Sennheiser EW100 G2 - Manual (Page 41)

41
Diversity reception
The EM 100 G2 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.
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 recei-
vers.
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 sig-
nal 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 none-
xistant.
The receiver display panel shows the active diversity section (I or II)
ቭ
.
ቭ
Receiver section I
Electronic
switch-over of
AF signal Receiver section II
Control signal Control signal