vhfBridge for 3rd Party VHF Transmitters

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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 kilometres. vhfBridge can be used as a primary or a backup communication channel.

- Allows Ajax to work in areas with an unstable Internet connection
- Up to 8 potential outputs
- 15 different events supported by vhfBridge
- Supports a backup battery (see here)


Technical Specifications
Classification Transponder for communication with the monitoring station via a VHF transmitter
Installation method Indoors
Compatible with Ajax central units Operates with Hub Plus, Hub 2, Hub 2 Plus 
Compatible with Ajax range extenders Operates with Rex, ReX 2
Number of potential outputs 8
Output types Positive trip and negative trip (depends on the settings)
Transmission types Pulse and bistable (depends on the settings)
Recommended VHF transmitters Hawk VHF Alarm Transmitter from FSK Electronics
TX750C from RDC
TR-41 from Puper
Compatibility with third-party VHF radio transmitters vhfBridge connects to any VHF transmitter with relay inputs
Support for photo verification of alarms No
Primary power supply 100–240 V, 50/60 Hz
Backup power supply 12 V DC, up to 75 hours of power for a transponder and a transmitter
Supported battery type 12 V battery with a full charge cycle of up to 30 hours.
The maximum battery size installed in the casing should be 150 x 64 x 94 mm
Recommended battery type 12 V battery with a capacity of 4 Ah or 7 Ah (not included)
VHF transmitter power 12 V DC, 2 A
Anti-sabotage Protecting against forgery
Jamming notifications
Tampers against opening and removal
Backup battery
Jeweller radio protocol Communication range — up to 1,800 meters in a line of sight
Two-sided communication between devices
Operating frequencies: 868.0–868.6 MHz
Auto-regulated radio signal power: ≤ 25 mW
Blocking encryption based on the AES algorithm
Detector ping interval: 12–300 seconds
Frequency hopping
Maximum radio signal power ≤ 25 mW
Protection class IP50
Operating temperature range -10°С to +40°С
Operating humidity Up to 75%
Dimensions 196mm х 238mm x 100mm
Weight 840g
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