Lectrosonics DBSM-A1B1, DIGITAL TX W/RECORDER, TIME CODE, SINGLE AA, 470-608 MHz

Lectrosonics DBSM-A1B1, DIGITAL TX W/RECORDER, TIME CODE, SINGLE AA, 470-608 MHz

The DBSM and DBSMD digital transmitters were specifically developed to meet the requirements of the film industry, providing reliable performance and convenient features for professional production environments. Both models include timecode jam synchronization, allowing them to be easily synchronized with other equipment used during production. They also support hands-free setup and adjustment through audible tones, making it possible to configure the transmitters without having to physically access the controls. A sleep mode is available to conserve battery power during setup, which is particularly useful when the transmitters are placed or hidden inside costumes. Once production begins, the transmitters can be awakened and returned to normal operation. The DBSM and DBSMD offer precise input gain adjustment in 1 dB increments across a 44 dB range. This provides detailed control over the audio input level to achieve the desired recording performance. They also feature an adjustable low-frequency audio roll-off with selectable 3 dB down points at 20, 35, 50, 70, 100, 120, and 150 Hz. This feature helps control subsonic frequencies and other very low-frequency audio content that may cause unwanted noise or affect the quality of the recorded signal.

The transmitters provide three selectable RF output power levels: 10, 25, and 50 mW. For situations where multiple transmitters need to operate within a limited frequency range, the DBSM and DBSMD include a special high-density mode (HDM). This mode operates at 2 mW and allows for very close channel spacing while reducing the need for extensive frequency coordination. The input section incorporates Lectrosonics’ servo-bias input circuitry and uses a standard TA5M connector. This versatile input can accommodate a range of audio sources, including electret lavalier microphones, dynamic microphones, and line-level signals. To protect the audio circuitry from excessive input levels, a DSP-controlled analog audio limiter is positioned before the first microphone preamp. The limiter provides more than 30 dB of overload protection and uses a dual-release design. This allows it to handle both short, sudden transients and longer-duration peaks while maintaining low distortion and preserving natural-sounding audio.

For convenient operation, the transmitters are equipped with a water-resistant control panel featuring an OLED display, membrane switches, and multi-color LEDs. These controls allow users to quickly and accurately adjust the input gain, select operating frequencies, and choose the appropriate compatibility mode. The battery compartment is designed to accept standard AA batteries, with lithium batteries recommended for reliable and extended operation. The DBSM and DBSMD are also compatible with the same accessories used with the SMWB and SMDWB transmitters. These accessories include belt clips, pouches, and battery eliminators, allowing users to easily integrate the DBSM and DBSMD into existing equipment and production setups.

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 <1ppm accuracy
• High density mode for ultra-tight channel spacing
• Simultaneous record and transmit feature for models sold outside the USA.

Operating frequencies:

DBSM(D)-A1B1: Band A1-B1: 470.100 - 607.950
DBSM(D)/E01-A1B1: Band A1-B1: 470.100 - 614.375
DBSM(D)/E01-B1C1: Band B1-C1: 537.600 - 691.175
DBSM(D)/E09-A1B1 Band A1-B1: 470.100 - 614-375
NOTE: It’s the user’s responsibility to select the
approved frequencies for the region where the
transmitter is operating
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
DBSM(D)/E01-A1B1: 2 (HDM only), 10, 25 or 50 mW
DBSMD(D)/E01-B1C1: 2 (HDM only),10, 25 or 50mW
DBSM/E09-A1B1: 2 (HDM only), 10, 25 mW
DBSMD/E09-A1B1: 2 (HDM only), 10, 25 mW
Compatibility Modes: DBSM/DBSMD: 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
Audio Performance
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
Audio Performance
Frequency response: 20Hz to 20kHz, +/- 1dB:

Dynamic range: 112 dB (A)
Distortion: < 0.035%
Operating temperature range
Celsius: -20 to 40
Fahrenheit: -5 to 104