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Locator Beacons
Emergency Receivers
RT-B77 Personal Locator Beacon

The RT-B77 HELB is currently the most advanced and most powerful personal locator beacon (PLB) available on the market for man overboard (MOB) emergencies. The RT-B77 is designed for automatic activation upon contact with water or inflation of the wearer’s life jacket and can also be activated manually.


This PLB also features a second frequency that can be used for testing or training purposes. Transmission of a dedicated ID and simple control of system and maintenance data by means of an IrDA interface are important benefits for operators of larger fleets. Autotest functions and status reports are announced by the system's speaker to guarantee high availability.


Special Features

Very high output power

Designed for use under adverse conditions

Extremely compact, lightweight design

High efficiency RF amplifier technology

Water resistant up to 50 m for diving applications

Automatic activation upon contact with water (can be disabled)

Programmable beacon ID for transmission

Functional and operating status by LED and built-in speaker

Voice output at RF and speaker

PLL design for free selection of training frequency

Microprocessor controlled power management for long battery life


Dimensions width x height x depth: 75 mm x 103 mm x 27 mm
Weight 230g
Operating temperature -20 °C ... +60 °C
Ingress protection Water resistant up to 5 bar / 50m
Operating frequency 121.500 MHz (VHF), 243.000 MHz (UHF) optionally available
Training frequency Preselectable (in 25 kHz increments between 120.000 and 125.000 MHz)
Output power 2 W*
Modulation A3X and ASK
FSK (on request)
Battery type 2 x 9 V block LiMnO2
Battery life 6h to 48h*
Interfaces IrDA and RS232

* As a function of microprocessor controlled power management