I’d like to thank Nathan and the team at Wendy’s Broadcadst for all their help. They have been supplying me with custom cables, made to the highest standard over many year. The low profile connectors are hard to find, yet they normally ship the finished leads the day after ordering, often to studios or locations where I am filming and I’ve never had to ask for any adjustments or corrections; They are right first time, despite my requiring some unusual bespoke wiring. I’ve also benefited from real world advice about products and fault finding. Wendy’s Broadcast have made location sound far less stressful.
DBU
DBu Wideband Digital Transmitter
The DBu Beltpack Transmitter is a wideband compact transmitter with switchable 25/50 mW power and 256-bit encryption. It's part of the D Squared digital wireless system.
The DBu is a second generation design with specially developed, high efficiency digital circuitry for extended operating time on two AA batteries. The transmitter can tune in coarse or fine steps across the UHF television band from 470.100 to 607.950 MHz, with a selectable output power of 25 or 50 mW. The pure digital architecture enables AES 256-CTR encryption for high level security applications.
Studio quality audio performance is assured by high quality components in the preamp, wide range input gain adjustment and DSP-controlled limiting. Input connections and settings are included for any lavalier microphone, dynamic microphones and line level inputs. Input gain is adjustable over a 44 dB range in 1 dB steps to allow an exact match to the input signal level, maximizing the dynamic range and signal to noise ratio.
The top panel contains the antenna jack, audio input level LEDs, the programmable function switch and the audio input jack. The LEDs provide red/green indications of the audio level from -20 dB to the onset of limiting to enable accurate input gain adjustment. The programmable switch can be configured as a mute switch, a power on/off switch, or be bypassed.
The housing is constructed of solid machined aluminum for lasting ruggedness. The exterior is finished with an ultra hard, black electroless nickel finish.
The transmitter is supplied with a stainless, spring wire belt clip that is secure, but easily detached and re-attached without tools. A spring-loaded belt clip is available as an option. The battery door is machined aluminum, hinged to the housing to prevent it being lost. The battery door latches securely to prevent being opened inadvertently, and will not pop open even if the unit is dropped.
Firmware updates are made via the USB port on the side panel of the housing. The procedure is very simple using a menu item on the transmitter and a standard micro USB cable.
Setup and adjustment is enabled through a backlit LCD, membrane switches, and an intuitive menu structure. Input gain is adjustable over a wide range in 1 dB steps to optimize modulation and limiting for maximum signal to noise ratio and minimum distortion.
Key Features
| Operating Frequencies | 470.100 - 607.950 MHz |
| Frequency Selection Steps | 25 kHz |
| RF Power output | Selectable; 25 or 50 mW |
| Frequency Stability | ± 0.002% |
| Digital Modulation | 8PSK |
| Equivalent input noise | –128 dBV |
| Input level | Nominal 2 mV to 300 mV, before limiting; Greater than 1V maximum, with limiting. |
| Input impedance (Mic) | 300 Ohm |
| Input impedance (Line) | 2k Ohm |
| Input limiter | Dual envelope type; 30 dB range |
| Gain control range | 44 dB in 1 dB steps; digital control |
| Modulation indicators | Dual bicolor LEDs indicate modulation of -20, -10, 0 and +10 dB referenced to full modulation; LCD bar graph |
| Audio Input Jack | Switchcraft 5-pin locking (TA5F) |
| Antenna | Galvanized steel, flexible wire |
| Battery | Two AA Duracell Quantum recommended |
| Battery Life | 5 hours; Duracell Quantum alkaline |
| Weight | 6.24 ounces (177 grams), including two AA batteries and wire belt clip |
| Dimensions | 3.2 x 2.5 x .74 in. (86 x 62 x 19 mm) |
| Emission Designator | 200KG1E |
Receive new product information, special offers and promotions
