust antenna position for better line-of-sight. Minimize sources of electrical interference. Be aware of potential power losses due to the built-in duplexer. |
| Cannot switch channels or adjust volume. | Falsche Tastendruckdauer. | For channel switching, lange drücken the button for three seconds. For volume adjustment, kurz drücken die Schaltfläche. |
Sollte das Problem nach dem Ausprobieren dieser Lösungsansätze weiterhin bestehen, wenden Sie sich bitte an den Retevis-Kundendienst, um weitere Unterstützung zu erhalten.
8. Spezifikationen
Detailed technical specifications for the Retevis RT97S GMRS Repeater:
- Modellnummer: RT97S
- Artikelgewicht: 7.26 Pfund (ca. 3.29 kg)
- Produktabmessungen: 2.8"T x 8.3"B x 10.25"H (ca. 7.1 cm T x 21.1 cm B x 26.0 cm H)
- Anzeigetyp: LCD
- Farbe: Schwarz
- Anzahl der Kanäle: 8 (default GMRS channels)
- Besondere Merkmale: DB-9 female connector, Full duplex
- Frequenzbereich: GMRS
- Bandtage: 12 Volt (DC)
- Wasserbeständigkeit: Nicht wasserfest
- Kompatible Geräte: Himbeer-Pi

Image 8.1: Physical dimensions and key connection points of the RT97S repeater.
9. Garantie und Support
Retevis provides comprehensive warranty and support for the RT97S GMRS Repeater:
- Garantiezeit:
- 2 Jahre Garantie auf das Funkgerät.
- 1-year warranty for accessories.
- Rückgaberecht: 30 Tage Rückgaberecht ohne Angabe von Gründen.
- Service nach Ablauf der Garantie: Maintenance services are still offered beyond the warranty period; buyers are responsible for associated costs.
- Kundendienst: For any inquiries or support needs, please contact Retevis via Amazon email. Responses are typically provided within 12 hours.