Sennheiser EM 300 Instruction Manual download pdf (Page 36)

elektronische Umschaltung

des NF-Signales

Empfänger 2Empfänger 1

Steuersignal

Diversity reception

The EM 100 receiver operates on the “true diversity” principle:

A receiving antenna receives not only the electromagnetic waves which reach

it by a direct path, but also the reflections of these waves which are created in

the room by walls, windows, ceilings and fittings. When these waves are

superimposed, destructive interference occurs, which can also be called “field

strength gaps”. Repositioning the receiving antenna can bring a solution,

provided the transmitter remains in its original position. With mobile

transmitters, however (which all radiomicrophones are ), the “field strength

gap” will then occur with a different transmitter position. These “field strength

gaps” can only be eliminated with true diversity receivers.

In true diversity, instead of one antenna and one receiver there are now two

antennas and two receiver sections. The antennas are spatially separated. By

means of a comparison circuit, the receiver section with the strongest RF

signal is always switched to the common AF output. The risk of the occurrence

of “field strength gaps” in both antennas at the same time is virtually

nonexistant.

The receiver display panel shows the active diversity section (I or II).

Receiver section I Receiver section II

Electronic

switch-over of

AF signal

Control signal Control signal

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Sennheiser EM 300 Instruction Manual Page 36