Cross Country Wireless SDR-4+ general coverage receiver...frequency range extended to 70.5 MHz
The SDR-4+ is an HF general coverage SDR receiver covering from 0.85 to 70.5 MHz.
It has a Si570 low noise synthesised VFO, relay switched band pass filtering, ultra high IP3 InGaP HBT RF amplifier and a built-in USB soundcard.
Key design features include:
Antenna isolation transformer with a 50 ohm impedance input for use with coax fed antennas
Extra antenna isolation when the receiver is powered down
Relay switched RF band pass filters
RF amplifier now using a ultra high IP3 InGaP HBT 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
In March 2012 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 InGaP HBT 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.
September 2013...As a result of development work on the CCW Sentry SDR transceiver the frequency range of the SDR-4+ has been extended to cover the 4m amateur band. The frequency coverage is now 0.85 to 70.5 MHz. This new version also includes a revised USB sound card and a new antenna isolation transformer with a 2 kV working voltage rating without the 450 ohm antenna input.
March 2014...As a result of further development work on the CCW Sentry SDR transceiver the RF amplifier has been changed to a ultra high IP3 InGaP HBT device, the I/Q amplifier has been changed to a higher spec amplifier. The receiver IP3 measurement at full gain (attenuator off) is now +10 dBm measured with two -20 dBm carriers 20 kHz apart at 14 MHz.
The price of the revised SDR-4+ receiver is £179.95 plus shipping. At current rates that's $295.81 or 219.32 Euro.
Frequency range: 850 kHz to 70.5 MHz
Input impedance: 50 ohms
Clipping RF level: -13 dBm
Maximum frequency display: 48 kHz internal sound card, up to 192 kHz external sound card
Minimum discernable signal: -135 dBm
Input IP3: +10 dBm (measured with two -20 dBm carriers with 20 kHz spacing at 14 MHz, attenuator off)
Receiver modes: Depends upon the SDR software used with the receiver
Supply voltage: 5 Volts (from USB ports)
Supply current: 320 mA (from USB ports)
Connectors: BNC female (RF in 50 ohms), two USB B ports, two 3.5mm stereo jacks
Overall dimensions: 185 mm (L) x 110 mm (W) x 38 mm (H)
As the InGaP HBT RF amplifier used in the SDR-4+ is a "dual-use" device i.e commercial and military under the EU Dual-Use Regulation - currently Council Regulation (EC) No 428/2009 we cannot export the receiver to certain prohibited countries. We also need proof of customer identity. Payments by PayPal with a confirmed address meet the identity proof requirement.
The SDR-4+ receiver set-up FAQ sheet can be downloaded as a PDF file here .
The SDR-4+ receiver Quick Start Guide v1.6 can be downloaded as a PDF file here .
The SDR-4+ USB driver installer can be downloaded as a zip file here . The USB installer program loads a driver certificate then the driver file so that it works on the lastest versions of Windows.
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 in Program Files and Program Files (x86).
The SDR program we recommend for first time users of SDR receivers is HDSDR which can be downloaded here .
A SDR-4+ receiver running on the WebSDR system can be accessed here .
Authors of SDR software programs or other radio programs can add support for the SDR-4+ to their software using the SDR-4+ interface specification.
Please note that we have no connection with the eBay seller Pandatron or Pandatroncz based in the Czech republic. They are selling a receiver called the SDR-5+. It's in a similar case to our SDR-4+ and even has yellow antenna sockets. Unfortunately it appears to be a blatant case of plagiarism. If there is any doubt please check their eBay feedback!
Contact Chris Moulding, G4HYG via info@
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