Cross Country Wireless SDR-4+ Special Edition general coverage receiver
We have been manufacturing the SDR-4+ receiver for 6 years. Over that time it has had undergone a process of gradual improvement with several custom versions made for some customers.
The SDR-4+ Special Edition brings all the changes together in one high performance SDR receiver combining a high IP3 push pull RF amplifier and switching mixer with improved RF filtering and a new low distortion and noise IQ amplifier.
The SDR-4+ Special Edition 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 push pull 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
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 uses the same high IP3 push pull amplifier as used in our HF Multicoupler 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
Ability to select sampling rates down to 8 kHz so that a single transmission can fill the SDR waterfall display. Perfect for on-air monitoring of broadcast stations.
3.5mm IQ audio output for connection to external high sampling rate or 24 bit 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
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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: +31 dBm (measured with two -2 dBm carriers 12 MHz and 13.5 MHz)
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+ Special Edition 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.
Existing owners of SDR-4+ receivers can have their receivers upgraded to the new Special Edition specification. Contact us via firstname.lastname@example.org for more details.
The first YouTube video is a demonstration of the strong signal handling performance of the SDR-4+ Special Edition. The receiver is listening to the background noise floor in a small gap between the strong broadcast stations in the 41m short wave broadcast band. There is a 70 dB difference between the station carriers and the background noise. .
The second YouTube video is from our distributor LAM Communications giving details of the setup and use as a panadaptor.
Here is a list of sample HDSDR recordings taken over the years. A selection of SDR-4, SDR-4+ and Sentinel 2 receivers undergoing a final on-air test after bench testing are used and in one case a faulty receiver back for repair. These are taken using our antennas above the workshop, it's not a low noise environment!
If you have never used a SDR receiver before, download the HDSDR program from here and one of the recording files below. Open the HDSDR program and use the playback key to find and start the recording. Each recording is about 10 minutes long and you can use the tuning, filters and modes in HDSDR as if you were connected to the receiver. It's a great way to try it out and it's free.
Sample HDSDR RF recording using a SDR-4+ receiver and 40m dipole (99.5 MB) SSB field day contest 2017 40m SSB
Sample HDSDR RF recording using a SDR-4 receiver and 40m dipole (155.7 MB) Typical evening activity in 2012 on 40m SSB
Sample HDSDR RF recording using a SDR-4 receiver and 40m dipole (131.8 MB) Typical morning activity in 2014 on 40m SSB
Sample HDSDR RF recording using a SDR-4 receiver and 40m dipole (174 MB) Typical afternoon activity in 2014 on 40m SSB
Sample HDSDR RF recording using a SDR-4+ receiver and 40m dipole (107 MB) Early morning DX pileup in 2015 on 40m SSB
Sample HDSDR RF recording using a SDR-4+ receiver and Cobweb antenna (135 MB) Deliberate interference to the K1N DXpedition in 2015 on 15m SSB. Caution - strong language!
Sample HDSDR RF recording using a SDR-4+ receiver back for repair and Cobweb antenna (118 MB) ARRL HF contest in 2015 on 15m SSB.
Sample HDSDR RF recording using a Sentinel 2 receiver and single delta loop antenna for 20m (124 MB) 20m data modes activity in 2017 on 20m SSB.
Sample HDSDR RF recording using a Sentinel 2 receiver and single deta loop antenna for 20m (123 MB) CQ WW SSB contest in 2017 on 20m SSB.
Contact us via email@example.com
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