SI-8646 Talon Multichannel VHF/UHF Receiver

4 Channels, 20 MHz - 6 GHz, 40 MHz Bandwidth Receiver

The Talon Receivers are a family of quad-channel receiver/signal processors designed to meet the most demanding real-time applications, while providing dramatic reductions in size, weight, power and cost per channel relative to existing solutions. Talons feature four 2 MHz to 6 GHz receive channels that can be operated independently or together phase-coherently. Their low phase noise synthesizers and channel-to-channel phase tracking make them ideal for direction finding and beam forming applications. Superlative dynamic range and tuning speed round out a performance that is provided in either the SI-8646’s 1U half-rack chassis or the the SI-8646-1’s 2U half-rack chassis. The SI-8646-1’s expanded package allows operation in high-dust environments and includes an on-board ac power supply. 

The Talons’ sweep/step capability and tuning speed of less than 50 microseconds increases the likelihood of intercepting intermittent signal activity and frequency hoppers. Signal fidelity is preserved in difficult signal environments by selecting pre-digitization filters of 40, 25, 10, or 3 MHz with excellent passband ripple and group delay variation. Oversampling of incoming radio frequencies (RF) by analog-to-digital converters (ADCs) at a 128 MHz rate provides excellent signal reconstruction and minimizes noise and phase distortion. The Talons provide extensive digital signal processing (DSP) capabilities utilizing a Xilinx Kintex-7 field programmable gate array (FPGA), a Virtex-6 FPGA, large high-speed memory devices and an eight-channel FLEX Digital Downconverter (DDC) with resampler. The Talons’ processed digital outputs are formatted as industry standard VITA Radio Transport (VRT) packets. The transported VRT packets include precision time-stamped real or complex digital IF (ADC) output data in real time. The data outputs are via a fiber optic 10GBASE-SR Ethernet interface. Control of the Talons is achieved utilizing a 10/100 Base-T Ethernet port. 

Talon hardware and firmware designs are configurable and expandable to allow for the use of Leonardo DRS’s latest DSP intellectual property (IP) to include special digital filters, fast fourier transforms (FFTs) and advanced wireless demodulation capabilities.


  • Selectable Channels and Bandwidths Within a Small Package - Packaged in a 1U half-rack chassis are eight independent DDCs and four RF channels. Each RF channel has a maximum instantaneous bandwidth of 40 MHz with selectable analog bandwidths of 3, 10, 25 and 40 MHz.
  • Designed to See the Smallest Signals in the Presence of Strong Interference - The Talon design provides state-of-the-art dynamic range and phase noise performance. Up to four units may be daisy-chained and synchronized for independent or phase-coherent operations.
  • Specialized DDC Firmware/Software Loads Customized for Specific Requirements - These loads are customized to meet the unique requirements of the customer, and can include specific bandwidths, frequency step scan tables, I/Q data sampling frequencies, and attenuation values.

SI-8646-1 Rugged Talon

DRS Signal Solutions Rugged Talon Tuner
A Rugged Receiver for Dirty Air Environments

A 2U half-rack chassis with four rear-mounted fans designed to operate with an 85 to 265 Vac input power in high-dust environments and at ambient temperatures ranging from -20 to +40 degrees Celsius.

SIGINT Tuners & Receivers
SIGINT Tuners & Receivers

DRS Signal Solutions products are suitable for commercial applications and adaptable for land, sea and air operations across a variety of platforms as well as tactical, man-portable capabilities.

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SI-8646 Talon Multichannel  Receiver
An RF front-end tuner to a SIGINT subsystem.

When integrated with a DSP subsystem, Talon provides extensive digital signal processing capabilities.

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