PRODUCT INFORMATION
vhfBridge
Module for connecting Ajax Security Systems to third-party VHF transmitters
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
- Place for a backup battery2 150 × 64 × 94 mm
- Perforated areas in the casing3 for accurate cable management
- 8 adjustable positive/negative trip outputs for sending events to a VHF transmitter
- VHF transmitter power supply 12 V DC, 2 A
- Casing protected from sabotage tampers detecting opening and removal from the surface3
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
- Place for a 7 Ah backup battery
Adjustable signalling
Get only events you need. You can configure each vhfBridge output in the Ajax app: set an event or disable it.
Uncompromised security of communication
vhfBridge communicates with a hub via an encrypted Jeweller radio protocol. It guarantees continuous interaction of all security system devices. The radio protocol uses frames to synchronize device communication sessions, authentication to prevent forgery, and encryption to protect against data theft.
- Connection with a hub at a distance of up to 1,800 meters
- Alarm transmission within 0.15 seconds
- Hub ping interval from 12 seconds
Hassle-free installation
Similar to other Ajax devices, vhfBridge connects to a hub in the app by scanning a QR-code. The transponder casing has perforated areas for more organized wiring. Outputs are configurable with Ajax apps for smartphones and computers.
Tech specs
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Colour |
White and black |
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Classification |
Transponder for communication with the monitoring station via a VHF transmitter |
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Installation |
Indoors |
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Number of potential outputs |
8 |
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Output types |
Positive trip and negative trip (depends on the settings) |
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Transmission types |
Pulse and bistable (depends on the settings) |
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Compatible with Ajax central units |
Operates with Hub 2, Hub Plus, Hub 2 Plus |
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Compatible with Ajax range extenders |
+ |
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Compatibility with third-party VHF radio transmitters |
vhfBridge connects to any VHF transmitter with relay inputs
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Support for photo verification of alarms |
No |
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Primary power supply |
100–240 V, 50/60 Hz |
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Backup power supply |
12 V DC, up to 75 hours of power for a transponder and a transmitter |
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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 × 64 × 94 mm |
|
Recommended battery type |
12 V battery with a capacity of 4 Ah or 7 Ah
Backup battery is not included in the set |
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VHF transmitter power |
12 V DC, 2 A |
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Anti-sabotage |
Protecting against forgery Jamming notifications Tampers against opening and removal Backup battery |
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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 or 868.7 – 869.2 MHz (depending on the region of sale) Auto-regulated radio signal power: ≤ 25 mW Blocking encryption based on the AES algorithm Detector ping interval: 12–300 seconds Frequency hopping
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Maximum radio signal power |
≤ 25 mW |
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Protection class |
IP50 |
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Operating temperature range |
From −10°C to +40°C |
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Operating humidity |
Up to 75% |
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Overall dimensions |
196 × 238 × 100 mm (with casing) 145 × 89 × 51 mm (without casing) |
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Weight |
840 g (with casing) 165 g (without casing) |
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Warranty |
Warranty service for 24 months from the date of sale.
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Complete set |
vhfBridge Power cable 12 V battery connection cable Installation kit Casing (depends on a set) Quick start guide |
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Lifespan |
10 years |
1 The distance depends on the transmitter, the terrain, and the weather. The maximum range varies in each particular case.
2 A backup battery is not included in the set
3 vhfBridge can be sold without a casing
4 When using a 7 Ah battery