Introduction: What the GJD397 D‑TECT X Repeater Does
The GJD397 D‑TECT X Repeater is a purpose‑built wireless range extender for the GJD D‑TECT X family of motion detectors. Designed to operate at 868 MHz, this compact, weatherproof device receives and automatically repeats detector signals to extend reliable wireless coverage up to 500 m line‑of‑sight. Supplied with a 12 VDC power supply module, the D‑TECT X Repeater is a plug‑and‑play solution for sites where detector signals must be relayed across long distances, around obstacles, or between separate buildings.
Key Features at a Glance
- Extended range:Boosts RF transmission up to 500 m LOS, helping detectors reach a central receiver or panel where direct links are impractical.
- Plug‑and‑play:Automatically repeats detector transmissions — no programming or pairing required, which speeds installation and commissioning.
- Weatherproof enclosure:UV‑stabilised polycarbonate housing suitable for internal or external mounting, with front and rear tamper switches for enhanced physical security.
- Low power operation:Operates on 868 MHz with transmit power under 25 mW and a typical current draw of around 23 mA at 12 V.
- Supplied PSU:Includes a 230 VAC → 12 VDC, 1 A power supply module; installer must fit the PSU in accordance with local wiring regulations.
Detailed Specifications and Benefits
Understanding the technical details helps installers and specifiers evaluate when the GJD397 is the right choice. Below are the core technical and physical specifications, followed by the practical benefits each delivers.
- Model:GJD397 D‑TECT X Repeater
- Range:500 m (line of sight)
- Wireless frequency:868 MHz
- Transmit power:<25 mW
- Current:≈23 mA @ 12 V
- Tamper:Front & rear tamper switches (case open & wall removal)
- Operating temperature:−10 °C to +50 °C
- Protection rating:IP55 / IP65 referenced (see product notes)
- Dimensions:W210 × H180 × D79 mm
- Weight:≈750 g net (880 g gross)
- Housing:UV‑stabilised polycarbonate, flame‑retardant, conformal coated electronics
- Power / PSU:230 VAC → 12 VDC, 1 A PSU module included
- PSU outputs:12 VDC 1 A; 5 VDC 0.1 A (on module)
- Mounting:Wall/surface mount – suitable for internal or external mounting
- Increased coverage:By providing up to 500 m LOS extension, the repeater allows detectors sited at the edge of coverage or behind obstructions to communicate reliably with control equipment.
- Simplified installation:Plug‑and‑play operation removes the need for time‑consuming programming or registration steps, reducing labour time and the risk of configuration errors.
- Robust for outdoor use:UV‑stabilised, flame‑retardant housing and tamper switches help maintain durability and security in exposed installations.
- Energy efficient:Low current draw helps where power budgets are limited and reduces the thermal load in enclosed spaces.
- Compliance awareness:The product documentation references both IP55 and IP65 in different places; installers should consult the manufacturer datasheet or GJD support for a definitive IP rating when labelling or specifying for compliance purposes.
Use Cases and Ideal Scenarios
The GJD397 excels where conventional direct wireless links are unreliable or impossible. Typical scenarios include:
- Large estate perimeter protection:On sprawling sites such as warehouses, industrial parks, or campuses, repeaters bridge gaps between detectors and a central alarm receiver so the entire perimeter can be monitored without running long cables.
- Separate buildings:When detectors are located in outbuildings, garages, or across roads, a repeater mounted midway can relay signals safely and securely to the main building's receiver.
- Challenging RF environments:In areas with dense structures, steelwork, or high RF noise, placing a repeater at a strategic point can overcome dead zones and ensure consistent alarm reporting.
- Rapid deployment projects:Temporary sites such as events, construction compounds, or pop‑up facilities benefit from plug‑and‑play repeaters to provide immediate, reliable wireless coverage without complex setup.
- Retrofit installations:For existing systems where running new cabling is costly or disruptive, the D‑TECT X Repeater provides a cost‑effective way to extend range and preserve detector locations.
How It Compares with Similar Products
When evaluating wireless repeaters, consider range, frequency compatibility, ease of installation, environmental protection, and maintenance needs. The GJD397 competes strongly in several areas:
- Range:With up to 500 m LOS, the D‑TECT X Repeater is competitive with mid‑to‑long range repeaters in the security market. Some repeaters from other manufacturers may advertise greater range, but real‑world performance will depend on frequency band, antenna design, and site conditions.
- Frequency:Operating at 868 MHz is standard for many European wireless security devices; this ensures compatibility with the GJD D‑TECT X ecosystem and reduces interference compared with busier sub‑GHz bands in some regions.
- Usability:The plug‑and‑play approach removes configuration complexity. By contrast, some repeaters require manual pairing or network registration, which can add installation time and potential points of failure.
- Durability:The UV‑stable, flame‑retardant polycarbonate housing and tamper switches make it well‑suited to outdoor and semi‑exposed environments. Competing units with metal housings or lesser ingress protection may fare differently depending on mounting and exposure.
- Power solution:Inclusion of the 230 VAC → 12 VDC module is convenient. Some alternatives rely on separate power accessories or battery operation, which may be a pro or con depending on the installation scenario.
Customer Feedback and Reviews
There are no formal customer testimonials supplied with the product brief. Typical feedback from installers and specifiers of similar GJD products can be summarized as an emphasis on reliability, ease of installation, and robust build quality. If you need verified customer reviews, consider requesting references from GJD, checking reseller websites, or consulting industry forums and installation case studies.
- "Quick to install and commissioning time was minimal due to plug‑and‑play behaviour."
- "Used on a campus project to bridge signals between buildings — performed consistently once placed in a line‑of‑sight position."
- "Tamper switches and sturdy enclosure gave confidence for external mounting near perimeter gates."
Note: The example observations above are generalized installer sentiments based on typical use of GJD repeaters and should not be taken as direct endorsements of this specific unit. For authoritative testimonials, request customer case studies from GJD or approved resellers.
Pricing, Compliance and Final Considerations
The supplied numeric cost price is 223.13 with a suggested retail price of 265.63 to secure a minimum 16% gross margin. Please confirm the currency (for example GBP) and whether VAT‑inclusive pricing is required so a final RRP and UK reseller comparisons can be prepared.
Compliance notes: the documentation references both IP55 and IP65 in different places. For labelling, tendering, or safety compliance use the official GJD datasheet or contact GJD support for the single authoritative IP rating. Installation must comply with local wiring regulations; the PSU should be installed by a qualified engineer and, where required, behind an RCD.
Conclusion: Why Choose the GJD397 D‑TECT X Repeater?
The GJD397 D‑TECT X Repeater is a practical and reliable answer to a common problem in wireless security systems: how to maintain dependable communication across distance and challenging site conditions. Its strengths are straightforward — up to 500 m LOS range, plug‑and‑play operation that reduces installation time, weatherproof and tamper‑aware construction for outdoor use, and a supplied 12 V power module for convenience.
For installers, security managers, and specifiers looking to extend the effective reach of GJD D‑TECT X detectors without complex programming or extensive cabling, the GJD397 represents a balanced option that blends performance and simplicity. Confirm the IP rating and pricing currency for procurement, and where possible consult manufacturer documentation and field references to validate performance in environments similar to your site.
If you would like, I can prepare a formatted specification sheet, a VAT‑inclusive RRP based on your preferred currency, or a comparison table against specific competitor models — tell me the currency and any competitor models you want compared.
