MM400C
Lectrosonics
MM400C
Lectrosonics MM400C Transmitter
This rugged, water resistant transmitter is based on Digital Hybrid WirelessTM technology, combining 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 design overcomes transmission noise in a dramatically new way, digitally encoding the audio bitstream in the transmitter and decoding it in the receiver, yet sending the encoded information via an analog FM wireless link.
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. 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. The 4.5 hour battery life (lithium) is comparable to standard transmitter models operating on 9V batteries.
The design overcomes transmission noise in a dramatically new way, digitally encoding the audio bitstream in the transmitter and decoding it in the receiver, yet sending the encoded information via an analog FM wireless link.
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. 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. The 4.5 hour battery life (lithium) is comparable to standard transmitter models operating on 9V batteries.
Product Weight: 3.6 oz with lithium battery, no antenna
Dimensions: 3.04"H x 1.99"W x 0.69"D (from antenna jack to battery cover)
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Manufacturer Specs
Note: Some specifications apply only when the MM400C is operating in 400 Series mode.
Operating Frequencies (MHz):
537.600 - 607.900
614.100 - 767.900
537.600 - 805.600 (export)
Digital latency: 1.5 mS (transmitter only), 3.2 mS (system) with 400 Series Rx
Frequency selection: 256 frequencies in 100kHz steps
RF Power output: 100 mW (nominal)
Pilot tone: 25 to 32 kHz; 5kHz deviation; unique pilot tone frequency for each selected carrier frequency, (400 Series mode)
Frequency stability: ± 0.002%
Deviation: ± 75 kHz (max), (400 Series mode)
Spurious radiation: 90 dB below carrier
Audio Input Jack: 2.5 mm micro jack (matches Switchcraft 850 Microplug); accepts Lectrosonics watertight plug, locking micro plug and non-locking plug
Equivalent input noise: –118 dBV
Input level:
Nominal 2 mV to 300 mV, before limiting.
Greater than 1 V maximum, with limiting.
Input impedance: 2 kΩ
Input limiter: DSP controlled, dual envelope “soft” limiter; greater than 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.
Audio Performance (overall system):
Frequency Response: 32 Hz to 20 kHz (+/-1dB), overall system (400 Series mode); LF roll-off is 12dB per octave, -3dB at 70 Hz in the MM400C
Input Dynamic Range: 125 dB (with full Tx limiting)
Low frequency roll-off: –12dB/octave; 70 Hz
THD: 0.2% (typical), (400 Series mode)
SNR at receiver output (dB) (400 Series mode):
SmartNR No Limiting w/Limiting
OFF 103.5 108.0
NORMAL 107.0 111.5
FULL 108.5 113.0
Controls:
Control panel knob adjusts audio gain.
Rotary switches on bottom panel adjust transmitter frequency.
Watertight, magnetic Power On/Off switch
Antenna: Flexible braided steel cable
Battery:
1.5 Volt AA lithium (recommended)
1.5 Volt AA alkaline
1.2 Volt AA NiMH rechargeable
Battery Life (Typical):
Lithium: over 6 hrs
Alkaline: 1.75 hrs
NiMH: 3.5 hrs (with 2200 mAh battery)
Emission Designator: 180KF3E
Operating Frequencies (MHz):
537.600 - 607.900
614.100 - 767.900
537.600 - 805.600 (export)
Digital latency: 1.5 mS (transmitter only), 3.2 mS (system) with 400 Series Rx
Frequency selection: 256 frequencies in 100kHz steps
RF Power output: 100 mW (nominal)
Pilot tone: 25 to 32 kHz; 5kHz deviation; unique pilot tone frequency for each selected carrier frequency, (400 Series mode)
Frequency stability: ± 0.002%
Deviation: ± 75 kHz (max), (400 Series mode)
Spurious radiation: 90 dB below carrier
Audio Input Jack: 2.5 mm micro jack (matches Switchcraft 850 Microplug); accepts Lectrosonics watertight plug, locking micro plug and non-locking plug
Equivalent input noise: –118 dBV
Input level:
Nominal 2 mV to 300 mV, before limiting.
Greater than 1 V maximum, with limiting.
Input impedance: 2 kΩ
Input limiter: DSP controlled, dual envelope “soft” limiter; greater than 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.
Audio Performance (overall system):
Frequency Response: 32 Hz to 20 kHz (+/-1dB), overall system (400 Series mode); LF roll-off is 12dB per octave, -3dB at 70 Hz in the MM400C
Input Dynamic Range: 125 dB (with full Tx limiting)
Low frequency roll-off: –12dB/octave; 70 Hz
THD: 0.2% (typical), (400 Series mode)
SNR at receiver output (dB) (400 Series mode):
SmartNR No Limiting w/Limiting
OFF 103.5 108.0
NORMAL 107.0 111.5
FULL 108.5 113.0
Controls:
Control panel knob adjusts audio gain.
Rotary switches on bottom panel adjust transmitter frequency.
Watertight, magnetic Power On/Off switch
Antenna: Flexible braided steel cable
Battery:
1.5 Volt AA lithium (recommended)
1.5 Volt AA alkaline
1.2 Volt AA NiMH rechargeable
Battery Life (Typical):
Lithium: over 6 hrs
Alkaline: 1.75 hrs
NiMH: 3.5 hrs (with 2200 mAh battery)
Emission Designator: 180KF3E