1968 Lafayette-Catalog.Pdf
Total Page：16
File Type：pdf, Size：1020Kb
Load more
Recommended publications
-
Bull Electrical-Jun03.Qxd
Constructional Project PRACTICAL RADIO CIRCUITS RAYMOND HAIGH Part 1: Introduction, Simple Receivers and a Headphone Amp. Dispelling the mysteries of radio. This new series features a variety of practical circuits for the set builder and experimenter. owards the end of the 19th century, physicist who first demonstrated the exis- (V. Poulsen), and by mechanical alterna- sending a radio signal a few hun- tence of electromagnetic waves in 1886. tors (E. Alexanderson). Semiconductors T dred yards was considered a major Before the valve era, radio frequency now play an increasing role, but valves are achievement. At the close of the 20th, man oscillations were generated by using an still used in high-power transmitters. was communicating with space probes at electrical discharge to shock-excite a tuned As their name suggests, the waves com- the outermost edge of the solar system. circuit (H. Hertz and G. Marconi), by the prise an electric and a magnetic field No other area of science and technology negative resistance of an electric arc which are aligned at right angles to one has affected the lives of people another. The electric field is more completely. And because it formed by the rapid voltage fluctu- is so commonplace and afford- ations (oscillations) in the aerial. able, it is accepted without a sec- Current fluctuations create the ond thought. The millions who magnetic field. enjoy it, use it, even those whose lives depend upon it, often have HITCHING A RIDE little more than a vague notion of Electromagnetic waves cannot, A) how it works. by themselves, convey any informa- This series of articles will view tion. -
Lecture 25 Demodulation and the Superheterodyne Receiver EE445-10
EE447 Lecture 6 Lecture 25 Demodulation and the Superheterodyne Receiver EE445-10 HW7;5-4,5-7,5-13a-d,5-23,5-31 Due next Monday, 29th 1 Figure 4–29 Superheterodyne receiver. m(t) 2 Couch, Digital and Analog Communication Systems, Seventh Edition ©2007 Pearson Education, Inc. All rights reserved. 0-13-142492-0 1 EE447 Lecture 6 Synchronous Demodulation s(t) LPF m(t) 2Cos(2πfct) •Only method for DSB-SC, USB-SC, LSB-SC •AM with carrier •Envelope Detection – Input SNR >~10 dB required •Synchronous Detection – (no threshold effect) •Note the 2 on the LO normalizes the output amplitude 3 Figure 4–24 PLL used for coherent detection of AM. 4 Couch, Digital and Analog Communication Systems, Seventh Edition ©2007 Pearson Education, Inc. All rights reserved. 0-13-142492-0 2 EE447 Lecture 6 Envelope Detector C • Ac • (1+ a • m(t)) Where C is a constant C • Ac • a • m(t)) 5 Envelope Detector Distortion Hi Frequency m(t) Slope overload IF Frequency Present in Output signal 6 3 EE447 Lecture 6 Superheterodyne Receiver EE445-09 7 8 4 EE447 Lecture 6 9 Super-Heterodyne AM Receiver 10 5 EE447 Lecture 6 Super-Heterodyne AM Receiver 11 RF Filter • Provides Image Rejection fimage=fLO+fif • Reduces amplitude of interfering signals far from the carrier frequency • Reduces the amount of LO signal that radiates from the Antenna stop 2/22 12 6 EE447 Lecture 6 Figure 4–30 Spectra of signals and transfer function of an RF amplifier in a superheterodyne receiver. 13 Couch, Digital and Analog Communication Systems, Seventh Edition ©2007 Pearson Education, Inc. -
Regenerative Radio Receivers 2/1/16, 7:47 PM
regenerative radio receivers 2/1/16, 7:47 PM WWW.ELECTRONICS-TUTORIALS.COM Recommend 28 Share 28 4 •NEW! ‣ - Amazon Electronic Component Packs. Check out the Amazon Electronic Component Packs page. What are the basics of regenerative radio receivers? Foreword - by Ian C. Purdie VK2TIP A regenerative radio receiver is unsurpassed in comparable simplicity, weak signal reception, inherent noise-limiting and agc action and, freedom from overloading and spurious responses. The regenerative radio receiver or, even super-regenerative radio receiver or, "regen" if you prefer, are basically oscillating detector receivers. They are simple detectors which may be used for cw or ssb when adjusted for oscillation or a-m phone when set just below point of oscillation. In contrast direct conversion receivers use a separate hetrodyne oscillator to produce a signal. In the comprehensive electronic project presented here, Charles Kitchin, N1TEV has provided us with a three stage receiver project which overcomes some of the limitations of this type of receiver, principally the provision of an rf amplifier ahead of the detector. We are indeed particularly grateful to "Chuck" Kitchin, a well noted technical author, for sharing this very valuable material with us to use, learn, experiment and above all, to enjoy. Introduction to the regenerative radio receiver project designed by "Chuck" Kitchin, N1TEV The radio described here is a two band short wave receiver which is both very sensitive and very portable. It receives AM, single sideband (SSB), and CW (code) signals over a frequency range of approximately 3.5 to 12MHz. This includes the 80, 40, and 30 meter Ham bands plus several international short wave bands. -
AM-RX9-433P Superheterodyne Receiver Module
AM-RX9-433P SuperHeterodyne Receiver Module Features Complete RF Receiver CMOS / TTL Output Low Power Consumption 2.6mA (typ) Wide Operating Voltage 2.4 to 5Vdc Applications Wireless Security Systems High sensitivity 110dBm Car Alarms Available as 315 / 433MHz Remote Gate Controls Remote Sensing Data Capture Sensor Reporting General Description The RF Solutions AM Superheterodyne Receivers are compact modules, which can be used to capture undecoded data from any equivalent AM Transmitter The module exhibits extremely stable electronic characteristics with no adjustable compo- nents and very reliable operation. The modules are compatible with R F solutions Ltd. range of AM transmitter to provide a complete Radio Link. Part Number Description AM-RX9-315P AM Receiver Module 315MHz AM-RX9-433P AM Receiver Module 433.92MHz DS-AM-RX9-433P-1 Page 1 AM-RX9-433P Mechanical Data Pin Decriptions Pin Description 1 Antenna In 2, 3, 8 Ground 4, 5 Supply voltage 6,7 Data Output Electrical Characteristics Ambient temp = 25°C unless otherwise stated. Characteristic Min Typical Max Dimensions Supply Voltage 2.4 5 5.5 Vdc Supply Current 2.6 mA RF Sensitivity (Vcc=5V, 1Kbps AM 99% -109 dBm @433MHz Square wave modulation) 315 Working Frequency MHz 433.92 High Level Output 0.7Vcc V Low Level Output 0.3Vcc V IF Bandwidth 280 KHz Data Rate 1 10 Kbps DS-AM-RX9-433P-1 Page 2 AM-RX9-433P Typical Application Vcc 1K 15K 13 14 4 Sleep Vcc 17 RX3 Receiver L Vcc OP1 O/P 1 12 Option 1 2 3 7 11 13 15 Status LKIN 18 LED Link OP2 O/P 2 M 1 OP3 O/P 3 2 OP4 O/P 4 10 3 LRN LB Transmitter RF600D Low Battery 1K 11 Serial Data Learn SD1 Output Switch 9 7 IN ECLK GND 5 22K RF Meter RF Multi Meter is a versatile handheld test meter checking Radio signal strength or interference in a given area. -
Build an Old Time One-Valve Radio T
•~ a.. e e Ifito .ega'3a, . tr Ssc~ . a~:r"..,`'r"'~g~~ t.~.= ~ y~~..i•'`'E~;sr,:~ .?-~`.r ;~'~I:i'Y ~~":'-:2i:5'-~'r:" *: ap~ i d -.t e -•i' e'•,y`. z'a--'~ ~a.r •~`,`'t ,'-yerk',t"3-c .rLt ~`u"r. ,~,`.~f'F' 06***104r"' G: _•ad2r. r,`r,*•r--,.x-00-fti;,s -,yr-4.o o-+J-0,0_4 03-c?'rv7-F * Special `nostalgia' project: BUILD AN OLD TIME ONE-VALVE RADIO T There's a lot of interest nowadays in building simple valve-based radio sets, of the type that were popular from the 1920s right up until the 1960s. Here's the first of two articles which give all the information you'll need to construct an authentic one-valver starting with a basic `grid-leak' set and progressing to a regenerative circuit with surprisingly good performance. Enough information is given to allow you to use almost any old valve or other components to hand. by PETER LAUGHTON Cleaning out my radio `shack' (read had, and how much I'd learned. This, cussion is the following project. mess) the other day, I came across a along with several recent Letters to The circuits described can be built number of radio receivers that I con- the Editor asking for more vintage using almost any combination of com- structed years ago based on valves, radio projects, resulted in me talking ponents, even from junked valve TV and remembered how much fun I'd to Jim Rowe, and the result of that dis- sets. -
Superheterodyne Receiver
Superheterodyne Receiver The received RF-signals must transformed in a videosignal to get the wanted informations from the echoes. This transformation is made by a super heterodyne receiver. The main components of the typical superheterodyne receiver are shown on the following picture: Figure 1: Block diagram of a Superheterodyne The superheterodyne receiver changes the rf frequency into an easier to process lower IF- frequency. This IF- frequency will be amplified and demodulated to get a videosignal. The Figure shows a block diagram of a typical superheterodyne receiver. The RF-carrier comes in from the antenna and is applied to a filter. The output of the filter are only the frequencies of the desired frequency-band. These frequencies are applied to the mixer stage. The mixer also receives an input from the local oscillator. These two signals are beat together to obtain the IF through the process of heterodyning. There is a fixed difference in frequency between the local oscillator and the rf-signal at all times by tuning the local oscillator. This difference in frequency is the IF. this fixed difference an ganged tuning ensures a constant IF over the frequency range of the receiver. The IF-carrier is applied to the IF-amplifier. The amplified IF is then sent to the detector. The output of the detector is the video component of the input signal. Image-frequency Filter A low-noise RF amplifier stage ahead of the converter stage provides enough selectivity to reduce the image-frequency response by rejecting these unwanted signals and adds to the sensitivity of the receiver. -
A Fully Integrated CMOS Receiver by Dan Shi a Dissertation Submitted in Partial Fulfillment of the Requirements for the Degree O
A Fully Integrated CMOS Receiver by Dan Shi A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy (Electrical Engineering) in The University of Michigan 2008 Doctoral Committee: Associate Professor Michael P. Flynn, Co-Chair Emeritus Research Scientist Jack R. East, Co-Chair Professor John P. Hayes Professor Amir Mortazawi Dan Shi © 2008 All Rights Reserved to my mom, dad, my sister and my wife… ii ACKNOWLEDGMENTS I would never have been able to finish my dissertation without the guidance of my committee members, the help from friends, and the support from my family and my wife. First, I would like to express my most sincere appreciation to my advisor, Dr. Michael P. Flynn, for instilling in me the qualities of being a good graduate student. His infectious enthusiasm and unlimited zeal have been major driving forces through my graduate career at The University of Michigan. Throughout my doctoral work he encouraged me to develop independent thinking and research skills. And I am particularly grateful for the advice, both technical and personal, that he has given me over the years. I would also like to thank my co-advisor, Dr. Jack R. East. Without his and Professor George I. Haddad’s continuous support, I would never be writing these lines. I would also like to thank the rest of my committee members: Professor Amir Mortazawi and Professor John P. Hayes for their invaluable feedback during my research. I would like to acknowledge Professor Kamal Sarabandi for his support of this research and for providing help during the final testing. -
Man of High Fidelity
Man of High Fidelity: EDWIN HOWARD ARMSTRONG A Biography – By Lawrence Lessing With a new forward by the author Page iii Pratt DISCLAIMER DISCLAIMER TO THIS SCANNED AND OCR PROCESSED COPY This PDF COPY is for use at Pratt Institute for Educational Purposes Only I affirm that sufficient print copies of the original Bantam Book Paperback are in stock in ARC E-08 that would more than adequately cover a full class use of the text. HOWEVER, due to the fact that the 1969 text is no longer in publication, complicated by the fact that these copies are forty-four (44) years old and in a very fragile condition, this PDF version of the text was created for student use in the Department of Mathematics and Science. - Professor Charles Rubenstein, January 2013 Man of High Fidelity: Edwin Howard Armstrong EDWIN HOWARD ARMSTRONG Was the last – and perhaps the least known – of the great American Inventors. Without his major contributions, the broadcasting industry would not be what it is today, and there would be no FM radio. But in time of mushrooming industry and mammoth corporations, the recognition of individual genius is often refused, and always minimized. This is the extraordinary true story of the discovery of high fidelity, the brilliant man and his devoted wife who battled against tremendous odds to have it adopted, and their long fight against the corporations that challenged their right to the credit and rewards. Mrs. Armstrong finally ensured that right nearly ten years after her husband’s death. Page i Cataloging Information Page This low-priced Bantam Book has been completely reset in a type face designed for easy reading, and was printed from new plates. -
CX74017 on the Direct Conversion Receiver
CX74017 On the Direct Conversion Receiver architectures, this paper presents the direct conversion Abstract reception technique and highlights some of the system-level issues associated with DCR. Increased pressure for low power, small form factor, low cost, and reduced bill of materials in such radio applications as mobile communications has driven academia and industry to resurrect Traditional Reception Techniques the Direct Conversion Receiver (DCR). Long abandoned in favor of the mature superheterodyne receiver, direct conversion has The Superheterodyne emerged over the last decade or so thanks to improved semiconductor process technologies and astute design The superheterodyne, or more generally heterodyne1, receiver techniques. This paper describes the characteristics of the DCR is the most widely used reception technique. This technique and the issues it raises. finds numerous applications from personal communication devices to radio and TV tuners, and has been tried inside out Introduction and is therefore well understood. It comes in a variety of combinations [7-9], but essentially relies on the same idea: the Very much like its well-established superheterodyne receiver RF signal is first amplified in a frequency selective low-noise counterpart, introduced in 1918 by Armstrong [1], the origins of stage, then translated to a lower intermediate frequency (IF), the DCR date back to the first half of last century when a single with significant amplification and additional filtering, and finally down-conversion receiver was first described by F.M. Colebrook downconverted to baseband either with a phase discriminatory in 1924 [2], and the term homodyne was applied. Additional or straight mixer, depending on the modulation format. -
Variable Capacitors in RF Circuits
Source: Secrets of RF Circuit Design 1 CHAPTER Introduction to RF electronics Radio-frequency (RF) electronics differ from other electronics because the higher frequencies make some circuit operation a little hard to understand. Stray capacitance and stray inductance afflict these circuits. Stray capacitance is the capacitance that exists between conductors of the circuit, between conductors or components and ground, or between components. Stray inductance is the normal in- ductance of the conductors that connect components, as well as internal component inductances. These stray parameters are not usually important at dc and low ac frequencies, but as the frequency increases, they become a much larger proportion of the total. In some older very high frequency (VHF) TV tuners and VHF communi- cations receiver front ends, the stray capacitances were sufficiently large to tune the circuits, so no actual discrete tuning capacitors were needed. Also, skin effect exists at RF. The term skin effect refers to the fact that ac flows only on the outside portion of the conductor, while dc flows through the entire con- ductor. As frequency increases, skin effect produces a smaller zone of conduction and a correspondingly higher value of ac resistance compared with dc resistance. Another problem with RF circuits is that the signals find it easier to radiate both from the circuit and within the circuit. Thus, coupling effects between elements of the circuit, between the circuit and its environment, and from the environment to the circuit become a lot more critical at RF. Interference and other strange effects are found at RF that are missing in dc circuits and are negligible in most low- frequency ac circuits. -
Redalyc.Software Defined Radio: Basic Principles and Applications
Facultad de Ingeniería ISSN: 0121-1129 [email protected] Universidad Pedagógica y Tecnológica de Colombia Colombia Machado-Fernández, José Raúl Software Defined Radio: Basic Principles and Applications Facultad de Ingeniería, vol. 24, núm. 38, enero-junio, 2015, pp. 79-96 Universidad Pedagógica y Tecnológica de Colombia Tunja, Colombia Available in: http://www.redalyc.org/articulo.oa?id=413940775007 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative José Raúl Machado-Fernández ISSN 0121-1129 eISSN 2357-5328 Software Defined Radio: Basic Principles and Applications Software Defined Radio: Principios y aplicaciones básicas Software Defined Radio: Princípios e Aplicações básicas Fecha de Recepción: 29 de Septiembre de 2014 José Raúl Machado-Fernández* Fecha de Aceptación: 15 de Noviembre de 2014 Abstract The author makes a review of the SDR (Software Defined Radio) technology, including hardware schemes and application fields. A low performance device is presented and several tests are executed with it using free software. With the acquired experience, SDR employment opportunities are identified for low-cost solutions that can solve significant problems. In addition, a list of the most important frameworks related to the technology developed in the last years is offered, recommending the use of three of them. Keywords: Software Defined Radio (SDR), radiofrequencies receiver, radiofrequencies transmitter, radio development frameworks, superheterodyne receiver, SDR hardware devices, SDR-Sharp, RTLSDR-Scanner. Resumen El autor realiza una revisión de la tecnología Radio Definido por Software (SDR, Software Defined Radio) incluyendo esquemas de hardware y campos de aplicación. -
5 RCA 26 Receiver
5 RCA 26 receiver- portables was not particularly difficult at the time. By contrast, designing a workable superheterodyne receiver wasn't particularly easy in 1925, as the valves that were then available were not very suitable for the task of frequency conversion. In fact, the design could be quite critical if the set was to operate at all. That situation improved in the early 1930s with the development of the. 2A7 and similar converter type valves. These new valves proved to be quite tolerant of circuit design inadequacies, making the design and manufacture of superhet receivers much easier. ..^. Superhet principles The RCA 26 portable superhet receiver Before the 1930s, most sets em- with its front open, ready for use. ployed TRF (tuned radio frequency) circuits. However, these had their shortcomings and superhet designs Prior to the 1930s, virtually all domestic quickly took over when suitable valves broadcast receivers used TRF circuits. became available. The superhet (or superheterodyne) One exception was the 1925 RCA 26 principle was developed during World portable which was one of the very first War 1 by Major Edwin Armstrong of the US Army. Armstrong was a prolific domestic superhets. It used some truly radio inventor who also developed innovative technology for the era. other radio techniques, including regeneration, super regeneration and frequency modulation (FM). Basically, the sup erhet was devel- NTIL RECENTLY, I'd always Why was this so remarkable? Well, oped because during WW1, the allies Uthought that "portable" radios superheterodyne receivers didn't be- needed direction finding (DF) receiv- (if you could call them that) were an come common in Australia until the ers that could receive the extremely innovation of the mid to late 1930s.