Buy Basic NEC with Broadcast Applications at Bookstore UAE
Book 1
Book 2
Book 3
Book 1
Book 2
Book 3
Book 1
Book 2
Book 3
Book 1
Book 2
Book 3
Home > Science, Technology & Agriculture > Electronics and communications engineering > Communications engineering / telecommunications > Basic NEC with Broadcast Applications
Basic NEC with Broadcast Applications

Basic NEC with Broadcast Applications


     0     
5
4
3
2
1



Out of Stock


Notify me when this book is in stock
X
About the Book

Basic NEC with Broadcast Applications addresses computer modeling of MF directional broadcast antennas and illustrates the assets and liabilities of the Numerical Electromagnetic Code (NEC). The book's "how to" approach reveals the fundamentals of NEC operation, teaches broadcast applications and shows the reader how to use NEC-2 to: model non-radiating networks, verify calculations, detune unused towers, design top-loaded and skirted antennas, minimize coding by moving and duplicating structures, and much more! Complete with CD, the book is an invaluable toolkit with software necessary for the design and analysis of broadcast antenna arrays.

Table of Contents:
Chapter 1 - The Array Adjustment Process (11pp) This chapter uses the concept of local and global minima to explain why the results of NEC2 computer modeling need not be exact to be beneficial. It also gives a preview of the analysis process. 1.1 The Nature of NEC2 1.2 The Directional Antenna Adjustment Process 1.3 Local and Global Minima 1.4 The Role of NEC2 1.5 Analysis Overview 1.6 Additional NEC2 Benefits 1.7 Software Requirements Chapter 2 ? NEC2 Fundamentals (27pp) This chapter covers the basic use of NEC2. It teaches how to write the input file, the types of input files, naming conventions, how to run bnec.exe and how to read and interpret the output file. 2.1 The NEC2 Engine 2.2 NEC2 Operation 2.3 Creating the Input File 2.3.1 Naming the files 2.3.2 Data Commands 2.3.3 Data Command Types 2.3.4 An Input File Illustration 2.3.5 Comment Commands 2.3.6 Geometry Commands 2.3.7 Program Control Commands 2.4 Reading the Output File 2.4.1 The Header 2.4.2 Structure Specification 2.4.3 Segmentation Data 2.4.4 Data Lines, Frequency, Loading and Environment Data 2.4.5 Antenna Input Parameters 2.4.6 Currents and Locations 2.4.7 Current Moments 2.4.8 Power Budget 2.4.9 Radiation Pattern 2.5 Exercise 2 Chapter 3 - Modeling the Radiator (20pp) This chapter covers the various NEC2 model configurations that can be used to represent the radiating tower, the rules that apply to modeling and exciting the tower. It also introduces a viewing program to verify tower coding. 3.1 Modeling Guidelines 3.2 Guideline Summary 3.2.1 Modeling the Radiator 3.2.2 Modeling the Voltage Source 3.3 Tower Configurations 3.3.1 Single Wire Configuration 3.3.2 4-wire Configuration 3.3.3 2-wire Configuration 3.3.4 Lattice Configuration 3.3.4.1 Coding the Lattice Configuration 3.3.4.2 Simplified Lattice Model 3.4 Viewing the Tower Configuration 3.5 Exercise 3 Chapter 4 ? Array Geometry (15pp) This chapter converts the coordinate system used by NEC2 to a system consistent with the coordinate system normally used by the broadcast community. In addition it teaches how a multi-tower array is modelled and establishes a notation for multi-tower arrays. 4.1 The Coordinate System 4.2 Array Geometry ? An Example 4.3 The Array Input File 4.4 Exercise 4 Chapter 5 ? Loads, Networks and Transmission Lines (15pp) This chapter tells how to create a lumped impedance load in a NEC2 wire segment. It also shows how to use non-radiating networks in NEC2 and how to calculate the Y-parameters for those networks plus it shows typical uses for networks. A similar treatment is given for transmission lines. 5.1 Modeling Impedance Loads 5.2 Modeling non-radiating networks 5.2.1 Typical Networks 5.2.2 Typical Network Applications 5.2.3 General Guidelines for Networks 5.3 Modeling Transmission Lines 5.4 Network Output File Listing 5.4.1 Network Description 5.4.2 Network Source and Load Impedance 5.4.3 Network Input Parameters 5.5 Exercise 5 Chapter 6 ? Calculating Base Drive Voltages (25pp) This chapter teaches how to use post processing software to convert the broadcaster's field ratios to NEC2's base drive voltages to initiate the computer modeling process. 6.1 Direct and Induced Currents 6.2 Current Moments 6.3 The Development Concept 6.3.1 Normalized Drive 6.3.2 Full Power Drive 6.3.3 Shunt Reactance and Networks 6.4 Example ? A Three Tower Array 6.4.1 Create a Unity Drive File 6.4.2 Calculate Unity Current Moments 6.4.2.1 Tower #1 Moments 6.4.2.2 Tower #2 Moments 6.4 2 3 Tower #3 Moments 6.4.3 Solve for Normalized drive Voltages 6.4.4 Determine Full Power drive Voltages 6.5 Exercise 6 Chapter 7 ? Applying the Output File Data (24pp) This chapter shows how to translate the information in the NEC2 output file to useful design parameters. It teaches how to confirm the validity of the calculations and how to apply the results. It also shows how to use the output file data to set the start-up parameters for a new array. 7.0 Overview 7.1 Verify the Field Ratio 7.2 Plot Far Field Radiation Pattern 7.3 Detune Unused Towers 7.3.1 Detuning by Base Loadiung 7.3.1.1 Example ? Detuning by Base Loading 7.3.1.2 Base Loading Input File Listing 7.3.2 Detuning by Skirting 7.3.2.1 Example ? Detuning by Skirting 7.3.2.2 Input File Listing ? Detuning by Skirting 7.4 Antenna Monitor Readings 7.4.1 Optimum Height for Sample Loops 7.4.2 Arbitrary Height for Sample Loops 7.4.3 Base Current Samples 7.5 Drive Point Impedance 7.5.1 Drive Point Impedance When Using a Network 7.6 Exercise 7 Chapter 8 - Model by Measurement (10pp) This chapter helps the reader match the self impedance of a tower as calculated by NEC2 to a measured reference by showing how changes in the various tower parameters tend to influence the calculated self impedance. 8.1 Objective 8.2 Adjusting the Model 8.2.1 Number of segments 8.2.2 Tower Diameter 8.2.3 Segment and Radius Taper 8.2.4 Base Capacity 8.2.5 Drive Segment Radius 8.3 Exercise 8 Chapter 9 ? Top Loaded and Skirted Towers (13pp) This chapter applies NEC2 to the design and use of a tower skirt when applied to top loading, current distribution control and folded monopole applications. 9.0 General Considerations 9.1 Top Loading 9.1.1 Estimating the Size of a Top Hat 9.1.2 Determining the Degree of Top Loading 9.2 Skirted Towers 9.3 Folded Monopoles Chapter 10 ? System Bandwidth Analysis (18pp) This chapter extends the application of NEC2 to include the system networks. The methods described view the various functional interfaces within the signal path and displays their impedance bandwidth characteristics. 10.1 Introduction 10.2 System definition 10.2.1 Tower Models 10.2.2 Tower Base Drive Voltages 10.3 Bandwidth Analysis 10.3.1 Source Impedance of the Drive Voltage 10.3.2 Intermediate Data 10.3.2.1 Procedure for Calculating Intermediate Data 10.3.2.2 Tower Base Impedance 10.3.2.3 ATU Input Impedance 10.3.2.4 Transmission Line Input Impedance 10.3.2.5 Phasing Network Input Impedance 10.3 2.6 Power Divider Input Impedance 10.3.3 Total System Bandwidth 10.3.3.1 The Common Point Network 10.3.3.2 Radiation Bandwidth 10.4 Bandwidth Conclusions Chapter 11 ? Case Studies (24pp) This chapter is used to show the assets and liabilities of a NEC2 analysis. It uses measured data to confirm that the results of a NEC2 analysis need not be exact to be beneficial. 11.0 Comparative Data 11.1 Case Study #1 3-tower Array 11.1.1 Array description 3-tower Array 11.1.2 Self Impedance 3-tower Array 11.1.3 Antenna Monitor Reading 3-tower Array 11.1.4 Array Data 3-tower Array 11.1.5 Discussion 3-tower Array 11.1.6 Nec2 Input File 3-tower Array 11.2 Case Study #2 6-tower Array 11.2.1 Array description 6-tower Array 11.2.2 Self Impedance 6-tower Array 11.2.3 Antenna Monitor Reading 6-tower Array 11.2.4 Array Data 6-tower Array 11.2.5 Discussion 6-tower Array 11.2.6 Nec2 Input File 6-tower Array 11.3 Case Study #3 6-tower Array Night Time 11.3.1 Array description 6-tower Array Night Time 11.3.2 Self Impedance 6-tower Array Night Time 11.3.3 Antenna Monitor Reading 6-tower Array Night Time 11.3.4 Array Data 6-tower Array Night Time 11.3.5 Discussion 6-tower Array Night Time 11.3.6 Nec2 Input File 6-tower Array Night Time 11.4 Case Study #4 Tall Tower Array 11.4.1 Array description Tall Tower 11.4.2 Self Impedance Tall Tower 11.4.3 Antenna Monitor Reading Tall Tower 11.4.4 Array Data Tall Tower 11.4.5 Discussion Tall Tower 11.4.6 Nec2 Input File Tall Tower Chapter 12 ? Supplemental Topics (16pp) This chapter adds a few topics that may not be absolutely necessary but in any event they are interesting and add some insight into the analysis. Moreover, they are topics that are not well documented elsewhere thus their presentation here fulfils an existing need. 12.0 Introduction 12.1 Parallel Feeds ? Network Combiners 12.2 New Structures ? The NX Command 12.3 Numerical Green's Function 12.4 Ground Screens 12.4.1 The GN Command 12.4.2 The GR Command 12.5 Finite Ground 12.5.1 Reflection Coefficient Approximation 12.5.2 Sommerfeld/Norton Procedure Appendix A ? NEC2 Input File Statements (71pp) This appendix is a full listing of all the NEC2 command statements and serves as a valuable reference to the beginner and professional alike. Appendix B ? Error Messages (9pp) This appendix references error number versus an explanation of the error along with suggestions for remedy. Appendix C - Software (11pp) This appendix is essentially a user's manual for the software included on the associated disc. It includes instructions for the NEC2 program (bnec.exe), the geometry viewing program (NVCOMP.exe), the pattern plotting program (WJGRAPS.EXE), the

About the Author :
J.L. Smith holds a B.S. in Physics from the University of Houston and an M.S. in Engineering from Southern Methodist University. Through his career, Mr. Smith held the usual positions in research and development beginning his career at KTRH in Houston, Texas in 1946, joining Collins Radio Company in 1956 where he was Department Head, Research and Development, then Manager, Broadcast Systems Engineering. Mr. Smith has been active in FCC matters having filed the first petition advocating automatic unattended operation of FM broadcast transmitters. He participated in the coordination of international broadcasting through his service on CCIR Study Group 10, authored over 50 technical papers and has published Basic Mathematics with Electronics Applications (Macmillan Company 1972) and (Interference Control Technologies 1993.) J.L. Smith is now retired in Covington, LA where he devotes much of his time to analytical research pertaining to AM directional antennas.


Best Sellers


Product Details
  • ISBN-13: 9780240522807
  • Publisher: Focal Press
  • Publisher Imprint: Focal Press
  • Language: English
  • No of Pages: 304
  • ISBN-10: 024052280X
  • Publisher Date: 04 Apr 2008
  • Binding: Paperback
  • No of Pages: 304
  • Returnable: N


Similar Products

Add Photo
Add Photo

Customer Reviews

REVIEWS      0     
Click Here To Be The First to Review this Product
Basic NEC with Broadcast Applications
Focal Press -
Basic NEC with Broadcast Applications
Writing guidlines
We want to publish your review, so please:
  • keep your review on the product. Review's that defame author's character will be rejected.
  • Keep your review focused on the product.
  • Avoid writing about customer service. contact us instead if you have issue requiring immediate attention.
  • Refrain from mentioning competitors or the specific price you paid for the product.
  • Do not include any personally identifiable information, such as full names.

Basic NEC with Broadcast Applications

Required fields are marked with *

Review Title*
Review
    Add Photo Add up to 6 photos
    Would you recommend this product to a friend?
    Tag this Book Read more
    Does your review contain spoilers?
    What type of reader best describes you?
    I agree to the terms & conditions
    You may receive emails regarding this submission. Any emails will include the ability to opt-out of future communications.

    CUSTOMER RATINGS AND REVIEWS AND QUESTIONS AND ANSWERS TERMS OF USE

    These Terms of Use govern your conduct associated with the Customer Ratings and Reviews and/or Questions and Answers service offered by Bookswagon (the "CRR Service").


    By submitting any content to Bookswagon, you guarantee that:
    • You are the sole author and owner of the intellectual property rights in the content;
    • All "moral rights" that you may have in such content have been voluntarily waived by you;
    • All content that you post is accurate;
    • You are at least 13 years old;
    • Use of the content you supply does not violate these Terms of Use and will not cause injury to any person or entity.
    You further agree that you may not submit any content:
    • That is known by you to be false, inaccurate or misleading;
    • That infringes any third party's copyright, patent, trademark, trade secret or other proprietary rights or rights of publicity or privacy;
    • That violates any law, statute, ordinance or regulation (including, but not limited to, those governing, consumer protection, unfair competition, anti-discrimination or false advertising);
    • That is, or may reasonably be considered to be, defamatory, libelous, hateful, racially or religiously biased or offensive, unlawfully threatening or unlawfully harassing to any individual, partnership or corporation;
    • For which you were compensated or granted any consideration by any unapproved third party;
    • That includes any information that references other websites, addresses, email addresses, contact information or phone numbers;
    • That contains any computer viruses, worms or other potentially damaging computer programs or files.
    You agree to indemnify and hold Bookswagon (and its officers, directors, agents, subsidiaries, joint ventures, employees and third-party service providers, including but not limited to Bazaarvoice, Inc.), harmless from all claims, demands, and damages (actual and consequential) of every kind and nature, known and unknown including reasonable attorneys' fees, arising out of a breach of your representations and warranties set forth above, or your violation of any law or the rights of a third party.


    For any content that you submit, you grant Bookswagon a perpetual, irrevocable, royalty-free, transferable right and license to use, copy, modify, delete in its entirety, adapt, publish, translate, create derivative works from and/or sell, transfer, and/or distribute such content and/or incorporate such content into any form, medium or technology throughout the world without compensation to you. Additionally,  Bookswagon may transfer or share any personal information that you submit with its third-party service providers, including but not limited to Bazaarvoice, Inc. in accordance with  Privacy Policy


    All content that you submit may be used at Bookswagon's sole discretion. Bookswagon reserves the right to change, condense, withhold publication, remove or delete any content on Bookswagon's website that Bookswagon deems, in its sole discretion, to violate the content guidelines or any other provision of these Terms of Use.  Bookswagon does not guarantee that you will have any recourse through Bookswagon to edit or delete any content you have submitted. Ratings and written comments are generally posted within two to four business days. However, Bookswagon reserves the right to remove or to refuse to post any submission to the extent authorized by law. You acknowledge that you, not Bookswagon, are responsible for the contents of your submission. None of the content that you submit shall be subject to any obligation of confidence on the part of Bookswagon, its agents, subsidiaries, affiliates, partners or third party service providers (including but not limited to Bazaarvoice, Inc.)and their respective directors, officers and employees.

    Accept

    Fresh on the Shelf


    Inspired by your browsing history


    Your review has been submitted!

    You've already reviewed this product!