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receiver 1 | electronic switching | receiver 2 |
| from one signal to another |
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4 Diversity reception
The EM 3532 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 antennæ and two receiver sections. The antennæ 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 antennæ at the same time is virtually nonexistant.
The display panel of the receiver always shows whether the diversity channel switched is channel A or channel B.
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