vhfBridge
Instant alarm transmission without Internet
vhfBridge is a transponder that provides a hub with an additional channel to communicate with a monitoring station. With vhfBridge you can use Ajax systems in cities where Internet connection is unstable, in nature reserves, mountain and desert areas.
Alarms and events of the system are transmitted via VHF radio waves over tens of kilometres1. vhfBridge can be used as a primary or a backup communication channel.Reliability and versatility by design
Elaborate autonomy
You can build in a 7 Ah backup battery inside a vhfBridge casing. It will feed a VHF transmitter with up to 2A current consumption. Therefore, the transmitter doesn't need to have a separate battery, which makes maintenance less frequent.
In case of a power outage at a facility, the transponder and the transmitter operate on a backup battery for up to 75 hours4 while still transmitting events to a central monitoring station.-
Up to 75 hours4 of autonomous operation
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Place for a 7 Ah backup battery
Adjustable signalling
Uncompromised security of communication
to 1,800 meters
0.15 seconds
from 12 seconds
Hassle-free installation
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Adding to the system by scanning a QR-code
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Mounting on a wall
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Connecting of a VHF transmitter
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Setting up with an app
Tech specs
TX750C from RDC
TR-41 from Puper
The maximum battery size installed in the casing should be 150 × 64 × 94 mm
Backup battery is not included in the set
Jamming notifications
Tampers against opening and removal
Backup battery
Two-sided communication between devices
Radio frequency bands:
866.0 – 866.5 MHz
868.0 – 868.6 MHz
868.7 – 869.2 MHz
905.0 – 926.5 MHz
915.85 – 926.5 MHz
921.0 – 922.0 MHz
(depends on the region of sale)
Auto-regulated radio signal power: ≤ 20 mW
Blocking encryption based on the AES algorithm
Detector ping interval: 12–300 seconds
Frequency hopping
Learn more about Jeweller
145 × 89 × 51 mm (without casing)
165 g (without casing)
Power cable
12 V battery connection cable
Installation kit
Casing (depends on a set)
Quick start guide