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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 design, work temperature: -40~+70℃;
Several kinds of interfaces for choice: RS-232, TTL, RS-485;
DATA Format: 8N1/8E1/8O1( Customized )
Antenna Impedance: 50Ω (SMA Customized)
Application:
1)Remote reading system of water, electric and gas supply;
2)Building Automation, security & protection, access control system;
3)Wireless calling system;
4)Spot management, station management;
5)RF transmitter Wireless electronic display screen and queuing machine;
6)Electronic bus station and intelligent traffic;
7)Alarm systems.
Specification:
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 index:
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 index:
RF Output: 500mW
Adjacent channel power ratio: ≥70dB
Modulation Distortion: ≤3%
Modulation Sensitivity: 5mV
Current: ≤300mA
Size: 70*46*8mm
Interfaces definition:
| 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 of RS-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 |
Notice:
1) Use the min. grain wave and high anti-jamming switch power or batteries;
2)The power capacity must meet D.C. 5~12V,more than 800mA output current
3)The space between the experiments Radio should be more than 5m. The antenna should span on the high to increase the distance of electric wave. It is important for using shortwave communication equipment in the city.
4) After connecting the antenna to the Radio, the space between the Radios should more than 10m, so avoid signal backup.
5)The antenna plywood should nip in the connection inside the antenna, but not nip the antenna projectile, so avoiding the performance of the antenna.
6) High frequency cable don’t come down directness, circle a circuit and fix up it on the frame for the best.
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