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.
Features
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)
Applications
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 Definition:
| 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 |
Useful Link:
AT Command for UHF/VHF Walkie Talkie radio module
