Lectrosonics ALP650H Specifications
ALP Series
TECHNICAL DATA
LPDA Antennas
ALP500 ALP620 ALP650 Series
Economical design ideal for
fixed applications
Skeletal design for decreased
wind loading
Onboard amplifier ideal for
long cable runs, phantom
powered from Venue,
UMC16 or Bias T
The ALP Series antennas are a Log Periodic Dipole
Array (LPDA) design that provides a useful directional
pattern over a broad frequency bandwidth. Many “gain
antennas” (those designs with a directional pattern) are
limited in bandwidth, making them awkward for use in
multi-channel wireless systems and with frequency agile
wireless systems. With VSWR below 2:1 from 450 to 862
MHz, the broad bandwidth of the ALP Series covers a
broad section of the band used for Lectrosonics wireless
microphone and IFB systems, yet still provides the directional pattern needed to cover long distances.
All ALP Series antennas are constructed of 1/8” FR4
fiberglass circuit board material and are extremely rugged. The ALP620 and ALP650 Series antennas include
a protective cover over the BNC connector, making them
suited for field production, while the more economical ALP500 is better suited for indoor installation. The
perforated body of the ALP620 makes it resistant to wind
loading outdoors. The ALP650 models are “receive only”
models, featuring a built-in amplier with adjustable gain
for use with long coaxial cable runs and/or RF splitters.
The antennas can be mounted horizontally or vertically
by removing four screws and repositioning the mount-
ing block. This helps to position the antenna away from
nearby reective surfaces to preserve more of the natu-
ral pattern of the LPDA design.
Versatile Mounting Block
The mounting block on all ALP Series antennas can
accept three common sizes of threads:
• 1/4”-20 (tripod
mount)
• 3/8”-16 (pro
tripod mount)
• 5/8”-27 (mic
stand)
A 3/8”-16 stud (Part
#28769) is included
with all ALP Series
antennas.
The mounting
block can be
rotated to allow
horizontal
or vertical
mounting
Rio Rancho, NM, USA
www.lectrosonics.com
ALP650
Powering the ALP650
DC power is supplied to the
amplifier through the connected
coaxial cable from a BIAS T,
UMC16B or VENUE receiver.
DC POWER TO ALP650
RF OUT
ALP650
The BIAS T connects external
DC power to the antenna, blocks
the DC from its output to pre-
vent it from entering the receiver
antenna ports and passes the
RF output of the antenna to the
receiver.
9 to 16 VDC
RF OUT
BIAS T
ANT AANT B
Antenna Power Jumpers
VENUE RECEIVER
The VENUE receiver also includes
a DC power pass-through to operate
the ALP650 antenna amplier. Jump-
ers on the circuit board enable and
disable the DC power.
NOTE: The three examples shown above are
mutually exclusive. Only one of them should be
used in each installation.
OR
BIAS T
RF OUT
9 to 16 VDC
ANT A
Antenna Power Jumpers
ANT B
UMC16B MULTICOUPLER
The UMC16B multicoupler passes DC
power from its supply to the antenna
input ports to power the ALP650
through the coaxial cable. Jumpers on
the circuit board enable or disable the
DC power.
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