Lectrosonics DBSM-A1B1 Digital Transmitter with Recorder, Time Code, Single AA, 470-608 MHz

The DBSM and DBSMD digital transcorders were developed specifically for the needs of the film industry and offer time code jam sync capability. They offer hands free setup and adjustment using audible tones and can be put to sleep to conserve battery power during setup while buried inside costuming, then awakened for normal operation when the production begins. Other features include input gain adjustment in 1 dB increments over a 44 dB range and adjustable low frequency audio roll-off for 3 dB down points at 20, 35, 50, 70, 100, 120 or 150 Hz to control subsonic and very low frequency audio content. The transmitters also offer selectable output power of 10, 25 and 50 mW. A special high-density (HDM) transmit mode at 2 mW allows for ultra-tight channel spacing without concern for frequency coordination.

The input section features the unique Lectrosonics servo bias input circuitry with a standard TA5M type jack for use with electret lavaliere mics, dynamic mics, or line level signals. A DSP-controlled analog audio limiter is employed ahead of the first mic preamp to protect the entire audio chain from overload. The limiter has a range of more than 30 dB for excellent overload protection, and a dual release envelope that makes the limiter acoustically transparent while maintaining low distortion of brief transients and longer duration peaks.

A water resistant control panel with OLED, membrane switches and multi-color LEDs make input gain adjustments, frequency and compatibility mode selection quick and accurate. The battery compartment accepts industry-accepted AA batteries (lithium recommended).

The DBSM and DBSMD use the same accessories as the SMWB and SMDWB transmitters, specifically belt clips, pouches, and battery eliminators.

Key Features

• Encrypted with AES 256 bit CTR, offering four key policies
• RF Power selections at 10, 25 and 50 mW
• Ultra-lightweight, corrosion resistant housing
• OLED interface with lockout option
• Servo Bias input circuitry
• 2-way IR (infrared) port for fast setup
• Alternate use as recorder on internal microSDHC memory card at 48 kHz, 24 bits
• Timecode jam-sync capability with
• High density mode for ultra-tight channel spacing

Technical Specifications

Operating Frequencies
470.100 - 607.950
Channel Spacing
25 kHz
RF Power output
DBSM 2 (HDM only), 10, 25 or 50 mW
DBSMD 2 (HDM only), 10, 25 or 50 mW
Compatibility Modes
D2 digital with encryption, and HDM high density digital with encryption
Modulation Type
8 PSK
Encryption Type
AES-256 in CTR mode
Frequency stability
± 0.002%
Spurious radiation
Compliant with ETSI EN 300 422-1
Equivalent input noise
-125 dBV, A-weighted
Input level
If set for dynamic mic, 0.5 mV to 50 mV before limiting
Greater than 1 V with limiting
If set for electret lavaliere mic, 1.7 uA to 170 uA before limiting
Greater than 5000 uA (5 mA) with limiting
Line level input, 17 mV to 1.7 V before limiting
Greater than 50 V with limiting
Input impedance
Dynamic mic 300 Ohms
Electret lavaliere, Input is virtual ground with servo adjusted constant current bias
Line level
2.7 k ohms
Input limiter
Soft limiter, 30 dB range
Bias voltages
Fixed 5 V at up to 5 mA
Selectable 2 V or 4 V servo bias for any electret lavaliere
Gain control range
-7 to 44 dB; panel mounted membrane switches
Modulation indicators
Dual bicolor LEDs indicate modulation
-20, -10, 0, +10 dB referenced to full modulation
Controls
Control panel w/ LCD and 4 membrane switches
Low frequency roll-off
Adjustable from 20 to 150 Hz
Input Type
Analog mic/line level compatible; servo bias preamp for 2V and 4V lavaliere microphones
Input level
Dynamic mic 0.5 mV to 50 mV
Electret mic Nominal 2 mV to 300 mV
Line level 17 mV to 1.7 V
Input connector
TA5M 5-pin male
Frequency response
20Hz to 20kHz, +/- 1dB D2 Mode
20Hz to 16KHz, +/- 3dB High Density (HDM) Mode
Dynamic range
112 dB (A)
Distortion
< 0.035%
Antenna
Flexible, unbreakable steel cable.
Battery
AA (+1.5 VDC), disposable, Lithium Recommended
Weight w/ battery(s)
DBSM-A1B1 3.2 oz. (90.719 grams)
DBSMD-A1B1 4.8 oz. (136.078 grams)
Overall Dimensions
DBSM-A1B1 2.366 x 1.954 x 0.642 inches; (without microphone) 60.096 x 49.632 x 16.307 mm
DBSMD-A1B1 2.366 x 2.475 x 0.642 inches; 60.096 x 62.865 x 16.307 mm
Emission Designator
DBSM-A1B1/DBSMD-A1B1 170KG1E (D2 mode)
DBSM-A1B1/DBSMD-A1B1 110KG1E (HD mode)

Recorder
Storage media
microSDHC memory card
File format
.wav files (BWF)
A/D converter
24-bit
Sampling rate
48 kHz
Recording modes/Bit rate
HD mono mode 24 bit - 144 kbytes/s
Input Type
Analog mic/line level compatible; servo bias preamp for 2V and 4V lavaliere microphones
Input level
Dynamic mic 0.5 mV to 50 mV
Electret mic Nominal 2 mV to 300 mV
Line level 17 mV to 1.7 V
Input connector
TA5M 5-pin male
Frequency response
20Hz to 20kHz, +/- 1dB:
Dynamic range
112 dB (A)
Distortion
< 0.035%
Operating temperature range
Celsius -20 to 50
Fahrenheit -5 to 122
Included Accessories
1 - AA battery
1 - AMM-19 antenna
1 - AMM-22 antenna
1 - SMWBBCUPSL belt clip
1 - PSMWB pouch with swivel clip
1 - SMKITTA5 Connector kit with boot
1 - 55010 - 16 GB microSD card