LBI-39181
4
SPECIFICATIONS
(Test conditions unless otherwise specified: audio
output measured between pin 2 and ground; PTT switch
depressed; no hang-up button connection; mic and DTMF
level trimmers full clockwise; dc VTVM 10 M
Ω
or greater
input impedance; ac VTVM 1 M
Ω
or greater input
impedance.)
Type
Electret condenser (with transistor preamplifier, DTMF
signaling circuitry, illuminated keypad)
Figure 1 - Typical Frequency Response
Frequency Response
200 to 4,000 Hz (see Figure 1)
Polar Pattern
Omnidirectional
Output Level (at 1,000 Hz, 1 cm)
-6.0 dB (V+ = 12 V) (0 dB = 1 V per 100
µ
bars)
DC Supply Current
4.0 mA at 12 V
Hum Sensitivity
-94 dBV maximum in 1 Oe 60 Hz field (mic level
control full counterclockwise)
DTMF Output Level
1.0 V peak-to-peak
Audio Polarity
Positive sound pressure produces positive voltage at pin
6 of modular connector with respect to ground
Environmental Conditions
Operating Temperature: -40
°
to 60
°
C (-40
°
to 140
°
F)
Storage Temperature: -54
°
to 85
°
C (-65
°
to 185
°
F)
Relative Humidity 0 to 95% (non-condensing)
Microphone Connector
6-conductor modular telephone type
PTT Switch Assembly
Mechanical: Double-pole, single-throw, leaf-type, normally
open.
Electronic:
Open NPN transistor collector to ground;
positive polarity only; maximum on-state
current 100 mA to produce 0.6 V or less;
maximum off-state voltage 40 V.
Cable
Detachable, 1.4 m (48 in.), 5-conductor (1 shielded),
vinyl-rubber-jacketed coil cord with modular plug on
microphone end
Construction
Case
Black textured high-impact ARMO-DUR
Switch Button
Black ARMO-DUR
Keypad
Molded silicone rubber
Dimensions
See Figure 2
Net Weight
160 grams (5.6 oz)
MOUNTING
The microphone is provided with a rear-case hang-up
button for use with a grounded mounting bracket on or near
associated equipment. Grounding of the bracket is the
customer's responsibility. Heavy-duty, chrome-plated
mounting brackets are available Part No. 344A4678P1.