pa system

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pa system

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Antennas : Dipole
  • Short Monoband Dipole Antennas - KGD Antennas - The KGD antenna is an option for those with space restrictions. The idea behing this project is to provide a short dipole antenna for HF Bands and to allow operations on HF bands when its not possible to setup large antennas, using these short base loaded dipoles.
    [ Hits: 240 | Votes: 0 | Rating: 0 ]
Antennas : Feed Lines : Choke
  • Some secrets of Common Mode Chokes revealed - This is a small collection of K9YC info and my experiences. Problems by feed lines of 1/2 lambda length. CMCs in transmitting and receiving systems. Antenna unbalance, Maximal allowed power, Choke winding tips.
    [ Hits: 174 | Votes: 1 | Rating: 10 ]
Antennas : Portable
  • A Compact and Stealthy Field Portable Antenna - In the quest for an ideal field portable antenna, the author recounts experiments involving various wire configurations. While a previous candidate, a 41ft random wire, proved effective but lacked stealth, the search led to a surprising rediscovery of a design previously rejected—the Rybakov Antenna. With a focus on simplicity, rapid deployment, and multiband capability, the author explores the versatility of a 26ft Rybakov, avoiding the halfwave trap. The article delves into the antenna's performance and its potential as a discreet, resonant solution for field operations, addressing the challenges encountered during a POTA activation. Additionally, the Unun/Balun design used in conjunction with the Rybakov Antenna is discussed, providing insights into achieving a balanced system.
    [ Hits: 149 | Votes: 1 | Rating: 1 ]
Antennas : Skeleton Slot Antennas : VHF UHF
  • IAT Interactive Antenna Table - IAT is an excel sheet table evaluate parameters of VHF UHF antennas edited by Vladimir UR5EAZ. The difference between this tool and the existing VE7BQH Antenna Table is the use of G / T and C / N instead of the G / Ta parameter. In this table, Vladimir applies the ITU recommendations to assess the noise properties of a radio receiving system and shows the advantage of the G / T concept over the G / Ta concept when choosing an antenna.
    [ Hits: 104 | Votes: 4 | Rating: 9.5 ]
Operating Modes : Aircraft scatter
  • Aircraft Scatter Operations - QSO Procedure for Airplane Reflections, Reporting system and procedure, confirmation procedure and requirements for a complete QSO
    [ Hits: 146 | Votes: 1 | Rating: 10 ]
Operating Modes : GPS
  • Homebrew GPS tracker - It is easy today to build a GPS tracking system for mobile applications that can be adapted to your needs. In fact, it is more accurate to speak of a GNSS (Global Navigation Satellite System) tracker, a term which encompasses the 4 positioning systems or satellite constellations.
    [ Hits: 241 | Votes: 1 | Rating: 7 ]
Operating Modes : Packet Radio
  • APRS and Packet Radio made easy - The Raspberry PI 3+4 has proven itself as an amateur radio computer. Both at home as the main computer in the shack but also on the road. It is small, inexpensive and incredibly versatile. The operating system and the most important programs are available for free.
    [ Hits: 144 | Votes: 0 | Rating: 0 ]
Propagation : Resources
  • VHF APRS Propagation Map - VHF – Based on realtime APRS reports. This map shows real-time radio propagation from stations operated near 144 MHz. It uses data gathered by Automatic Packet Reporting System-Internet Service (APRS-IS) from packet stations in the amateur radio service. The map shows activity from the past hour. Paths are smoothed to create a color-coded footprint indicating the distance VHF signals are likely to be traveling.
    [ Hits: 308 | Votes: 0 | Rating: 0 ]
Shopping and Services : Remote Radio
  • RemoteTX - The RemoteTx ham radio remote control system is an economical way to control your amateur radio station through the Internet with a phone, tablet, Mac or PC. There are 3 main parts to the solution. Conveniently operate your station with a smartphone, tablet or laptop anywhere you have Internet access.
    [ Hits: 244 | Votes: 1 | Rating: 1 ]
Software : Antenna analysis
  • AN-SOF - Professional Antenna Simulation  updated - AN-SOF is a professional comprehensive software tool for the modeling and simulation of antenna systems. AS-SOF allows to describe antenna geometry, Choose construction materials, Describe the environment and ground conditions, Describe the antenna height above ground, Analize radiation pattern and front-to-back ratio, Plot directivity and gain, Analize input impedance and VSWR,Predict antenna bandwidth
    [ Hits: 240 | Votes: 2 | Rating: 10 ]
Software : Contesting
  • Tucnak - Tucnak is multiplatform VHF/HF contest logbook. It is executable on Linux and other unix-type systems. Since v3 also native under MS Windows, Android and Kindle
    [ Hits: 136 | Votes: 1 | Rating: 10 ]
Software : Decoders
  • Wavecom W-CODE - W-CODE is a professional digital mode decoder system capable to decode many digital signals on HF, VHF/UHF, SHF and SATELLITE bands.
    [ Hits: 440 | Votes: 1 | Rating: 10 ]
Software : Linux
  • WsprDaemon - WsprDaemon is a robust application for Linux systems that decodes Weak Signal Propagation Reporter (WSPR) signals, operates with networked KiwiSDRs, Includes baseband audio input option, provides a reliable reporting function to the wsprnet.org database
    [ Hits: 109 | Votes: 0 | Rating: 0 ]
Software : Radio Programming
  • DMR Contact Manager - DMR Contact Manager is a Free software package designed to make it easy to maintain channel, zone, contact and call group information in these radios. It is fully compatible with the Ham-Digital and RadioID database systems and allows instant codeplug updates from a wide variety of sources. DMR Contact Manager is designed for use with Connect Systems CS700/CS701/CS750/CS800/CS801/CS800D radios, as well as the Tytera MD-380/390/390GPS, TYT MD2017/MD9600, AnyTone AT-D868UV and AT-D858, Retevis RT3, and similar radios that use the RDT/RDB file formats.
    [ Hits: 352 | Votes: 2 | Rating: 9 ]
Technical Reference : Coax Cables and Connectors
  • Understanding Impacts of 75-ohm Devices in 50-ohm Systems - This article explores the implications of using 75-ohm devices, common in TV setups, within 50-ohm systems. While mismatched cables and connectors may lead to minimal consequences in receive-only setups, potential losses and reduced isolation in splitters and taps are examined. The article concludes that, for general applications, inexpensive TV-type components can offer reasonable performance with some trade-offs
    [ Hits: 145 | Votes: 2 | Rating: 9.5 ]
Technical Reference : Grounding
  • How to Ground an Antenna: aerial earthing - The antenna ground or earth system can be key to its operation whilst also being a key safety feature. This article is about grounding systems for antennas, covering different aspects of grounds made for antenna safety, or expressly for lightning or just to improve antenna performance, being ground an antenna component.
    [ Hits: 230 | Votes: 1 | Rating: 4 ]
Technical Reference : Radio Frequency Interference
  • RF-Quiet Solar PV for Ham Radio - This article discusses the potential for solar power systems to coexist harmoniously with amateur radio, challenging the notion that they are inherently incompatible. Drawing from personal experience, the author emphasizes the importance of selecting RF-quiet components, focusing on series-string Sunny Boy grid-tie inverters. The article also highlights considerations for system design and limitations based on roof orientation, shading, and array size. Overall, it presents a valuable perspective on creating a radio-friendly solar PV setup.
    [ Hits: 77 | Votes: 1 | Rating: 1 ]
Technical Reference : Raspberry Pi
  • Setup Raspberry Pi for Ham-Radio - A complete guide to install and configure a raspsberry pi for amateur radio usage. In includes from preparing a SD card, installing the operative system, configuring the Pi, and installing all ham applications you will ever need.
    [ Hits: 289 | Votes: 1 | Rating: 5 ]
Technical Reference : Vector Network Analyzer
  • Measuring with a MiniVNA - Measuring technicques using a MiniVNA, author describes how to determine and unknown inductance, or how to determine an unknown capacitance, crystals, how determine insertion loss and directional attenuation of couples and power dividers, coax switches or even common mode chockes.
    [ Hits: 185 | Votes: 1 | Rating: 1 ]

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