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Lectrosonics Innovates with Bounded Squelch

Lectrosonics, a manufacturer of wireless microphone systems and audio processing products, introduced a new feature for its Digital Hybrid Wireless receivers that limits the range of the system without altering transmitter power.

Lectrosonics VRM with Bounded Squelch

Lectrosonics VRM with Bounded Squelch

Lectrosonics, a manufacturer of wireless microphone systems and audio processing products, introduced a new feature for its Digital Hybrid Wireless receivers that limits the range of the system without altering transmitter power. The new Bounded Squelch feature is in response to users concerned about leakage of wireless microphone transmissions when several facilities are in close proximity, such as theaters in downtown areas or adjacent TV studios, company officials said. The traditional method of limiting range by using very low transmitter power is demonstrably a poor solution and has become less and less effective due to rising RF noise floors in urban areas, according to Lectrosonics. Moreover, the continual deployment of white spaces devices may cause increasing problems with low-power transmissions.

Bounded Squelch solves the cross interference of close installations by measuring the precise latency (delay) between transmitter and receiver, cross-referenced to the specific transmitter frequency chosen. Since RF transmissions operate at virtually the speed of light, this latency can be precisely calculated.

"This breakthrough should have a major impact on the theatre market," said Larry Fisher, president of Lectrosonics, in a statement. "Now two stages that are 500 feet apart can each set the Boundary Squelch on their receivers for 250 feet, allowing plenty of range for each stage and completely eliminating pesky cross interference."

Fisher said that users should make sure to use the correct Nominal Velocity of Propagation (NVOP) for their antenna cables to remove the added delay of the cables. For instance, a 50-foot length of Belden 9913 with a NVOP constant of 84 percent would add an additional delay of about 60 feet. This must added to the desired distance value at the receiver.

A secondary benefit of Bounded Squelch is the automatic removal of RF reflections, since multiple reflections have a longer path length. Thus, diversity may no longer be needed for dropout-free reception, thereby reducing system cost, according to the compant

Bounded Squelch is part of firmware version 4.01.11 and will be available for download from the Lectrosonics website. Included in the firmware update package is an iPhone app that includes a map of all known theaters, churches, civic venues, TV studios, and film sets, and the exact distances between them. Users can call up a specific location by zip code and have access to the data needed to set up their Bounded Squelch receivers.

 


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