USER MANUAL DNG-2300
INTRODUCTION ACOUSTIC EAVESDROPPING Thank you very much for purchasing the DNG-2300 digital noise generator. The DNG-2300 is designed to prevent listening though devices that cannot be detected by conventional countermeasures and installed around the perimeter of a room – wired wall microphones, contact microphones, AC outlet transmitters and window systems based on the reflection of laser/infrared/microwave beams. It is an excellent addition to high level countermeasures.
LOOPBACK INPUT The DNG-2300 has an input LOOPBACK which allows easy and fast tuning to the necessary level of noise. Optional probe microphone DNG-MIC and probe stethoscope DNG-STET are used for the required measurements. SUPPLIED SET The DNG-2300 is supplied with AC power cable and user manual. The TRN-2000 and the OMS2000 are sold separately. Their quantity depends on the room size and the situation. The probe microphone DNG-MIC and the probe stethoscope DNG-STET are also sold separately.
6. Level adjustment - Channel 2 7. Indicator switch on/off Channel 3 8. LOOPBACK input 9. Level adjustment - Channel 3 REAR PANEL Figure 2 1. 2. 3. 4.
but not necessarily against acoustic leakage. During Construction or remodeling of a screen room, the transducers can be mounted on the frame members, and then acoustic insulation and a decorative panel can be installed to the inside wall surface. This will help isolate the noise generated from the room as well as decrease the acoustic leakage out of the room.
Figure 4 Plastic Disk Mounting The transducer may be attached to plate glass windows or other smooth surfaces using the plasticmounting disk. The glass must be firmly mounted to avoid vibration. la. For temporary mounting, use double-stick tape and press the disk firmly to the clean and dry surface. (Figure 5) Figure 5 1b. For permanent mounting, discard the double-stick tape and use a small amount of clear silicone exterior caulking compound.
SPEAKER INSTALLATION INTRODUCTION Omni Masking Speakers should be placed above the ceiling tiles, in storage rooms that are inside the target area and do not have transducers installed on the adjacent walls, or within crawl spaces that do not have protection. QUANTITY REQUIRED Determine the number of speakers needed by these recommendations: Drop/Tiled Ceiling - One centered on every 81 square feet. Closets/Crawl Spaces - One suspended half the height of the room; centered on every 81 square feet.
CONNECTIONS Transducers Figure 8 shows the three level combinations for transducers. "Full Level" transducers are recommended for solid or cement walls, floors, and ceilings. "1/2 Levels" are used for typical drywall or less dense surfaces. "1/2 Levels" and "1/3 Levels" are suggested for glass panes dependent on size. Combining levels can be done, but care should be taken to verify the correct output volume out of each transducer.
Figure 10 WIRING Attn: Do not turn on the DNG-2300 until you have completed wiring the transducers as recommended in this manual. Route the wiring so that it cannot be pinched, cut, tripped over, or damaged in any way. Connect the wires to the transducer using the female "quick connect" tabs furnished. Crimp or solder the wire to the tab. For lengths of less than 60 feet, use 18-gauge "zip cord" wire.
position. 4. Increase the output level until the LOOPBACK indicator shows the middle reading – the red light should be on the 10th segment of the bargraph. 5. Place the DNG-MIC where a potential listening device could be hidden or a person carrying a recorder or a microphone could stand/sit. Check that the LOOPBACK reading is not less than 10. Increase the level if necessary. Probe all places where a person could stand or sit.
PRECAUTIONS • Do not connect more than two transducers in parallel or loads that present impedance less than 3 ohms to the output. • Avoid areas with high moisture. • Do not drop. • Provide adequate ventilation around the cabinet. • Avoid extreme temperature exposure (below -22F (-30C) or above 122F (50C)) • There are no serviceable parts inside. Contact your dealer or manufacturer for repairs. Opening the unit will void the warranty.
