Lectrosonics ALP690 Active Log Periodic Dipole Array Antenna

Lectrosonics' ALP690 is a high-performance LPDA (log periodic dipole array) antenna that comes with a bypassable, onboard RF amplifier that's ideal for use with wireless microphone receivers either for on-location or in-studio production. It's designed to provide +4 dBd of passive gain in a directional coverage pattern which extends operating range, and when DC power is used, the amplifier applies gain to overcome the loss that can be experienced with long coaxial cable runs. By offering both active as well as passive operation modes, this unit can be used as both a receiver antenna (active or passive) and transmitter antenna (passive only).

It's made with copper traces on a 0.133" thick glass epoxy high-pressure thermoset plastic laminate material with a durable finish. The obvious skeletal-type structure reduces wind loading when used outdoors.

It's powered via inserted DC bias on the coaxial cable connected to the 50-ohm BNC jack. The power can be supplied by either a Venue Series receiver, an active multicoupler or an inline BIAS-T. With no power applied, the antenna is automatically switched to passive operation. When used in active mode, its RF filtering is selectable between 470-608 MHz or 470-700 MHz for operation in different regions.

Features

• Selectable RF filtering 470-608 MHz or 470-700 MHz
• Directional pattern with 4 dBd RF gain
• Onboard 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 finish 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

Specifications

• 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
• Third Order Intercept: +27 dBm @ input; +41 dBm output
• Weight: 13 ozs.; 355 grams
• Dimensions: 27 x 33 x 4 cm (11 x 13 x 1.5 in)
• Temperature Range: -20° - +45° C ( 4° - 113° F)
• Power Requirements:
  • DC bias on center pin of coaxial cable;
  • 8V to 16V DC; 1.5 W max.; polarity protected