Overview:

The DBSM-A1B1 digital transcorders was developed specifically for the needs of the film industry and offer time code jam sync capability. It 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 transmitter also offers 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 LCD, 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 housing is machined from solid aluminum blocks to provide an extremely lightweight and rugged package. A
special non-corrosive finish resists salt water exposure and perspiration in extreme environments.

Frequency Tuning Range
RF-intense multichannel and mobile venues must have a broad selection of frequencies available to alleviate interference problems, especially with the emergence of DTV telecasts. Frequencies are selectable in 25 kHz steps
across the broad tuning range of each frequency band.

Alternate Recording Function
Instead of transmitting, the transmitter may also be used as a stand alone recorder. The industry standard
.wav (BWF) file format is compatible with essentially any audio or video editing software.

Features:

• Selectable output power to maximize operating range or battery life
• Ultra-lightweight, corrosion resistant housing
• OLED interface with lockout option
• Servo Bias input circuitry
• IR (infrared) port for fast setup
• Alternate use as recorder on internal microSDHC memory card
• Timecode jam-sync capability with TCXO for <1 ppm accuracy
• High density mode for ultra-tight channel spacing

Specs:

Operating frequencies	Band A1-B1, 470.100 - 607.950
Channel Spacing	25 kHz
RF Power output	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
Frequency stability	± 0.002%
Spurious radiation	Compliant with ETSI EN 300 422-1
Equivalent input noise	–125 dBV, A-weighted
Input level
Set for dynamic mic	0.5 mV to 50 mV before limiting, Greater than 1 V with limiting
Set for electret lavalier 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 lavalier	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 lavalier
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 lavalier 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
Audio Performance
Frequency response	20Hz to 20kHz, +/- 1dB (Encrypted Digital Mode); 20Hz to 11.3KHz, +/- 3dB (High Density (HD) Mode (CH))
Dynamic range	110 dB (A), before limiting
Distortion	< 0.035%
Antenna	Flexible, unbreakable steel cable.
Battery	AA (+1.5 VDC), disposable, Lithium recommended
Battery Life with AA
Lithium	8:55 (2 mW), 7:25 (10 mW), 9:35 (25 mW), 4:45 (50 mW)
Alkaline	2:15 (2 mW), 2:00 (10 mW), 1:25 (25 mW), 1:10 (50 mW)
NiMH	5:25 (2 mW), 4:55 (10 mW), 4:25 (25 mW), 4:20 (50 mW)
Weight with battery	3.2 oz. (90.719 grams)
Overall Dimensions	2.366 x 1.954 x 0.642 inches (without microphone) 60.096 x 49.632 x 16.307 mm
Emission Designator	170KG1E
Recorder
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