Engineering Projects

TV and FM antenna installation practices will be preferred to throughout this discussion. Installing TV and FM antennas portrays fairly standard practices that should be followed when doing any kind of communications antennas installation. Never neglect safety. Standard operation procedure should always make safety first on the list of things to do. Locate power lines, telephone lines, and obstacles that could interface with the installation or present a hazard to the installers. A tower structure would require a concrete base as the supporting structure. Guy wires need room for proper…

Here is the procedure of testing crystal oscillator, oscillator capacitor and oscillator inductor. In a previous article we had posted a circuit called universal crystal oscillator tester for testing crystal oscillator. Now we had posted simple method which is summarize in few point on How to Test Crystal Oscillator below. An oscillator with a bad crystal may not oscillate at all, may be erratic, or may not oscillate at the correct frequency. One common crystal failure mode is a broken or corroded internal connection. Or if the crystal has been dropped,…

Power supply has a considerable role in electronic communications equipment. The power supply furnishes the voltage and current requirements for electronics circuit operation. Special high-voltage power supplies used in microwave systems and laser systems enable large power handling tubes and semiconductor circuits to operate. In this section, we are going to look at popular types of power supply circuits and some faults that can occur in them. In this section, we’ll also learn to troubleshoot a traveling wave tube amplifier. Improper operating of a TWT can nearly always be traced…

Before continuing about troubleshooting of traveling wave tube amplifier we have some initial considerations include: To make construction of the tube RF output circuit simple, the collector and helix are grounded. The cathode will be above ground and have a negative voltage on it as shown in figure 1. The helix is delicate and helix current will be small. The collector draws nearly all the current. The helix will be protected with an over current relay that kills the power supplies. Never defeat this relay because the tube can be…