Mark IV Electro-Voice 903E User Manual

SPECIFICATIONS
(Per RTCA/DO-170)
Generating Element:
Electret Condenser
Frequency Response:
300-5,000 Hz - see Figure 1
Polar Pattern:
Pressure gradient
(differential close-talking)
Impedance:
Matches standard aircraft
carbon circuitry
DESCRIPTION
The Electro-Voice model 903E condenser
handheld microphone iS designed for use m
high noise environments where high speech
intelligibility is desired such as in aircraft
cockpits, passenger cabins, control towers or
terminal areas.
The electret element virtually eliminates EMI,
RFl. and magnetic signals channeling the full
power of your communications system into
crisp, articulate voice transmission with the
RTCA frequency response.
Sensitivity:
400 mV ±3 dB for
114 dB re 20/i pascals
(normal speech)
(output of built-in amplifier)
Power Requirements.
See test circuit Figure 3
(operates into carbon microphone circuit)
Current Drain:
11 ma at 8 V dc (12-volt system)
27 ma at 16 V dc (24*volt system)
Case Material:
Black A3S
Dimensions:
91.5 mm (3.6 in,) length, less hanger
61.0 mm (2.4 in.) width
35.6 mm (1.4 in.) depth
Weight:
180 grams
Accessories Supplied:
Panel mounting bracket (8474)
Certification;
FAA TSO C-58a
The microphone is recommended for
advanced technology air transports
employing electronic flight insUumentation
systems (glass cockpits). Its proven electret
technology will not decay or deteriorate in
any way over extended periods.
Features:
• Highly reliable
• EMI and RFl protected
• Tailored voice response tor
high articulation per RTCAyDO-l70
• Immune to aircraft generated
magnetic fields
• Greater durability
• Lightweight
• 903-1341 (with PJ-068 connector)
• 903-1342 (with A4M connector)
WARRANTY (Limited)
Electro-Voice .Aircraft Microphones are
guaranteed for a period of thirty-six m.onths
from date of original purchase acamst
malfunction due to defects in workmarsnip
and materials. If such malfunction occurs,
microphone will be repaired or replaced (at
our option) without charge for materials or
labor if delivered prepaid to the proper
Electro-Voice service facility Unit will be
returned prepaid Warranty does not extend
to finish, appearance itemis. cables, cade
connectors, switches or malfunction due to
abuse or operation under other than
specified conditions, nor does it extend to
incidental or consequential damages Some
states do not allow the exclusion or limitation
of incidental or consequential damages, so
the above exclusion may not apply to you
Repair by other than Electro-Voice or its
authorized service agencies will void this
guarantee. This warranty gives you specific
legal rights, and you may also have other
rights which vary from state to state
Service and repair address for this product:
Electro-Voice. Inc.. 600 Cecil Street.
Buchanan, Michigan 49107.
Specifications subject to change
without notice