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They are typically available in both wideband and narrowband varieties. Wideband refers to a device that will pass frequencies over a large range, typically several hundred Megahertz. Narrowband devices may be limited to no more than 20 or 30 MHz.
Since these are active devices, frequencies outside the bandwidth of the distribution system will not pass on to the receivers. Antennas can be placed outside of the rack on microphone stands, wall brackets, or any other suitable mounting device. They do not require the ground plane supplied by the receiver. Directional antennas are obviously designed to be remote-mounted as well.
Because of RF loss issues in coaxial cables, it is important to use the proper low loss coaxial cable. Using 75 ohm cable results in additional loss due to the impedance mismatch, but this may not be fatal to the installation, since this loss is typically less than 1 db.
Cable specifications from any manufacturer should list a cable's attenuation loss at various frequencies in db 9 Coaxial antenna cable loss at VHF and UHF frequencies Antenna amplifiers per ft 30 m.
Use this value to calculate the expected loss at the receiver for the desired cable run. A loss of between 3 and 5 db of signal strength is considered acceptable.
If the cable run results in a loss of greater than 5 db, active antenna amplifiers must be used to compensate in order to avoid poor RF performance. These active amplifiers may provide a selectable amount of gain.
Power for these amplifiers is drawn from the receiver's antenna inputs or the antenna distribution system. Note: Not all wireless microphone receivers have this voltage present. Please consult the specifications ahead of time. The appropriate gain setting is determined by the loss in the cable run. The amplifier is placed at the antenna, and can usually be wall-mounted or stand-mounted.
In extreme cases, two amplifiers can sometimes be connected inline to achieve longer lengths. Make certain the receiver or antenna distribution system can supply enough current to power multiple antenna Remote antenna amplifier amplifiers.
Finally, as with active distribution systems, realize that antenna amplifiers are also band-specific, available as both narrow or wideband. Each connection between two sections of cable may result in some additional signal loss, depending on the connector.
To increase reliability, use one continuous length of cable to go from the antenna to the receiver. If antenna amplifiers are being used, mount the antenna directly on the input of the first amplifier, use one length of cable to go from the amplifier to the second antenna amplifier if needed , and from the second antenna amplifier to the receiver. Hint: Do not over-amplify the radio signal! More is certainly not better in this case. Excess amplification can overload the front-end of the receiver, causing drop-outs and RF bleed one transmitter showing up on several receivers on an antenna distribution system.
Try to use only the amount of gain necessary to compensate for loss in the cable. Net gain should be less than 10 db. Use the proper low loss cable for the installation. Use the required antenna amplifiers to compensate for cable loss.
With wireless microphone systems, multiple antennas can be combined together to feed a single receiver or multiple receivers with antenna distribution to provide coverage across multiple rooms or in extremely large spaces. For wireless personal monitor systems, which usually consist of rack-mounted transmitters, antenna combining is used to reduce the number of transmitting antennas, i. Multi-room Antenna Setups For multiple room coverage, use passive combiners.
Since they do not require power and are typically compact, they can be located wherever necessary. A passive combiner will typically result in at least 3 db of loss, so be sure to include this figure when calculating cable loss. Multiple combiners can be used in series, if more than two locations need to be covered, so long as enough amplification is provided to make up for whatever additional losses are incurred.
For situations where more antenna amplifiers are needed than can be effectively powered by the receiver or antenna distribution system, additional bias Tee power adapters must be used.
These adapters allow a bias voltage to be injected into the antenna cable. It is important to keep multiple antennas feeding a common receiver input as isolated from each other as possible in order to minimize potential phase cancellation that could result in signal dropout. Certain receiver designs will be better equipped to deal with this situation than others, but it is a worthwhile precaution nonetheless.
Several closely-spaced, high-power transmitters suffer from excessive intermodulation a transmitter interaction that produces additional frequencies problems. In this case, a passive combiner should be used for combining two transmitters. For more than two, though, an active combiner is recommended.
An active antenna combiner will typically accept between 4 to 8 transmitters. Unlike active antenna distribution systems, which can be cascaded together for larger setups, active antenna combiners should never be actively cascaded. If more than one combiner is needed to combine all the transmitters together, a passive combiner should be used to connect two active combiners together.
As always, be aware of any extra losses incurred with the passive combiners. Similar to active antenna distribution systems, active combiners also have a specified frequency bandwidth. Be sure to select the proper bandwidth for the given transmitter frequencies.
In most wireless microphone applications, there is rarely a single element that causes the whole system to fail, but rather an aggregation of bad practices that leads to poor performance.
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