Model Number: SG-M304-2
Brand Name: SAFE GUARD
Key Specifications/Special Features:
Introduction:SG-M304 is a module of DATA transmission integrated with voice communication. Specially designed for automatic industry with high reliability and stability. Provide voice transmission channel, can be connected to a microphone or loudspeaker directly, very easy to extend its functions and applications by the clients. And moreover, we are always ready for your OEM.Features:
- Use TCXO and digital PLL advanced technologies, high stability
- Integration of transceiver, both digital and analog signals can be send and switch quickly
- Steady outsell, good hidden and stronger anti-interference
- Industrial designes, work temperatures: -40~70℃
- Several kinds of interfaces for choice: RS-232, TTL, RS-485
- DATA format: 8N1/8E1/8O1 (customized)
- Antenna impedance: 50Ω (SMA customized)
Applications:
- Remote reading system of water, electric and gas supply
- Building automation, security & protection, devices monitoring and access control system
- Wireless calling system
- Spot management, station management
- RF transmitter Wireless electronic display screen and queuing machine
- Electronic bus station and intelligent traffic
- Alarm systems
Specifications:
- Frequency: VHF/UHF ( 223-235MHz )
- Power: 500mW
- Frequency stability: ± 2.5ppm
- Mode: half-duplex
- Channel spacing: 25KHz
- Voltage: DC 12V ( Customized )
- Transmission distance: 2km
Receiver indicator:
- Usable sensitivity: ≤0.25μV (12dB SINAD)
- Adjacent channel selectivity: ≥70dB
- Spurious response Immunity: ≥ 65dB
- Adjacent channel power ratio: ≥70dB
- Audio output: 0.5W(8Ω, 10% Distortion)
- Distortion: ≤3%
- Current: ≤ 50mA
Transmitter indicator:
- RF output: 500mW
- Adjacent channel power ratio: ≥70dB
- Modulation distortion: ≤3%
- Modulation sensitivity: 5mV
- Current: ≤300mA
- Size: 70*46*8mm
Complete set of equipment:
- One module of SG-M304
- One antenna
|
Name |
Description |
Level |
Remark |
1 |
VCC |
DC |
12 V |
DC 12V ( as good in range 7.5~15V), or customized |
2 |
3 |
GND |
GND |
---- |
------------- |
4 |
5 |
A(TXD) |
RS-485 A or TXD of RS-232 |
|
Either RS-485 or RS-232 |
6 |
B(RXD |
RS-485 B or RXD ofRS-232 |
|
7 |
PTT |
Transmit control |
TTL |
Low level validity |
8 |
MIC |
Audio input |
--- |
Recommend 1K-2K, -27dB sensitivity of microphone |
9 |
SP |
Audio output |
--- |
8Ω 0.5 |
10 |
SQ |
Receiving indication |
TTL |
High-level |