Bose TriPort TTH Manual, Operating & Maintenance - Page 24
Browse online or download pdf Manual, Operating & Maintenance for Headsets Bose TriPort TTH. Bose TriPort TTH 25 pages. Tactical headsets
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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
o
head fixture (mannequin), at 22
C, 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
TTH Series 2
Battery
240 hrs
240 hrs
life
Minimum
Minimum
Audio Output Level
o
The headset at 22
C, 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.
SIZE
FSCM
CLASS
DWG NO.
SHEET
REV.
Framingham, MA 01701-9168
A
32108
RF
273139
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