Lectrosonics MM400c User Manual download pdf (Page 18)

MM400C

LECTROSONICS, INC.

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

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Lectrosonics MM400c User Manual Page 18

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