Lectrosonics MM400c - Manual (Page 18)

MM400C
LECTROSONICS, INC. 18
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
Block 27 691.200 - 716.700
Block 28 716.800 - 742.300
Block 29 742.400 - 767.900
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
Specifications and Features
The FCC requires that the following statement be included in this manual:
This device complies with FCC radiation exposure limits as set forth for an uncontrolled
environment. This device should be installed and operated so that its antenna(s) are
not co-located or operating in conjunction with any other antenna or transmitter.
Emission Designator: 180KF3E
Specifications subject to change without notice.
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.)
Signal to Noise Ratio (dB):
(overall system, 400 Series mode)
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)
(Note: the dual envelope “soft”
limiter provides exceptionally
good handling of transients
using variable attack and release
time constants. The gradual onset of limiting in the design begins below full
modulation, which reduces the measured figure for SNR without limiting by 4.5 dB)
SmartNR No Limiting w/Limiting
OFF 103.5 108.0
NORMAL 107.0 111.5
FULL 108.5 113.0