4K HDMI 902-928Mhz 915Mhz COFDM wireless video transmitter and receiver with BDC frequency down converter 2-5-10 watts power amplifier

4K HDMI 902-928Mhz 915Mhz COFDM wireless video transmitter and receiver with BDC frequency down converter

BDC Frequency Downconverter

To enable compatibility with our receiver, a dual-channel BDC frequency down converter is required. The transmitter operates at 902–928 MHz (centered at 915 MHz), while the receiver’s RF input supports 170–860 MHz by default. Before connecting the transmitter output to the receiver, the down converter shifts the frequency from 902–928 MHz down to 687–713 MHz, ensuring proper signal reception. This solution accommodates the transmitter’s broad 170–3500 MHz range and maintains signal integrity without requiring modifications to the transmitter or receiver hardware. The dual-channel design allows simultaneous processing of two signals for flexible deployment.

The frequency down converter here is 5V DC.

Although the transmitter module supports a wide 170–3500 MHz range, the power amplifier is designed for a 30 MHz bandwidth, and the antenna is optimized for a 50 MHz range to maximize transmission distance and signal strength. Once the transmitter is finalized with a power amplifier and a custom antenna tailored to the customer’s frequency requirements, the operating frequency cannot be freely modified across the full 170–3500 MHz range. The finished product is optimized for the specified frequency band to ensure reliable performance and adherence to design specifications.

Dimension and Weight

Insert content here…

Accessory

FAQ

Q: What is the 5 watt cofdm video transmitter input voltage range? Can it run on 12V DC?
A: 12V

Q: The frequency down-converter on the RX — is it built into the receiver unit, or a separate external module? Does it add any latency?
A: We recommend using an external down-converter module. This approach offers several advantages:

1. It avoids increasing or modifying the size of the receiver enclosure.
2. External components are easier for users to replace or upgrade.
3. If the transmitter frequency changes, only the down-converter needs to be replaced, while the receiver can continue to be used.

The down-converter is designed to operate with negligible latency, so it does not introduce any noticeable delay in normal use.

Q: Does the COFDM wireless video receiver still output HDMI like the standard Vcan1726 if I choose 4K HDMI transmitter?
A: Yes, the receiver provides HDMI output similar to the standard Vcan1726. It supports up to 1080p at 60 FPS and 4K at 30 FPS. However, because the transmitter input signal may vary, the receiver requires switching via the parameter configuration board to match the input format. At present, the receiver cannot output 4K HDMI and 1080p HDMI simultaneously—manual switching between modes is required.

Q: The US 902-928MHz ISM band is only 26MHz wide. What video resolution and bitrate can I expect?
A: The transmitter supports video resolutions up to 4K at 30 FPS and 1080p at 60 FPS.

The actual video bitrate is adaptive and depends on the current wireless configuration and channel conditions. You can view the real-time bitrate on the configuration display panel when it is connected to the transmitter.

COFDM TX V xx

For example, under the default factory settings (with a wireless bandwidth of 4 MHz), the adaptive system typically delivers a video bitrate of approximately 3.12 Mbps.