Audio RMS 2020, User Manual

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Diversity reception
When electromagnetic waves are radiated by a moving
transmitter, the receiver picks up reflected signals from
surrounding structures as well as the directly radiated
signal. These reflected signals combine with the direct
signal, and in the case where the combining signals are
out of phase with each other, a drop-out or loss of signal
results.
To eliminate this cancellation effect Audio Limited
employ the true diversity technique in the DX 2020
receiver.
The DX 2020 receiver incorporates two separate
receivers fed by separate antennae. A comparator
circuit compares the RF levels from the two receivers
ensuring that the receiver will always switch to the
strongest signal. A noiseless switching circuit takes full
advantage of the accurate level detection to allow
switching as often as needed without noise or clicks.
The result is a reliable, dropout free, broadcast-quality
audio signal indistinguishable from a line microphone.
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Selecting frequencies
The RMS 2020 System provides a choice of 32 operating
frequencies, in two banks in the UHF 470MHz to
1000MHz range. This gives the flexibility of allowing
several sets of receivers and transmitters to be
operated in the same area without interference.
Introduction