KH2 Series RF Transmitter/Encoder and Receiver/Decoder Modules

Transmitters and Receivers for Digital Data with Integrated Encoders and Decoders

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This product has reached EOL. Please contact Linx about the KH3 Series, which replaces the KH2 Series.

Trigger discrete actions with button presses or contact closures by using KH2 Series transmitter/encoder and receiver/decoder modules. They contain Holtek chips and LR Series RF modules. The KH2 Series provides a low level of security. It lets you send commands from multiple transmitters to distinct receivers in the same vicinity through physical addressing. Use KH2 Series modules together or with compatible Linx components for reliable one-way wireless communication at 315MHz, 418MHz or 433MHz. Compared to 2.4GHz modules, narrowband modules from Linx provide longer range and lower current consumption at a more cost-effective price.

Security

The decoder will only accept transmissions from compatible encoders with addresses that match its own. The KH2 Series allows manual addressing through 10 tri-state pins. Because the address is visible in hardware, the KH2 Series is not as secure as the MS Series and HS Series encoders and decoders, which use digital addressing. Additionally, because the KH2 Series does not use encryption or rolling code, it does not protect against intentional security threats. For protection against intentional threats, consider using the HS Series with separate RF modules.

Benefits

Reduce component count: combined transmitter/encoder and receiver/decoder form a complete module solution with only two parts
Mix and match products: use the receiver with compatible Linx keyfobs and handheld transmitters
Integrate with ease: simple hardware configuration lets you transfer raw data without protocol constraints or the need for user programming
Save power: low current consumption compared to competing modules extends battery life
Simplify design: modules and antennas are the only RF components you need; no tuning required
Streamline production: save time and money with modules that are already tested
Avoid accidental conflicts: 3¹⁰ addresses help prevent identification mistakes

Ordering

Part	Description	Documentation
TXE-315-KH2	315MHz KH2 Series Transmitter/Encoder Module (End of Life)	Datasheet
TXE-418-KH2	418MHz KH2 Series Transmitter/Encoder Module (End of Life)	Datasheet
TXE-433-KH2	433MHz KH2 Series Transmitter/Encoder Module (End of Life)	Datasheet
RXD-315-KH2	315MHz KH2 Series Receiver/Decoder Module (End of Life)	Datasheet
RXD-418-KH2	418MHz KH2 Series Receiver/Decoder Module (End of Life)	Datasheet
RXD-433-KH2	433MHz KH2 Series Receiver/Decoder Module (End of Life)	Datasheet
EVAL-315-KH2	315MHz KH2 Series Evaluation Kit (End of Life)	Datasheet
EVAL-418-KH2	418MHz KH2 Series Evaluation Kit (End of Life)	Datasheet
EVAL-433-KH2	433MHz KH2 Series Evaluation Kit (End of Life)	Datasheet

To order, please call +1 (800) 736-6677 or +1 (541) 471-6256 for callers outside the United States.

	TXE-315-KH2	RXD-315-KH2	TXE-418-KH2	RXD-418-KH2	TXE-433-KH2	RXD-433-KH2
Role	Transmitter/Encoder	Receiver/Decoder	Transmitter/Encoder	Receiver/Decoder	Transmitter/Encoder	Receiver/Decoder
Frequency	315MHz	315MHz	418MHz	418MHz	433MHz	433MHz
TX power	2dBm typical		2dBm typical		2dBm typical
RX sensitivity		-112dBm typical		-112dBm typical		-112dBm typical
Interface	Transparent serial		Transparent serial		Transparent serial
Data rate	100 – 10,000bps	100 – 10,000bps	100 – 10,000bps	100 – 10,000bps	100 – 10,000bps	100 – 10,000bps
Modulation	OOK	OOK	OOK	OOK	OOK	OOK
Addresses/keys	3^10	3^10	3^10	3^10	3^10	3^10
Operating voltage	2.7 – 5.2VDC	2.7 – 5.2VDC	2.7 – 5.2VDC	2.7 – 5.2VDC	2.7 – 5.2VDC	2.7 – 5.2VDC
Supply current	1.5mA typical	5.2mA typical	1.5mA typical	5.2mA typical	1.5mA typical	5.2mA typical
Power down current	1.0µA typical	1.0µA typical	1.0µA typical	1.0µA typical	1.0µA typical	1.0µA typical
Operating temperature	-30 – +70°C	-30 – +70°C	-30 – +70°C	-30 – +70°C	-30 – +70°C	-30 – +70°C
Package	Reflow-compatible SMD	Reflow-compatible SMD	Reflow-compatible SMD	Reflow-compatible SMD	Reflow-compatible SMD	Reflow-compatible SMD
Architecture	SAW	Synthesized	SAW	Synthesized	SAW	Synthesized