Description
Description
The Syndetix HEATR system is a small, self contained, battery powered, and ruggedized digital receiver used to assist an operator in determining the direction to an emitter. HEATR can operate against several different systems by using the correct antenna and recalling the appropriate calibration tables from the embedded FLASH memory. The user configures the receiver using an intuitive menu and a four way navigation switch.
In brief, each of the major components of the HEATR system will be discussed. Major components include: the antennas, RF/IF card, the digital receiver, the battery system, and the user interface.
All HEATR antennas utilize an advanced micro-strip patch technology that produces an antenna with a thin depth, directivity, and bandwidth in excess of the defined systems. The antennas are mechanically protected by an additional layer of dielectric material bonded over the patches and a metallic ribbed exterior. Antennas are connected to the receiver using a coaxial cable that is keyed for a positive connection. HEATR antennas contain active elements that filter and amplify the desired signal, maximizing the sensitivity of the system.
The RF/IF card uses a wide bandwidth PLL circuit, followed by a high speed divider. This combination, followed by a broadband down-converting mixer allows the HEATR system to track signals from 150MHz to 2400MHz. After down-conversion, the Intermediate Frequency (IF), is filtered, and then passed to the digital receiver.
The digital receiver employs a mixed-signal IF to baseband receiver consisting of dual 12-bit 65 MSPS ADCs and a wideband multimode Digital Down-Converter (DDC). The receiver incorporates several reconfigurable digital filters with programmable coefficients and decimation rates. The receiver block also has dual discreet Fast Fourier Transform (FFT) engines which process the receiver data and make angle and magnitude measurements. Data from the receiver is processed in a Field Programmable Gate Array (FPGA) with utilizes a NIOS2 soft processor. Because the receiver uses an FPGA, the system is very flexible and can be retargeted to signals in a variety of systems.
The battery system used in HEATR has two high density lithium polymer batteries. A small circular two pin connector, when connected to DC voltages from 10 to 15V, charges the internal batteries and/or extends the operational time. The battery power is converted to operational voltages by DC/DC converters for maximum efficiency. With the use of the high density batteries and the converters, operational testing has shown continuous operation for five (5) hours before recharging.
The basic HEATR user interface has a display, lockout switch, 4-way navigation switch, and a stereo headphone output. The display is a simple 2-line 16-character LCD display with a dimmable backlight. The lockout switch is used to prevent unintentional changes to the system configuration without user knowledge. The 4-way switch provides the basic receiver control allowing the operator to select the system type, channel/frequency, and other operational features. The headphone jack will allow the user to listen to the detected RF signals without the need to look at the display. Both changes to the pitch of the signal and stereo techniques will be employed to improve the audible indicators for the operator. Optionally, a Bluetooth headset is available, eliminating the need to use the headphone jack.
HEATR has the following capabilities.
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HEATR system is comprised of the following:
1.HEATR Receiver Unit
2.External Charger
3.Stereo Headphones
4.Bluetooth Headphones
5.Large Antenna (813 MHz)
6.Large Antenna (836.5 MHz)
7.Large Antenna (897.5 MHz)
8.SWIM Antenna (400-500 MHz)
9.Small Antenna (1645 MHz)
10.Small Antenna (1747 MHz)
11.Small Antenna (1880 MHz)
12.Small Antenna (1950 MHz)
