Shenzhen dingshen Industrial Co., Ltd

Shenzhen dingshen Industrial Co., Ltd

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500mW FSK Wireless Modem VHF UHF Transceiver Module Long Range

500mW FSK Wireless Modem VHF UHF Transceiver Module Long Range

  • 500mW FSK Wireless Modem VHF UHF Transceiver Module Long Range
500mW FSK Wireless Modem VHF UHF Transceiver Module Long Range
Product Details:
Place of Origin: China
Brand Name: Ding Shen
Model Number: DS-RM304
Payment & Shipping Terms:
Minimum Order Quantity: 1 Set
Price: Negotiation
Packaging Details: export standard packing
Delivery Time: 3-7 days
Payment Terms: T/T
Supply Ability: 1000PCS per month
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Detailed Product Description
Frequency:: VHF/UHF ( 223-235MHz ) Frequency Stability::: ± 2.5ppm
Size:: 70*46*8mm Power::: 500mW
Mode::: Half-duplex Interface:: RS-232, TTL, RS-485
High Light:

Modem VHF UHF Transceiver Module


FSK Wireless UHF Transceiver Module


Long Range UHF Transceiver Module

500mW FSK Wireless DATA Transceiver VHF / UHF Wireless Data Module


DS-RM304 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.




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;

DATA Format: 8N1/8E1/8O1( Customized )

Antenna Impedance: 50Ω (SMA Customized)




Remote reading system of water, electric and gas supply;

Building Automation, security & protection, devices monitoring and access control


Wireless calling system;

Spot management, station management;

RF transmitter Wireless electronic display screen and queuing machine;

Electronic bus station and intelligent traffic;

Alarm systems.




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


500mW FSK Wireless Data Modem VHF / UHF Transceiver Module Long Range


Interfaces definition:


  Name Description Level Remark

12 V


DC 12V ( as good in range 7.5~15V), or customized
3 GND GND --------- -----------------
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.


500mW FSK Wireless Data Modem VHF / UHF Transceiver Module Long Range

Contact Details
Shenzhen dingshen Industrial Co., Ltd

Contact Person: Mrs. Li

Tel: 86-13480804763

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