User's Manual

TD 92082GB
PRELIMINARY
7 May 2012 / Ver. PB7
Installation Guide
LF Location Units
1
1 Introduction
Figure 1. L951LP Locator, L951A1 Antenna Unit and L951A2 Antenna Unit.
The Locator L951LP is a dual output low frequency (LF) inductive location transmi
tter. It is
used in the Ascom Paging System and Ascom IP-DECT System, when location function is
required. It generates coded signals to modulate a magnetic field carrier. Alarm Transmitters
designed for LF can be used to identify the location from where an alarm is generated.
L951LP has two antenna channels. Either the internal antenna and one external Antenna
Unit (L951A1, L951A2, L951A2/
2, indoor or outdoor loops) or two external Antenna Units
can be used for transmission. The Antenna Units connected to L951LP can either cover a
larger or additional area with the same code, or different areas with code and code + 1.
When L951LP i
s used to drive outdoor loops, the L951TP (Transient Protection) must be
mounted for protection against lightning strikes.
L951PA Power Amplifier is used when the transmitting range compared to L951LP has to
be extended. The Power Am
plifier is connected to the Locator unit and can feed one
Antenna Unit (L951A1, L951A2, or L951A2/2). The Power Amplifier does not have any
internal antenna.
The following procedure describes the installation of L951LP Locator
, Antenna Units
(L951A1, L951A2, L951A2/2), L951PA Power Amplifier, and L951TP Transient Protection
Unit.
As a complement to this Installation Guide, see the S
ystem Installation document.
Unit Supply voltage Power consumption
L951LP 15–28 V AC or 16–40 V DC 3 W
L951A1 none (passive)
L951A2 none (passive)
L951A2/2 none (passive)
L951PA 15–28 V AC or 16–40 V DC 5.7 W
L951TP none (passive)
IMPORTANT: Protect the unit against current exceding 20 A. Use power cables with 
cross-section 3 mm
2
.