890-900Fréquence Mhz 6 7 8Bande passante Mhz COFDM DVB-T récepteur vidéo sans fil canal spécial personnalisé pour éviter les perturbations de la chaîne de télévision locale

j'achèterai COFDM-907Vidéo T – l'audio, Émetteur – Récepteur HD 1080P. Je vais l'utiliser pour FPV dans les voitures RC. Mais,
1.. La caméra PTZ HD 1080p fonctionnera-t-elle?
2.. Pouvez-vous régler la fréquence de fonctionnement entre 890 – 900MHz?
3.. Pouvez-vous rendre la bande passante de travail supérieure à 6 MHz?
4.. Jusqu'à quel point (km.) est-ce que ça passe entre les bâtiments de la ville?
5.. Le microphone est-il connecté?

Certains clients souhaitent utiliser notre récepteur de télévision numérique comme récepteur vidéo sans fil COFDM, la fréquence DVB-T normale est de 170 à 860Mhz. Afin d'éviter les interférences des chaînes de télévision locales, ils espèrent que la fréquence fonctionnera à 890Mhz et 900Mhz. Dans cette vidéo, nous pouvons vous montrer que nous modifions deux fréquences spéciales à une bande passante de 6Mhz. il fonctionne bien et reçoit le signal de l'émetteur vidéo sans fil COFDM-907T. Nous pouvons également modifier jusqu'à 930Mhz au niveau de l'émetteur et du récepteur.

Merci

Émetteur-récepteur vidéo-audio COFDM-907T (1080P HD) – Customer Inquiry and Technical Clarification

A customer has expressed interest in purchasing the COFDM-907T Video–Audio Transmitter–Receiver HD 1080P system for use in FPV (Vue à la première personne) applications with RC cars. This type of system is commonly used in ground-based projects where stable, low-latency video transmission is required. Below are the customer’s key questions, followed by our detailed technical answers and additional clarifications regarding frequency range and bandwidth customization.

Customer Questions and Answers

1. La caméra PTZ HD 1080p fonctionnera-t-elle?
Oui, the COFDM-907T supports full HD 1080P video contribution. The important detail we must confirm is the type of video connector used by the PTZ camera. Our transmitter currently supports both HDMI et CVBS (vidéo composite) entrées, which cover the most common camera interfaces.

If the customer’s PTZ camera outputs via HDMI or CVBS, it can be connected directly. toutefois, if the PTZ camera requires remote control of its pan, inclinaison, and zoom functions from the receiver side, then a bi-directional data link is necessary. This means the system must not only send video from the car to the ground station but also allow return control signals from the ground to the transmitter. Such a setup is possible but will increase cost and complexity. If the requirement is simply to view video without PTZ control, then the standard one-way COFDM-907T system is sufficient.

2. Can you set the operating frequency between 890–900 MHz?
Normalement, COFDM wireless video systems, especially those compatible with DVB-T standards, are designed to operate in the 170–860 MHz range. toutefois, we understand that in some regions, customers want to avoid interference from local digital TV channels or other devices operating in the lower bands.

Pour cette raison, we can provide a custom modification to extend the supported frequency range. The COFDM-907T can be adjusted to work up to 930 MHz, meaning that 890–900 MHz is fully achievable. This provides a clean operating band outside of typical DVB-T usage, reducing the chance of interference and improving stability in urban environments.

3. Can you make the working bandwidth over 6 MHz?
Oui, our COFDM transmitters and receivers support multiple bandwidth options, typically including 6 MHz, 7 MHz, et 8 MHz. Par défaut, many systems are configured at 6 MHz, but we can adjust the bandwidth to suit customer requirements.

Wider bandwidth (par ex., 7 ou 8 MHz) autoriser higher data rates, which can improve video quality and support higher resolution or frame rates. toutefois, wider bandwidth also requires more available spectrum and may be more susceptible to interference. For professional applications like HD FPV video, a 6–8 MHz bandwidth is common and well-supported.

4. Jusqu'à quel point (km) est-ce que ça passe entre les bâtiments de la ville?
Dans environnements urbains, wireless video transmission is much more challenging compared to open line-of-sight (LA) conditions. Buildings, murs, and other obstacles create a sans visibilité directe (NLOS) environnement, provoquant une réflexion, absorption, et interférence.

While the COFDM-907T can reach 10–15 km under LOS conditions, the range is naturally reduced in a city setting. Based on our field tests, when operating between buildings, des arbres, et les rues, the effective range is around 1 km in NLOS conditions. This is still stable enough for most FPV and RC car applications within a city. For improved range, using higher-gain antennas or selecting less congested frequency bands can help.

5. Le microphone est-il connecté?
Oui. Both HDMI and CVBS inputs on the COFDM-907T support audio and video together. Pour HDMI, digital audio is embedded in the same signal as the video, while for CVBS, the system uses RCA connectors that carry composite video and audio. This means if the camera has a built-in microphone, the audio will be transmitted along with the video to the receiver.

Frequency Customization Example: 890–900 MHz Operation

Some clients have requested that our digital TV receiver be used as a COFDM wireless video receiver at frequencies outside the normal DVB-T allocation. Par défaut, DVB-T operates from 170–860 MHz. toutefois, to avoid interference with local TV broadcasting, some users prefer to operate at 890–900 MHz or even higher.

In response, we have successfully demonstrated that both the transmitter and receiver can be modified to work at 890 MHz et 900 MHz using 6 MHz de bande passante. Dans notre vidéo de test, the system worked smoothly at these frequencies and successfully received video from the COFDM-907T transmitter. en outre, we can extend the supported frequency range up to 930 MHz, giving users more flexibility in selecting a clean operating channel.

Conclusion

The COFDM-907T is a versatile and reliable wireless video transmitter–receiver system suitable for HD 1080P applications in FPV RC cars and other mobile projects. It supports multiple video input formats, adjustable bandwidths, and customizable frequency ranges up to 930 MHz. While line-of-sight range is significantly greater, in urban environments it can still provide stable transmission up to 1 km, making it practical for city-based FPV projects. En outre, both video and audio (microphone) signals are supported, ensuring a complete transmission solution.

By addressing the customer’s questions, we can confirm that the COFDM-907T is a strong match for the project, and frequency customization ensures that interference can be avoided even in complex environments.