interference
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Antennas : Baluns- 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: 282 | 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 ]
- Coax Stubs for 20m and 40m
- When operating contest in a multi transceiver environment interferences between the 40m and 20m are guaranteed. An easy and inexpensive way to reduce interferences is to add coax stub filters
[ Hits: 243 | Votes: 4 | Rating: 8.5 ]
- Variations on a Dipole
- Antenna patterns are all about interference. Presentation on wire antennas for HF bands. Dipoles, horizontal and vertical dipoles, effects of ground on radiation patterns, multi-band wires antennas. Knowing what you should expect from the radiation patterns for waves on your wires will help you choose what will work best for your needs. The principles of interference can lend insight into what to expect from a wire antenna.
[ Hits: 98 | Votes: 0 | Rating: 0 ]
- Unearthing VHF Contest Secrets: An In-Depth Analysis
- In this article, authors delve into the inner workings of the IARU R1 VHF contest, the world's largest 2m contest. While activity levels are declining, the top performers consistently maintain their results. Authors explore the physical constraints of achieving higher point totals and speculate on various factors like improved technical capabilities, increased interference, and evolving station setups. It is a fascinating journey into the contest's dynamics, leaving room for intriguing speculations about its future.
[ Hits: 69 | Votes: 2 | Rating: 10 ]
- Building a VHF Contest Station
- Building an amateur station for competitive radiosport involves a number of critical steps, regardless of the band or bands you focus on. These include, but are certainly not limited to: Station layout, Equipment interconnection and switching, Inter-station interference, Antenna selection. Radio interface with the logging program, CW and voice keyer integration, Rotator control
[ Hits: 328 | Votes: 1 | Rating: 4 ]
- Operating AMTOR
- Putting one of those old modems back into use.AMTOR is an acronym for AMateur Teleprinting Over Radio and was mostly used on HF. The mode is based on the marine SITOR code that was introduced to amateur radio by Peter, G3PLX. The mode is an enhancement of RTTY with active error correction that copes reasonably well with interference and fading.
[ Hits: 81 | Votes: 0 | Rating: 0 ]
- Soundcard Levels for Digital Modes
- This article aims to help promote the proper configuration for having a clean signal on the waterfall to avoid interference to other users and also to vastly increase the effectiveness of your signal.
[ Hits: 279 | Votes: 0 | Rating: 0 ]
- Tropospheric Ducting Forecast Europe
- The areas noted in the forecast have the necessary atmospheric conditions to produce tropospheric bending of VHF, UHF and/or microwave radio waves. Tropospheric bending extends the range of radio & TV stations well beyond their normal limit and thus increases interference amongst stations as well.
[ Hits: 152 | Votes: 1 | Rating: 10 ]
- IC705 GoBox: A Portable Windows-Based Solution for All-Digital Modes
- This project details the creation of a portable GoBox housing an IC705, Windows 11 PC, and Bluetooth microphone. The robust setup, enclosed in a weatherproof Hofbauer Explorer Case, ensures stability and functionality for QRP and emergency radio activities. The aluminum-mounted devices minimize RF interference, and a built-in LifePO4 battery powers the 10.1 TFT touch LED monitor, providing approximately 12 hours of use in receive mode. With a focus on grab-and-go versatility, this GoBox stands as an efficient solution for outdoor ham radio operations.
[ Hits: 93 | Votes: 0 | Rating: 0 ]
- MorseExpert for Android
- Morse Code Decoder for Android based on the algorithms implemented in CW Skimmer. Morse Expert decodes Morse Code audio to text. It is optimized for decoding weak, fading signals in the presence of interference, especially on the Amateur Radio bands. The input audio might come either from the built-in microphone or from another device, such as a radio receiver.
[ Hits: 322 | Votes: 5 | Rating: 9 ]
- Ham Radio and Solar Power Systems
- Can Home Solar Power and Ham Radio Coexist? It is possible, with minimal interference from the
solar power system, provided you make some modifications.
[ Hits: 338 | Votes: 1 | Rating: 9 ]
- Band Pass Filters for HF Transceivers
- If your multiple transceiver station is suffering of intrastation interference, this handy and inexpensive band pass filters and help you. QST article Sept 1988
[ Hits: 127 | Votes: 0 | Rating: 0 ]
- Grounding HF Transceiver using Coax Cable
- Improper grounding or earthing system can cause several unwanted RF interferences (RFI) to television sets, broadcast receivers, hi-fi sets and telephone sets.
In this Article the author explain how to setup a proper radio shack grounding using coaxial cable and ceramic disc capacitor
[ Hits: 1283 | Votes: 4 | Rating: 7.75 ]
- 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 ]
- Undestanding TV and Radio interference
- Ham radio interference to home entertainment devices is a matter we cannot dismiss easily. Fortunately there are simple steps we can take to solve most problems caused by our amateur radio station equipment.
[ Hits: 425 | Votes: 0 | Rating: 0 ]
- Understanding computer-generated RFI
- Radio Frequency Interference (RFI) has always been a source of concern for the Radio Amateur. Until the recent introduction of complex circuitry in the home, our communications gear has been the main source of potential RFI. In this computerized age of ours, increasingly complex and sensitive receivers are being barraged by these and other sources of RFI.
[ Hits: 84 | Votes: 0 | Rating: 0 ]
- Stop RFI from Solar PV Systems
- Stop EMI RFI Interference in Off Grid Solar PV Systems, in this article the author provides hints on tracking down the EMI or RFI source, shielding and grounding in order to eliminate interferences on the whole HF and VHF ham radio bands
[ Hits: 80 | Votes: 0 | Rating: 0 ]
- Solar Panel and Ham Radio
- If you are having problems with RFI from Solar Panels this document from QST provides useful advice. According to this article it is possible to prevent and mitigate RF interferences, with your amateur radio equipment, by suppressing the RF either in the shack and to the solar power infrastructure.
[ Hits: 88 | Votes: 0 | Rating: 0 ]
- Ethernet RFI noise reduction
- How to reduce and eliminate the RF interference at VHF caused by the wired network
[ Hits: 587 | Votes: 1 | Rating: 7 ]
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