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ALP690
Active Log Periodic Antenna
• Selectable RF filtering 470-608 MHz or 470700 MHz
• Directional pattern with 4 dBd RF gain
• Built-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 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
The ALP690 is a high-performance LPDA (log periodic
dipole array) antenna with a bypassable, built-in RF
amplifier for use with wireless microphone receivers in
location or studio production. The design delivers +4
dBd of passive gain in a directional pattern to extend
operating range, and, when DC power is applied, the
amplifier applies gain to overcome loss in long coaxial
cable runs. By offering both active and passive operation modes, the ALP690 can be used as a receiver antenna (active or passive) and as a transmitter antenna
(passive only).
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 power
is applied, the antenna automatically switches to passive operation. When used in active mode, RF filtering
can be selected between 470-608 MHz or 470-700
MHz for operation in different regions.
TECHNICAL DATA
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
bandwidth is adjustable to serve users’
needs in various
locations.
Vertical orientation provides a wide
horizontal coverage
pattern.
Power is provided by DC bias
on the output connector
Rio Rancho, NM, USA
www.lectrosonics.com
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The 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.
The optional ALPKIT stainless steel mounting kit
works with the supplied mounting block for versatile
combinations to position the antenna.
Microphone stand adapter, 1
1/2” long. 5/8”- 27 thread on one
end, with 3/8”-16 thread in other
end. Knurled finish.
(PART # 26313)
Threaded adapter
for standard lighting
clamps. 1/2” diameter
x 6 inch long. 3/8”-16
thread - both ends.
(PART # 26311)
Side view - Vertical pattern
Threaded adapter for
photo/video tripod
mounting. 1/2” diameter
x 1 3/4” long. 3/8”-16
thread on one end, 1/4”-
20 on the other.
1/4” - 20 threaded adapter
(PART # 28770)
(PART # 26312)
The mounting block
provides 3 threaded
sockets for 1/4-20
tripods, 3/8-16 tripods
and 5/8-27 microphone stands. The
mounting block can
be rotated 90 degrees for horizontal or
vertical positioning.
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
Power Requirements: DC bias on center pin of coaxial cable;
8V to 16V DC; 1.5 W max.; polarity protected
Top view - horizontal pattern
581 Laser Road NE • Rio Rancho, NM 87124 USA • www.lectrosonics.com
(505) 892-4501 • (800) 821-1121 • fax (505) 892-6243 • sales@lectrosonics.co
26 March 2019