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48 links - and 1 categories

Homebase10 Antenna for 28MHz - The Homebase10 is a simple to make wire halo antenna for 10m (28MHz) built using parts available from the local DIY store.The resulting antenna is very effective on 10m despite its small size and light weight.
[ Hits: 3015 | Votes: 6 | Rating: 5.83 ]
Cubical Quad Antenna for 10 mt. - This home-brew antenna for 10 meters band cost just a few dollars, but gave excellent results by WA6CDO
[ Hits: 2266 | Votes: 1 | Rating: 8 ]

Cedevita-20 Antenna - The Cedevita-20 is a hybrid monoband antenna, the result of merging the radiator of a shortened vertical with one element of a dipole. It fits on most balconies and must be hung from the ceiling. By ik1zyw Paolo Cravero
[ Hits: 5374 | Votes: 3 | Rating: 5.33 ]

80 meter frame antenna - This projects was developed as a result of experiments to become QRV on 80 meters, again, using the little balcony by SM0VPO
[ Hits: 6595 | Votes: 8 | Rating: 6.5 ]

Antenna Matching Coil Adjustment Procedure - Without this basic knowledge, addressing antenna problems, RFI problems, and matching problems, results in a frustrating situation. Procedure which must be followed to properly adjust a shunt matching coil.
[ Hits: 2678 | Votes: 4 | Rating: 4 ]

Wire antenna with coaxial cable traps - This multiband antenna 10-80 meters is a home made project by I1BAY. Has been used for SOTA activations with great results. Traps are done with coax cable turns, dimensions are in the attached schema.
[ Hits: 9251 | Votes: 3 | Rating: 7 ]

The Multi-Band Fan Dipole - How to build a multi-band dipole antenna with a single coax feed. Instructions for a 160M antenna that will fit in the space that a 75M dipole will with almost as good of results as a full size 160M dipole.
[ Hits: 3014 | Votes: 7 | Rating: 7.31 ]

88' Zig Zag Double Extended Zepp - A Double Zepp indoor antenna based on Cebik's reccomendations and design. Can cover HF bands, fed with 450 ohm open wire feeder terminating in an automatic antenna tuner, can perform incredible results.
[ Hits: 2686 | Votes: 7 | Rating: 6.71 ]

VHF/UHF Yagi Antenna Design ^pop - Design your VHF UHF Yagi antenna online, a JavaScript enhanced web page that implements the design of an antenna for 2m and 70cm bands. This page offers a streamlined experience for Yagi antenna design enthusiasts. It assumes prior knowledge of Yagi design principles, minimizing distractions with a user-friendly interface. Equipped with essential equations, it provides instant design feedback. Red font warnings indicate design limitations, ensuring practical results. Constraints include Gain (11.8-21.6 dBd) and Boom Length (2.2-39 wavelengths), with additional frequency-dependent restrictions noted in input fields.
[ Hits: 147434 | Votes: 1105 | Rating: 6.95 ]

G8JNJ Broadband HF Vertical Antenna - G8JNJ Broadband HF Vertical Antenna - Requires no tuner - great results from 40m to 10m plus 80m & 6m with reduced performance
[ Hits: 4680 | Votes: 4 | Rating: 7 ]

ARRL Contest results database - The results from ARRL contests are available here.
[ Hits: 665 | Votes: 1 | Rating: 1 ]

Alabama QSO Party - This is the official site of the alabama qso party.these pages contain information about the 2005, 2006 and 2007 alabama qso party rules, information and results.
[ Hits: 414 | Votes: 1 | Rating: 10 ]

About AMTOR - AmTOR may be considered as the next development from RTTY. AmTOR was introduced to overcome the problems with RTTY. As a result of its performance, it has become popular on the HF bands because it gives more reliable communication, especially when interference is present. It achieves this by using a coding system that allows errors to be detected and corrected.
[ Hits: 363 | Votes: 0 | Rating: 0 ]

Near-Real-Time F2-Layer Critical Frequency Map - This map can be used to determine the frequencies that will always be returned to the Earth. Transmitted frequencies higher than the indicated contours (which are given in MHz) may penetrate the ionosphere, resulting in lost power to space. The map shows the radio auroral zones as green bands near the northern and southern poles.
[ Hits: 5270 | Votes: 24 | Rating: 4.84 ]

Super Check Partial Database Files - The Super Check Partial database files provide a list of callsigns used by active contesters. The data comes from Cabrillo logs contributed by contesters themselves. Contributed logs from the past 24 months are used to create the database. These logs are combined and filtered so that they result in a fairly good (but not perfect) list. The files do not contain any QSO data, such as state, CQ zone, Maidenhead Grid Locator, etc. The dta files can be used with CT, WriteLog, TRlog, SD, N1MM Logger, NA, Win-Test, and others
[ Hits: 1363 | Votes: 3 | Rating: 10 ]

linSmith - Smith chart utlity - A Smith charting program. You can enter either discrete components or transmission lines, see the results on screen and/or generate Postscript output. Component values can be changed numerically or using scrollbars.
[ Hits: 1369 | Votes: 1 | Rating: 10 ]
linsmith - A Linux Smith charting program. You can enter either discrete components or transmission lines, see the results on screen and/or generate Postscript output. Component values can be changed numerically or using scrollbar
[ Hits: 561 | Votes: 0 | Rating: 0 ]

LM - Log Post Processor - LM is a program to edit contest logs afterwards, a so-called contest post processor. With help of LM you can convert row data to many different file formats. Allow a quick input interface, and contest score for several contest. Can import & export a batch of logs and to create result lists.
[ Hits: 1344 | Votes: 2 | Rating: 10 ]

Batteries and QRP - Thanks to the popularity of cell phones, laptops and other personal electronic devices, the battery industry has been market-driven to produce higher capacity batteries in lighter weights than previously possible with yesterday's chemistries.As a result, a wide variety of battery types are available to the outdoor QRP operator.
[ Hits: 505 | Votes: 0 | Rating: 0 ]

QRM and noise reduction - You will find on these pages my experiences and results on antennas and local/non-local QRM/noise reduction. Using a broadband vertical active magnetic loop and a home made / designed broadband amplifier. Two vertical magnetic Alford loops are used in an array. Analog and Digital Signal Processing and a dual phase coherent Software Defined Radio (SDR) are used. By PA0SIM
[ Hits: 5086 | Votes: 6 | Rating: 7 ]