A virtual press conference from Sound & Video Contractor


Intelix AVO-A2MINI-WP-F mounted with a remote audio recorderMiddleton, WI—Installing and maintaining audio systems outdoors often presents unique challenges, especially when the goal is to transmit high-frequency bat calls long distances without sacrificing signal integrity. Mike Balistreri, owner of Avian Consulting Services (ACS), was recently faced with that exact challenge.

“The need to mount bat detectors on towers at heights in excess of 50 meters is one of the common technical problems that must be overcome while designing and implementing pre- and post-construction wind site monitoring plans,? explains Mr. Balistreri. “Difficulties and expense of erecting the support towers aside, the bat researcher is faced with the dilemma of gaining access to the recorded data. Common solutions to this problem have included the use of telescoping towers, microphone extension cables, and FM or other wireless transmission devices. Unfortunately, all of these methods have inherent physical or electronic deficiencies and limitations.?

To overcome the problems inherent in other systems, ACS installed two Intelix AVO-A2MINI-WP-F baluns on each audio cable run. The AVO-A2MINI-WP-F transmits two channels of analog audio over standard twisted pair cabling, such as Cat 5 or Cat 6. In the case of ACS’s application, an exterior-grade, UV resistant cable was used.

“As a further advantage, these baluns are self-powered and do not require an internal or external power source,? elaborates Mr. Balistreri.

Designed for transmitting audio and video signals extended distances, baluns balance unbalanced AV signals thereby making the necessary impedance adjustment for sending signals over different wiring systems. In addition, Intelix baluns feature extremely high quality isolation transformers and common mode chokes to ensure full hi-fidelity audio performance and eliminate ground loop interference.

“Many bat detector-recorder systems commonly suffer from ground loop interference,? explains Mr. Balistreri. “This occurs when a detector, which typically runs off of 12 volts, is connected to the same power supply as the recorder, which may run off of four or five volts via a voltage reduction circuitry. This difference in potentials produces an unwanted current that shows up as a low-level background noise on the recordings. This interference can be compensated to some degree by decreasing the input gain on the recorder. However, in doing this, the system becomes less sensitive to the weaker bat calls. The baluns effectively break the ground loop by electronically isolating the detector and recorder, making clean, non-interfered recordings possible.?

Mr. Balistreri relied on Full Compass Systems, a leading audio-visual distributor, for preliminary design assistance and for purchasing the Intelix equipment. “The folks at Intelix and Full Compass have been very helpful and are eager to explore unique applications of their products.?

About Avian Consulting Services. Founded by Mike Balistreri, Avian Consulting Services (ACS) provides top-level environmental consulting services to the wind energy industry, including pre- and post-construction plant and wildlife surveys. ACS can be contacted online at www.acswind.com, or by phone at 505-235-8425.

About Full Compass Systems. Founded in 1977, Full Compass is a national leader in professional audio, professional video, AV, and lighting sales and rentals. Full Compass can be contacted online at www.fullcompass.com, or by phone at 800-356-5844.

About Intelix. Intelix offers the broadest line of baluns in the professional AV marketplace, including solutions for multiple formats of audio and video, VGA, DVI, HDMI, USB, and PS2. In addition to baluns, Intelix manufactures an extensive line of serial controlled mic/line, matrix, room-combine, and automatic mixers. Complete product information is available online at www.intelix.com, or by phone at 866-4-MATMIX.

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March 2008
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