Shenzhen dingshen Industrial Co., Ltd
Shenzhen dingshen Industrial Co., Ltd
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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 designees, work temperature: -40~+70°C;
Several kinds of interfaces for choice: RS-232, TTL, RS-485;
Application:
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;
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
Transmitter indicator:
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 |
6 Complete set of equipment:
1. One module of KP-RM304;
2. 10 pin flat connector;
3. A whip antennas ( about 10cm)
7 Antenna appearance structure:
Many appropriative antennas for low power RF modules are selected to meet different user’s antenna configuration. Please ask our Sales office for further information about the antenna’s dimension and performance. The main options of antennas are exterior flabelliform rubber antenna with helical SMA joint, small osculum antenna, small rod antenna and elbow antenna. If the user has special demands on antennas, we can design and produce individually.