feeder optimum lenghts

W5QJR Antenna Revisited - This antenna combines the features of a horizontal and a vertical antenna to provide constant signal level to all stations from near-in to more than 1,000 miles It is the optimum antenna for rag chewing and net operation on 40, 80 and 160 meters

Switchable Antenna 80/160 meters band Priority listing - A switchable antenna for 80/160 meters by IK1ZOY. A new version of a 1/4L 80 m. dipole modified for use in 160 m. band. using it's own coaxial cable feeder to wrap a coil.

Coiled Choke Balun for HF - A very practical Balun for HF aerial work is the choke type. It reduces RFI to and from the feeder & at next to no cost or loss.

SWR: Maximum allowable VSWR - 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

Antenna Feeders - Different types of feeders, SWR and matching

Feeder Radiation - 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

Coaxial feeder or RF coax cable - 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

Open Wire Feeders - How to make 450 ohm open feeder

The G5RV Antenna System Re-Visited - The original G5RV antenna system consists of a center-fed horizontal 102' wire plus a 34' length of open-wire 525-Ohm feeder. Louis Varney, the antenna system's developer, intended two other features. Learn more at Cebik website

G5RV Antenna  ^pop - The G5RV antenna, with its special feeder arrangement, is a multiband centre-fed antenna capable of very efficient operation on all hf bands from 3.5 to 28 MHz

Portable Aerial based on the Slim Jim - A modified Slim Jim end fed aerial made out of 300-ohm ribbon feeder cable.

Ladder Feeder Slim Jim Antenna - A good starter project is this Slim Jim antenna for 2 Metres using 450Ω Ladder Feeder

The Bird Feeder Antenna - A hidden antenna must be just that: hidden. So don't install an antenna, but something else. Lika a bird feeder.

The Optimum 6 Element Yagi-Antenna - A 70cm and 2m 6 elements yagi antenna plan based on the IEEE Transactions on Antennas and Propagation

Ladder Feeder Dual Band Antenna - 450Ω Ladder Feeder Dual Band Antenna

Windom Antenna with 4:1 balun - The Windom is an Off-center wire multiband Antenna. The old version was fed just by a single-wire connected on 1/3 of antenna's overall length or with an open-line feeder (later versions). Here is another model with coaxial feeder, which is compatible with Solid States - 50 Ohm output transceivers .

OptiBeam - optimum short-wave antennas, developed by hams for hams

IK-Telecom - The official web-site of the firm IK-Telecom, Finland, manufacturer of base station antenna-feeder systems

Teledao - Manufacturer of Grounding kits, cable, copper lugs, bus bars, brackets, lightning arrestors for coaxial feeder cable & fiber cable lightning protection & grounding

Maxdao Technologies - Maxdao: offer you 7/16, N coaxial connectors, jumper cables, feeder clamps and grouding kits, surge arresters & brackets, wall entries and microwave components used in base tower, power dividers, couplers

Rotating Tower Systems - Using our components you can build a rotating tower with greater capability than 3-4 static towers. A rotating tower allows common rotation of HF stacked arrays, VHF and UHF arrays, and antennas mounted at optimum heights. Component design also allows tower shunt loading and end support for wire antennas

Quest for Optimum Coding for EME - Quest for Optimum Coding and Modulation Schemes for EME Joe Taylor, K1JT Florence EME conference 2008

Amplifier Simulation Program - ASP 4.0 - Design weak signal GaAs FET or bipolar PreAmps. Automatically designs for optimum gain, NF, VSWR or all.

Remote antenna switch - A remote antenna change-over switching using relay powered over the coaxial feeder

SWR bridge - This SWR bridge works by sampling the amount of power flowing in each direction along the aerial feeder.