The SR150U is the industry's first compact, high-power wireless voice intercom and long-range data transmission module.
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The SR150U is the industry's first compact, high-power wireless voice intercom and long-range data transmission module. Based on automatic power tracking technology, it maintains consistent transmission power across the entire frequency band.
The module integrates a high-performance RF transceiver chip, microcontroller, and RF power amplifier. External controllers can set module parameters and control transmission/reception through standard UART (TTL level) communication. The module only requires an external antenna, microphone, and audio amplifier to form a complete intercom or data radio station. Module parameters can be saved after power off, and no external microcontroller is needed for simple applications.
Digital signal processing-based FM demodulation technology
Automatic power adjustment technology for consistent transmission power across the frequency band
Frequency range: 400MHz - 480MHz
Selectable frequency steps: 5K/6.25K/12.5K/25K
RF output power: 5W/2.5W selectable
Voice encryption (frequency hopping) function: (7 options)
SMS messaging (remote control, data transmission) capability
Received Signal Strength Indicator (RSSI) query
DTMF transmission and demodulation function (available upon custom request)
Built-in CTCSS (38 groups) and CDCSS (83 groups) encoding/decoding, supports normal and inverse phase
Automatic tail tone elimination
Digital volume control: adjustable (levels 1-9)
Voice-activated hands-free sensitivity: adjustable (levels 0-8)
Squelch level: adjustable (levels 0-8)
Microphone sensitivity adjustment: (levels 1-8)
Transmission timeout (TOT): settable 1-9 minutes
High receiving sensitivity: -121dBm
Ultra-low power consumption (sleep mode): 0.1µA
Operating voltage range: 5V-8.4V, recommended 7.4V-8.4V, power supply must provide over 2.5A current
Dimensions: 32.5 × 52 × 3.5mm
Reference communication distance: 5-8 kilometers in open areas (actual communication distance depends on transmission power, receiving sensitivity, antenna length/placement/matching, usage environment, and other factors)
Portable, vehicle-mounted intercom and paging systems
Long-range wireless remote control and data transmission systems
Elevator intercom, wilderness communication, drones, and other applications requiring ultra-long-distance communication
| Pin name | No | function description |
| GND | 1,2,3,4,5,6 | GND |
| VBAT | 78 | Power supply positive(+5.5to +8.4V) Recommended operating voltage+74 to+84V |
| GND | GND | |
| PD | 10 | Control pin of the module power supply. O power off;1:power on The high-level module must be connected to work |
| AF OUT | 11 | Audio output |
| SQ/SPK-EN | 12 | Receiving status indication.0 receiving 1:no reception |
| TX-LED | 13 | Transmit status indication; Active high |
| HL | 14 | Transmit power selection, Suspended: high power;0:low power |
| PTT | 15 | Transmit/receive Control pin,1=receive,0=transmit |
| MIC | 16 | MIC input(audio input) |
| RXD | 17 | Asynchronous serial interface(receiving data interface) |
| TXD | 18 | Asynchronous serial interface( transmitting data interface) |
| GND | 19 | GND |
| VCC | 20 | The power supply voltage of the programming port, floating |
| NC | 21,22,23,24,25 | programming port, floating |
| ANT | 26 | antenna port, RF input/output |
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The SR150U is the industry's first compact, high-power wireless voice intercom and long-range data transmission module.
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