高清数字无线图传发射机ST220内置编码板、COFDM调制模块、小尺寸PA功率放大模块，整机采用CNC铝合金壳体，体积小，重量轻，传输分辨率高，发射距离远。
- COFDM图传调制。
- H265/H264视频编码，默认最高支持1080P/I @60fps。
- AES256加密。
- 支持非视距高速移动传输。
- 中心频点、无线带宽、传输码流等均可配置。
ST220主要技术规格
| 接口 | |
| 高清视频输入 | 标准HDMI接口 |
| 标清视频输入 | 4PIN 1.5mm间距连接器 |
| 单向透传数据串口 | 3PIN 1.5mm间距连接器，默认出货为TTL3.3V电平。也可出货时指定设置为标准RS232电平。 |
| 配置串口 | 4PIN 1.5mm间距连接器，TTL3.3V。可连接SconA/SconB/SconC配参面板，也可连接PC或其它上位机 |
| 电源输入 | XT30PW-M连接器 |
| 天线接口 | SMA外螺纹内孔 |
| 无线调制发射 | |
| 无线调制 | COFDM |
| IFFT模式 | 2K |
| 无线带宽 | 1MHz~8MHz可调，1KHz步进 |
| FEC | 1/2, 2/3, 3/4, 5/6, 7/8 |
| Guard interval | 1/32, 1/16, 1/8, 1/4 |
| Constellation | QPSK, 16QAM, 64QAM |
| 无线码流 | 0.5Mbps to 31.67Mbps |
| 工作频段 | 可选的工作频段： 300~360MHz；350~400MHz；450~500MHz；520~560MHz； 580~620MHz；680~720MHz；820~860MHz。 200~860MHz之间的其它工作频段可定制。中心工作频点可配置，步进1KHz。 |
| 发射功率 | 1W(30dBm)或2.5W(34dBm) |
| 音视频处理 | |
| 支持视频输入 | 默认单路视频输入编码发射：高清或标清。上电后自动检测视频输入。如果同时接入，设备默认首选HDMI输入，也可更改配置为首选AV输入。 可选双路视频输入同时编码发射。 |
| 支持的视频格式 | 1080@60P, 1080@50P, 1080@30P, 1080@25P, 1080@24P, 1080@60I, 1080@ 50I, 1080@30I, 720@60P, 720@50P, 720@30P, …… 720*480 60I(NTSC), 720*576 50I(PAL) |
| 视频编码 | H265或H264 |
| 音频输入 | HDMI嵌入式音频或模拟音频 |
| 音频格式 | AAC, 16bit, stereo, 32Kbps |
| 加密方式 | AES256 |
| 尺寸 | 104.5*50*27mm(不包括伸出的接口器件、外壳固定孔位) |
| 重量 | 小于140克 |
| 供电与功耗 | DC 12V供电（11~13V） 1W发射功率整机功耗小于15W，2.5W发射功率整机功耗小于23W。 |
ST220发射机可配套SR300接收机、SR110接收机、SR200接收机使用。ST220发射机与SR300接收机点对点无线传输H265视频时，视频延迟一般在200~300ms之间(未包含相机自身延迟)。ST220发射机搭配SR110接收机，H264低延时模式传输时，视频延迟一般在50~130ms之间(未包含相机自身延迟)。
ST220发射机接口信号
ST220发射机
AV输入接口：
标清输入接口，4PIN 1.5mm间距座子，音频支持Mic in或Line in输入(出厂时指定)。可通过配参面板设定PAL或NTSC制式。
| PIN | 说明 |
| AL | 音频输入左声道 |
| AR | 音频输入右声道 |
| GND | 信号地 |
| AV | 模拟视频输入 |
CFG接口：
配置串口(Control-uart)，4PIN 1.5mm间距座子，TTL 3.3V电平。其中的5V信号用于对接配参面板时给配参面板供电。
Data接口：
单向透传数据串口(Data-uart)，该串口数据会通过COFDM无线链路单向传输到对应接收机的数据串口上。3PIN 1.5mm间距座子，默认出货为TTL 3.3V电平，也可在出货时指定设置为标准RS232电平串口。
工作指示灯：
| 标识 | 指示灯 | 说明 |
| P | Power LED | 电源工作指示灯，红色，上电后常亮。 |
| T | Link LED | 无线发射指示灯，绿色，发射数据时闪烁 |
Overview
The ST220 HD Digital Wireless Image Transmission Transmitter is a compact, high-performance device designed to deliver reliable wireless video transmission for professional applications. By integrating a built-in COFDM modulation module, an H.265/H.264 video encoding board, and a small-size PA power amplifier module, the ST220 achieves stable long-distance video transmission in a rugged, lightweight package.
The transmitter adopts a CNC aluminum alloy housing, ensuring durability, excellent heat dissipation, and lightweight design suitable for airborne applications. With support for high-definition (HD) and standard-definition (SD) video inputs, configurable transmission parameters, and multiple frequency bands, the ST220 offers a flexible solution for drone operations, field broadcasting, surveillance, and other wireless video applications.
Paired with receivers such as the SR300, SR110, or SR200, the ST220 enables real-time video transmission with selectable latency modes. Depending on configuration, latency can be reduced to as low as 50–130 ms for critical low-delay applications or maintained at 200–300 ms in high-compression modes for bandwidth optimization.
Key Features
- COFDM Modulation: Ensures robust, stable transmission in both line-of-sight (LOS) and non-line-of-sight (NLOS) environments.
- Video Encoding: Supports H.265 (HEVC) or H.264 (AVC) encoding, with default transmission up to 1080P/I @ 60 fps.
- Encryption: Built-in AES-256 encryption guarantees secure video and data links.
- Flexible Video Input: Standard HDMI input for HD signals, and CVBS/analog input for SD video sources. Automatic input detection with HDMI preference, or configurable for AV priority. Optional dual-input encoding available.
- Transparent Data Transmission: One-way transparent serial data channel (UART), configurable for TTL 3.3V or RS232 levels, enabling simultaneous data communication along with video.
- Customizable Frequency: Wide range of selectable frequency bands between 200–860 MHz, with configurable center frequency and fine-tuning step of 1 kHz.
- Transmission Power Options: Selectable 1 W (30 dBm) or 2.5 W (34 dBm) RF output for extended range.
- Audio Support: Embedded HDMI audio or analog stereo audio input (Mic/Line-in selectable).
- Rugged Design: CNC-machined aluminum shell provides heat dissipation, durability, and compactness.
- Compact & Lightweight: Size 104.5 × 50 × 27 mm, weight less than 140 g, making it suitable for drone payloads.
- Configurable Parameters: Modulation settings (bandwidth, coding rate, constellation), working frequency, and FEC ratios are fully adjustable via configuration tools.
- Low Latency Modes: When paired with compatible receivers, latency can be as low as 50 ms, suitable for FPV, drone piloting, or real-time monitoring.
Technical Specifications
Wireless Modulation & Transmission
- Modulation: COFDM
- Bandwidth: Adjustable from 1 MHz to 8 MHz
- Constellation: QPSK, 16QAM, 64QAM
- FEC (Forward Error Correction): 1/2, 2/3, 3/4, 5/6, 7/8
- Guard Interval: 1/32, 1/16, 1/8, 1/4
- Configurable coding ratio: 2K
Working Frequency
- Standard Bands:
- 300–360 MHz
- 350–400 MHz
- 450–500 MHz
- 520–560 MHz
- 580–620 MHz
- 680–720 MHz
- 820–860 MHz
- Customization: Other frequencies from 200–860 MHz available upon request
- Step size: 1 kHz configurable center frequency
Transmit Power
- 1 W (30 dBm) or 2.5 W (34 dBm) selectable
Video & Audio Processing
- Video Inputs: HDMI (HD) and CVBS analog (SD)
- Supported Formats:
- 1080P/I @ 60/50 fps
- 720P @ 60/50 fps
- PAL (720×576 @ 50i)
- NTSC (720×480 @ 60i)
- Video Encoding: H.265 / H.264
- Audio Input: HDMI embedded or analog audio (Mic-in/Line-in selectable)
- Audio Format: AAC, 16-bit stereo
Interfaces
- HDMI Input: Standard HDMI port
- SD Video Input: 4-pin, 1.5 mm pitch connector
- Transparent Data UART: 3-pin, TTL 3.3V (default), optional RS232
- Configuration Port: 4-pin, TTL 3.3V, compatible with parameter panel or PC connection
- Power Input: XT30PW-M connector (DC 12V, 11–13V range)
- Antenna: SMA connector (male, inner pin)
Indicators
- Power LED: Red, always on when powered
- Link LED: Green, blinks during wireless transmission activity
Power & Consumption
- Supply Voltage: DC 12V (11–13V)
- Consumption:
- ≤15 W @ 1 W RF output
- ≤23 W @ 2.5 W RF output
Physical
- Size: 104.5 × 50 × 27 mm (excluding connectors and mounting points)
- Weight: <140 g
Performance with Receivers
- ST220 + SR300 Receiver:
- Point-to-point H.265 transmission
- Typical latency: 200–300 ms (excluding camera delay)
- ST220 + SR110 Receiver:
- Low-latency H.264 transmission mode
- Typical latency: 50–130 ms (excluding camera delay)
- ST220 + SR200 Receiver:
- Standard COFDM reception with configurable settings
Applications
The ST220 HD digital wireless image transmission transmitter is designed for professional video transmission in demanding environments. Its combination of compact design, high-resolution support, and configurable transmission options make it suitable for:
- Industrial & Commercial UAVs: Long-distance wireless video backhaul for drones in mapping, inspection, and surveying.
- Broadcast & Media: Wireless camera links for live events, sports, and news gathering.
- Security & Law Enforcement: Mobile video transmission for surveillance vehicles, field operations, or public safety drones.
- Search & Rescue Operations: Reliable video feeds in disaster zones or remote areas.
- Defense & Reconnaissance: Tactical UAV or ground unit video transmission with secure AES-256 encryption.
Optional Configurations
- Frequency Bands: Customizable bands from 200–860 MHz.
- Data Port: Configurable as TTL (default) or RS232.
- Video Input Priority: HDMI or AV (factory-configurable).
- Dual-Video Input Mode: Optional dual-input encoding and transmission.
- Transmit Power: 1 W (low power) or 2.5 W (high power).
- Receiver Compatibility: Compatible with SR110, SR200, SR300 models depending on latency and resolution needs.
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