Bose Rf273139_01D TTH Operators Manual Military Rf273139 01D

User Manual: Bose Triport Tactical Headset Series 2 – Bose Product Support

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CLASS
RF
REVISIONS
REV
DESCRIPTION
01 ECN-36327:UPDATE FIGURES;
CHANGE NAME TO TTH, UPDATE
EARCUSHION SECTION
01A UPDATE TO INCLUDE TTH S2

CHECK
VAB

DWG NO.
273139
ENG
AM

DATE
11/04

07/10

01B UPDATED TTHS2 TT BATT. LIFE TO 240
HRS.
01C UPDATED TTHS2 VOLT. RANGE

09/10

07/11

01D VARIOUS UPDATES

10/11

APPLICABLE DOCUMENTS:

DOC
LVL

3
2
1

DRAFTER
A. MANGIAMELI
CHECKER
J. BROWN
ENGINEER
A. MANGIAMELI
RLS TO PROD

DATE
02/05/04

FRAMINGHAM, MA 01701-9168
DESCRIPTION

02/27/04

MANUAL, OPERATING &
MAINTENANCE (TTH & TTH Series 2)

02/05/04
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01D
SHT 1 OF 25

HEADSET FEATURES
The Bose® TriPort® Tactical Headsets (TTH & TTH Series 2) are active noise
reduction (ANR) communication headsets intended to be used by military
passengers of wheeled combat vehicles. The TTH headsets include an earcup
assembly (earcups and napeband) and a cable/microphone assembly. The
headsets adjust to fit various heads using adjustment overhead hook and loop straps
to ensure proper fit for noise attenuation. The cable/microphone can be installed on
either the left or right earcup.
In addition to passive attenuation each earcup contains an independent ANR
system. The ANR system reduces background noise within each earcup. The talkthru circuit (TTC) allows for local communication when the headset is either
connected or disconnected from the vehicle. The TTC is a user-selectable feature
and is powered via a single AA size battery in the control module and utilizes the
microphones on the front of each earcup. Each earcup has an independent TTC to
allow left/right localization.

Earcup Assembly
• Overhead Strap
• Napeband
• Earcups
Cable/Mic Assy
• Noise-cancelling
microphone

NOTE
The control module
design is a key
differentiator between
TTH and TTH Series 2

• Control Module

• Vehicle Interface
Connector

TTH Series 2

TTH

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TECHNICAL INFORMATION

Headset can be donned and
doffed without removing
helmet.
Cable/boom microphone
assembly is replaceable and
can be positioned on left or
right side.
Mono and stereo versions
available.
Weight (on head)
Spring force (on head)
Push-to-talk (PTT) on the
control module
Talk-through (TTC)

ANR Power / Current Draw

Operating noise environment
Earphone sensitivity
Input Impedance
Boom microphone

TTH Series 2

16 oz. maximum
1.8 lbf. maximum
3-position (latched / off /
momentary) toggle type
switch
User-selectable, Binaural,
up to 240 hours operational
time with one AA alkaline
battery
5.5 to 32 VDC / 16 to 220 mA
Fail-safe operation allows 2way communications with
loss of voltage input or talkthrough power.

Same
Same
3-position (latched / off /
momentary) rocker type switch

Up to 95dBA SPL
106 ± 3 dB SPL for a 0 ± 0.1
dBV input
500 ± 10 ohms
150 ± 22.5 ohm Impedance
-70 ± 4 dB sensitivity
-40oC to +65oC Operating
-57oC to +71oC Storage
Qualified for fields up to 50
V/m

Temperature Rating
EMI

Attachment Clip

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TTH

Cable mounted

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User-selectable, Binaural,
240 hours minimum
operational time with one AA
alkaline battery
13.5 to 32 VDC / 38 mA Peak
except during turn-on
Fail-safe operation allows 2way communications with loss
of voltage input or talk-through
power.
Same
Same
Same
150 ± 22.5 ohm Impedance
-70 ± 4 dB sensitivity
Dust proof
-40oC to +65oC Operating
-57oC to +71oC Storage
Qualified for fields up to 50
V/m with improved
performance for reduced audio
interference with the latest IED
jamming devices and other
electronics.
Mounted on the control
module and compatible with
MOLLE webbing. Clip is
removable and may be
attached to either side of the
control module and rotated
into three different positions.

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HEADSET CONNECTORS AND CONTROLS
The connectors and controls for the TTH and TTH Series 2 headsets are integrated
into the cable/microphone assembly normally attached to the left earcup of the
headset. The assembly may be mounted on the right earcup if desired.
The control module on the cable/microphone assembly has a three-position push-totalk (PTT) switch as well as a two-position talk-thru circuit (TTC) switch as shown in
Figure 2.0b and 2.0c. The PTT switch is mounted on the face of the control module
and is spring loaded to the center (disabled) position with a momentary PTT position
and latched live intercom position. The control module may also be connected to the
communications microphones typically installed on protective masks. When the
external microphone connector is connected, the control module automatically
disengages the headset boom microphone to receive signals from the external
microphone.

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Figure 2.0b TTH Control Module Features
COMPONENT
Microphone Boom and Cable Assembly
PTT Switch

Vehicle Interface Connector
TTC Switch
M42 Gas Mask Microphone Connection
Battery Compartment

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FUNCTION
Transmits user’s voice into intercom or radio
channel
Used when transmitting on and listening to intercom
channel or radio. The latched position allows the
user to communicate on the vehicle intercom.
The OFF (center position allows the user to listen
only.
The Momentary (down) position allows the user to
communicate on the vehicle intercom and the
selected radio. Please note that these function
could vary by intercom. Please consult the intercom
manual.
Provides quick-disconnect for operator.
Used to monitor ambient noise environment when
desired.
Allows M116/G microphone in the M42 gas mask to
be plugged into the headset.
Contains AA alkaline battery to power TTC.

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In addition to offering all of the same features as the TTH, the TTH Series
2 has been redesigned for better ergonomics with an integrated
attachment clip.

Figure 2.0c TTH Series 2 Control Module Features

COMPONENT
Microphone Boom and Cable Assembly
PTT Switch

Vehicle Interface Connector
TTC Switch
M42 Gas Mask Microphone Connection
Battery Compartment

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Vehicle Interface Connector
Desc.

Physical Appearance
TTH

TTH Series 2

Connection
Pin-out

Monaural

Prior to

Function

Shield

PTT

Ground
(power and audio)

Boom mic
Ground**

Left/Right earcup
audio

Boom mic
Signal**

Power

Function

Shield
Contact

Shield

Right earcup
audio

PTT

Ground
(power and audio)

Boom mic
ground**

Left earcup
audio

Boom mic
signal

Power

Binaural

**Mic ground must be connected to the power/phone ground (pin 3) in the
intercom for the microphone circuit to function.

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HEADSET TROUBLESHOOTING

START

PHYSICAL DAMAGE OR
DETERIORATION PRESENT?

YES

REFER TO HEADSET
INSPECTION TABLE

CAN AUDIO BE
HEARD THRU TTC?

REPLACE TTC
BATTERY
(pg 14)

IS FAULT STILL
PRESENT?

YES

YES
SUBSTITUTE CABLE /
MICROPHONE ASSEMBLY
WITH KNOWN WORKING
ONE
(pg 13)
CONNECT HEADSET
TO KNOWN WORKING
INTERCOM/RADIO

NO
IS FAULT STILL
PRESENT?

YES

IS FAULT STILL
PRESENT?

MICROPHONE
TRANSMISSIONS RECEIVED
BY OTHERS?

ENSURE MICROPHONE
CABLE IS FIRMLY
CONNECTED BY
CHECKING RIBBON
CONNECTORS
(pg 13)

YES

REPLACE EARCUP
ASSEMBLY
(pg 13)

REPLACE BOOM
MICROPHONE
ASSEMBLY
(pg 17)

IS FAULT STILL
PRESENT?

YES
NO

CAN AUDIO BE
RECEIVED THRU
EARCUPS?

REPLACE EARCUP
ASSEMBLY
(pg 13)

YES

END

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Headset Inspection Table
Component
Earcup Assembly
Napeband
Earcushions
Cloth Scrim in Earcup
Cables
Connectors
Battery Compartment
Boom Microphpone
TTC Microphones

Condition
Check for cracks and other visible damage to the
housing.
Check for visible damage.
Check for visible cuts. Check that uniform
pressure does not cause bottoming against
earcup.
Check for tears or excessively dirty.
Check for cuts, kinks, or frayed area on cable.
Check for dents or other physical damage;
Corrosion buildup.
Check for leakage, dents, corrosion buildup or
other physical damage.
Check for visible damage to microphone
assembly.
Check for visible damage or blockage of the metal
screens in front of the TTC microphones on the
front of each earcup.

Corrective Measures
Replace earcup assembly*
Replace earcup assembly*
Replace earcushions.*
Replace scrim*
Replace cable/mic assy*
Replace cable/mic assy*
Replace cable/mic assy*
Replace boom microphone *
Replace earcup assembly*

* Refer to applicable removal and replacement procedure.

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HEADSET COMPONENTS REMOVAL AND REPLACEMENT PROCEDURES

5.1

Moving Cable/Microphone Assembly to Opposite Earcup

a. Removal
1. Using cross-tipped screwdriver loosen three captive screws (3) securing
cable/microphone assembly (2) to earcup assembly (1) and the decorative cover
(5) to opposite earcup assembly (1).

2. Unplug connector connecting the cable/microphone assembly (2) to the jumper
cable coming off the earcup printed circuit board and remove the
cable/microphone assembly.
b. Replacement
1. Plug cable connector from the cable/microphone assembly (2) into the jumper
cable (4) coming off the earcup printed circuit board.
CAUTION
Ensure no wires are pinched during reassembly of the electronics cover
to the earcup assembly.
2. Using cross-tipped screwdriver, secure cable/microphone assembly (2) to the
earcup assembly (1).
3. Using cross-tipped screwdriver, secure decorative cover (5) to opposite earcup
assembly.

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5.2

Earcushion and Scrim Removal and Replacement

CAUTION
Do not attempt to remove
the earcushion by pulling on
the soft earcushion material.

Figure 4.2 Earcushion and Scrim Removal and Replacement
a. Removal
1. Remove earcushion (1) from earcup assembly (3) by inserting fingers inside
earcup between scrim (2) and earcushion and firmly pulling out. Remove any
excess tape residue from the earcup surface.
2. Remove scrim (2) after earcushion (1) is removed.
b. Replacement
1. Align scrim (2) and place over screen in earcup assembly (3).
2. Remove and discard release liners (4) from tape on earcushion assembly.
3. Align and set earcushion (1) on earcup assembly (3) and snap in place.

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5.3

Windscreen and O-ring Removal and Replacement

Figure 4.3 Windscreens and O-ring Removal and Replacement
a. Removal
1. Grasp O-ring (2) between thumb and forefinger and slide O-ring (2) and
windscreen (3) off microphone (1).
2. Separate O-ring (2) from windscreen (3).
CAUTION
When placing windscreen/O-ring on microphone, be careful not to tear windscreen.
b. Replacement
1. Compress closed end of windscreen (3) and place inside O-ring (2) until O-ring is
midway on windscreen.
2. Slide O-ring (2) with windscreen (3) onto microphone (1) and adjust O-ring until
windscreen is secured.

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5.4

Overhead Strap Assembly Removal and Replacement

NOTE
The overhead strap
assembly consist of two
hook and loop strap
sections, hooks and loops.
When placing a single
strap at a time make sure
the replacing strap is the
same as the one being
removed.

Figure 4.4 Overhead Strap Assembly Removal and Replacement
a. Removal
Using a hex (Allen type) wrench remove screw (3) securing overhead strap (2) to
earcup assembly (1).
b. Replacement
Place screw (3) through opening in end of overhead strap (2) and use a hex (Allen
type) wrench to secure to earcup assembly (1).

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5.5

Cable/Microphone Assembly Removal and Replacement

a. Removal
1. Using cross-tipped screwdriver loosen three captive screws (3) securing
cable/microphone assembly (2) to earcup assembly (1). Unplug connector
connecting the cable/microphone assembly (2) to the jumper cable coming off
the earcup printed circuit board and remove the cable/microphone assembly.

b. Replacement
1. Plug cable connector from the cable/microphone assembly (2) into the jumper
cable (4) coming off the earcup printed circuit board.

CAUTION
Ensure no wires are pinched
during reassembly of the
cable/microphone assembly to
the earcup assembly.

2. Using cross-tipped screwdriver, secure cable/microphone assembly (2) to the
earcup assembly (1).

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5.6

Alkaline Battery Removal and Replacement

a. TTH Battery Removal and Replacement
1. Using flat-tipped screwdriver, loosen the captive screw on the battery cover and
rotate to open the battery compartment.
2. Remove old battery and insert replacement battery positive end first into the
battery compartment.
3. Close battery cover and tighten screw using flat-tipped screwdriver.
Captive screw on
battery cover

Control Module

Observe Polarity

+
b. TTH Series 2 Battery Removal and Replacement
1. Using flat-tipped screwdriver, loosen the captive screw on the battery cover and
rotate to open the battery compartment. Battery door is connected to the control
module via a stainless steel tether.
2. Remove old battery and insert replacement battery positive end first into the
battery compartment.
3. Close battery cover by inserting the tab on the battery cover into the slot in the
control module and rotating the battery cover closed.
4. Tighten screw using flat-tipped screwdriver.

Observe Polarity

Control Module

Captive screw on
battery cover
+
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5.7

Attachment Clip Removed, Replacement or Adjustment (TTH Series 2 ONLY)

a. Removal
1. Using a flat-tipped screwdriver loosen the captive screw securing attachment clip
to the control module and remove clip from the control module.
Control Module

Attachment
Clip

Attachment clip
captive screw

b. Replacement and Adjustment
1. Attachment clip can be rotated into 3 different positions.

Position 1

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Position 3

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2. Position attachment clip on the control module in the desired orientation. Rotate
the attachment clip 90 degrees in either direction, lining up the square feature on
the control module with the square hold in the attachment clip.
Attachment clip
alignment feature

3. Using flat-tipped screwdriver, secure attachment clip to the control module.

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5.8

Boom Microphone Removal and Replacement

2. Unplug the 3-pin connector connecting the boom microphone to the cable
assembly.

3. Remove the e-ring securing the boom microphone in place and remove and
discard the boom microphone.
NOTE
Remove o-rings with
microphone assembly.
O-rings may remain in
barrel when
microphone assembly
is removed.

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b. Replacement
1. Insert microphone through barrel of the plastic housing. Push replacement
microphone with 2 new o-rings into the barrel of the plastic housing and secure in
place with e-ring.

2. Plug 3-pin connector from the microphone assembly into the mating 3-pin
connector on the cable assembly. Ensure connectors are securely seated.

3. Plug cable connector from the cable/microphone assembly (2) into the jumper
cable (4) coming off the earcup printed circuit board.

CAUTION
Ensure no wires are pinched
during reassembly of the
cable/microphone assembly to
the earcup assembly.

4. Using cross-tipped screwdriver, secure cable/microphone assembly (2) to the
earcup assembly (1).

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Appendix A
Additional Technical Information

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Voltage Range
The headset shall operate in one of three different modes as a function of the
applied voltage. The operating modes shall be identified as “Unpowered”, “Low
Power” and “Intercom”, and each mode shall be active with the voltage applied at
the power contacts of the vehicle interface connector.
Operating Mode
Unpowered
Unpowered or Low Power
Low Power
Low Power or Intercom
Intercom

Voltage Range
TTH
TTH Series 2
0.0 – 5.8 VDC
0.0 – 13.5V
5.8 – 6.1 VDC
-6.1 – 11.0 VDC
-11.0 – 13.5 VDC
-13.5 – 32.0 VDC
13.5 – 32.0 VDC

Over Voltage
The headset shall survive and operate without malfunction when a pulse of
duration 100µs and potential 36V above ground is applied to the power line. The
pulse repetition rate shall not exceed 1 pulse every 10ms.
Ripple and noise
The headset shall operate through and reject power supply ripple up to 2.7V
peak to peak from 300 Hz to 4500 Hz. During exposure to ripple, the headset
shall not product any noise greater than 65 dB SPL.
Intercom Mode Operation (Standard Operating Mode)
When operating at Intercom Mode the headset shall have the following current
draw characteristics under any condition, except during turn-on:
Current Draw
TTH
TTH Series 2
At least 40ma but less
Less than 38mA
than 220 mA peak
peak
In Intercom Mode, the headset shall have the following functional characteristics:
Functional
Characteristics
Active ANR
Selectable Talk-through
Powered Output Level
Powered Frequency
Response
Active microphone
preamplifier output

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3
3
3
3
3

TTH
Series 2
3
3
3
3
Not
Applicable

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Low Power Mode Operation
When operating in Low Power Mode the headset shall have the following current
draw characteristics on the head in 85dBA red noise:
Current Draw
TTH
TTH Series 2
Less than 16mA RMS
Less than 16mA
and less than 180mA
peak under any
peak under any
condition, except
condition, except
during turn-on
during turn-on
In Low Power Mode, the headset shall have the following functional
characteristics:
Functional
Characteristics
Active ANR
Selectable Talk-through
Powered Output Level
Powered Frequency
Response
Inactive microphone
preamplifier output

TTH

TTH
Series 2

3
3
3
3

Not Applicable

Unpowered Mode Operation
When operating in Unpowered Mode the headset shall have the following current
draw characteristics on the head in 85dBA red noise:
Current Draw
TTH
TTH Series 2
Less than 1mA RMS Less than 1mA RMS
In Unpowered Mode, the headset shall have the following functional
characteristics:
Functional
Characteristics
Inactive ANR
Selectable Talk-through
Unpowered Output Level
Unpowered Frequency
Response
Inactive microphone
preamplifier output

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3
3
3
3
3

TTH
Series 2
3
3
3
3
Not
Applicable

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PTT Switch
The PTT switch shall provide the following function at the vehicle interface
connector:
Switch Position
Up, latching
Center, latching
Down, momentary

Function
PTT line (contact #2) connected to ground
(contact #3) through 470±5% ohms (power
dissipation in this resistor is less than 0.1W)
PTT line (contact #2) open circuit
PTT line (contact #2) connected to ground
(contact #3) through 10 ohms maximum

The boom microphone output signal shall not be muted or disconnected from the
vehicle interface connector in any PTT mode. The vehicle interface connector
shall conform to the pinouts described in Section 3.0 of this document.
Input Impedance
The headset shall not cause damage to the intercom audio circuits under any
circumstances. The audio input impedance of the headset assembly shall be as
follows:
Power Mode
Intercom and Low Power
Unpowered

Audio Input Impedance
500 ± 10% ohms
No less than 10 ohms

Insulation resistance
The insulation resistance of the headset assembly between any interconnection
terminals and any exposed metal cover shall not be less than 10 Megaohms.
Dielectric withstanding voltage
The headset assembly shall withstand, without flashover or breakdown, the
application of a 100Vrms alternating potential of commercial line frequency for 10
seconds.
Crosstalk
The headset assembly shall provide at least 60dB of separation between the
transmit (mic) and the receive (audio input) as well as the transmit (mic) and
power lines.

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Microphone preamplifier output (TTH only)
This section is only applicable to TTH. The TTH Series 2 product design does
not include an integrated microphone preamplifier output circuit.
TTH ONLY: In the Intercom Mode the boom microphone preamplifier circuit shall
provide an output capable of driving 200mVrms into an unbalanced load of
150±10% ohm AC impedance and not less than 300 ohms DC resistance. The
preamplifier shall provide a gain of 24±1dB with any dynamic microphone. The
preamplifier shall have a flat frequency response between 300 to 4500 Hz.
Harmonic distortion shall be less than 5% for an output of 100mVrms in 24dB
gain mode. The preamplifier shall be bypassed in the Low Power and
Unpowered modes.
Microphone Impedance
The electrical impedance of the microphone at any frequency over the range of
400 to 6000 Hz shall be such that the output voltage shall remain -56±4 dBm @
1kHz re. 103 dBSPL when connected to a 150 ohm load impedance.
Talk-through circuit (TTC)
The headset shall incorporate a talk-through circuit to permit monitoring of the
ambient sound field and direction finding. When mounted on a simulated real
head fixture (mannequin), at 22oC, 50% RH the TTC shall produce gain of 0±
6dB when measured in the 500 Hz octave band and an acoustic frequency
response within 0± 8dB when measured in one octave frequencies between 300
and 4500 Hz and corrected for diffuse field response of the fixture.
The talk-through circuit shall limit direct earcup output to between 86dB(A) SPL
maximum and 72dB(A) minimum with the output corrected for the diffuse field
response of the fixture.
The headset assembly shall accept a number 15A (AA) battery per ANSI C18.1
for operation of the TTC. When exposed to 90 dB, 1kHz noise field with a fresh
battery, the TTC shall provide the following battery life:
TTH
240 hrs
Minimum

Battery
life

TTH Series 2
240 hrs
Minimum

Audio Output Level
The headset at 22oC, 50% RH shall product an output level of 106±3dB SPL
corrected for the diffuse fields response of the fixture for a 0± 0.1dBV input audio
signal at 500Hz when in either the Intercom or Low Power Mode. With the
headset in the Unpowered Mode, the output level shall be 94±4dB SPL corrected
for the diffuse field response of the fixture in the octave around 500 Hz for a 0±
0.1dBV input audio signal.

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Harmonic Distortion
The harmonic distortion of the earphone assembly in Low Power and Intercom
Modes shall not exceed 5% for a 0± 0.1dBV input at 500 Hz and it shall not
exceed 10% with the input adjusted for an output of 100dB SPL at 500 Hz and
then swept from 300 Hz to 4500 Hz. The harmonic distortion of the earpohone
assembly in Unpowered Mode shall not exceed 5% for a -6± 0.1dBV input at 500
Hz and it shall not exceed 10% with the input adjusted for an output of 94dB SPL
at 500 Hz and then swept from 300 Hz to 4500 Hz.
Talk Through Circuit (TTC)
The headset shall incorporate a talk-through circuit to permit monitoring of the
ambient sound field and direction finding. When mounted on a simulated real
head fixture (mannequin), at 22oC, 50% RH the TTC shall produce gain of 0±
6dB when measured in the 500 Hz octave band and an acoustic frequency
response within 0± 8dB when measured in one octave frequencies between 300
and 4500 Hz and corrected for diffuse field response of the fixture.
The talk-through circuit shall limit direct earcup output to between 86dB(A) SPL
maximum and 72dB(A) minimum with the output corrected for the diffuse field
response of the fixture.
Boom Microphone Sensitivity
The dynamic boom microphone sensitivity shall be -56±4 dBm @ 1kHz re. 103dB
SPL.

Framingham, MA 01701-9168

SIZE
A

FSCM
32108

CLASS
RF

DWG NO.
273139

SHEET
25 of 25

REV.
01D

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Bose Rf273139_01D TTH Operators Manual Military Rf273139 01D

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