MM400c Transmitter
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Water-Resistant Digital Hybrid Wireless® Miniature Transmitter
The rugged, water resistant MM400C is based on Digital
Hybrid Wireless® technology, a revolutionary new design
that combines 24-bit digital audio with an analog FM
radio link. The result is outstanding audio quality plus
the extended operating range of the best analog wireless
systems in a package that can withstand the most
extreme moisture and temperature environments.
The MM400C is conveniently powered by a single AA
battery, with internal switching power supplies providing
constant voltages to the transmitter circuits from the
beginning (1.5 volts) to the end (0.85 volts) of battery life.
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The 100 mW output with an RF circulator/isolator in the
output stage provides excellent operating range while
virtually eliminating intermodulation problems common in
multichannel environments.
Digital Hybrid Wireless® is a revolutionary new design
that combines digital audio with an analog FM radio link to
provide outstanding audio quality and the exemplary RF
performance of the finest analog wireless systems.
This overcomes channel noise in a dramatically new way,
digitally encoding the audio in the transmitter and decoding
it in the receiver, yet still sending the encoded information
via an analog FM wireless link. This proprietary algorithm
is not a digital implementation of an analog compandor.
Instead, it is a technique which can be accomplished only
in the digital domain.
The process eliminates compandor artifacts, expanding the
applications to include test and measurement of acoustic
spaces and musical instruments.
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 and 614.100 - 614.300
Block 24 614.400 - 639.900
Block 25 640.000 - 665.500
Block 26 665.600 - 691.100
Frequency selection: 256 frequencies in 100 kHz steps
RF Power output: 100 mW (nominal)
Pilot tone: 25 to 32 kHz; 5 kHz deviation (in 400 Series Mode)
Frequency stability: ± 0.002%
Deviation: ± 75 kHz max. (in 400 Series Mode)
Spurious radiation: 60 dB below carrier
Equivalent input noise: -118 dBV, A-weighted
Input level: Nominal 2 mV to 300 mV, before limiting. Greater than 1.5V maximum, with limiting.
Input impedance: 2 kOhm
Input limiter: Soft limiter, >30 dB range
Gain control range: 43 dB; semi-log rotary control
Modulation indicators: Dual bicolor LEDs indicate modulation of -20, -10, 0, +10 dB referenced to full
modulation.
Low frequency roll-off: -12 dB/octave; 70 Hz
Controls: Front panel knob adjusts audio gain. Rotary switches on bottom panel adjust transmitter frequency.
Audio Frequency Response: 80 Hz to 20 kHz, ±1dB, -3 dB @ 70 Hz (The audio is deliberately rolled off at 70 Hz
using a 12 dB/octave filter. This filter cannot be disabled.)
Total Harmonic Distortion: 0.2% typical (400 Series mode)
Audio Input Jack: 2.5 mm Microjack (matches Switchcraft 850 Microplug)
Antenna: Detachable, flexible galvanized steel with SMA connector. (50 Ohm antenna port also allows connection to test equipment.)
Battery: 1.5 Volt AA lithium recommended
Battery Life: 1.5 hours (alkaline); 5.5 hours (lithium); 4.5 hours (2500 mAh) NiMH
Weight: 3.6 ozs. (102 grams) with lithium battery, no antenna
Overall Dimensions: 3.03 x 2 x 0.69 inches (not including microphone or antenna)
Emission Designator: 180KF3E
Specifications subject to change without notice.
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