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Features + Specifications

SDR Cube Transceiver



The SDR Cube is a totally self-contained, embedded SDR transceiver for CW, SSB and AM using a Softrock for the RF front end and a pc board implementation of an HF modem.  PC is not needed for using the SDR Cube, as all DSP processing is accomplished by an embedded DSP processor on the three internal pc boards.  The Cube is designed to fit into an optional 4 x 4 x 4.5 pre-cut,black powder-coated aluminum enclosure containing all controls, a blue graphic display indicating transceiver settings and an exciting 8 kHz-wide band scope of spectrum signals, and the popular Softrock RXTX v6.3 board.  The SDR Cube may also be used with any of the 11,000 other Softrocks in the field today!  Sold as a kit or as a fully assembled & tested transceiver, both the product versions are in stock.  We presented on the SDR Cube at TAPR's annual "Digital Communications Conference" in Portland, Oregon, and the DCC Proceedings containing our paper is available in our Documentation page.  Product details are presented here on this website, and active email discussion occurs in the SDR-Cube Group in Yahoo Groups





Important Note: Parameters listed below with an asterisk (*) are typical and highly dependent on the characteristics of the specific RF front end used with the SDR Cube. The Softrock RXTX 6.3 provided standard with the CUBE-SR model has RF specs and/or characteristics published by other parties.


Frequency Coverage:        Depends on specific RF front end electronics installed.

                                          Softrock RXTX 6.3 front end provided in assembled Cubes

                                          External RF front ends may be used for 100 kHz to 2.4 GHz.

                                          Receive:   Multi-Rx Module:  1-30 MHz, full general coverage

                                          Transmit:  TXPA Module 1:     3.5-7.4 MHz (ham bands only)

                                                           TXPA Module 2:   10-15 MHz (ham bands only)

Emission Modes:              CW, USB/LSB, AM               

Frequency Steps:             1 MHz, 100 kHz, 1kHz, 10 Hz

Antenna Impedance:         50 Ohms, Unbalanced

Operating Temp. Range:   -10 to 40 degrees C

Frequency Temp Stability: 50 ppm (w/Si570 Grade A) or 100 ppm (w/DDS)

Frequency Accuracy:        Can be calibrated in software

Supply Voltage:                13.8 VDC, Negative Ground

Operating:                        9.0-18 VDC, Negative Ground

Current Consumption:        Receive: 200 ma (nominal)

                                        Transmit: 440 ma (nominal)

Case Size (W x H x D):     4 x 4 x 4.5

Weight:                            1.5 pounds


Circuit Type:                   Quadrature Sampling Exciter (QSE)

RF Power Output*:          700mw-1W, typical

Modulation Types:           SSB, sin(x)/x-shaped high quality CW

Spurious Radiation*:       -50 dB

Opp. Sideband Supp.*:    -47 dB

SSB Freq Response:       400 Hz 2600 Hz (-6 dB)

Mic Type:                       Electret, or dynamic with external amplifier


Circuit Type:                    Quadrature Sampling Decoder (QSD)

Sensitivity*:                     MDS = -130 dBm

Image Rejection*:             -30 dB

AF Output:                       30 mW, (32 Ohms), ranging from 6 dB to -73 dB

AF Output Impedance:      32 Ohms or higher, headphones or amplified speakers

S-Meter:                          Accurate to 1 dBm, from -110 to -15dBm

                                       Displayable in S-units or as absolute level (dBm)


Keyer:                              1-50 wpm; PTT hold time is proportional to the keyer speed


NOTE:  Specifications are subject to change without notice. Frequency ranges vary according to transceiver software version.




Copyright 2012 Midnight Design Solutions, LLC.  All Rights Reserved.
Page last updated:  February, 2014