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Instruction manual
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ILA-1000
™
Unfortunately, it is still common practice to equip 100 V power amplifiers with the additional audio transformer.
Such systems are fundamentally wrong, since they have an unfavorable frequency behavior. Such a system
configuration increases the inductance with an increasing frequency, so that the high frequencies important
for speech intelligibility can no longer be radiated.
Induction loop amplifiers do not have this disadvantage. Therefore, by using dynamic processors and special
amplifier technology (constant current source), they are best suited for generating a constant field strength.
Monitoring
All important functions of the ILA induction loop amplifier are monitored.
This means that the ILA-1000 induction loop amplifier monitors its internal power output stage, the functio-
nality of the connected induction loop with a pilot tone pulse. If a monitored function fails, the yellow LED on
the front of the induction loop amplifier will not light up and the error contact „INFO LOOP OK“ [15VDC] will
be de-energized.
Compatibility according to EN 60118-4:
The ILA-1000 induction loop amplifier has been designed to be compliant with the EN 60118-4 standard, so
that a loop construction according to a „LOOP SEGMENT“ system is made possible.
In a „LOOP SEGMENT“ system, two ILA-1000s always work together to form a magnetic field. As a result, a
uniform field strength of the magnetic field is always achieved over the entire area.
The magnetic field outside the intended range loses strength rather quickly and drops to zero. This is done by
coupling a phase shifter FS-1, which is connected between the two ILA-1000, which in turn generates a signal
phase difference of 90 degrees in the electrical flow through two adjacent induction loops.
Further notes on loop laying with the use of a phase shifter FS-1 are described in detail in the following chap-
ters.
GENERAL INFORMATION