Lectrosonics ALP690 Active Log Periodic Antenna

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The Lectrosonics ALP690 is a high performance LPDA (log periodic dipole array) antenna with a built-in RF amplifier for use with wireless microphone receivers or base station transmitters in location or studio productions. The design delivers +4 dBd of gain in a directional pattern to extend operating range, and the RF amplifier can be engaged to supply gain for overcoming signal loss in long coaxial cable runs.

The antenna is formed with copper traces on a .133" thick glass epoxy high-pressure thermoset plastic laminate material with a durable finish. The skeletal structure reduces wind loading in outdoor use. The antenna is powered by DC bias inserted on the coaxial cable connected to the 50 ohm BNC jack. This power can be supplied by a Venue Series receiver, an active multicoupler or an inline BIAS-T. When no bias is applied, the ALP690 automatically switches via relays to function as a passive antenna. This way, it can be used not only for receivers but for IFB or IEM transmission applications as well.

When used as an active antenna, the filter bandwidth is adjustable from 470 MHz at the lower end to either 608 or 700 MHz at the top end, to serve users' needs in various markets and locations. Vertical orientation provides a wide horizontal coverage pattern. RF gain, bandwidth and display brightness are adjusted with a membrane switch keypad and LED display on the control panel. RF gain is adjustable to match the length of cable in use.

The ALP690's pickup pattern provides gain toward the shortest elements to increase sensitivity in that direction (the front) to extend operating range, and reduced sensitivity to signals arriving above, below and behind the antenna.

Lectrosonics ALP690 - Features:

• Broad bandwidth for multi-channel systems
• Directional pattern with 4 dBd RF gainBuilt-in RF amplifier with adjustable gain for offsetting cable loss
• Keypad and membrane switches with LED readout for quick setup
• Automatically switches to passive mode when no DC power is present on the coaxial cable
• Durable ἀnish and weather tolerant construction for indoor/outdoor use
• Skeletal structure reduces wind loading
• Versatile mounting options with the supplied mount and optional mounting adapter kit

• Pattern Gain:
  • +7 dBi (isotropic)
  • +4 dBd (over dipole)
• Passband:
  • Passive: 450 - 850 MHz
  • Active: 470 - 608 or 470 - 700 MHz, selectable
• RF Amplifier Gain Range: -6 to +12 dB in 1 dB steps
• Power Requirements: DC bias on center pin of coaxial cable; 8V to 16V DC; 1.5 W max.; polarity protected
• Third Order Intercept: +27 dBm @ input; +41 dBm output
• Weight: 13 oz | 355 g