Weide Technology Co,. Ltd

SM333R-RI FPV Receiver Module
(3.3GHz Toggle Switch Control)
The SM333R-RI delivers low-latency CVBS video reception across 3.17-3.47GHz with hardware-controlled frequency selection. Featuring robust anti-interference performance and toggle-switch channel programming, it's ideal for FPV drone racing, long-range applications, and professional aerial systems.
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1. Technical Specifications
Electrical Characteristics
Parameter Specification Supply Voltage 5.0V DC ±5% Current Consumption 420mA ±30mA Environmental Ratings
Parameter Specification Operating Temperature -10°C to +65°C Storage Temperature -30°C to +85°C Operating Humidity ≤85% RH (non-condensing) RF Performance
Parameter Specification Frequency Range 3170 - 3470 MHz Channels 16 (2 bands × 8 channels) Band A Frequencies 3330/3350/3370/3390/3410/3430/3450/3470 MHz Band B Frequencies 3170/3190/3210/3230/3250/3270/3290/3310 MHz Demodulation FM/PLL IF Frequency 480 MHz LO Stability ±200 kHz Receiver Sensitivity -95 dBm ±5 dBm RSSI Slope 22 mV/dBm Video Performance
Parameter Specification Output Level 1V ±0.2Vp-p Signal Polarity Negative S/N Ratio ≥38 dB Differential Gain ≤ ±5% Differential Phase ≤ ±5° Physical Specifications
Parameter Specification Dimensions (L×W×H) 37 × 26.3 × 4.8 mm Weight 5.2 g Pin Pitch 2.54 mm ________________________________________
2. Pin Functions
Primary Connector:
Pin Label Function 1 +5V Power Input (5V DC) 2 S1 Band Selection (0=Band B, 1=Band A) 3 GND Ground 4-5 NC No Connection 6 Video CVBS Video Output 7-9 CS1-CS3 Channel Selection (Binary Control) 10 RSSI Analog Signal Strength Output 11-13 GND Ground 14 ANT IN Antenna Input (50Ω) 15 GND Ground Test Pads (Debugging):
Pad Connection 2 S1 7-9 CS3-CS1 0 GND ________________________________________
3. Channel Selection
Control Logic (TTL Levels):

S1 (Band Select): High=Band A, Low=Band B


CS3-CS1 (Channel Select): 3-bit binary input

Frequency Mapping:
Channel CS3 CS2 CS1 S1 Frequency A1 0 0 0 1 3330 MHz A2 0 0 1 1 3350 MHz A3 0 1 0 1 3370 MHz A4 0 1 1 1 3390 MHz A5 1 0 0 1 3410 MHz A6 1 0 1 1 3430 MHz A7 1 1 0 1 3450 MHz A8 1 1 1 1 3470 MHz B1 0 0 0 0 3170 MHz B2 0 0 1 0 3190 MHz B3 0 1 0 0 3210 MHz B4 0 1 1 0 3230 MHz B5 1 0 0 0 3250 MHz B6 1 0 1 0 3270 MHz B7 1 1 0 0 3290 MHz B8 1 1 1 0 3310 MHz ________________________________________
4. RSSI Output Reference
Typical values @ 5V supply (E4421B signal source)
Signal 3330-3390MHz 3410-3470MHz 3170-3230MHz 3250-3310MHz -136dBm 0.75-0.77V 0.79-0.87V 0.66-0.69V 0.67-0.71V -95dBm 0.92-0.95V 0.96-1.09V 0.81-0.83V 0.82-0.90V -70dBm 2.25-2.31V 2.31-2.45V 2.11-2.14V 2.16-2.23V -40dBm 2.77-2.79V 2.78-2.80V 2.78-2.83V 2.78V Full tables available in datasheet. Values may vary ±3% across production batches.
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5. Application Circuit
Typical Implementation:

Power Regulation:


LM7805 converts 7-36V input to stable 5V


Support components:


C1/C3: 47μF/16V electrolytic capacitors


C2/C4: 10nF ceramic capacitors


Channel Control:


Toggle switches or GPIO from MCU (e.g., FM8PB513) drive:


S1 (Band select)


CS1-CS3 (Channel select)


Video Path:


Direct CVBS output to display/goggles


RSSI Monitoring:


Analog voltage output for signal strength analysis

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6. Critical Usage Notes
⚠️ POWER & INSTALLATION

Voltage Verification:


Confirm 5V ±5% input polarity before powering on


Antenna Selection:


Use antennas with VSWR ≤1.5 and gain ≥3dBi for optimal range


Thermal Management:


Maintain ambient temperature ≤65°C with adequate ventilation

⚠️ OPERATIONAL GUIDELINES

Band A (3330-3470MHz) recommended for minimal interference


Avoid frequency drift by stabilizing operating temperature


RSSI output requires 10kΩ minimum load impedance

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Compliance & Support:

FCC Part 15.249/CE EN 300 328 compliant


RoHS 3 certified


Full datasheet: [SM333R-RI_DS_v1.4.pdf]

Specifications subject to change without notice. Contact technical support for custom integration queries.