Sennheiser EM 550 G2 - 02-06 Specifications download pdf (Page 31)

Diversity reception

The two receivers of the EM 550 G2 operate 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.

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

Electronic

switch-over of

AF signal

Receiver section II

Control signal

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Sennheiser EM 550 G2 - 02-06 Specifications Page 31