Lectrosonics WM

Dual AA batteries provide twice the operating time of earlier watertight transmitter designs. Larger membrane switches and control panel and a highly visible, backlit LCD enhance the user interface.

To meet the demand for both extended operating range and extended battery life, the transmitter offers select- able output power of 50, 100 and 250 mW. With higher power output, the operating range is improved at the expense of battery life. When range is not an issue, the power can be reduced to extend the battery life.

The transmitter can be controlled by the RM and RM2 remote control units for hands free setup and adjustment using audible tones delivered into the microphone from a tiny loudspeaker in the remote control unit. The transmit- ter can be put to sleep to conserve battery power during setup when it is buried deep inside costuming, then awakened for normal operation when the production begins. Other adjustments include frequency, audio level and control panel lockout.

The DSP-based design works with all Digital Hybrid re- ceivers, and is backward compatible for use with Lectro- sonics 200 and 100 Series and IFB receivers and some other brands of analog wireless receivers. The input section features servo bias circuitry with voltages being selectable from the LCD to match the requirements of a wide variety of lavaliere microphones. The bias can also be turned off for use with dynamic microphones. A line level setting is provided for use with signal levels up to 5 volts. The low frequency roll-off can be adjusted from 35 to 150 Hz.

A DSP-controlled analog audio limiter is employed ahead of the first mic preamp to protect the entire audio chain from overload. The limiter has a range of more than 30 dB for excellent overload protection and a dual release envelope that makes the limiter acoustically transparent while maintaining low distortion.

• Selectable output power to maximize battery life or operating range (50, 100 or 250 mW)

• Machined aluminum, corrosion resistant housing

• Water resistant seals for use in wet environments

• LCD interface with lockout option

• Programmable compatibility modes for use with a wide variety of different receivers

• Servo Bias input circuitry with selectable voltage

OPERATING FREQUENCIES:

• Block 470 : 470.100 - 495.600

• Block 19 : 486.400 - 511.900

• Block 20 : 512.000 - 537.500

• Block 21 : 537.600 - 563.100

• Block 22 : 563.200 - 588.700

• Block 23 : 588.800 - 607.900, 614.100 - 614.300

• Block 24 : 614.400 - 639.900

• Block 25 : 640.000 - 665.500

• Block 26 : 665.600 - 691.100

CHANNEL SPACING:

100 kHz

FREQUENCY SELECTION:

Control panel mounted membrane switches

RF POWER OUTPUT:

Switchable; 50, 100 or 250 mW

COMPATIBILITY MODES (6):

Digital Hybrid Wireless (400 Series), 200 Series, 100 Series, Mode 3, Mode 6, IFB

PILOT TONE:

25 to 32 kHz; 5 kHz deviation (in 400 Series Hybrid Mode)

FREQUENCY STABILITY:

± 0.002%

DEVIATION:

± 75 kHz max. (in 400 Series Mode)

SPURIOUS RADIATION:

60 dB below carrier

EQUIVALENT INPUT NOISE:

-125 dBV, A-weighted

INPUT LEVEL:

• Dynamic mic: 0.5 mV to 50 mV before limiting. Greater than 1 V with limiting.

• Electret lavaliere mic: 1.7 uA to 170 uA before limiting. Greater than 5000 uA (5 mA) with limiting.

• Line level input: 17 mV to 1.7 V before limiting. Greater than 5 V with limiting.

• Input impedance: Dynamic mic: 300 Ohms, Electret lavaliere: Input is virtual ground with servo adjusted constant current bias, Line level: >2.7 k Ohms

INPUT LIMITER:

Soft limiter, 30 dB range

BIAS VOLTAGES:

Selectable; 2V, 4V and Off

GAIN CONTROL RANGE:

44 dB; panel mounted membrane switches

MODULATION INDICATORS:

Dual bicolor LEDs indicate modulation of -20, -10, 0, +10 dB referenced to full modulation

CONTROLS:

Control panel with LCD and four membrane switches

TOTAL HARMONIC DISTORTION:

0.2% typical (400 Series mode)

AUDIO INPUT JACK:

2.5 mm locking micro; threaded for stainless sleeve on WP connector

ANTENNA:

Flexible, unbreakable steel cable.

BATTERIES:

1.5 Volt AA lithium

WEIGHT:

5.33 oz.. (151 grams) with lithium batteries

HOUSING DIMENSIONS:

2.98 x 2.55 x 0.77 inches 75.7 x 64.8 x 19.6 mm