Rik'ART System, first introduced by DC Audiovisuel, is a unique system for optimizing RF reception of up to 8 "true diversity" Radio Mike systems in the 470-870 MHz band. RIK'ART was designed and manufactured by RIK'ETUDE according to DC Audiovisuel's specifications. The system consists in two wideband UHF antennas, and a RF power splitter providing 2x8 RF outputs.
Right after Issac Newton's "Mathematical Principles of Natural Philosophy" come "Rik'ART (Terrestrial Radio Antennas) Biquad Antenna Principles". Rik'ART system includes four major components:
A) The CPL2X8 is a RF power amplifier and splitter, also named a "coupler". It provides 2 inputs for the antennas, and 2 X 8 outputs, for feeding up to 8 true diversity Radio Mike receivers. Each input is fitted with a 5th order bandpass filter, a high dynamic RF amplifier and an 8 outputs power splitter. The 3rd order intermodulation equivalent input power level is 39 dBm, thus allowing a 80 dB dynamic range for a -1 dBm input power level. Due to this excellent feature, the system offers a great linearity, even with a high level of interference.
B) Two directional antennas are connected to the CPL2X8. A passive antenna offering 10 dB gain allows, in theory, to increase the range by a factor of 3 (range is inversely proportionnal to the square of the distance between emitter and receiver). Of course, this antenna can only be used on the receiver side of the Radio Mike system. When connected to the CPL2X8, two antennas therefore allow feeding 8 true diversity RM receivers with the RF signal. The two antennas must be perpendicular to each other, with a 2.3 feet spacing, and 5 feet above the ground. The relative orientation (90°, cross polarized) of the antennas is mandatory to protect the reception of signals within close frequencies or at the same frequency. This technique minimizes mutual interferences, especially when the signals come from the same source but follow a different path ("Fading").
C) A single twin-antenna unit is also provided, when space is at premium, i.e. when the two main biquad antennas are too bulky for the shooting location. This small antenna unit is fitted with a stand and can be set on the CPL2X8.
D) A radio interference analyser (A.I.R). A.I.R is a handy, portable and standalone spectrum analyser which operates in the 470-870 MHz range; it collects measurements of the RF field and displays the frequency bands free from disturbances, according to the frequencies of the Radio Mike systems previously stored. With all RM transmitters turned off, simply connect AIR to the CPL2X8 (any output), and get a view at once of the RF interferences on the shooting set. Then accurately rotate the antennas in order to minimize the level of the disturbing frequencies, and therefore to improve RM reception.
After several monthes practice and some sound mixers comments, we have adapted the general ergonomics of the system for a mobile use on set that implies quick mounting.
Rik'ART system (to be used without restraint), is provided by DC Audiovisuel with each complete 6-8 radio mike set.
- a CPL2X8 splitter
- two directive antennas with fast plug mounting
- a small monobloc double-antenna
- sixteen push-pull SMA-SMA jacket
- two low dissipation SMA-SMA for big antennas
- a radio frequencies analyzer A.I.R.
The complete set is packed in an easy transportation SACCAR box.
Rik'ART system is also available on sale.
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