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SPECIFICATIONS
SYSTEM
RF Carrier Frequency
150 to 216 MHz (10 frequencies between 167.875 and
183.0 MHz offered; others available)
Frequency Stability
0.005%, Crystal-Controlled
Ultimate Quieting (ref. 12 kHz deviation)
>90 dB at 30m (100 ft); 60 dB, line-of-sight at 402m
(1/4 mi.)
Modulation
± 12 kHz deviation compressor-expander system with
pre- and de-emphasis
Distortion (ref. 12 kHz deviation)
Less than 0.3% THD, 50-15,000 Hz
Dynamic Range
98 dB A-weighted
92 dB unweighted
Audio Frequency Response
50 to 15,000 Hz, ± 1 dB
Audio Polarity
Positive pressure on microphone diaphragm results
in positive voltage on pin 2 with respect to pin 3 of
OUTPUT connector (with Shure WL83 or Shure low- or
high-impedance, XLR-connector microphone through
WA310 cable); negative voltage applied to tip of
WA300 cable connector results in same output polari-
ty
Temperature Range
Receiver . . . . . . . . . . . .
- 18° to 54°C (0° to 130°F)
Transmitter (alkaline batt.) . 0° to 38°C (32° to 100
o
F)
Transmitter (mercury batt.)
.
4° to 54°C (40° to 130°F)
Transmitter (carbon-zinc) . . . 7° to 32°C (45° to 90°F)
Certification
Type-accepted under FCC Parts 90 and 74
(FCC ID DD48NJW20R)
RECEIVER
RF Sensitivity
Less than 0.5 µV for 12 dB SINAD
Image Rejection
At least 75 dB
Spurious Rejection
At least 80 dB
Squelch Quieting
125 dB
Squelch Threshold
Internally preset to 1.0 µV
Output
-20 dB across 200 ohms maximum (mic level ad-
justable)
Antenna Input Impedance
50 ohms nominal
Antenna
1/4 wavelength, 457 mm (18 in.) whip, UHF connector
Power
13.5 Vdc nominal (negative ground); 200 mA external
power converter supplied
Dimensions
42.8 mm H (plus feet) x 190 mm W x 173 mm D (1-11/16
in. x 7-1/2 in. x 6-13/16 in.) (depth is 190 mm–7-1/2 in.
including controls and connectors)
Weight
723 grams (1 lb 9-1/2 oz)
TRANSMITTER
RF Power Output
50 mW maximum; 30 mW typical
Modulation
54F3 ± 12 kHz deviation, 50 µsec pre-emphasis
Modulation Limiter
internal compressor
Input Impedance
Actual:
16k (20k dc), pin 4 wired to pin 3 for WL83
microphone; 91k, pin 4 open for microphone or instru-
ment pickup
Gain Switch
High position . . . . . . . .
0.0065 Vrms required for
100% modulation
Low position . . . . . . . . .
0.065 Vrms required for
100% modulation
Gain Adjustment Range
Low Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 dB
High Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 dB
Antenna
Attached, 305 mm (12 in.), omnidirectional, flexible
wire
Power
Battery Type . . . . . . . . .
9-volt alkaline (NEDA
1604A); 8.4-volt nicad op-
tional
Battery Life . . . . . . . . . . 6 to 8 hours typical
(alkaline); 1.5 to 2 hours
typical (8.4-volt nicad; per
charge)
Current Drain . . . . . . . . 35 mA typical
Dimensions
102 mm H x 69.8 mm W x 25.4 mm D (4 in. x 2-3/4 in. x 1
in.) (not including antenna, controls and belt clip)
Weight
113 grams (4 oz); 170 grams (6 oz) with battery
12