GJD392 - D-TECT X
- CCTV Lens Guide
- Hard Drive Size Guide
Unless selecting a vari-focal camera (with an adjustable lens) It is important to select the correct camera lens option for where the camera is to be positioned. A smaller lens will give you a wider angle but will be "zoomed out more", while a bigger lens will narrow the angle down and "zoom in more". See below to give you some idea on angles of Megapixel HD Cameras:
| Lens in mm | Approx Viewing Angle (degrees) | Ideal Distance (metres) | Typical usage/notes |
|---|---|---|---|
| 2.8 | 106 | <6 | For seeing as much of the immediate area as possible such as above a doorway/low down/garage soffits (edges can appear slightly warped/distorted) - clearly "zoomed out" |
| 3.6/4 | 83-90 | <12 | A great general purpose option giving great coverage still in the corner of a room or higher up on second floor soffits with less distortion - more of a natural "zoom" |
| 6 | 56 | 6-20 | Narrows down the angle and zooms in to look past the immediate area a little to gain more detail - down a driveway for example from higher up |
| 12 | 24 | 20+ | Zooms in significantly more to look at a gate, entrance or adjascent building |
| 16 | 19 | 24+ | As above but more so |
The amount of hard drive space you require is dictated by how many cameras, as well as their resolution and frame rate settings. Finally you can often make your storage space last a lot longer by enabling motion detected recording rather than continuous, especially if there are long periods of no activity.
|
Resolution (Megapixels) |
Days of storage provided by 1TB per camera (continuous - full 25 frames per second) |
Days of storage provided by 1TB per 4 cameras (continuous - full 25 frames per second) |
Days of storage provided by 1TB per 4 cameras (50% motion- 15 frames per second) |
|---|---|---|---|
| 1 | 44 | 11 | 36 |
| 2 | 22 | 5 | 18 |
| 3 | 17 | 4 | 14 |
| 4 | 11 | 3 | 9 |
| 5 | 9 | 2 | 8 |
| 6 | 8 | 2 | 6 |
| 8 (4K) | 5 | 1 | 4 |
| 12 | 4 | 0.5 | 3 |
As a rule of thumb we recommend a minimum of 2 Terabytes per 4 x 2-4MP HD cameras, as this should give you 2 weeks to a month with a few adjustments on motion detected recording. You may only require the full 25 frames per second on certain cameras if things are fast moving.
(All of our hard drives come fitted and are CCTV specific from one of the major brands)
GJD392 - D-TECT X
The GJD392 Receiver is an IP55 weatherproof, tamper protected, four channel unit equipped with two volt free & two negative switched outputs per channel. It can be expanded by the addition of up to 3 four channel expansion modules to allow the receiver unit to monitor the active state of up to 16 wireless D-TECT X movement detectors
- Communication Range: Up to 500 m (line of sight)
- Communication Codes 16,700,000, 868MHz
- Power Input 12 - 24V AC/DC
- Indicators (per detector) 1 x LED Detection 1 x LED Tamper 1 x LED RF loss 1 x LED Low battery indication
- Operating Temperature -20ºC to +55ºC Conformally coated electronics for increased stability
- Connections 1 x program socket for detectors. Expansion socket for connection to additional modules
- Outputs (per Detector) 2 volt-free, silent solid state magnetically immune contacts 2 neg. switched plus one common tamper (front and rear switches) 1 RF Loss 1 Low battery
- Capacity 4 detector module fitted as standard 3 slots for additional 4 channel expansion modules (total 16 detectors)
- Case High impact, flame retardant, UV stabilized Polycarbonate
- Protection Housing Minimum IP55
- Dimensions 210 x 180 x 75 mm (excluding aerial)
- Weight 658g NET, 720g GROSS
