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Overcoming signal loss

Overcoming signal loss

Overcoming signal loss

The ALP690 antenna is powered by a DC bias inserted on the coaxial cable connected to the 50Ω BNC jack

The ALP690 from Lectrosonics has been developed for use with wireless microphone receivers or base station transmitters in location and studio production. It is a UHF LPDA (log periodic dipole array) antenna with a built-in RF amplifier and delivers +4dBd of passive gain in a directional pattern to extend the operating range. An RF amplifier can be used to supply gain for overcoming signal loss in long coaxial cable runs.

The ALP690 antenna is powered by a DC bias inserted on the coaxial cable connected to the 50Ω BNC jack. A Venue Series receiver, an active multicoupler or an inline BIAS-T can supply the power. When no bias is applied, the ALP690 automatically switches via relays to function as a passive antenna. RF amplifier gain, filter bandwidth and display brightness are adjusted with a membrane switch keypad and LED display on the control panel. Depending on the type and length of the coax cable, RF gain is adjustable in 1dB steps from –6dB to +12dB to match the RF. Vertical orientation provides a wide horizontal coverage pattern.


In other news, the manufacturer has also unveiled the DCHT portable digital stereo transmitter for use in film and TV production as both a wireless audio link from a bag or cart system to cameras, or as a portable IFB transmitter paired with the Duet digital wireless M2R receiver packs. The DCHT accepts two channels of mic or line level analogue signals or an AES digital signal from a mixer, and transmits to the receiver or receivers in a pure digital format.

The DCHT can tune across the available UHF TV band from 470.100–607.950MHz (470.100–614.375MHz for the export version) in 100kHz or 25kHz steps, offering more than 6,000 frequencies. The RF output can be set to 10mW, 25mW or 50mW to provide a flexible operating range. Input connections and settings are included for lavalier microphones, dynamic microphones and line level inputs. Input gain is adjustable over a 51dB range in 1dB steps to maximise the dynamic range and signal-to-noise ratio.

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