Lectrosonics ALP690 Users Manual
INSTRUCTION MANUAL
ALP690
Active LPDA Antenna
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Serial Number:
Purchase Date:
Rio Rancho, NM, USA
www.lectrosonics.com
ALP690
Features and Functions
The ALP690 is a high performance LPDA (log periodic
dipole array) antenna with a built-in RF amplifier for
use with wireless microphone receivers on location or
studio production. The antenna design delivers +4 dBd
of passive gain in a directional pattern to extend operating range and suppress signals from the rear.
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.
RF gain, bandwidth and display brightness are adjusted with a membrane switch keypad and LED display
on the control panel.
Active gain can be adjusted from +12dB to -6dB. Positive gain is used to compensate for long coaxial cable
runs between the antenna and a receiver or multicoupler. Negative gain can be used to offset the natural
pattern gain of +4dBd to achieve a level equivalent to a
dipole antenna, or in special cases where high power
transmitters are being used in close proximity.
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.
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.
Settings are made with a
keypad interface on the
control panel.
Power is provided by DC bias
on the output connector
The antenna will automatically switch to the passive
mode when no DC bias power is present on the BNC
connection.
LECTROSONICS, INC.2
Active LPDA Antenna
Reception Pattern
Vertical orientation provides a wide horizontal coverage pattern and deep nulls directly above and below
the antenna. Viewed from the side, the pattern is
weighted forward with significant rejection at the rear.
Viewed from above, the horizontal coverage pattern
extends across a broad angle.
FCC Notice
NOTE: This equipment has been tested and found to comply with the limits for a Class
B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. The
equipment generates, uses and can radiate radio frequency energy and, if not installed
and used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna
• Increase the separation between the equipment and receiver
• Connect the equipment into an outlet on a circuit different from that which the
receiver is connected
• Consult the dealer or an experienced radio/TV technician for help
Changes or modifications to this equipment not expressly approved by Lectrosonics, Inc.
could void the user’s authority to operate it.
Rio Rancho, NM 3
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