Technical Notebook

This page includes general information about my personal studies and contains no confidential information about the products and intellectual property of SDT AŞ.

I am trying to improve myself on electronic warfare and communications for my work, in addition to RF and antennas. I spend my free time at the office to study related topics. It is nice to cooperate while studying with my officemates who are experienced engineers.

I will share some sources and my notes in this page which has valuable information for me. This way, I will not only share them with you but also motivate myself to dig different sources and study them neatly.

 

  • Practical Communication Theory by Dave Adamy

This book is written by David Adamy, who also has books on electronic warfare systems. In the first pages of this book, you can understand that he has written this book from the viewpoint of an electronic warfare systems engineer. Book has simple explanations and solutions for  the real-life problems. It is possible to find information on the all aspects of telecommunication links; transmitters, receivers, antennas, link budget analysis, amplifiers, engineering terms etc.

Link: http://digital-library.theiet.org/content/books/ew/sbew516e

 

  • Introduction to Communication Electronic Warfare Systems by Richard Poisel

I have started to read this book after Mehmet suggested. It is an easy to read and perfectly organized book. A review of this book written by P. Eskelinen can be read from this link: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1145734&isnumber=25793

After reading the book of Adamy, this is a great choice! The intended audition of this book is again rookie EW engineers (as well as military professionals).

Link: http://us.artechhouse.com/Introduction-to-Communication-Electronic-Warfare-Systems-Second-Edition-P1216.aspx

This book made me curious about the writer, Richard Poisel. I have also found a book written by him named Antenna Systems & Electronic Warfare Applications, which looks like a book perfectly fits my interests. I will look to that book when I have time.

 

  • GNU Octave

GNU Octave is a scientific programming language that is pretty similar to Matlab. Matlab is not available in all computers, because of the licensing issues. GNU Octave is a very good alternative to it. The abilities of GNU Octave can be improved by using GNUplot and packages at Octave-Forge. These packages are like the toolboxes of Matlab.

Links:

GNU Octave https://www.gnu.org/software/octave/

Octave-Forge https://octave.sourceforge.io/

GNUplot http://www.gnuplot.info/

 

  • Adcock/Watson-Watt Radio Direction Finding

To learn this method, I’ve started to look to the book “Electronic Warfare Receivers and Receiving Systems” by Poisel, then, I wanted to see a practical implementation example on internet. At the end, I’ve found a perfect page describing the method and including the simulations on 4nec2. This website also gives information on different topics.

Link: http://www.ipellejero.es/tecnico/adcock/english.php

 

  • Broadband Patch Antenna With Omni-Directional Pattern

Let’s say you need an omni-directional pattern, but don’t have enough volume for a vertical or the bandwidth requirement is very high. Try the design in the article below (I’ve simulated and it works!).

Link: A Broadband Center-Fed Circular Patch-Ring Antenna With a Monopole Like Radiation Pattern

 

  • MUSIC Algorithm

I wanted to learn how MUSIC algorithm works. Started with the original paper by Schmidt, but unfortunately, I didn’t understand clearly. After the original paper, I’ve looked to the books and other articles, the most succesful one is given below:

Link: Optimization of MUSIC algorithm for angle of arrival estimation in wireless communications

Tried writing a MATLAB code. First, I’ve used toolboxes, then continued by replacing the toolbox functions by my equations learned from articles. I am very close to the finish, I will have the code without any toolbox functions soon.

Update after some months: Mission complete!

 

  • Radio Direction Finding – An Amateur’s Page

Some amateurs are interested in radio direction finding, mostly using Watson-Watt or Doppler DF systems.

I’ve found the page of PA8W, he is an amateur from Netherlands. His site is fantastic! He gives all the details of his Doppler DF systems.

Link: http://members.chello.nl/~w.hofman/pa8w/rdf.htm

 

  • FCC Body Tissue Dielectric Parameters

Antennas interfere with human body, and designers should take this into account. Both the human health and the antenna health 🙂 is influenced by this interference. To make calculations and simulations, dielectric parameters of different types of human tissue is required. FCC gives a reference up to 6GHz.

Link: https://www.fcc.gov/general/body-tissue-dielectric-parameters

 

  • GPS Data Interpretation

In the field tests, it’s important to determine the locations of the TX and RX stations. Let’s say we have the GPS data, but how to interpret the numbers? Check the link below which tells the mathematical interpretations. It also includes online calculators.

Link: https://www.movable-type.co.uk/scripts/latlong.html

 

  • TTD Circuit

In EE5290 Microwave Circuit Design course, I designed a microstrip TTD circuit as the term project. This sounds very easy, but the work was valuable; in which I have used AWR for the first time. Now it feels comfortable to use it after completing the circuit!

  • Marki Mixer Primer

You need a quick introduction to mixers? Check this whitepaper! It has fundamentals and success measures of mixers.

Link: https://www.markimicrowave.com/assets/appnotes/mixer_basics_primer.PDF

 

  • Amplifier DC Biasing

This short article of Microwave Journal introduces the fundamentals of amplifier DC biasing. It is extremely simplified, and it was very valuable when I first tried to learn the topic.

Link: http://www.microwavejournal.com/articles/print/3086-the-abcs-of-device-biasing

For deeper info, the book of S. Cripps, RF Power Amplifiers for Wireless Communications is valuable.

Link: http://us.artechhouse.com/RF-Power-Amplifiers-for-Wireless-Communications-Second-Edition-P1820.aspx

 

  • Investigation of Radio-Astronomy Antenna

TAMSAT members are working on the renovation of historical radio-telescope at the Ankara University Kreiken Observatory. Here is the link for the first report of the study.

Report is written in turkish.

Link: https://qsl.net/ta2otd/kreiken_inceleme.pdf

 

  • AMSAT – Jan King’s Spreadsheets

The link below includes many MS Excel spreadsheets for amateur satellite works.

Link: http://www.amsatuk.me.uk/iaru/spreadsheet.htm

 

  • Antenna Trapping

In the following links, W4RNL Cebik shared some notes on antenna traps.

Link 1: http://www.antentop.org/w4rnl.001/trap.html

Link 2: http://www.antentop.org/w4rnl.001/traps.html

Link 3: http://www.antentop.org/w4rnl.001/trapg.html

Link 4: http://www.antentop.org/w4rnl.001/trapqq.html

 

  • Amos and Quados Antennas

Franklin Dipole is a very good practical and high gain omni antenna. To further increase the gain (but only in the semi-spherical area) is to put a reflector behing it. While I was thinking this design, I’ve found that an amateur from Serbia, YU1AW, studied on this design and named it as Amos Antenna. One can also use a Biquad (or Multiquad) Antenna in front of the reflector; to get the polarization in the other direction. This design is named as Quados by YU1AW.

Amos Antenna: https://www.qsl.net/yu1aw/ANT_VHF/Amos_Ant/amos_antennas.htm

Quados Antenna: https://www.qsl.net/yu1aw/ANT_VHF/quados_antennas.htm