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

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Document ID	278610
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Document Description	users manual
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Document Type	User Manual
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Filesize	23.19kB (289883 bits)
Date Submitted	2002-10-23 00:00:00
Date Available	2002-10-23 00:00:00
Creation Date	2002-10-16 09:43:42
Producing Software	Acrobat Distiller 5.0 (Windows)
Document Lastmod	2002-10-16 09:43:42
Document Title	Microsoft Word - Helmet Audio Intercept System Ops Manual.doc
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Document Author:	csr

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.
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
Figure 4
Figure 6
Figure 5
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
NOTE: 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 11
Figure 10
Figure 12
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.
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.
Specifications Transmitter Unit
Size
transmit module
pick up module
oval
interconnect cord
weight
with batteries
power
2 each alkaline AAA size
battery life
w/ alkaline batteries
frequency
modulation
audio band pass
transmit power
harmonic emissions
frequency deviation
operating temperature
90mm x 30 mm x 40mm
80mm x 50mm x 7mm
350mm
100 gms
3 Vdc @ 7.5 ma
approx 24 hours
916.468 MHz
analog FM audio
300 Hz to 3 KHz
approx 1 mw
-50 dbc
approx 100 KHz max
0 to 70 degrees C.
Specifications Receiver Unit
Size
receiver unit
weight
power
derived from VCB
LO frequency
LO feed through
receiver sensitivity
audio band pass
audio out power into 8 ohms
frequency deviation
operating temperature
85mm x 30 mm x 55mm
60 gms
12 Vdc @ 15 ma
905.78 MHz
-50 dbc
approx -100 dbm
300 Hz to 3 KHz
approx 400 mw
approx 100 KHz max
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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Metadata Date                   : 2002:10:16 16:43:42Z
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Title                           : Microsoft Word - Helmet Audio Intercept System Ops Manual.doc

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