The SDR-4 receiver covers from 0.85 to 30 MHz and follows on from our existing SDR Receiver with a Si570 low noise synthesised VFO, relay switched band pass filtering, a power FET RF amplifier and a built-in USB soundcard.
Key design features include:
Antenna isolation transformer with a 50 or 450 ohm impedance input for use with coax fed antennas or random wire antennas
Extra antenna isolation when the receiver is powered down
Relay switched RF band pass filters
RF amplifier using a power MOSFET in receiver front end
Internal 10 MHz RF level calibration oscillator
Built-in USB stereo soundcard
3.5mm soundcard audio output for headphone monitoring or connection to datamodes program
Built in a compact aluminium case 175 x 106 x 30 mm
We will launch the SDR-4 receiver at the RSGB National Hamfest on 30 September/1 October 2011.
The price will be ?149.95 plus shipping. At current rates that’s $243.32 or 170.94 Euro.
The SDR-4 setup program can be downloaded as a zip file here . This installer program stores the USB drivers in a folder C:/SDR-4 and places the ExtIO files in the HDSDR and Winrad folders. When the SDR-4 receiver is plugged in for the first time direct the driver installation wizard to C:/SDR-4/Driver and the USB driver will load automatically.
A block diagram of the SDR-4 receiver can be downloaded here
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