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, high linearity silicon germanium 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
RF overload protection up to 150W for 10 seconds
Extra antenna isolation when the receiver is powered down
Relay switched RF band pass filters
RF amplifier now using a high linearity silicon germanium amplifier in the receiver front end
Built-in 16 bit USB stereo soundcard gives 89 dB dynamic range. Typically 8 bit SDR dongles have 45 db and 12 bit SDR receivers have 70 dB dynamic range. The total dynamic range is limited by the sound card so the receiver has a socket to connect to a external 24 bit sound card if required
3.5mm IQ audio output for connection to external high sampling rate sound cards
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 for full RF shielding
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 2017...As a result of further development work following the unavailability of the original component the RF amplifier has been changed to a high linearity silicon germanium device. The receiver IP3 measurement is now +16 dBm measured with two -2 dBm carriers 200 kHz apart at 14 MHz.
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)
The SDR-4+ receiver no longer uses "dual use" (military/commercial) devices so it can now be sold without restriction.
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 latest 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).
This is a link to our CloudMe folder allowing the files included on the CD shipped with each receiver to be downloaded here .
The SDR program we recommend for first time users of SDR receivers is HDSDR which can be downloaded 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.
The first YouTube video is from our distributor LAM Communications giving details of the setup and use as a panadaptor.
Contact Chris Moulding, G4HYG via Email address hidden from spambots for more details.