The WiNRADiO WR-G39WSBi Sonobuoy Receiver is a third-generation receiver specifically designed for sonobuoy telemetry operation.

It is particularly suitable for standard DIFAR sonobuoys operating in the 136 to 173.5 MHz standard sonobouoy VHF band. This standard frequency range can be extended to UHF frequencies (up to 1.8 GHz) to suit customized telemetry requirements.

The WR-G39WSBi features an antenna input, analog output, as well as digitized audio output via the PCI bus for spectrum analysis and monitoring.

The fully self-contained receiver resides on a standard PCI-bus card designed to be installed in a standard or industrial-grade PC. The receiver is supplied together with Windows control software (Linux support is optional) and support documentation.

The receiver's modular architecture allows for a high-degree of customization for application-specific requirements. The receiver also contains its own DSP, making it possible to develop customized solutions featuring various on-board signal processing, analysis and decoding facilities.

WR-G39WSBi Sonobuoy Receiver

As most of the 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. WiNRADiO can also supply complete rack-mounted multi-channel systems.


The WR-G39WSBi receiver is supplied with Windows based application software. Programmers' API and Linux drivers are available upon request, suitable for integration in 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 the real-time spectrum of the demodulated signal observed. An mixing facility is provided where a particular receiver can be selected for audio monitoring by simply clicking on the corresponding receiver panel.

WR-G39WSBi Virtual Control Panel
WR-G39WSBi Control Panel

Technical Specifications
Frequency range 136.000-173.500 MHz
Channel spacing 375 kHz
Modes FM (DIFAR)
Sensitivity 0.9 ÁV
IF bandwidth 230 kHz @ -6 dB
Skirt selectivity 470 kHz @ -25 dB
730 kHz @ -60 dB
Frequency response 5 Hz to 25 kHz @ ▒ 1 dB
5 Hz to 40 kHz @ ▒ 2 dB
Output level 1.0 ▒ 0.2 V rms @ 75 kHz deviation and 1 kHz modulation frequency
RSSI range 80 dB typ.
Image rejection 70 dB or better
Tuning accuracy ±1 ppm
Frequency stability ±0.5 ppm
Input impedance 50 ohm
Output impedance 600 ohm
Connectors SMA for RF input and demodulator output; 3.5 mm audio jack for monitor output
Interface PCI 2.2 compliant
Total power consumption 6 W
Dimensions Length: 195 mm (7.68")
(excluding mounting bracket)
Height: 99 mm (3.90")
(excluding edge connector)
Thickness: 19 mm (0.75")
(incl. components on either side)
Weight 330 g (11.6 oz)
Ambient temperature Storage: -20║ to +75║ C
Operation: 0║ to +45║ C

Specifications are subject to change without notice due to continuous product development and improvement.

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