E OIR Technologies APU001 Wireless Headset Audio Transmitter Device User Manual users manual

E-OIR Technologies, Inc. Wireless Headset Audio Transmitter Device users manual

users manual

1 Helmet Audio Intercept System Important FCC information Compliance Statement required by FCC 47 CFR 15.19: This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Requirement of FCC 47 CFR 15.21: The user is cautioned that changes or modifications not expressly approved by E-OIR, the party responsible for compliance with FCC regulations, could void the user's authority to operate the equipment." Introduction Figure 1 Helmet Audio Intercept System The Helmet Audio Intercept System is designed to non-intrusively pick up the tactical vehicle intercom and radio conversations.
2 The Intercept system consists of two subsystems, a transmit unit worn on the commanders helmet, and the receive unit that is an integral part of the Range Evaluation System Video Control Box. The transmit unit requires no hard wire connection to the vehicle audio system. The transmit unit has two main parts (see fig 2), the audio pick up coil, and the R. F. transmit module. The pick up transmit unit attaches to the back of the commander's helmet. A pick-coil is inserted in one of the helmet earpieces. Intercepted audio from the earpiece is then sent via wireless link, to the receiver unit located in the Video Control Box (VCB). The receiver recovers the transmitted audio and redistributes this audio to the video transmitter Figure 2 located near the base of the video transmitter antenna. The primary features of this system are: 1. The pick up unit is wireless, thus the commander is free to move normally. 2. The pick up is completely immune to external audio (noise). 3. The transmitter operates at very low output power. This allows several vehicles using the same frequency to operate near one another without interfering with each other. Installation 1. Battery Installation/Replacement. Install/replace the “AAA” batteries by first removing the transmitter assembly from the camo pouch (see Figure 3). Insure that the power switch is placed in the off position (see Figure 4). Remove the plastic housing cover to expose the battery holder (see Figure 5). Carefully remove the old batteries if necessary. (see Figure 6) If old batteries were present, carefully inspect the battery holder for any possible leakage damage. Figure 3
3 Figure 4 Figure 5 Figure 6 Figure 7 If present and not excessive, leakage can be removed with a soft cloth or cotton swab and a mild detergent solution. Completely dry the holder before installing new batteries. Install new batteries as illustrated in Figure 7. Carefully observe polarity markings on both the holder and the batteries. Insure that the negative side of the battery goes against the spring terminal of the holder. Replace the housing cover and insert the housing back into the camo pouch. (see Figure 8) Figure 8
4NOTE: Experience has indicated that some batteries fit very snugly in the holder. With these batteries the holder spring may not provide enough pressure to push the positive side of the batteries into good electrical contact with the positive terminals of the holder. The installer should insure that the positive battery terminal makes good contact with the holder terminals. NOTE: It is not uncommon for "dry cells" to leak battery chemicals as they grow old, even though they may not have been used. These chemicals are mildly corrosive. To prevent damage from batteries being left in transmit module during storage, the batteries should always be removed prior to storage. 2. Pick Up Module Installation. The pick up module is installed by carefully pushing the soft rubber edge of the module under the helmet headset ear cushion. The module has an untreated rubber side with the E-OIR logo,(see Figure 9) and a fabric covered side,(see Figure 10). The rubber side is designed to go against the headset speaker while the fabric covered side is designed to go against the users ear. Figure 11 illustrates the process of pushing the module edge under the earpiece cushion recess. Figure 12 illustrates the completed installation of the module. Figure 9 Figure 10 Figure 11 Figure 12
5 Figures 13 and 14 illustrates the proper installation in an actual helmet. Figure 13 Figure 14 3. Transmit Module Installation. The transmit module is installed by inserting the rear helmet strap through the camo pouch loop. Figure 15 illustrates the location of the loop and Figure 16 illustrates the correct installation on the rear of the helmet. After installation the unit is placed into operation by pushing the power slide switch to the on position. (away from the pick up cable) This can be done easily with the housing installed in the camo pouch. Figure 15 Figure 16 4. Operational Test The System may be tested for proper installation by talking into the vehicle intercom system and insuring that the audio can be heard at either the tower observation site receiver or on the vehicle system test set.
6 Receiver Unit 1. Installation The Receiver Unit does not have any operator/user controls. It is fully integrated into the Range Evaluation Vehicle Subsystem. Once the VCB is installed and placed into operation, no further action is required.
7Specifications Transmitter Unit Size transmit module 90mm x 30 mm x 40mm pick up module oval 80mm x 50mm x 7mm interconnect cord 350mm weight with batteries 100 gms power 2 each alkaline AAA size 3 Vdc @ 7.5 ma battery life w/ alkaline batteries approx 24 hours frequency 916.468 MHz modulation analog FM audio audio band pass 300 Hz to 3 KHz transmit power approx 1 mw harmonic emissions -50 dbc frequency deviation approx 100 KHz max operating temperature 0 to 70 degrees C. Specifications Receiver Unit Size receiver unit 85mm x 30 mm x 55mm weight 60 gms power derived from VCB 12 Vdc @ 15 ma LO frequency 905.78 MHz LO feed through -50 dbc receiver sensitivity approx -100 dbm audio band pass 300 Hz to 3 KHz audio out power into 8 ohms approx 400 mw frequency deviation approx 100 KHz max operating temperature 0 to 70 degrees C. Manufacturer information For additional information contact: E-OIR Measurements Inc. Suite 200 Fredericksburg, Va. 22401 Phone: 540 752 6650 ex 204 Fax: 540 752 2824

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