Lectrosonics LT Datasheet

LT

Belt Pack Transmitter

• Covers three standard frequency bands

• Digital Hybrid Wireless

• Selectable 50 or 100mW output power

• Compatibility modes for use with analog receivers

• 25 or 100 kHz tuning steps for up to 3072 selectable frequencies

• Integrated multi-function switch for mute or talkback modes

• Wide range input gain control in 1 dB steps

• IR port for setup with IR enabled receivers

• USB port for firmware updates

• Menu selectable mic or instrument input

• Optional battery eliminator

• Detachable antenna

®

for compandor-free audio

TECHNICAL DATA

The LT transmitter offers a full set of professional fea­tures in a compact, rugged package. The unit is compat­ible with all Digital Hybrid Wireless® receivers and even
some from other manufacturers, making it comfortable
in a wide variety of applications from video production to
theater, stage and house of worship.

The LT can be configured to operate as a “one touch”
device with a single power on/off switch on the top panel,
or with full access to all operational parameters using
the side panel membrane switches and LCD interface.
The top panel switch can also be configured to provide a
mute or talkback function.

Frequencies are selectable in 100 kHz or 25 kHz steps,
yielding a total of up to 3072 available frequencies
across three standard frequency blocks.* An IR port on
the membrane panel enables automatic setup when
coupled with an IR enabled receiver. A USB port on the
side panel allows firmware updates to be made easily.

The servo bias input accepts mic or line level signals
with a wide range of gain adjustment in 1 dB steps. A
menu selectable instrument level input is available on the
LCD. Accurate LED indications on the top panel and a
bar graph indicator on the LCD allow precise gain adjust­ments to be made for the maximum signal to noise ratio
and minimum distortion.

The limiter in the preamp can cleanly handle signal
peaks over 30 dB above full modulation, allowing the in­put gain to be set high enough to achieve the maximum
signal to noise ratio with no risk of overload distortion.

The unit is powered by two AA batteries or an optional
battery eliminator that replaces the hinged battery door.
A wire and a spring loaded belt are available.

The housing is machined from a solid aluminum billet,
finished with an ultra hard, black electroless nickel finish
called ebENi.

*Total available frequencies varies slightly by block

Rio Rancho, NM, USA
www.lectrosonics.com

m

Specifications

Operating Frequencies:
Band A1: 470.100 - 537.575
Band B1: 537.600 - 614.375
Band C1: 614.400 - 691.175

Frequency Selection Steps: Selectable; 100 kHz or 25 kHz
RF Power output: Selectable: 50 or 100mW
Pilot tone: 25 to 32 kHz; 5 kHz deviation

(Digital Hybrid mode)
Frequency Stability: ± 0.002%
Deviation: ± 75 kHz max. (Digital Hybrid mode)
Spurious radiation: 60 dB below carrier
Equivalent input noise: –120 dBV (A-weighted)
Input level:

Mic: • Nominal 2 mV to 300 mV, before limiting
Greater than 1V maximum, with limiting.
Instrument: • 1M Ohm high level

Input impedance: 2k Ohm
Input limiter: DSP controlled, dual envelope “soft” limiter

with greater than 30 dB range
Gain control range: 44 dB; digital control
Modulation indicators: • Dual bicolor LEDs indicate modulation of

-20, -10, 0 and +10 dB referenced to full
modulation

• LCD bar graph
Audio Performance (Digital Hybrid mode)
Frequency Response: 35 Hz to 20 kHz, +/-1 dB, low frequency roll

off can be set for 3 dB down points at 35,
50, 70, 100, 120 or 150 Hz

THD: 0.2% (typical)
SNR at receiver output:

Note: The dual envelope “soft”
limiter provides exceptionally good
handling of transients using variable
attack and release time constants. Once activated, the limiter compresses
30+ dB of transmitter input range into 4.5 dB of receiver output range, thus
reducing the measured figure for SNR without limiting by 4.5 dB

Controls: • Top panel slide switch; programmable as
power, mute, talkback or no (off) function

• Side panel membrane switches with LCD
interface for power on/off and all setup and
configuration controls

Audio Input Jack: Switchcraft 5-pin locking (TA5F)
Antenna: Galvanized steel, flexible wire
Battery: Two AA; alkaline, lithium, NiMH rechargeable
Battery Life: • Duracell Quantum: 4.75 hours

• Eneloop 2400 mAH NiMH: 5.5 hours
Weight: 5.9 ounces (169 grams), with alkaline AA batteries
Dimensions: 2.85 x 2.45 x .75 in. (72 x 62 x 19 mm)
Emission Designator: 180KF3E

SmartNR No Limiting w/Limiting
OFF 103.5 108.0
NORMAL 107.0 111.5
FULL 108.5 113.0

-10

AUDIO

-20

PWR/FUNC

The top panel provides the antenna port,
audio level LEDs, programmable switch
and input jack.

A machined aluminum, hinged door maintains
reliable battery contact.

A USB port on the side panel is used for
firmware updates.

Digital Hybrid Wireless® is a patented design
that combines 24-bit digital audio with an
analog FM radio link to provide outstanding
audio quality and the extended operating
range of the finest analog wireless systems.

The design overcomes channel noise in a
dramatically different 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, even
though the audio inputs and outputs are
analog signals.

*US Patent 7,225,135

581 Laser Road NE • Rio Rancho, NM 87124 USA • www.lectrosonics.com
[phone] • [phone] • fax [phone] • [e-mail]

21 December 2015

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