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193 links

Antennas : 160M
  • 22 Antennas for the 160 Meter Band - 22 Different Wire Antennas for the 160 Meter Band, Random Length Radiator Wire, delta loop, loop antennas, off-centered antennas, sloper, dipoles, Z antenna, Zepp and Clothesline Antennas
    [ Hits: 764 | Votes: 1 | Rating: 1 ]
  • The 160M No Excuses Homebrew Vertical - This antenna is designed for stations having a difficult time putting a decent signal on 160M from small or CC&R d lots. It is a 24.5 ft. vertical antenna, made from three 10 ft. PVC sections bolted together, and half wavelength of antenna wire helically wound around the PVC sections.
    [ Hits: 404 | Votes: 0 | Rating: 0 ]
Antennas : 20M : 20 meter Dipole Antennas
  • Vertical Dipole Antenna for 14 MHz by G3PND - An home made vertical dipole antenna made with simple material. The antenna has a total length of aproximately 16 feet. In this article appeared on June QST 2019, the author explain how he reached the optimal confirugation changing and adjusting the lower part of the antenna, trimming and spacing correctly the copper wire. PDF File to downloas
    [ Hits: 1219 | Votes: 3 | Rating: 4 ]
Antennas : 2M
  • Squarooka Antenna - squared bazooka for 2 meters band - Sort of similar to the one of the 6m omni. Instead of using twin-lead, this design makes use of a more or less regular double bazooka antenna (coaxial dipole). Your attention shall be drawn to the available standart literature, such as Rothammel. In order to "compute" the dimension, Karl Rothammel mentioned that the total length of the dipole shall be 95% of the free-space wavelength. The short-circuit bridges (closing the folded dipole) are to be placed at a distance-fraction being equal to the velocity factor of the coax cable used, which will be 66% using RG-58 or RG174.
    [ Hits: 353 | Votes: 0 | Rating: 0 ]
Antennas : 40M : 40 meter Delta Loop Antennas
  • Delta Loop DX Antenna for 40 meters band - A monoband delta loop antenna for the 7 MHz. This vertically polarized DX Antenna is a full wavelength sngle side antenna and has a total length of 42.3 meters (137,1 inch) Can be easily setup with a flag pole or fishing pole as center top mast. For optimal performance lower side should be at 2 meter above the ground. This antenna offers a low radiation angle and 1 DB Gain.
    [ Hits: 431 | Votes: 3 | Rating: 6.33 ]
Antennas : Antenna Calculators
  • Calculate Antenna Lenght in feet, inches and meters - Inches and meters Javascript Wavelength Calculator allow to input a frequency in MHz and calculate wavelenght in several units considering also fractions of wavelenght and the velocity factor. Includes an usefull inch to meter converter
    [ Hits: 502 | Votes: 3 | Rating: 4.67 ]
  • The Antenna Torque Calculator - This unique online tool helps Ham Radio operators to choose the right rotator for medium and large HF antenna systems. The algorithm implemented in this calculator is the result of 40 years of experience in the HF Antenna sector. Given the Wind Speed, the total antenna square area, and the boom length, it will return the calculated torque value.
    [ Hits: 178 | Votes: 1 | Rating: 1 ]
Antennas : Baluns
  • DIY isolation transformers - Article about isolation transformer construction to perform optimal impedance matching. Winding the FCP isolation transformer, includes interesting table for Winding Turns and Lengths and Core Configurations for T300 T200 T400 toroids
    [ Hits: 316 | Votes: 0 | Rating: 0 ]
Antennas : Dipole
  • The Short Dipole - There are several ways to reduce the length of a dipole and still use it as an effective antenna. Remember it is the electrical length that determines resonance. The physical length can be considerably less than a half wave length on your desired frequency as determined by 468/f MHz.
    [ Hits: 202 | Votes: 0 | Rating: 0 ]
Antennas : Homebrewing Techniques
  • Practical Yagi Building - A practical guide on hombrewing Yagi antennas, including notes on Driven Element, Transformation & Symmetrising Coax Lines, Full Boom length vs. electrical length, Elements & Insulators on Boom and additional tips and tricks, in English and German
    [ Hits: 364 | Votes: 0 | Rating: 0 ]
Antennas : Multiband
  • Multi Band Slinky Doublet Antenna - An home made doblet antenna made with two Slinkys that are aproximately five meters in length connected with a twin-feed connected to a balanced ATU
    [ Hits: 461 | Votes: 1 | Rating: 10 ]
Antennas : Theory
  • Optimizing Ground Radials in End-Fed Antennas - An interesting article focused on defining the optimal lenght and number of ground radials in vertical, inverted-L, end-fed antennas. This article compares also the radial length vs number of ground radials to power loss in transmitted power.
    [ Hits: 432 | Votes: 1 | Rating: 10 ]
Antennas : Theory : Antenna Gain
  • The Easy Way Antenna Systems - This document is a must read for anyone considering building a good low cost HF multi-band antenna system. The author combine in this document four important ingredients to produce simple but effective antenna system, like antennas of non resonant length, line attenuation, the transmatch and the balun
    [ Hits: 628 | Votes: 2 | Rating: 4.5 ]
Antennas : Towers
  • Antenna Mast Guying for Amateur Radio Antennas - Article based on ROHN engineering specification that will guide on proper guying heights and guy lengths when guying ham radio antenna masts. It will help you determine ahead of time the proper length of guy wires and the distance from the base of the mast to the anchor points
    [ Hits: 314 | Votes: 3 | Rating: 7.67 ]
Antennas : Tuners
  • F5RDS remote antenna tuner - An home made remote antenna tuner project that with a 6 meter random wire and two radials of about the same length, can tune from 40 to 10 meters without any issue.
    [ Hits: 346 | Votes: 2 | Rating: 2 ]
Antennas : VHF UHF
  • VHF-UHF Long Boom Very High Performance Antenna Designs - Experimental Long Boom Antennas - CP, LPDA, multiband with several NEC Files for 50MHz 144MHz 222 MHz 432MHz but also 902MHz and 1296 MHz Antenna projects. Includes also for each antenna model, in a general comparison table each antenna characteristics including Directive Gain, G/T, E-F/R, H-F/R abd Boom Length. This is a great value comparison table of several commercial and home made VHF UHF antenna projects.
    [ Hits: 188 | Votes: 1 | Rating: 10 ]
Antennas : Wire
  • Long Wire Antenna for portable operations - With the view to establish a quick and easy multi-band antenna deployment for portable and camping operations a simple long wire antenna with an earth or earth plus counterpoise arrangement with a 9:1 voltage unun including a tuner or simply with a tuner is one possible solution. With the 9:1 voltage unun and wire lengths suggested in the below tables the antenna should present non extreme impedances for all HF amateur band frequencies. This page is far from complete and represents the ongoing investigation into this type of antenna. Experiments to date seem to have raised more questions than obvious answers.
    [ Hits: 796 | Votes: 13 | Rating: 8.69 ]
Software : Antenna analysis
  • Antenna Calculation Software - The program consists of tabbed pages for various antenna and transmission line calculation. You can compute the values for an inverted L network that will allow you to match the 50 ohm output of the radio, or you can compute the necessary length in the units of choice for a 5/8 wave vertical for 10 meter band.
    [ Hits: 434 | Votes: 1 | Rating: 10 ]
Technical Reference : Grounding
  • Second floor grounding - Solution for stations located at secondo floor or higher. Lead lengths to the grounding system are much too long to provide a low-impedance RF ground.
    [ Hits: 283 | Votes: 1 | Rating: 10 ]
Technical Reference : Vector Network Analyzer
  • 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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