Lectrosonics ALP700A User Manual
ALP700A
LPDA Antenna
TECHNICAL DATA
Feature Highlights
• SWR below 2.5:1 from 500 to 800 MHz
• 50 Ohm BNC connector
• 3/8” x 16 threaded stainless steel
mounting stud included
• Rods easily replaceable
• Repair kit available
• Optional mounting adapter kit
The ALP700A antenna is an LPDA (Log Periodic Dipole
Array) design that provides a useful directional pattern
over a broad frequency bandwidth. Most “gain antennas”
(those designs with a directional pattern) are limited in
bandwidth. This makes them awkward for use in multichannel wireless systems and with frequency agile
wireless systems.
The broad bandwidth of the ALP700A covers the entire
UHF band used for Lectrosonics wireless microphone and
IFB systems, yet still provides the directional pattern
needed to cover long distances.
The antenna is constructed of machined aluminum finished in electrostatic powder coat for lasting ruggedness.
Elements (rods) are user replaceable with simple tools.
The antenna is supplied with a stainless mounting stud
that adapts it to an optional adapter kit. The adapter kit
provides a variety of mounting options.
o
120
150
o
180
210
240
90
270
60
30
-20
-25
-15
-10
300
o
o
-5
10
50
0
330
UP
Typical Vertical Pattern
o
90
60
30
-20
-25
-5
-15
-10
o
10
50
0
330
180
120
150
o
210
240
270
300
o
Typical Horizontal Pattern
Orientation and Usage
The smaller rod elements of the antenna should
be pointed toward the matching transmitter for
maximum sensitivity (note the pattern plots on the
first page).
Since a wireless transmitter antenna is generally
oriented vertically, the rod elements on the
ALP700A should also be oriented vertically. Note
the “up” arrow engraved on the boom of the antenna.
The optional mounting adapters permit a wide
variety of orientations. It is important to locate the
antenna at least a foot or two (or more) away from
nearby surfaces. Reflections from nearby surfaces can alter the pattern and/or affect the
sensitivity of the antenna to certain frequencies in
particular locations.
The coaxial cable connected to the antenna should
be routed away from the antenna.
The antenna is terminated with a 50 Ohm BNC connector. The BNC
jack is connected to a coaxial line inside the boom opposite the jack.
A 3/8” - 16 threaded mounting stud is supplied to fit the adapters in the
optional mounting adapter kit. Two different threaded sockets are
available, positioned at 90 degrees from one another to allow horizontal or vertical mounting.
Optional Mounting Adapter Kit
Threaded adapter for standard
lighting clamps. 1/2” diameter
x 6 inch long. 3/8”-16 thread
on both ends.
Four piece kit model: ALPKIT
The mounting adapter kit allows mounting on photo and video
tripods, lighting equipment, and standard microphone stands.
The parts are constructed of stainless steel for lasting durability.
Microphone stand adapter,
1 1/2” long. 5/8”- 27 thread
on one end, with 3/8”-16
thread in other end. Knurled
finish.
1/4” - 20 threaded adapter.
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 end.
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