Sennheiser EK 300 IEM Instruction Manual download pdf (Page 24)

9 Overview

Wireless transmission systems

With the evolution wireless series, Sennheiser puts an end to cable tangles

and enables complete freedom of movement at an affordable price.

The systems operate exclusively in the UHF band. UHF transmission is

extremely reliable and is far less prone to interference than the overcrowded

VHF band – harmonics from mains units, fluorescent tubes, refrigerators,

computers, etc. are virtually eliminated. Also indoor propagation of UHF

radio waves is better than VHF so that the RF power can be kept low – this

is also an advantage when using multi-channel systems. Finally, UHF

frequency ranges are being approved all over the world for radiomicrophone

usage – in some countries licence-free.

Fresh batteries ensure good reception during operation. Always use alkaline

batteries for best operation – a 9 V PP3 battery has a much longer operating

time than a NiCd rechargeable battery (approx. 4 to 6 hours with a 9 V PP3

or 1 hour with a rechargeable).

Correct adjustment of transmitter sensitivity is vital. Too high and you get

overmodulation and distortion, too low and you get undermodulation and a

noisy signal. Please set the sensitivity correctly for the microphone/usage

and check it before every performance to ensure best operation.

Interference such as distortion, hissing or “birdying” may occur if several

transmitters are used together and the frequencies have not been correctly

chosen. Sennheiser standard frequencies (as supplied) are all intermodulation-

free. For other frequency sets please contact your local Sennheiser agent,

who will be able to provide you with information on correct frequency choice

and/or be able to calculate special frequency sets for you.

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Sennheiser EK 300 IEM Instruction Manual Page 24