Remote Audio Miracle Whip UHF Antenna Kit with SMA Connector

Accessories visible on product image are not included

¼ Wave Whip 
The ¼ Wave Whip antenna are very common in both transmitter and receiver wireless devices.  Whips are omni-directional antennas and are mostly seen on bodypack transmitters and camera back receivers.  The advantages of the ¼ wave whip antenna are the portability but these antennas cannot be remotely mounted because it relies on the chassis of the transmitter or receiver for its ground plane.  ¼ Wave Whip antennas are narrow bandwidth of around 60MHz and the center frequency of the antenna’s range is determined by the length of the antenna.  

When using bodypack transmitters, keep some distance around the antenna. Allowing the antenna to touch skin or damp clothing directly will dramatically reduce the transmitter’s RF output. Just a few mm of distance from the skin can result in 10 dB more output, which has a direct impact on the range of the system.  Folding or bending the antenna by inserting antenna-first into a pocket, etc, dramatically reduces the effectiveness of the antenna.    

When to use: ¼ wave whip antennas are normally used in portable systems, such as one or two RXs being deployed in a bag, or when the RX is mounted on and linked to a camera.

 

 

Half Wave Dipole
Compared to ¼ wave whips, half wave dipole antennas have an improved system range. Like ¼ wave whips, dipoles are omnidirectional. An important benefit of the half wave dipole is its ability to be remotely mounted due to its built-in ground plane.   

Dipole antennas have an operating bandwidth of approximately 50-60 MHz, so check that the antenna is designed for the intended frequency range. This is especially important when using receivers which tune across a broad range. Some dipoles are frequency adjustable, which allows the center frequency to be tuned. 

When to use: For bag use, portable dipole antennas can be clipped to a bag or strap and connected via cable to an RF distribution amplifier or a slot mount rack. Dipole antennas can also be used on carts, especially in small studio environments. 

 

 

Log Periodic Dipole Array or LPDA 
LPDA antennas, or log periodic dipole array, are a common directional antenna used for wireless microphone systems. On a sound cart, LPDA are used for both receiver and IFB transmitter applications. LPDA, sometimes referred to as “shark fin” antennas, are remotely mounted. These directional antennas have a theoretical gain advantage of up to 8 dB over a ¼ wave whip. Some LPDA antennas include active circuitry. Active antennas have built-in RF amplifiers which can be engaged to make up for signal loss with long cable runs.  Make sure to activate bias power on the receiver when operating active antennas or booster amplifiers.  

When transmitters are in close proximity to an LPDA antenna, there is a potential to overload the receiver. Reduce TX power or deploy RF attenuation after the antenna, before the receiver. 

When to use: LPDA antennas are best used outdoors or to increase the range of the system. LPDA are directional, so ensure that the transmitters are in the field of view of the antennas when in use. These antennas operate over a wider range of frequencies than the ¼ Wave Whip and Half Wave Dipole.

 

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