SPECIFICATIONS
Type
Cardioid condenser (electret bias) for surface
mounting
Frequency Response
20 to 20,000 Hz at 30° incidence to infinite surface
(see Figure 1)
TYPICAL FREQUENCY RESPONSE
FIGURE 1
Polar Pattern
Half-cardioid (cardioid in hemisphere above mounting
surface), uniform with frequency, symmetrical about
axis (see Figure 2)
TYPICAL POLAR PATTERN
FIGURE 2
Output Impedance
Rated at 150 ohms (90 ohms actual)
Recommended minimum load impedance: 800 ohms
(May be used with loads as low as 150 ohms with
reduced clipping level)
Output Level
(at 1,000 Hz, measured with sound source
at 30° incidence to infinite surface)
Open Circuit Voltage . . . . . . . . . . . -71.5 dB (0.27 mV)
0 dB = 1 V/µbar
Preamplifier Output Clipping Level
(at 1,000 Hz, less
than 0.1% THD)
800 ohm load
. . . . . . . . . . . . . . . . . . . . . . .
0 dBV (1.0V)
150 ohm load
. . . . . . . . . . . . . . . . . . .
-13 dBV (0.22V)
Maximum SPL (at 1,000 Hz, sound source at 30° in-
cidence to infinite surface)
800 ohm load . . . . . . . . . . . . . . . . . . . . . . . . . .
146.5 dB
150 ohm load . . . . . . . . . . . . . . . . . . . . . . . . . .
136.5 dB
Hum Pickup
-13.5 dB equivalent SPL in 1 m0e field (60 Hz)
Output Noise
25.5 dB SPL, A-weighted
28.5 dB SPL, weighted per DIN 45 405
Signal-to-Noise Ratio
68.5 dB re 94 dB SPL
Dynamic Range
121 dB
Phasing
Positive pressure on diaphragm produces positive
voltage on pin 2 relative to pin 3 of preamplifier output
connector.
Power
Battery:
Two 9-Vdc alkaline (NEDA 1604A), approxi-
mately 300 hours continuous with fresh alkaline bat-
teries
Simplex Voltage:
11 to 52 Vdc, operational down to
9 Vdc; 1.8 mA current drain; permissible to use
simplex power with batteries in place or removed
Switches and Indicator
Two recessed slide switches and green LED indicator
on top surface of preamplifier assembly
Battery On/Off Switch:
Move to On to power from
batteries or to use batteries as backup power in case
of interruption to external power supply (no battery
drain occurs as long as simplex voltage source is
greater than battery voltage). Move to Off to prevent
battery drain when unit is not in use.
LED Indicator: Green LED flashes momentarily
when switch is moved to On to indicate at least 8
hours of battery life remaining.
Flat/Lo Cut Switch:
In Flat position, 6 dB/octave
rolloff below 30 Hz; In Lo Cut position, 12 dB/octave
rolloff below 80 Hz (see Figure 1)
Cable
7.6m (25 ft) two-conductor shielded, small diameter,
interconnecting cable with 3-socket miniature Switch-
craft connector on each end to mate with microphone
output connector and preamplifier input connector
Case
Microphone:
Matte black enamel die-cast base and
perforated steel grille with replaceable or cleanable
fine mesh screen and foam pad wind/dirt barrier
Preamplifier: Matte black enamel die-casting
Dimensions
See Figure 3
OVERALL DIMENSIONS
FIGURE 3
Environmental Conditions
Operating Temperature:
-18° to 57°C (0° to 135°F)
Storage Temperature:
-29° to 74°C (-20° to 168°F)
Relative Humidity (Operating or Storage):
0 to 95%
Net Weight
Microphone:
263 grams (9.3 oz) less cable
Preamplifier: 435 grams (15.4 oz) less batteries
-2-
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