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Provides a list of important bookmarks on folked.com on various subjects including certification, practice tests, tutorials, and web design and development.

ISO Open Systems Interconnection (OSI) model is one of the most widely read about topic in the area of systems connectivity. The OSI layer consists of 7 layers, viz Application, Presentation, Session, Transport, Network, Datalink, and Physical. Each of these layers have been explained in detail. Relationship between OSI model and network devices has been given.

This section provides various tutorials on computer networking, a domain that spans various geographies, on which the Internet is born. The articles include ISO OSI model, computer network planning and implementation, RFID standards, spread spectrum communications, IPv6 and many more.

The article provides a detailed procedure in the assembly of rf coax cables for use in rf and microwave communications. The connection assembly and the transmission and reflection coefficients become very important at these frequencies.

The article provides an in-depth view of keeping time and frequencies in case of satellite chain. When communicating over satellite system, it becomes important to keep the communication coherent as the space segment is usually above 36,000 Kilometers and there is a few seconds of delay between transmission and reception of the signals. By knowing exactly how much delay has happened, we can compensate for the same.

The article provides a detailed procedure for noise figure measurements. Noise figure measurement is one of the most important parameter in the receive chain of the satellite - to - ground station link. The signals received at the antenna are very weak and requires a low noise amplifier to keep the noise below the threshold level.

Unlike time domain measurements, which use Oscilloscope, frequency domain measurements use Spectrum Analyzer. The article describes the characteristics and applications of Spectrum Analyzers, and the features that one may need to consider while buying a spectrum analyzer.

The article provides a way of measuring various parameters of an rf coaxial cable. One most important property of a coax is the VSWR, short for Voltage Standing Wave Ratio. This is also expressed in terms of Return Loss (RL).

The section provides various tutorials on RF test and measurements. These include, co-axial insertion and return loss measurement, spectrum analyzer measurements, and noise figure measurements. An article on coax cable construction and assembly is also provided.

This is basically a calculator for link power analysis given various values in a satellite communication system.

This section provides several tutorials on Satellite Communications, including satellite systems, link budgeting, satellite pointing angle calculator, and other related topics.

The article provides a basic introduction with a couple of coding examples using html5, a widely used web programming language these days. Responsive design is popular for compatibility with different types of devices.

The tutorial provides a step by step procedure for drag and drop coding using visual basic dot net. As you might be knowing, drag and drop is widely used in computer based testing (CBT) wherein a user is asked to drag and answer to a matching question.

The article provides a detailed procedure as to how to design and develop activex controls using Visual Basic. ActiveX controls, though became a little obsolete with the advent of .net based framwork, is still used widely.

The article provides step by step procedure for programming with SQL using MySQL and visual basic. As you might be knowing, VB.net and MySQL are powerful combination to develop programs for commercial use.

The section provides various tutorials on software and database programming including VB.net, SQL programming for MySQL, etc., and web development using HTML5 and JavaScript. A couple of programming examples are given for drag and drop and activeX development.

The tutorial is about basic programming for mobile environment, specifically Android apps developement. Having developed several apps using Android, we are proud to give this tutorial.

Practice tests for comptia a+ essentials and A+ practical application using simulationexams.com boson.com certexams.com and others

The blog offers articles and posts on various subjects including SMT, Reliability tests, certification tests like CCNA, and others.

The tool provides a way to measure return loss given the load and source impedance. VSWR (Voltage Standing Wave Ratio) is a metric commonly used with antenna systems for ham or shortwave radio communication. VSWR is normally defined as a ratio with a 1:1 VSWR, indicating that there is an exact or perfect match between all antenna system elements

The tool provides a measure of reflection coefficient given source and load impedance (Zs and Zl). Reflection coefficient is a measure of energy transfer from source to load. The value is 1 when load impedance perfectly matches the source impedance.

The tool offers calculation of inductive reactance and admittance as well as capacitance. These are used widely in rf cable specifications to find the suitability of the cable for a given purpose.

A tool to convert dbm to milli watts. dBm is defined as power ratio in decibel (dB) referenced to one milliwatt (mW). It is an abbreviation for dB with respect to 1 mW and the "m" in dBm stands for milliwatt.

Coaxial Cable Impedance Calculator allows you to enter the Outer Diameter Dielectric width, Inner conductor Diameter width and either the Dielectric Constant or Velocity of Propagation (VoP) values in order to calculate the impedance of the coax.

You provide Outer Diameter (D), Inner Diameter (d), and Permittivity (εr) values then the calculator gives you Zo (ohms), fc Cut off frequency(GHz), C/length (pF/m), and inductance L/length (nH/m). Other tools are available for impedance measurement, dbm to milli watt converter, reflection coefficient calculator, etc.

Tools are provided for measurement of cable impedance, Dual Dielectric Coax Calculator, Milli Watts to dBm Calculator, dBm to Milli Watts Calculator, Reactance Calculator, reflection coefficient Calculator return loss Calculator, and return loss Calculator(by using VSWR) Skin Depth Calculator VSWR Calculator VSWR Calculator(by using RL) Wire Over Ground Calculator

The page offers a tool for configuring custom co-axial cable by specifying the end connectors, cable type, and required insertion and return losses. It can be saved in pdf format and the spec may be emailed after completing the configuration.

Anand Software blog on update to CCNA Netsim to include several labs on Site to Site VPN and FHRP (First Hop Redundancy Protocol). NetSim, used to represent Network Simulator, is tool to configure and troubleshoot wide area networks, particularly in preparing for CCNA certification.

The page offers information about OCPJP, short for Oracle Certified Professional - Java Programmer. The practice tests offered by certexams.com consists of 300+ questions with answers and flash card explanations. The certification was earlier known as SCJP (Sun Certified java Programmer).