Kaltman's Breakthrough Wireless Solution: The RF ResQ

Kaltman Creations LLC, makers of the Invisible Waves brand tools for handling wireless interference, announce a breakthrough solution to the RF congestion and “spectrum squeeze” issues that have plagued the pro audio industry in recent years.

“We secured the rights and ownership to advanced filtering technology that was previously used in military, nuclear plant and critical data communications,” says Kaltman Creations president Mark L. Kaltman, “and adapted it for the UHF bands used in pro audio wireless.” The company’s new RF-ResQ (Receiver Enhancement System) is an antenna signal processor that can rescue and salvage unusable RF spectrum, substantially reduce interference and more.

Housed in a rugged single-rackspace unit, the RF-ResQ is the world’s first standalone wireless microphone filtering system employing multiple military-spec, high-Q bandpass filters. ResQ will clean up the received RF spectrum, allow for closer adjacent channel spacing (potentially doubling available channel counts without sacrificing power), remove the issue of intermodulation effects, and improve the reception of weaker transmissions.

RF-ResQ’s onboard 8-channel antenna distribution amplifier with RF router allows its filters to adapt to various receiver and distribution configurations. This provides one filter/frequency per receiver channel, which ultimately means that the user’s receiver only sees its assigned transmitter frequency and nothing else — with no out-of-band RF interference to bog down or de-sensitize the receiver’s input. Alternatively, users can select “combined signal routing” to feed integrated receiver/distribution systems, as found in some newer digital mic systems.

RF-ResQ assigns a single, frequency-cleaned-up, bandpass filtered feed for each transmitter’s frequency, and its eight amplifiers can maximize the individual RF signals up to 10 dB. This means that there’s no need for an amplified antenna. Or as Kaltman explains, “Why amplify all of the RF — including the RF noise — when the ResQ amplifies only specific frequencies as needed?”

DiverseQ, the RF-ResQ’s new antenna diversity technology, pre-filters the antenna A/B signals in the IF stage for fast, accurate and quiet antenna switching. This improved, ‘best signal detection’ function is performed within the RF-ResQ, so there’s no need for a two-antenna connection at the receiver input.

Installed between the antennas and receivers, the RF-ResQ works with industry-standard antennas, in analog and digital wireless mic systems in the 470 MHz to 928 MHz range; one model — worldwide. Frequency, gain and routing assignments are easily performed via a LAN or USB/laptop connection to the rack unit. With its router capability, the RF-ResQ can be used either as a direct replacement or in conjunction with existing antenna distribution system.

“The RF congestion solution is not at the transmitter or receiver,” adds Kaltman. “For peace of mind in critical wireless applications, the solution is a RF-ResQ.”

Below are photos of the unit, before and after results and a software screenshot: