Lectrosonics DBu Digital Encrypted Beltpack Transmitter
The DBu transmitter is a 4thgeneration design with specially developed, high-efficiency digital circuitryfor extended operating time on two AA batteries. The transmitter can tune incoarse or fine steps across the UHF television band from 470 to 608 MHz(470-614 MHz for export versions), with a selectable output power of 25 or 50mW. The pure digital architecture enables AES 256-CTR encryption for high-levelsecurity applications.
The top panel contains the antennajack, audio input level LEDs, the programmable function switch and the audioinput jack. The LEDs provide red/green indications of the audio level from -20dB to the onset of limiting to enable accurate input gain adjustment. Theprogrammable switch can be configured as a mute switch, a power on/off switch,talkback, or be bypassed.
Studio quality audio performanceis assured by high quality components in the preamp, wide range input gainadjustment and DSP-controlled limiting. Input connections and settings areincluded for any lavaliere microphone, dynamic microphones and line levelinputs. Input gain is adjustable over a 44 dB range in 1 dB steps to allow anexact match to the input signal level, maximizing the dynamic range and signalto noise ratio.
Key Features
- 24 bit/48 kHz digital conversion
- Tunes across entire UHF frequency range
- 256-bit encryption – AES 256-CTR
- Selectable RF power at 25 and 50 mW
- USB port for firmware updates
- Wide range input gain adjustment
- DSP-controlled input limiter
- Two AA battery power
- Solid machined aluminum housing
Technical Specifications
Operating temp. range
Celsius -20° – 50°; Farenheit -5°- 122°
Frequency Selection Steps
25 kHz
Audio Frequency Response
20 Hz – 20 kHz +- 3dB
RF Power output
Selectable; 10, 25 or 50 mW
Frequency Stability
± 0.002%
Digital Modulation
8PSK
Equivalent input noise
-128 dBV
Input level
Nominal 2 mV to 300 mV, beforelimiting
Greater than 1V maximum, withlimiting.
Input impedance
Mic 300 Ohm
Line 2k Ohm
Input limiter
Dual envelope type; 30 dB range
Gain control range
44 dB in 1 dB steps; digitalcontrol
Modulation indicators
Dual bicolor LEDs indicatemodulation of -20, -10, 0 and +10 dB referenced to full modulation
LCD bar graph
Controls
Top panel toggle switch;programmable as power, mute or none (off) function
Side panel membrane switches withLCD 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 Duracell Ultra recommended
Battery Life
5 hours; Duracell Ultra alkaline
Weight
6.24 ounces (177 grams), includingtwo AA batteries and wire belt clip
Dimensions
3.2 x 2.5 x .74 in. (86 x 62 x 19mm)
Emission Designator
200KG1E
Included Accessories
1 – AMM-19 straight antenna – SMAmount
1 – AMM-22 straight antenna – SMAmount
2 – AA Batteries
1 -26895 wire belt clip
