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1900 kaklik 1 \documentclass[12pt,a4paper,oneside]{article}
2 \usepackage[colorlinks=true]{hyperref}
3 \usepackage[utf8]{inputenc}
4 \usepackage[english]{babel}
5 \usepackage{graphicx}
6 \usepackage{pdfpages}
7 \textwidth 16cm \textheight 25cm
8 \topmargin -1.3cm
9 \oddsidemargin 0cm
10 \pagestyle{empty}
11 \begin{document}
12 \title{Software Defined Receiver SDRX01B not only for radioastronomy}
13 \author{Jakub Kákona, kaklik@mlab.cz }
14 \maketitle
15  
16 \begin{abstract}
1902 kaklik 17 This paper describe a design of Software Defined Receiver suitable for radioastronomy purposes. The receiver which has been developed in this project replacing the old analog construction such as RadioJOVE and others.
1900 kaklik 18 \end{abstract}
19  
20 \begin{figure} [htbp]
21 \begin{center}
22 \includegraphics [width=80mm] {SDRX01B_Top_Big.JPG}
23 \end{center}
24 \end{figure}
25  
26 \tableofcontents
27  
28 \section{Technical parameters}
29 \begin{table}[htbp]
30 \begin{center}
31 \begin{tabular}{|c|c|p{5cm}|}
32 \hline
33 \multicolumn{1}{|c|}{Parameter} & \multicolumn{1}{|c|}{Value} & \multicolumn{1}{|c|}{Note} \\ \hline
34 Powering voltage for analogue part & $\pm$10V & 100mA \\ \hline
35 Powering voltage for digital part & +5V & 300mA \\ \hline
36 Bias of optional LNA & up to +20V & max 500mA \\ \hline
37 Frequency range & 0,5 - 200 MHz & With populating by chosen parts even up 450MHz \\ \hline
38 IIP3 & $>$ 0dB & Preliminary \\ \hline
39 Gain & 40-60dB & Selectable by jumper \\ \hline
40 Self noise number & $<$ 30dB & \\ \hline
41 \end{tabular}
42 \end{center}
43 \end{table}
44  
45 \newpage
46 \section{Description of construction}
47  
48 \subsection{Circuit}
1902 kaklik 49 Construction of the receiver is delivered from the DR2G receiver \cite{DR2G} which uses CMOS components completely. The main change in this construction is a local oscillator input circuit which allow to receiver work at higher frequencies, because this construction do not divide the input frequency by 4, such as original construction but only by 2. In addition there was be replaced switches in the sampling mixer by faster type and board layout was optimized for higher frequencies and better noise rejection.
1900 kaklik 50  
51 \includepdf[pages={1,2,3,4},landscape=true]{../../SCH/sdrx.pdf}
52  
1902 kaklik 53 The necessary part of the receiver is a Local Oscillator (LO), which must be connected to receiver via SATA cable. The LO may be a CLKGEN01B module populated by the 570ABB000107DG chip. SATA cable should be as short as possible to minimize ground loops.
1900 kaklik 54  
1902 kaklik 55 \includepdf[pages={1},landscape=true]{../../CAM_DOC/O1.pdf}
56  
57 \includepdf[pages={1},landscape=true]{../../CAM_DOC/O2.pdf}
58  
1900 kaklik 59 \subsection{EMI suppression}
60 For proper function of receiver is necessary to use proper low noise symmetric power supply (classical PC power supply is unacceptable). There is need for proper routing of grounding wires, which must be routed in star topology. In addition there is few jumpers on the board of receiver to allow proper selection of ground connection.
61  
62 \subsection{Mechanical construction}
63  
1902 kaklik 64 The mechanical construction of the receiver resulted (For better EMI suppression is suggested use of metal MLAB base such as ALBASE). Two layer PCB is chosen mainly because of better shielding by top cooper layer and even because better grounding. In case where long term stability is required receiver must be inserted to thermostatic box together with LO.
1900 kaklik 65  
66 \subsubsection{Setting}
67 There is one easy step for proper setting of the receiver. The trimmer P1 must be tunned to value where the strength of mirror frequencies is minimized or zero. This can be achieved by tunning the receiver to some strength AM transmitter and slowly turning by P1 until the mirror of signal in frequency spectrum is minimized.
68  
69 \section{Software tools}
70  
71 The basic software tools for this receiver are all programs designed to work with sound card as I/Q input. Such as Winrad, WinradHD or Spectrum Lab. There is usually request to add a LO library for tunning Si570, but tunning the LO by separate software is acceptable too.
72  
73 \begin{thebibliography}{99}
74 \bibitem{DR2G}{The original construction of DR2G}
75 \href{http://yu1lm.qrpradio.com/SMT SDR RX DR2G-YU1LM.pdf}{http://yu1lm.qrpradio.com/SMT SDR RX DR2G-YU1LM.pdf}
76  
77 \end{thebibliography}
78 \end{document}