common mode
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Antennas : Baluns- Common Mode Currents on Coax
- These baluns are used to attenuate the common mode current that flows on the outside of the coaxial feed line.
[ Hits: 176 | Votes: 0 | Rating: 0 ]
- VHF Baluns: Fact and Fancy
- Our ideas about HF baluns have changed dramatically in recent years. The focus today is very much on suppressing unwanted common-mode RF currents, to reduce both the received noise levels and the risks of causing interference on transmit.
[ Hits: 281 | Votes: 0 | Rating: 0 ]
- Baluns and common mode chokes
- Voltage baluns versus Current baluns. When to use them, differences, and typical usage in feeding antennas, or in resolving radio frequency interferences.
[ Hits: 401 | Votes: 1 | Rating: 10 ]
- How to Blow Up Your Balun
- In this article, author examine stresses placed on common-mode chokes (aka baluns) as hams use/abuse them, examine the efficiency of simple dipole multi- band antennas and their feed systems. Stressing a Balun.
[ Hits: 383 | Votes: 0 | Rating: 0 ]
- RF Chokes
- A chart presenting the results of impedance measurements made on a variety of common-mode choke implementations across the frequency range 1MHz to 30MHz by G3TXQ
[ Hits: 904 | Votes: 2 | Rating: 7.5 ]
- Chocking the End-Fed Antenna
- Stop common-mode current when transmitting with an end-fed antenna. Unbalanced antennas are very prone to currents on the outside of the coax.
[ Hits: 827 | Votes: 1 | Rating: 8 ]
- How to evaluate Choke performance
- If you want to build your own common mode choke, this article explains how to measure the efficiecy of your choke before using it. In the examples has been used Amidon FT240-31 toroids.
[ Hits: 209 | Votes: 1 | Rating: 8 ]
- High Performance common-mode chokes
- May 2015 Radcom Article on common-mode chokes that can be used for control cables, phone lines, but mostly on typical HF antenna systems. This article explain what common mode chokes does, why you meay need one, properties common mode chokes should have, how to build and measure performances.
[ Hits: 681 | Votes: 1 | Rating: 10 ]
- CET Technology
- Manufactures Flyback, Switching, Audio, Toroidal, Current Sense & Custom Trasformer, Drumcore & PFC Inductor, Common Mode Chokes.
[ Hits: 136 | Votes: 0 | Rating: 0 ]
- Duracomm Power Supplies
- Power Solutions for Durable Communication Systems. Founded in Sep. 1992, DuraComm Power Supplies is a worldwide recognized leader in ultra-reliable AC-to-DC switch mode power supplies commonly used in the communications industry.
[ Hits: 139 | Votes: 0 | Rating: 0 ]
- Icom IC-7300 review by GM4FVM
- Author reviews the physical appearance and ergonomics, performance on common operating modes, data modes and computer operation.
[ Hits: 145 | Votes: 1 | Rating: 8 ]
- 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 ]
- Choosing the correct Ferrite
- Common mode currents are those currents that flow in the same direction on a wire bundle, as opposed to the currents that flow
[ Hits: 250 | Votes: 0 | Rating: 0 ]
- How Common Mode Chokes Work
- Examine the function and operation of a common mode choke and the way it reduces unwanted interference. Common Mode Choke vs. Single Choke
[ Hits: 736 | Votes: 2 | Rating: 10 ]
- RFI problem on Samsung TV
- A workaround to common RF interference on Samsung TV LED causing several issues like changing channel, swithcing to demo mode, or changing volume.
[ Hits: 549 | Votes: 2 | Rating: 7 ]
- Cost-effective ferrite chokes and baluns
- In this article the author describes some new designs of ferrite loaded chokes for suppressing unwanted common mode currents at HF applied to feed lines like choke baluns, but also in the shack, applied to various coaxial, mains and data cables
[ Hits: 855 | Votes: 5 | Rating: 6 ]
- Common-mode chokes Measurements
- Common-mode chokes are useful solutions for RFI reduction. Winding a few turns of coaxial cable on the FT 240-31 toroid can reduced the noise below the received noise floor. In this article author measure different chokes
[ Hits: 155 | Votes: 1 | Rating: 8 ]
- Raspberry Pi and Automatic NOAA Satellite Reception
- How to receive automatically NOAA wather satellite images with a Raspberry Pi and a RTL SDR. This project requires a Raspberry Pi 3 Model B a common NooElec SDR Dongle and a QFH Antenna in the attic. Article explains how to setup and configure software but no instructions on antenna.
[ Hits: 518 | Votes: 4 | Rating: 4.75 ]
- Interfacing HAM radio
- An article about interfacing amateur radio devices, usually transceivers to computers. It is a general article that cover common interface models using USB or RS232 for popular ham radio brands like Yaesu Icom and Kenwood
[ Hits: 553 | Votes: 1 | Rating: 10 ]
- 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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