7
Audio Gain Adjustment Range
40 dB
Input Impedance
Actual: 17 k
Ω
, pin 4 wired to pin 3 for WL93 or other wireless
condenser microphone; 100 k
Ω
, pin 4 open for dynamic micro-
phone or instrument pickup
Power Requirements
Battery Type: 9 volt alkaline (Duracell 1604 or equivalent)
8.4-volt nicad optional
Battery Life: 7 hours minimum (alkaline)
1.5 to 2 hours typical (nicad, per charge)
Current Drain: 55 mA typical
Antenna
Attached, 15.2 in. (386 mm), flexible wire
Modulation Limiter
Internal compressor
Audio Polarity
EC1 Transmitter with Shure Wireless Microphones:
Positive pressure on microphone diaphragm produces positive
voltage on pin 2 with respect to pin 3 of low-impedance output,
and on tip with respect to ground of aux output.
EC1 Transmitter with WA302 or WA310 Cable:
Positive voltage applied to tip of WA302 phone plug or to pin 3
of WA310 XLR connector results in positive voltage at pin 2 with
respect to pin 3 of low-impedance output or on trip with respect
to ground of aux output.
Dimensions (excluding antenna and belt clip)
82.6 mm High x 63.5
mm Wide x 26.2 mm Deep
(3
1
/
4
in. x 2
1
/
2.
in. x 1
1
/
32
in.)
Weight
Without Battery: 96.4 g (3.4 oz)
With Battery: 142 g (5 oz)
Certification
Complies with FCC Parts 74 and 90 (FCC ID: DD4L11)
Conforms to European Union Directives, eligible to bear CE
marking; meets European EMC Immunity Requirements (EN
50 082-1, 1992); ESD (IEC 801-2); RF radiated (IEC 801-3);
EFT (IEC 801-4).
EC2 TRANSMITTER
RF Power Output
50 mW maximum
Modulation
FM (60K0F3E)
±
15 kHz deviation, 62
µ
s pre-emphasis
Modulation Limiter
Internal compressor
Audio Polarity
Positive pressure on microphone diaphragm produces positive
voltage on tip (with respect to ground) of unbalanced output,
and on pin 2 (with respect to pin 3) of balanced output
Audio Gain Adjustment Range
15 dB (2-position switch); additional –6 dB internal pad
Antenna
Removable, external
1
/
4
-wave helical antenna (antenna is col-
or-keyed to transmitter frequency range).
Power Requirements
Battery Type: 9 volt alkaline (Duracell MN1604 or equivalent)
8.4-volt nicad optional
Battery Life: 7 hours minimum (alkaline)
1.5 to 2 hours typical (nicad, per charge)
Current Drain: 55 mA typical
EC2 Transducer Type
EC2/58, EC2/Beta 58: Dynamic
EC2/87, EC2/Beta 87: Electret bias condenser
EC2 Polar Patterns (See Figure 10)
Uniform with frequency, symmetrical about axis
Cardioid (EC2/58)
Supercardioid (EC2/Beta 58, EC2/87, EC2/Beta 87)
TYPICAL POLAR PATTERNS
FIGURE 10
