CCW logo

Cross Country Wireless SDR-4+ general coverage SDR receiver...frequency range extended to 70.5 MHz

CCW SDR-4+ Receiver

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 E-PHEMT RF amplifier and a built-in USB soundcard.

Key design features include:

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 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.

August 2013...Following recent customer feedback and design work on a new project we are releasing a new version of the SDR-4+. This has improved frequency coverage up to 55 MHz including the 6m amateur band, a revised USB sound card and a new antenna isolation transformer with a 2 kV working voltage rating without the 450 ohm antenna input.

September 2013...As a result of development work on the CW 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.


As the E-PHEMT 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+ 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). 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 if the PC is in Administrator mode.

The SDR program we recommend for first time users of SDR receivers is HDSDR which can be downloaded here .

A block diagram of the SDR-4+ receiver can be downloaded here .

A SDR-4+ receiver running on the WebSDR system can be accessed here .

Existing users of SDR-4 receivers can return them for upgrade to the SDR-4+ specification for £20.00 ($31.40 or 24.00 Euro) plus the cost of return shipping.
This offer also applies even if you didn't buy the receiver direct from Cross Country Wireless.

Contact Chris Moulding, G4HYG via for more details.

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 Email address hidden from spambots for more details.

Back to Index

Rate this site

(with 10 = top)