SDR Cube Transceiver
Online Assembly Guide
Detailed construction notes for building and testing each of the SDR Cube kit modules
Bill of Materials
RXAMP Multi-Rx X-LPF Internal Cable Set External Cable Set Main Enclosure Accessory Enclosure
Digital Subassembly Test Final Assembly RF Functional Test
|Building the Softrock RXTX Base Board (SR-Base)|
What Is It?
The SDR Cube is designed to interface to any quadrature-based RF front end that provides I/Q baseband audio signals. We use the terms “RF front end” and “RF deck” to mean the electronics that perform the mixing, amplification and filtering of RF signals for an HF radio. The most popular and prolific RF deck around is the Softrock family of small and inexpensive kits. Some 11,000 of these boards in different flavors have been sold around the world already, and each depends on a PC for signal processing and user interface. So by designing the SDR Cube to easily interface with this huge installed base of Softrocks, we provide a way for every Softrock owner to decouple from the complexities of using the PC as a radio, while simultaneously tapping into a ready-made market without needing first to design the RF deck ourselves.
Designator QTY Description C1, C8 2 1000pF ceramic C2, C4, C6, C9, C11, C13, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24, C25, C26, C31 19 10uF 16v C3, C10 2 100pF ceramic C5, C7, C12, C14 4 0.022uF ceramic C27 1 0.033uF ceramic C30, C34 2 0.01uF ceramic C35 1 4.7uF ceramic C32, C33 2 4.7uF ceramic C36, C37 2 0.047uF ceramic C38, C39 2 CAP CER 4700PF 50V C0G RAD C40, C41, C42, C43, C44, C45, C46, C47,C48, C49, C50, C51, C55, C60, C62, C63, C64, C65 18 0.1uF 1206 SMT C52, C53, C54, C56 4 0.01uf 1206 SMT C57, C58, C59, C61 4 0.01uf 1206 SMT D1, D2 2 1N4003 J1 1 4 pin, SIP sockets J2 1 5 pin, SIP sockets J3 1 2 pin, SIP sockets J4 1 3 pin, SIP sockets Q1, Q3, Q4 3 2N3904 Q2 1 2N3906 Q7, Q8 2 BS170 P2 1 2 pin, SIP pinheader, R/A P3, P4 2 2 pin, SIP pinheager P5, P6, P7 3 3 pin, SIP pinheader R1, R2, R4, R5, R7, R8, R10, R11 8 10.0k, 1% R19, R20, R25, R44, R45, R48 6 10.0k, 1% R3, R6, R9, R12, R18, R17 6 49.9, 1% R13, R14, R16, R22 4 2.21k, 1% R15 1 3.32k, 1% R23 1 22.1, 1% R24 1 22.1k, 1% R27 1 22.1k, 1% R51, R52 2 1.00k, 1% R46, R47, R49, R50 4 10.0, 1% R55, R56 2 100, 1/6 W R28 1 221, 1% R21, R29, R30, R53, R54 5 4.99k 1% R26 1 4.99K, 1% U1, U2 2 TLV2462 U3, U10 2 FST3253 U4 1 LM7805 U5 1 LP2992AIMS-3.3V U9 1 74AC74 U11 1 LT6221 U7 1 Si570 RFC-1 1 BN-43-2402, 4T, #26 1 Wire, #26, 6" 1 PCB Hardware Standoffs 4 Spacer, AL, hex tapped, #4, 1/4" (PCB) Screws 8 Machine screw, pan slotted, #4-40x3/16"
Go to the official Softrock RXTX 6.3 Construction web pages by WB5RVZ and build your SR-base by following those instructions ... http://www.wb5rvz.com/sdr/RXTX_V6_3/
(Remember that not all parts shown on that RXTX 6.3 assembly page are used ... only install the parts shown above, as supplied in the SR-Base Kit.
Power and Signal Connectors for the Completed SR-Base Board
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Page last updated: Sept 9 2014