impedance

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impedance

124 links - and 2 categories

Antennas : 40M : 40 meter Delta Loop Antennas
  • Delta Loop for 40 and 20 meter Band by UR0GT - This wire antenna for 40 and 20 meter band feature a good SWR. Horizontal side of the antenna is placed at two meters above the ground. Impedance of the antenna are depending by the height of the base from the ground and conditions of the ground
    [ Hits: 533 | Votes: 5 | Rating: 7.8 ]
Antennas : Baluns
  • Switchable MTFT for Wire-Antennas - A switchable Magnetic Transformer for Transmitting for various impedances
    [ Hits: 1211 | Votes: 89 | Rating: 7.98 ]
  • DIY isolation transformers - Article about isolation transformer construction to perform optimal impedance matching. Winding the FCP isolation transformer, includes interesting table for Winding Turns and Lengths and Core Configurations for T300 T200 T400 toroids
    [ Hits: 316 | Votes: 0 | Rating: 0 ]
  • Unun vs Balun - Configurations and differences - If you ever asked if you need an Unun or a Balun this article is for you. The right question should be do I need a feed line choke or an impedance transformer whose output is configured as balanced or as unbalanced. An impedance transformer can be configured as a voltage transformer or as a current transformer.
    [ Hits: 342 | Votes: 3 | Rating: 6.67 ]
Antennas : End-Fed
  • End-Fed antenna for 17 and 12 meters - Article about an end-fed anntenna for the 17 and 12 WARC Bands. 30 meters is not included in this project. This antenna includes a 14 windings unun impedance transformer using a FT-140-43 ferrite toroid, that should be enought for a 100W PEP.
    [ Hits: 539 | Votes: 3 | Rating: 4.33 ]
  • Multi-band End-Fed Antenna - An excellent guide to homebrewing multi band end-fed antennas. The article, embed several drawings including diagrams and detailed pictures, illustrating the basic funcionality of end-fed antennas. The author gives some basic hints on how to build a half size antenna for 80 40 to 10 meters and a 6 meter to 40 meter configuration. It is also well described how to build the impedance transformer and the loading coils for lower bands.
    [ Hits: 1100 | Votes: 6 | Rating: 4.5 ]
Antennas : End-Fed : End Fed Half Wave Antenna
  • 20m Half-Wave End Fed  updated - A Half wave antenna has a high impedance feed point. This can be matched using a 1/4 wave stub matching section and converts the 40m vertical into an L-shaped 20m J-Pole antenna. The 300 ohm feeder used for this purpose must be kept away from the ground.
    [ Hits: 1841 | Votes: 7 | Rating: 8 ]
Antennas : Patch
  • The Basics of Patch Antennas - This article explores the basic concepts of patch antennas. Topics include principles of operation, impedance matching, radiation pattern, circular polarization, bandwidth, efficiency, alternative feed types, stacked patches and higher mode behavior.
    [ Hits: 803 | Votes: 1 | Rating: 9 ]
Antennas : Satellite
  • Dish Antenna for 2.4 GHz Satellite Reception - Modified 80cm Offset Dish for 2.4 GHz Satellite Reception. This 50-ohm impedance antenna allows, when connected to 2.4GHz preamplifier and downconverter, to receive Amateur satellites with 2.4GHz transponders such as AO-40.
    [ Hits: 317 | Votes: 1 | Rating: 5 ]
Antennas : Theory : Impedance matching
  • Popular Matching Networks - What happens in impedance space when the various popular matching networks (antenna tuners) are adjusted
    [ Hits: 275 | Votes: 0 | Rating: 0 ]
Antennas : Wire
  • Long Wire Antenna for portable operations - With the view to establish a quick and easy multi-band antenna deployment for portable and camping operations a simple long wire antenna with an earth or earth plus counterpoise arrangement with a 9:1 voltage unun including a tuner or simply with a tuner is one possible solution. With the 9:1 voltage unun and wire lengths suggested in the below tables the antenna should present non extreme impedances for all HF amateur band frequencies. This page is far from complete and represents the ongoing investigation into this type of antenna. Experiments to date seem to have raised more questions than obvious answers.
    [ Hits: 796 | Votes: 13 | Rating: 8.69 ]
Radio Equipment : Antenna Analyzers Software : Antenna analysis
  • Zplots - Impedance Plots with MS Excel Charts - Zplots is an Excel application that allows you to plot impedance and related data obtained from a variety of sources. You can plot on both an XY chart and a Smith chart as well as view the data in tabular format. The XY chart can be customized with your choice of trace lines. Frequency (in MHz) is always shown on the X axis.
    [ Hits: 296 | Votes: 0 | Rating: 0 ]
  • Balun_cmr Calculate common-mode impedance - This EXCEL Program Worksheet calculates the common-mode impedance of a 1:1 Guanella (current) balun which is placed at the feed point of a balanced antenna system fed via coax.
    [ Hits: 400 | Votes: 1 | Rating: 10 ]
Technical Reference : Calculators Technical Reference : Coax Cables and Connectors : Testing Coax Cables
  • RF Cable Testing - The cable testing approaches discussed in this article gives an idea about the electrical characteristics of a coaxial cable. Velocity of Propagation, Characteristics Impedance, Return Loss Measurement and more
    [ Hits: 451 | Votes: 2 | Rating: 4 ]
  • Measure Impedence of Coax Cables - This video shows one way to use a scope and function generator to measure the length of a piece of coax transmission line as well as estimate its impedance
    [ Hits: 1091 | Votes: 3 | Rating: 6.67 ]
Technical Reference : Dummy Loads
  • Building A RF Dummy Load - If your doing any home brewing gear for ham radio its a great idea to have a dummy load. This will to your radio be the perfect antenna...it will never radiate but your radio sees a perfect 50 Ohm impedance.
    [ Hits: 1460 | Votes: 5 | Rating: 8.6 ]
Technical Reference : Test Equipment
  • Return Loss Bridge - This Return Loss Bridge has been designed to characterize the input impedance of a receive strip, and the output impedance of a transmit strip
    [ Hits: 322 | Votes: 2 | Rating: 1 ]
Technical Reference : Vector Network Analyzer
  • miniVNA PRO Modifications - The mini Radio Solutions miniVNA PRO is the only affordable vector network analyser (VNA) I know of that offers remote wireless operation. This is very interesting because it allows to measure the input impedance of HF antennas installed at height without having to deal with coax cable lengths, baluns nor common mode suppression chokes. However, to render the miniVNA PRO truly field proof, it requires a number of significant modifications.
    [ Hits: 136 | Votes: 5 | Rating: 7.8 ]

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