Long-Range Wireless Dry-Contact Transceiver

💡 Key Summary: Long-range wireless transceiver that sends alarm dry-contact signals up to 1 km without wiring

YH-RF300 TX/RX is a long-range wireless transceiver that delivers dry-contact (alarm) signals from leak detectors, fire detection devices, and equipment fault alarms to remote locations via wireless. Supporting communication up to 1 km (open area, Line of Sight) and 8 inputs / 8 outputs, it enables fast and stable alarm system deployment even in large facilities where cabling is difficult.

Up to 1 km wireless alarm transmission without wiring | supports 8 inputs / 8 outputs


YH-RF300 TX (Transmitter)	YH-RF300 RX (Receiver)

Features

● Wireless transmission replacing wiring: Sends alarm dry-contact signals (leak, fire, equipment fault, etc.) wirelessly to remote locations.

● 8 inputs / 8 outputs: Supports 8 inputs (COM, NO) and 8 outputs (COM, NO, NC) for easy integration with various sensors and alarm devices.

● Near real-time operation with minimal delay: TX input activation and RX output operation occur almost simultaneously, ideal for real-time alarm notification.

● Long-range communication (up to 1 km): Stable wireless transmission up to 1 km in open areas, suitable for large sites.

Specification

Item	Specification
Model	YH-RF300TX (Transmitter) / YH-RF300RX (Receiver)
Operating Power	DC 8 ~ 38V (Wide input voltage)
Power Consumption	1W (Max) - Low-power design
Frequency	• 447.8625 ~ 447.9875Mhz BAND (Data transmission / 11 channels) • 447.2625 ~ 447.5625Mhz BAND (Safety system / 25 channels)
Receiver Sensitivity	-117 dBm (TX power: +10 dBm)
Transmission Distance	Over 1000m (Line of Sight, 4,800bps, 10dBm, 100% receive success)
Antenna	SMA TYPE ANTENNA (External antenna)
Input	8 points (COM, NO) Dry-contact input
Output	8 points (COM, NO, NC) Dry-contact output
Contact Rating	AC 250V 5A / DC 30V 5A
Channel Setting	32 frequency channels selectable (DIP S/W)
PCB Size	TX: 90(W) x 79(H)mm / RX: 63(W) x 79(H)mm
Enclosure Dimensions	200mm X 150mm X 75mm (Excluding antenna)
Operating Temperature / Humidity	-20 – 60°C / 0 – 80% RH

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Dimensions

| Wireless Transmitter: YH-RF300 TX

YH-RF300 TX Dimensions

| Wireless Receiver: YH-RF300 RX

YH-RF300 RX Dimensions

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