Feed Lines
Antenna and feed lines
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- Choke (31)
- Coax Stubs (7)
- Open Wire (12)
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A simple accurate power splitter for the 70cm uplink to Oscar 13 -
Transmission Line 75 ohm to 50 ohm Transformers -
An homebrew antenna tuner project -
Excel spreasheet that calculate virtually every transmission line parameter that one may need. Include Length conversions, Reactance and Length of Stubs -
Easy for calculate formula which could be a wake-up call for you. The SWR value at the input of antenna cable is not a actual SWR of your favorite antenna. -
Ladder Line Myths, Line Types, Spacing and Impedance, Length by KV5R -
Calculate Cable Loss from SWR and reverse. Text file with only two simply formulas -
How to measure antenna feed balanced lines currents -
Why twinlead isn't necessarily a low loss feed line. -
Tips on tuning antennas using Antenna Tuning Units also called ATU. This article explains the functions and ills of tuners, along with some guide- lines for building an ATU. -
Tuning mobile and base antennas, measuring SWR. -
To build a Band Decoder to drive our remote relays, we need to supply the band information from the rig to the decoder -
KE4UYP designed this Balanced Self Matching Feed Line System for people who want the very best feed line they can have on a Monobanded antenna -
Experience of band filters, for a contest multi operator enviroenment -
Various publications through the years have shown how the SWR measured on a shorted (or open) feed line can be used to calculate feed line attenuation -
A Portable Low Frequency Antenna Analyzer, For those of us who like to play with antennas on the ham bands, one of the handiest tools to have around the shack is an "antenna analyzer". These gadgets combine a signal generator and standing-wave ratio (SWR) sensor in a small battery-powered unit. -
A center antenna insulator with feedline strain relief -
Table representing loss of Coax Cables in db per 100ft. -
Coaxial cable loss in db per 100 ft. -
Coax cables, pictures and specifications -
Useful data-sheet on RG coax cables compiled by NA5N -
An overview of coax cable often called coaxial feeder or RF cable, used to feed antennas and deliver radio frequency power from one point to another -
Understanding Common Mode and Differential Mode Currents on Transmission Lines by K9YC -
This is a concept paper, not a constuction article. There are too many variables to propose a one size fits all design. However, this paper should give you the basic idea how to do it -
ordinary transmission line theory -
The goal of detuning is not to avoid resonance, but rather to minimize re-radiation and/or current in the interfering structure. -
Maybe yes, maybe no. It all depends on the type of antenna and feed line you're using. QST Article in pdf format -
Calculate online, ERP in dB and dBi given PWR Frequency Coax lenght and type and antenna type -
This paper discusses the sources of feed line currents and the methods used to control them. -
Connecting centre fed antennas, dipoles, yagis, rhombics, loops to coaxial cable, unless care is taken, it is not difficult to end up with feeder radiation resulting in power loss and the radiation characteristics changes -
End-Fed antennas are NOT balanced systems; but neither are verticals, ground planes, discones, windoms, zepps, Marconis, half-slopers, et al. Additionally, the low-impedance antenna port of your transmitter/receiver is not balanced. -
Transferring Radio Frequency Energy from Your Transmitter to Your Antenna by Don Keith N4KC -
Collection of articles about ground systems -
The purpose of this remote antenna switch was to be able to select between four different antenna combinations The unit was designed to work at RF power levels of around 100 watts by G8JNJ -
A very beginner's guide to coax cables. Characteristics, detailed comparison of typical coaxial cables, commonly used connectors, and a few words about SWR. -
A new method of feeding a dipole with toroids. -
Don't neglect one of the most important parts of your station! -
A system view of the line isolator -
Types of coax-cable with rf attenuator calculator, line loss calculator form includes an antenna gain calculator. This coax loss calculator can help you on choosing the right cable for your antenna sysmte. -
5D-FB,8D-FB,10D-FB cables offer very low attenuation comparable to that of famous Andrews' Heliax and 8D-FB is almost half that of standard RG-213 for an equivalent diameter! -
The magic "T" combiner is a very useful device. It can provide equal voltages, equal current, or equal power to matched or unmatched loads. It is not a magic bullet. -
How to make a half l or quarter l coax cable for a specific frequency -
Improving measurement accuracy when low-power analyzers are used. -
The Remote Control Antenna Switch consists of two circuit boards. The control unit and the remotely controlled switch -
RF coax(ial) connectors are a vital link in the radio spectrum. Coax connectors are often used to interface two units such as the antenna to a transmission line, a receiver or a transmitter. The proper choice of a coax connector will facilitate this interface. -
This calculator computes the matched line loss for a transmission line using a model calibrated from data for the transmission line types built in to the calculator. It also gives an estimate of the mismatched loss if the mismatch is specified. -
This calculator computes the matched line loss for a transmission line using a model calibrated from data for the transmission line types built in to the calculator. It also gives an estimate of the mismatched loss if the mismatch is specified. -
An article by VE1VQ that illustrate how to home made a balanced feed line -
SWR (standing wave ratio), is a measurement of how efficiently your antenna system will radiate the power available from your radio. In simple terms, your radio would like to radiate all of its power, but can only do so if the other components cooperate -
Single Coil Z Match, circuit Diagram and homebrewing notes -
BesserNet Reflectometer is a fun SWR calculator and simulator Java applet -
VSWR (voltage-standing-wave-ratio) represents the degree with which an antenna is "matched" to the system impedance. Most modern antennas do not require any tuning for optimum performance. VSWR is one of the easiest parameters to measure and VSWR meters are becoming very popular antenna installation tools -
The T-Match with its balanced feed point is one method of feeding a Balanced Dipole. -
Balanced feed with coaxial line by John F. Clemens W9ERN -
Impedance matching, Transmission Lines, Characteristic Impedance, VSWR & Mismatch and Antenna Losses -
Simple, easy to built match developed in 1995 for Yagis with resistitive loads of 12.5, 18 and 28 Ohm. -
A transient analysis of an inpedance transforming device, by W9DMK, in pdf format -
How to calculate "phasing line" lengths that actually work. -
Usage and benefits of transmatch. A pdf document from a QST article made available for novices and beginners by ARRL -
Whenever you choose a coax feedline, the frequency of operation is a very important consideration. Over the operating bandwidth of the coax the VSWR is low, typically 1.2:1 or better. Insertion loss is also an important parameter. It is usually specified in dB/foot and is a linear relationship. -
About feed lines, parallel lines and coaxial lines, notes on impedance, SWR, Baluns, velocity factor and more by NZART -
Myths and basic truths on transmission lines -
One another useful Table for the HAM's practice. -
Using delta match with HF antennas design -
Article gives a good overview of the basics and reflects the accepted wisdom from BC antenna work. -
An Energy Analysis at an Impedance Discontinuity in an RF Transmission Line -
The KI7CX 2.4 GHz Cheap & Easy antenna/feed -
ladder-line is great - extremely low loss, even at high SWR. However, many hams refuse to use it because they are afflicted by common misconceptions -
How to setup a proper antenna feed line with a particular attention to RFI by K0GKJ -
Article on antenna feed impedance and the importance of matching RF andtennas to feeders, including notes on Radiation resistance, loss resistance, and efficiency are also detailed. -
Different types of feeders, SWR and matching -
The feed line (also called the transmission line) is the RF power conduit between your radio and your antenna. The quality of your feed line is critical to your station. ARRL Article that explains differences among various commonly used feed line systems -
Choosing the right feed line for your antennas, is a critical decision to your station setup. -
50 Ohm Coax Antenna Power Splitter and Matching Network -
A system to lay the antenna cable through a closed window by OE1VFW -
Article descrive the different types including coax and open-wire feeder and waveguide. -
Calculate the inductance of twin lead online -
How to handle feedline radiation issues -
Myths and information about ladder line by KV5R -
Transmission lines have many uses other than simply transferring RF power from one point to another. Impedance matching, baluns and filters are probable the most common of these. -
A transmission line caculator Java applet that can be run on your computer or by using your web browser. This calclucator can also be run on your PC by following instruction and download link. -
A windows impedance calculator software by VK3UM -
Experimenting a low impedance feedline by G3TXQ -
This blog post discusses the use of TV-type 75 ohm splitters and taps in 50 ohm systems on the amateur HF, VHF, and UHF bands. The author shares insights and tips on how hams can effectively utilize these components for their radio setups. Whether you are a beginner or experienced operator, this information can help you optimize your equipment and improve your radio performance.