The SDR-4+ is an HF general coverage SDR receiver covering from 0.85 to 40 MHz.
It has a Si570 low noise synthesised VFO, relay switched band pass filtering, ultra high IP3 E-PHEMT 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 now using a ultra high IP3 E-PHEMT RF amplifier in the receiver front end
Built-in USB stereo soundcard
3.5mm soundcard audio output for headphone monitoring or connection to datamodes program
3.5mm IQ audio output for connection to external high sampling rate sound cards
Built in a compact aluminium case 175 x 106 x 30 mm
Following customer feedback and design work on our HF/VHF/UHF Multicoupler we have revised the SDR-4 and released the SDR-4+. This has a revised RF front end using a ultra high IP3 E-PHEMT RF amplifier, an IQ audio output to feed external sound cards and other revisions to improve RF performance, gain distribution, IQ balance and the SDR display.
The price of the revised SDR-4+ receiver is ?169.95 plus shipping. At current rates that’s $258.32 or 198.84 Euro.
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Source (Link) to DX-Patrol Company