Electro-Voice LPA500 User Manual
R
R
LPA500 UHF Log Periodic Antenna
Owner’s Manual
Description
The Electro-Voice LPA500 is a broadband di
rectional log periodic antenna. It is optimized for
reception of frequencies from 450 to 900 MHz.
The gain of this antenna enables it to receive
signals from a greater distance than a typical
“whip” type antenna.
SPECIFICATIONS
(Typical)
Gain..................................................................................................................................4.6 dBd
1/2 Power Beam Width ........................................................................................................120°
Front-to-Back Ratio ..........................................................................................................19.4dB
SWR.......................................................................................................................................1.5:1
Input Impedance ................................................................................................................50 ohm
Input Connector ....................................................................................................................TNC
Log periodic antennas are very directional and
will have the best reception when pointed at the
transmitter. This design also means less interfer
ence from unwanted signals coming from the
back or side of the antenna.
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Placement
The LPA500 should be placed in a position that
has a clear, unobstructed path to the transmitter.
Obstructions to the signal such as walls, ceilings
and metal objects will reduce range and perfor
mance.
Generally speaking, placing the LPA500 at an
elevated location will yield the best performance
over the largest area.
Antenna Mounting
The LPA500 is supplied with a variety of
mounting hardware to make installation easy. It
should always be mounted vertically with the
arrow pointing towards the transmitters(s). See
Figure 1. when oriented correctly, the LPA500
will appear as a thin piece of metal when
viewed from the transmitter’s position.
For best results, do not clamp the LPA500 to
horizontal metal objects that extend past the
clamp (see Figure 5). Metal rods or other objects
that block part of the large face of the antenna
will detune it and cause loss of performance.
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MOUNT
VERTICALLY
END VIEW
Figure 1
Antenna Mounting
-1-
Microphone Stand Adapter
Attach the microphone stand adapter using the
screws and spacers supplied with it. See Figure 2.
LPA500
SPACERS
SCREW
ALTERNATE
LOCATION FOR
MIC BOOM
FRONT VIEW
Figure 2
Microphone Stand Adapter
Angle Bracket
Attach the angle bracket using the nuts,
lockwashers, and screws supplied with it. Self
tapping screws are supplied for securing the
bracket to wood, metal, or other surfaces. See
Figure 3.
LPA500
NUT
SIDE VIEW
TAPPING SCREW
LOCKWASHER
SLOTTED SCREW
ANGLE BRACKET
Figure 3
Angle Bracket
-2-
Clamps
Clamps are provided for mounting the LPA500 on
pipes, scaffolds, tree limbs, etc.. Attach the
clamps with the hardware supplied. See Figure 4.
LPA500
BOLT
LOCKWASHER
NOTE OFFSET
IN CLAMPS
WING NUT
Figure 4
Clamps
Do not clamp the antenna to horizontal metal
objects that extend past the clamp. See Figure
5. This will detune the antenna and cause loss
of range and performance.
LPA500
R
THIS END TOWARD TRANSMITTER
UHF
LOG PERIODIC ANTENNA
GOOD
BAD
Figure 5
Clamp Mounting
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