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  • 8 – Analog High Definition or NTSC Analog channels & 4 IP channel
  • H.264 video compression
  • Dual Streaming
  • Analog High Definition Channels support up to 1080p resolution
  • Up to 2TB of Storage
  • Fanless Design & integrated lock box
  • Wireless Ready – WiFi & Cellular
  • Standard compliance with IEC60950, CE-ROSH, EN50155 (EMC), ISO7637-2, EMARK(E13), and FCC

The Gatekeeper 508HD4a is an 8 channel (8 AHD / NTSC analog, 4 IP) video/audio recorder. The eight analog channels can be configured as either AHD or NTSC channels. When configured for eight NTSC analog channels, each channel will record a maximum of 30 FPS simultaneously with independently selectable resolutions and 8 quality levels. When eight channels are configured for AHD, the DVR will support 22 FPS each at 720p or 10 FPS each at 1080p. Analog High Definition camera utilizes Gatekeepers standard analog cables. This allows vehicles with existing analog compatible cabling to be easily updated to high definition cameras.

The 508HD4a DVR supports the AHD-M video standard. When combined with Gatekeeper’s S32AHD camera, video resolution is increased from standard D1 (720×480) to 1080p (1920×1080) high definition resolution. The 508HD4a DVR also supports the 960H (928×480) video standard.

The 508HD4a DVR also supports 2TB of storage in spinning hard drives or SSD drive formats.


The 508HD4a incorporates many features that dramatically increase the reliability of the DVR and the availability of recorded video. A custom file system is used to record data to the hard drive. This file system has been designed so that video can be recovered under most scenarios.

The 508HD4a has a high capacity power supply. The power supply stores energy so that if the DVR loses power (when the engine is started or other high current draw electrical devices are turned on, such as air conditioners or hydraulic lifts), there is enough energy in the power supply to continue to power the internal circuits of the DVR for a short period of time. For example, when power to the DVR is lost the DVR closes the video files correctly and then power down into a safe low power state. This makes the DVR virtually immune to the notorious unreliable power found in vehicles.

The 508HD4a has a latched door that prevents users from inadvertently removing the Caddy (hard drive carrier) before powering down the DVR. The key must first be turned to the unlock position before the door can be unlatched and opened and the caddy can be removed. When the door is unlatched and opened, the DVR shuts down, and it is safe to remove the Caddy. After the Caddy is reinserted, and the door is closed and latched, the DVR reboots and is once again ready to record.


The 508HD4a DVR passes MIL SPEC 810F (Trucks on Streets) for shock and vibration. In addition, Gatekeeper has developed and subjected the Gatekeeper DVRs to custom shock and vibration profiles. These profiles were derived by placing sensors on vehicles, and recording the shock and vibration that actual DVRs were subjected to in real world conditions.


The 508HD4a allows users to download video and/or video of marked events to a USB memory stick that can be inserted in the front of the DVR.


The 508HD4a is WiFi Ready. Gatekeeper’s WiFi system will provide radio coverage in a typical vehicle yard. Utilizing WiFi 802.11n at 5GHz Gatekeeper offers both a rugged industrial rated access point and a WiFi radio for the vehicle. Through the use of Auto Wake, a user can turn on the DVR and WiFi radio in the vehicle so that video can be accessed.


The 508HD4a is dual streaming. This means a high quality full resolution image can be stored on the SD card while a lower resolution image can be streamed over the optional cellular connection.


The following optional peripherals are available:

• Driver Alert Button with Status LEDs
• Rear cable cover
• Interactive Control Display
• External G Sensor
• 4 Port Hub

System Specifications

     Video Channels (Analog)


Video Channels IP

 8 channels (AHD or NTSC Analog)


4 IP channel

     Output  1 channel
     Video Compression  H.264
     Video Quality  User configurable  (1 to 8)

 IP: Camera Dependent – 720 or 1080p


 AHD: 1080p (1920×1080), 720p (1280X720), WD1 (928X480), WHD1 (928X240), WCIF (464X240), D1 (704×480), HD1 (704×240), CIF (352×240)

 NTSC: WD1 (928X480), WHD1 (928X240), WCIF (464X240), D1 (704×480), HD1 (704×240), CIF (352×240)

 PAL: WD1 (928×576), WHD1 (928×288), WCIF (464×288)

     Video Resource

Analog/AHD Cameras:


8 Channels 720p @ 22FPS

8 Channels 1080p @ 10FPS

8 Channels D1 @ 30FPS

IP Cameras:

4 Channel 720p @ 30FPS

4 Channel 1080p @ 30FPS

     On Screen Display  User configurable
     Video Streams  Dual Streaming
     Audio Channels  8 channels analog and 4 via IP
 Output  1 channel
     Audio Compression  ADPCM
     Dual SD Storage

 Removable Hard Drive – Up to 2TB Hard Drive or SSD


SD Card: 32GB, 64GB, 128GB & 256GB

     Recording trigger  Recording Trigger Schedule, alarms, sensor triggers (includes ignition)
     Pre recording  0 to 60 min
     Post recording  Max 30 min
     File Size  15 min of video
     DVR Video Playback  Up to 12 channels using G4 Viewer Plus
     Search Method  Date/Time, channel file type
     Backup Mode  USB
     Ethernet  Ethernet RJ 45 port (10/100M)
     Cellular  Optional external 3G or 4G cellular module
     WIFI  Optional 802.11n 5GHz
     GPS  GPS Location, Speed, Time Sync
     Input  Input 8 to 36v
     Output 5V@500mA, 12V@500mA
     Consumption  48w recording
     Standby Current  <1 mA @ 12.6V

 8.3” x 6” x 3.5” (210 mm x 150 mm x 89 mm) without cable cover


11” x 6” x 3.5” (280 mm x 150 mm x 89 mm) with cable cover (optional)

     Weight  4.4 lbs. (2.0 kg)
     Operating Temperature  -40°F – 158°F (-40°C to +70°C)
     Humidity  Below 90% non-condensing

508HD4a Product Sheet