–

–

–

–

2

3

Ordering Information

Theory of Operation

The OTX-868-HH-LR8-PRC Long-Range Handheld Transmitter uses

high performance FSK radio that utilizes a proprietary Adaptive Frequency

Agility (AFA) technique and over-the-air protocol. The AFA offers much

greater noise immunity and range than traditional narrow-band transmitters.

When a button is pressed on the transmitter, power is applied to the

internal circuitry and the module is enabled. The module detects the logic

states of the button data lines. These states are formatted into a packet

and transmitted repeatedly until the button is released.

The receiving module checks the addressing in the received packet (and

encryption, if enabled). If the packet is valid and intended for the receiver,

then the module replicates the transmitter's button states on its outputs.

These outputs can then be used to activate whatever external circuitry is

required by the application.

product families. Ranges of up to 0.8 mile (1,300m) are possible with good

antennas and a quiet, line-of-sight environment. Applications operating

over shorter distances also benefit from the increased link reliability and

superior noise immunity provided by the radio and protocol.

mixed-mode systems that combine data transmissions with remote control

accept remote control commands from the handheld transmitter as well as

sensor values from other devices in system. This greatly reduces system

cost and complexity and opens up many options for the creative designer.

Contention Considerations

While it is still possible for interference to interrupt the transmissions, the

Access requirements in the RED standard. Part of this is a Clear Channel

Assessment (CCA). The module briefly listens in on a channel before

it begins a transmission to ensure that there are no other transmitters

currently using the same frequency. If the module detects other RF signals

on the same frequency it will either wait for short random amounts of time

for the other transmission to end or jump to the next channel to make its

transmission.

Electrical Specifications

Parameter

Designation Min.

Typ.

Max.

Units

Notes

Power Supply

Operating Voltage

V

CC

2.1

3.0

3.6

VDC

Supply Current

l

CC

39

mA

1

Power-Down Current

l

PDN

1.0

µA

Transmitter Section

Transmit Frequency Range

F

C

863

870

MHz

Environmental

Operating Temperature Range

–40

+85

°C

2,3

Electrical Specifications

Ordering Information

Part Number

Description

HUM-868-PRC

tellation Interface, External Antenna Connection

HUM-868-PRC-CAS

fied, Castellation Interface, External Antenna Connection

HUM-868-PRC-UFL

fied, Castellation Interface, u.FL Connector

HUM-868-PRO

Interface, External Antenna Connection

HUM-868-PRO-CAS

tellation Interface, External Antenna Connection

HUM-868-PRO-UFL

tellation Interface, u.FL Connector

MDEV-868-PRC

Figure 3: Ordering Information

1.

For a 1-second button press

2.

Characterized, but not tested

3.

The coin cell battery may limit the operating temperature range; check the

manufacturer's reccomendations

Figure 4: Electrical Specifications