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OPERATION
No special precautions beyond ordinary care are
necessary in operation of 401 microphones. They will
function very satisfactorily under all ordinary condi-
tions of humidity, heat, and cold. Dropping the
microphones or other severe mechanical shocks should
be avoided.
SPECIFICATIONS
Type
CONTROLLED MAGNETICB
Frequency Response
200 to 4,000 Hz (see Figure 3)
I
I
Y
I
1
I
1 1 1 1 1 1
I
l
1
l l l l l l
1
I
20
50
1 0 0
lpo0
l0.000
n o w
FREQUENCY
IN
HERTZ
TYPICAL FREQUENCY RESPONSE
FIGURE 3
lmpedance (at 1,000 Hz)
401A- Microphone impedance is "High"
401B-Microphone
rating impedance is 150 ohms
(200 ohms actual)
Load lmpedance Range
MINIMUM
RECOMMENDED
. . . . . . . . . . . . . . . .
401A
15 kilohms
100 kilohms
. . . . . . . . . . . . . . . .
4018
150 ohms
1,000 ohms
Output Level (at 1,000 Hz)
A01 A
401 B
-
. . . . . . .
Open Circuit Voltage*
-13.0 dB
-31.5 dB
(224 mV)
(26.6 mV)
Power Level
*
*
. . . . . . . . . . . . . .
- 53.0 dB
*O dB
=
1 volt per 100 microbars
* * 0 dB
=
1 milliwatt per 10 microbars
Switch
Built in, push-to-talk, double-pole double-throw, to
control microphone circuit and relay circuit
Cable
401A-1.5m
(5 ft) three-conductor, one conductor
shielded, attached, coiled cable
401 B - 1.8m (6 ft) four-conductor, two conductors
shielded, attached, coiled cable
Mounting Bracket
Supplied (see Figure 1)
Case
Blue, high-impact ARMO-DURn
Dimensions
See Figure 4
OVERALL DIMENSIONS
FIGURE 4
Net Weight
340 grams (12 oz)
Packaged Weight
510 grams (1 Ib, 2 oz)
FURNISHED ACCESSORY
. . . . . . .
Mounting Bracket (3 in replacement kit)
RK6MB
OPTIONAL ACCESSORY
. . . . . . . . . . . . . .
Line Matching Transformer
A95 Series
REPLACEMENT PARTS
401 A
401 B
-
-
Cartr,idge
. . . . . . . . . . . . . . . . . . . .
R5D
R5E
. . . . . . . . . . . . . . . . . . . . . . .
Cable
70A436*
70A481
On-Off Switch
. . . . . . . . . . . . . . . .
RK28H
R K28 H
. . . . . . . . . . . . . . . .
Switch Button
65A189A
65A189A
'44A115 S p r ~ n g not included.
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