Sennheiser ew 100 Instructions for Use - Page 76

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. There are three transmitter versions: The hand-held transmitter is a complete radiomicrophone in a single unit, the plug-on transmitter converts your favourite dynamic wired microphone into a radiomicrophone, the pocket transmitter can accept a wide range of inputs including: omnidirectional or cardioid "tie" microphones, head-worn microphone, guitar/ instrument direct input and auxiliary devices via the optional CL 2 line input cable. Fresh batteries ensure good transmission power during operation. Always use alkaline batteries for best operation - a 9V PP3 battery has a much longer operating time than a NiCd rechargeable battery (approx. 8 hours with a 9V 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. Sennheiser miniature clip-on microphones can be attached in various ways: they can, for example, be attached to the hairline or to clothing (e.g. tie or lapel). However it is fixed, please make sure that the microphone is protected against sweat/moisture and make-up. 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 intermodulationfree. 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. 78