real

297 links - and 1 categories

Cross-Yagi 10el Antenna for 70cm - 10 Elements Cross-Yagi Antenna for 433 MHz. The base of the 10el antenna is the recalculated RA6FOO antenna.Circular polarization is realized - by a phasing quarter-wave line, matching of horizontal and vertical polarization antennas
[ Hits: 176 | Votes: 6 | Rating: 8.83 ]

The Magloop Antenna Calculator - The Magloop Antenna Calculator was developed to predict the characteritics of a small-loop (aka magloop) antenna, given physical dimensions entered via slider widgets. This magnetic loop antenna calculator works also on most mobile devices, adjusting sliders and calculating dimensions in real time.
[ Hits: 298 | Votes: 5 | Rating: 8.2 ]
Microvert antenna calculator - Online antenna calculator for the microvert capacitive antenna
[ Hits: 124 | Votes: 2 | Rating: 8 ]

Phased Array Antennas - Phased array antennas are composed of multiple individual antenna elements that can have their phase and amplitude controlled to steer the main beam direction in real-time. They are used in radar, communications, and electronic warfare, and offer improved gain and reduced side lobes. A comprehensive document on Phased Arrays include techniques to increase the Antenna Gain and change the Radiation Pattern
[ Hits: 82 | Votes: 0 | Rating: 0 ]

An introduction to the air cored coil - We use the term air core coil to describe an inductor that does not depend upon a ferromagnetic material to achieve its specified inductance. This covers the cases where there really is just air inside as well as windings upon a different insulator such as bakelite, glass or PTFE etc. Do you need an air coil?
[ Hits: 106 | Votes: 1 | Rating: 2 ]

How to find out if your choke works - How many times have you heard the advice to coil a few turns of coax at the antenna end to form a choke. How to find out if your common mode current choke really works
[ Hits: 211 | Votes: 1 | Rating: 9 ]

Short Multiband Dipole Array - A multiband shortened fan dipole. This page offers and online calculator that can be really useful if you plan to homebrew a multiband dipole for low HF bands and you don't have all needed space for the full lenght. It combines multiband dipole with loading coild for selected bands.
[ Hits: 229 | Votes: 0 | Rating: 0 ]

K0UO Rhombix Antenna Farm The Ground - Modeling an antenna over real terrain gives you a visual picture of how terrain impacts performance. You can use a model to determine optimum height for antennas on an existing tower, Compare different tower locations for performance, Compare different sites for performance
[ Hits: 144 | Votes: 1 | Rating: 10 ]

HF DXView Propagation Map - This map shows real-time radio propagation from stations operating on 11 bands between 1.8 and 54 MHz in the amateur radio service. The display shows world-wide activity from the last 15 minutes and is automatically updated about every minute. Data for the map is gathered from several online sources: WSPRnet, Reverse Beacon Network (CW, FT4, FT8), PskReporter, and DX Cluster.
[ Hits: 302 | Votes: 5 | Rating: 7.6 ]

Interactive Worldwide Map of Amateur Radio and more - The first interactive map of amateur radio repeaters and more updated in REAL TIME.
[ Hits: 433 | Votes: 7 | Rating: 9.72 ]

Aircraft Scatter on 6 Meter FT8 - Aircraft scatter is easily seen on the spectrogram window of digital communication apps, when you know what to look for. Examples of real aircraft scatter usage on six meters band
[ Hits: 180 | Votes: 2 | Rating: 9.5 ]

HF-Start WebTool - HF-START can estimate HF propagation between any given 2 points over Japan in real-time by using GNSS tomography, and can be used to forecast HF propagation 1 day in advance between any given 2 points globally by using GAIA model.
[ Hits: 111 | Votes: 0 | Rating: 0 ]

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: 315 | Votes: 0 | Rating: 0 ]

Power and VSWR Indication on the FT-817 - Reflected power and VSWR Metering on Yaesu FT-817, and proper interpretation of real values. The power output meter it is a relative indicator of the antenna match that the radio is experiencing. Reference table and how correctly read the values of the Yaesu internal meter.
[ Hits: 148 | Votes: 0 | Rating: 0 ]
FT-817 Batteries for Air Travel - Three cell Lipo batteries for the FT-817 work really well, although not really sure about taking them on aircraft. The Lipos intended for use on RC Electric airplanes generally have a very low internal resistance and no internal protection against short circuit.
[ Hits: 140 | Votes: 0 | Rating: 0 ]

AircraftScatterSharp - Aircraft Scatter Sharp is a windows application to calculate and assist airscatter operations. Real-time capture and display of plane position data derived from internet plane servers, highlighting of aircraft near the ideal position for scatter, Real-time estimation of Doppler shift and its rate of change.
[ Hits: 144 | Votes: 0 | Rating: 0 ]

HamAward - HamAward is a cloud based amateur radio logbook allowing multi operators multi station activities, featuring real time cloud logging with live score counters. This online tool is addressed to support multi station award operations and management.
[ Hits: 109 | Votes: 0 | Rating: 0 ]

TNXLOG - This log software sends current QSOs to TNXQSO.com server, receives from your TNXQSO.com server your current RDA, Locator, and RAFA, keeps real-time QSO statistics, support for working with CW macros by the COM port. It is not intended to be used as a generic ham radio logbook program, but as a companion of tnxqso service
[ Hits: 101 | Votes: 0 | Rating: 0 ]

Proplab-Pro - Ray-trace radio signals through a realistic three-dimensional ionosphere using Proplab-Pro. This software has been used by the military, researchers, universities and amateur radio operators around the world to assist in determining radio propagation conditions and radio signal behavior. It is one of the most respected and well established software packages for radio engineers and enthusiasts, being actively updated for over 28 years.
[ Hits: 171 | Votes: 0 | Rating: 0 ]

Resistor combination finder - If you need a non-standard resistor value you could probably realize a close match using two resistor. If you use two resistor in series it is quite easy to figure out which values give the best match; on the other hand, using a parallel connection it is not so easy (at least for me) to find a good combination. This resistor calculation tool shows which combinations of two resistors (series or parallel) gives a match better than the closest standard value, for the E12 (10%), E24 (5%) and E96 (1%) series.
[ Hits: 56 | Votes: 1 | Rating: 10 ]