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   WR-2902i
WR-2902i Sonobuoy Receiver

The WiNRADiO WR-2902i VHF/UHF Sonobuoy Receiver is designed to receive signals from analogue (DIFAR) and digital (BARRA) sonobuoy transmitters, operating in the 136 to 173.5 MHz frequency range. This standard frequency range can be easily extended up to 1.5 GHz to suit special requirements. The receiver is especially suited for high-performance multi-channel systems.

The WR-2902i is a triple conversion superheterodyne receiver. It features a single antenna input, separate analog and digital signal outputs, and an audio output for monitoring.

The fully self-contained receiver resides on an ISA card designed to be installed in an industrial PC, together with control software and support documentation. As all RF signal processing is performed by the card, the PC hardware and software requirements are modest. Up to eight cards can be plugged into the same computer, and controlled separately and independently. With minor reconfiguration, this number can be increased to 64. WiNRADiO can also supply complete rack-mounted multi-channel systems.

The WR-2902i receiver is supplied with Windows based application software and a DLL library developed for easy system integration into custom designed sonobuoy systems.

The Windows application software shows a graphical representation of all installed receivers (a virtual control panel), making it possible to observe the status of all receivers at a glance and make individual adjustments if necessary. Each receiver can be monitored, and a mixing facility is provided where a particular receiver can be selected for audio monitoring by simply clicking on the corresponding receiver panel.

WR-2902i Virtual Control Panel

     WR-2902i Control Panel (a portion only shown)

Technical Specifications

Frequency range136.000-173.500 MHz
Channel spacing375 kHz
ModesAnalogue FM (DIFAR),
High speed digital (BARRA)
Sensitivity0.9 µV (DIFAR),
1.5uV (BARRA)
IF bandwidth230kHz @ -6dB
Skirt selectivity470kHz @ -25dB
730kHz @ -60dB
Frequency responseLess than ± 1 dB variation from 5 Hz to 25 kHz (analog)
5Hz to 150kHz (digital)
Output level1.0 ± 0.1V rms @ 75kHz devn. and 1kHz mod. frequency (DIFAR),
TTL compatible (BARRA)
RSSI rangeExceeds 60dB for 5dB linearity
Image rejection80 dB or better
Frequency stability±20 ppm or better
Input impedance50 ohm (nominal)
ConnectorsThree BNC jacks:
RF input, DIFAR output, BARRA output;
One 3.5mm audio jack for monitoring
Power requirements
from PC bus		+12V @ 350mA
+5V @ 26mA
-12V @ 49mA
Total power consumption4.9 W
Dimensions295 x 115 x 20 mm (11.61" x 4.53 x 0.79")
Mass637 g (22.3 oz)
Ambient temperatureStorage: -20º to +75º C
Operation: 0º to +45º C

(Specifications are subject to change without notice.)


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