'Feed point' diaporamas de présentation

Technician License Class

Technician License Class. Propagation, Antennas and Feed Lines. Propagation. Radio waves travel in straight lines. Except: Reflection. Bouncing off reflective surface. Refraction. Gradual bending while traveling through atmosphere. Diffraction. Bending around edge of solid object.

1.63k views • 147 slides

Technician License Class

Technician License Class. Chapter 4 Propagation, Antennas, and Feed Lines. Propagation. Radio waves travel outward from an antenna in a straight line 3 phenomena possible after that: Reflection Bouncing wave off reflective surface Refraction

1.66k views • 143 slides

Technician License Class

Technician License Class. Chapter 4 Propagation, Antennas, and Feed Lines. Propagation. Radio waves travel outward from an antenna in a straight line 3 phenomena possible after that: Reflection Bouncing wave off reflective surface Refraction

1.68k views • 143 slides

1.26k views • 104 slides

979 views • 85 slides

NVIS, Another Look

NVIS, Another Look. Fixed Installation Tri-Band. Tom Sanders, W6QJI Ed Bruette, N7NVP. Near Vertical Incident Skywave. Cloud Warmer. What is NVIS?. Propagation Theory. NVIS Effect. 300 Mile Coverage. 5/8 Wave 75 Meter Vertical Radiation Pattern. Propagation Considerations.

951 views • 68 slides

Space Challenged NVIS Antenna

1.71k views • 59 slides

General Licensing Class

General Licensing Class. Subelement G9, Questions Only Antennas and Feedlines 4 Exam Questions, 4 Groups. G9A01 Which of the following factors determine the characteristic impedance of a parallel conductor antenna feed line?.

683 views • 57 slides

The distance between the centers of the conductors and the radius of the conductors

G9A01 Which of the following factors determine the characteristic impedance of a parallel conductor antenna feed line?. The distance between the centers of the conductors and the radius of the conductors The distance between the centers of the conductors and the length of the line

760 views • 56 slides

Practical Antenna Modeling Using NEC Codes

Practical Antenna Modeling Using NEC Codes. With Examples of HF Wire Antennas and 4NEC2. Gary Rondeau , AF7NX. Overview. Describe the NEC codes How to define and edit the models Running the simulations and work flow Work some examples Using Variables Deal with Feed Lines in the models

1.37k views • 45 slides

Numerical Control

Numerical Control. It might be said that numerical control is control by numbers. Numerical control uses any of the basic machine tools. In a broad sense, numerical control converts numerical values into physical values, such as quantities and dimensions.

738 views • 39 slides

Chapter 6 Antennas

Chapter 6 Antennas. Antenna Basics Antennas contain conducting elements (wire or metal poles).

643 views • 37 slides

Chapter 6 Antennas

Chapter 6 Antennas. Antenna Basics Antennas contain conducting elements (wire or metal poles).

457 views • 37 slides

General Licensing Class

540 views • 32 slides

Off-Center Fed Dipoles

Off-Center Fed Dipoles. Practical Applications. Why?. Looking for solutions for low band antennas Was abused by a counterpoise as a child Looking for multiband solutions Traditional low band wire arrays use dipoles or inverted vees Applications to driven & parasitic arrays.

789 views • 29 slides

Basic Wire Antennas

Basic Wire Antennas. Part I: Dipoles. Dipole Fundamentals. A dipole is antenna composed of a single radiating element split into two sections, not necessarily of equal length. The RF power is fed into the split. The radiators do not have to be straight. Dipole Characteristics.

1.58k views • 29 slides

Attainable Region

Attainable Region. S,S&L Chapt. 6. Attainable Region. Graphical method that is used to determine the entire space feasible concentrations Useful for identifying reactor configurations that will yield the optimal products. Procedure.

330 views • 25 slides

Intermediate Course (5) Antennas and Feeders Karl Davies

Intermediate Course (5) Antennas and Feeders Karl Davies. East Kent Radio Society EKRS. Standing Wave Ratio Meter. Antenna. Feeder. System. 50 Ohms Output. Antenna Matching Unit. Transmitter. Receiver. ??????. Feeders. Feeder types: Coaxial, Twin Conductors.

275 views • 13 slides

Chelmsford Amateur Radio Society Intermediate Course (5) Antennas and Feeders

Chelmsford Amateur Radio Society Intermediate Course (5) Antennas and Feeders. Standing Wave Ratio Meter. Antenna. Feeder. System. 50 Ohms Output. Antenna Matching Unit. Transmitter. Receiver. ??????. Feeders. Feeder types: Coaxial, Twin Conductors.

238 views • 13 slides

Simple, Efficient Microwave Hybrid Power Dividers

Simple, Efficient Microwave Hybrid Power Dividers. By Robert J. Templin W5OE Roadrunners Microwave Group. Reasons for Hybrids. EME and other applications require higher microwave power High power MW amps are TWTs or other high voltage devices

276 views • 11 slides