VTX 8.2G-4W Video Transmitter

1. Main Specifications

ParameterSpecificationModel No.VTX_8.2G-4WProduct TypeAnalog audio and video transmitter (VTX)Operating Frequency Band7.0 to 8.2 GHzOutput Power4W maximum (36 dBm)Selectable Power Levels200mW / 2W / 4W (Level 1 / 2 / 3)Total Channels56 CH (7 bands x 8 channels)Frequency BandsA, B, E, F, R, U, OModulationWideband FMVideo FormatNTSC / PALVideo Bandwidth0 to 8.0 MHzVideo Input Level0.8 to 1.2 Vp-p (1.0 Vp-p typical)Video Input Impedance75 ΩOutput Impedance50 ΩAntenna ConnectorRP-SMAPower and Video Connector5 pin harness: GND, 5V OUT, R-OUT, VIDEO, DC INOperating Voltage16 to 30V DC (24V typical)Supply Current1.2A typicalOperating Temperature-10 to +100°CDimensions36 x 48 x 15 mm (overall, including antenna connector)Net Weight29g (excluding antenna)

2. Key Features

• • 7.0 to 8.2 GHz operation: Seven overlapping bands cover 7000 MHz to 8210 MHz, giving a total of 56 switchable channels for interference avoidance.
• • 4W RF output: Three selectable power levels of 200mW, 2W and 4W, with the module starting at the lowest level after power up.
• • Wideband FM audio and video: NTSC and PAL support, 75 Ω video input impedance and 0 to 8.0 MHz video bandwidth.
• • Camera power output: A 5V OUT pin on the harness can supply power to the camera.
• • Wide DC input: 16 to 30V DC operating range at 1.2A typical supply current.
• • Compact and light: 36 x 48 x 15 mm overall and 29g excluding the antenna.
• • Mechanical design: Rear cooling fan, four corner mounting holes with gold plated inserts, and a top mounted RP-SMA connector.
• • Thermal protection: Built in PTC temperature sensor with automatic power reduction and automatic recovery.
• • Button and LED control: Channel, band and power are set from two buttons, with red, blue and green LED feedback.

3. Electrical Ratings (Min. / Typ. / Max.)

No.ParameterMin.Typ.Max.Unit1Output Impedance-50-Ω2Output Power23.531.536dBm3Operating Voltage162430V4Supply Current-1.2-A5Operating Temperature-10-100°C6Video Bandwidth0-8.0MHz7Video Input Level0.81.01.2Vp-p8Video Input Impedance-75-Ω

4. Frequency and Channel Table (MHz)

BandCH1CH2CH3CH4CH5CH6CH7CH8A (FR1)70007025705070757100712571507175B (FR2)72007225725072757300732573507375E (FR3)74007425745074757500752575507575F (FR4)76007625765076757700772577507775R (FR5)78007825785078757900792579507975U (FR6)80008025805080758100812581508175O (FR7)82108110791078107610741072107010

5. Controls, LED Display and Protection

POWER button

• • Short press: cycles power levels 1 / 2 / 3 (200mW / 2W / 4W). The module defaults to the lowest power level after power up.
• • The red LED flashes slowly, and the number of flashes matches the current power level.
• • Press and hold for 2 seconds: enters PPT mode. Press and hold again for 2 seconds to exit.
• CH button
• • Short press: cycles channels 1 to 8. The green LED flashes a number of times matching the current channel, with pauses between flash sequences.
• • Press and hold for 2 seconds: enters band adjustment mode. Short press then switches between bands A / B / E / F / R / U / O. The blue LED flashes the current band, while the green LED flashes rapidly as a prompt.
• • The module exits band adjustment mode and returns to the normal channel adjustment interface automatically if no button operation is performed within 30 seconds.
• LED indicators
• • R-LED (red): Power level
• • B-LED (blue): Frequency band
• • G-LED (green): Channel number
• Overheating automatic protection
• • A built in PTC temperature sensing resistor monitors the PCB main board.
• • When the board temperature exceeds 120°C, the output power automatically drops to Level 1 (200mW) and the RGB tri-color indicator flashes rapidly as an alarm.
• • When the temperature falls back to 100°C, the module automatically restores the power level set before.
• Safety warning
• • Do not power on the module without a frequency matched antenna installed, otherwise the RF module will be burned out immediately.