It is not necessary for both antennas on a diversity receiver to be connected to identical lengths of cable ideally, each antenna should be connected to the minimum length of cable necessary to reach the receiver. The maximum length of cable is dictated by how much the antenna amplifier can boost the signal. These ratings are specific to the frequency range of the signal being passed (VHF or UHF). Different types of cable are rated according to the amount of signal loss over a specified length (usually 100 feet). An impedance mismatch causes some of the signal to be reflected back into the cable, resulting in a reduction of signal level.

For proper performance, the impedance of the cable should match the impedance of the antenna input on the receiver (50 Ohms for Shure receivers). For diversity wireless systems, both antennas must be located in the performance area, and connected to the receiver via separate coaxial cables. Wider separation between antennas does not offer significant benefit, except when mounting at opposite sides of a very large stage, for example. For best diversity performance, antennas should by placed from 1/2-wavelength to 1 full wavelength apart (1 to 2 feet for UHF). Antennas should also be kept away from sources of RF energy, such as computers, digital devices, AC power equipment, etc. Antennas should be mounted away from large metal objects or surfaces, which cause reflections that can reduce signal strength. A 1/4 wave antenna uses the receiver chassis as part of the antenna therefore a 1/4 wave antenna must not be remote mounted.įor good performance, the following guidelines should be observed when remote mounting antennas: The BLX4R, SLX-D and ULX Standard system comes with 1/4-wave antennas. The antenna supplied with Shure QLX-D, ULX-D, and Axient Digital wireless systems is a '1/2-wave', meaning that it is about 1/2 of the length of the radio wave being received. Antennas are described in terms of the signal wavelength they are designed to pick up.Click here for an online remote antenna tool.Remote Antennas for UHF Wireless Microphones

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