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891 links - and 5 categories

Antennas : 10M
  • A portable 10/20/40 mt vertical antenna  pop - A portable vertical antenna for 10 to 40 meters, designed for mobile operations can be used in a car as seen in pictures. A modified version for 20 and 40 meters is described too.
    [ Hits: 68317 | Votes: 33 | Rating: 4.99 ]
Antennas : 2M
  • A Collapsible 2-Element Delta Quad  updated - This easy-to-build and inexpensive 2 meter antenna is also made to store easily. It's designed for hand held use, so it's great for fox hunting! By Charles Scharlau, NZ0I
    [ Hits: 2467 | Votes: 3 | Rating: 6.50 ]
  • The Little Stick Antenna  pop - The Little Stick antenna is an aluminium version of the Vertical Bazooka design which was made from coax.
    [ Hits: 28569 | Votes: 4 | Rating: 2.00 ]
Antennas : 6M
  • Hex Beam for 6 meters - This is a hex beam designed for six meters. It has three elements with a turning radius of 54 inches. This antenna can be built from low cost materials available from the local hardware store. By WB3BEL
    [ Hits: 3285 | Votes: 4 | Rating: 6.25 ]
Antennas : Antenna Calculators
  • C-Pole antenna calculator - Based on the original design by Brian Cake, KF2YN this online calculator let you find the correct dimensions for a cpole antenna
    [ Hits: 2802 | Votes: 4 | Rating: 3.25 ]
  • Small Transmitting Loop Antenna Calculator Priority listing - A free online calculator for making all of the calculations required to design and build small transmitting loop antennas, also known as magnetic loops by 66pacific.com
    [ Hits: 4211 | Votes: 13 | Rating: 8.08 ]
Antennas : Feed Lines
  • L Match ATU for QRP - The L match is designed for the matching of random and long wires and should not be mounted in a metallic box/case, i used a small plastic food container which was the most expensive part of the project.
    [ Hits: 4478 | Votes: 7 | Rating: 7.00 ]
  • Balanced Self Matching Feed Line System - KE4UYP designed this Balanced Self Matching Feed Line System for people who want the very best feed line they can have on a Monobanded antenna
    [ Hits: 1140 | Votes: 0 | Rating: 0.00 ]
Antennas : Multiband
  • WARC 24 18 - 3 element Yagi Antenna - An old project by I1VCF for a 3 element yagi antenna originally designed for 10/15/20 and extended to 24 and 18 Mhz in Italian
    [ Hits: 1679 | Votes: 1 | Rating: 1.00 ]
Antennas : Receiving
  • Bicone antenna - This antenna is a simple double bowtie biconical dipole design. It was designed as a broadband scanner antenna resonant on the 2 meter ham band.
    [ Hits: 2233 | Votes: 1 | Rating: 8.00 ]
Antennas : Vertical
  • 160 80 40 Meter Vertical Array - A 6-element vertical array which is designed for 40 and 80 meter operation, and receive-only operation on 160 meters by W8WWV
    [ Hits: 1922 | Votes: 2 | Rating: 7.00 ]
Manufacturers : Alternative Power : Solar Panels
  • SolarVolt Power - Solar power products for the true environmentalist Solar energy systems, design engineering Residential and Commercial
    [ Hits: 160 | Votes: 0 | Rating: 0.00 ]
Manufacturers : Antenna Masts and Mounts
  • Super Bertha - Superbertha is an aesthetic, rotating monopole, custom designed and built specifically to fit your needs. a superbertha can be designed to any height you need or desire. there are many benefits of a superbertha, versus a standard guyed tower.
    [ Hits: 2071 | Votes: 2 | Rating: 5.00 ]
Manufacturers : Antenna Parts : Aluminium Tubing
  • Alfiniti Aluminium products - Custom assemblies, complex products, versatile applications… no matter what your challenge, we can design a solution for it.
    [ Hits: 615 | Votes: 1 | Rating: 10.00 ]
Manufacturers : Antenna Parts : Fiberglass tubing
  • Cleveflex - Clevaflex is a manufacturer of flexible wound tubing that can be used in a variety of applications. our unique manufacturing process allows tubes to be designed and built with a multi-ply convoluted wall contour that creates a permanently bonded tube.
    [ Hits: 589 | Votes: 0 | Rating: 0.00 ]
Publications : RF Foundamentals
  • Phase Noise. - This is perhaps the most important parameter in many oscillators and it deserves an in-depth discussion on what it is, how it affects a system and how it can be minimised in an oscillator design.
    [ Hits: 307 | Votes: 0 | Rating: 0.00 ]
  • RF Circuit design basics - Ebook by Akira Matsuzawa Tokyo Institute of Technology, Building blocks in RF system and basic performances, Device characteristics in RF application , Low noise amplifier design, Mixer design and Oscillator design
    [ Hits: 825 | Votes: 1 | Rating: 1.00 ]
Shopping and Services : Alternative Power
  • Wire Free Direct LtD - UK company that's a full-line dealer for wind and solar power systems, plus system design.
    [ Hits: 208 | Votes: 0 | Rating: 0.00 ]
Software : DSP
  • NBEMS - The Narrow Band Emergency Messaging System (NBEMS) for Windows is a suite of software programs designed for point-to-point, fast, error-free, emergency messaging up to or over 100 miles distant, and takes up a very minimum of frequency space on the ham bands, leaving more space for other ham activites.
    [ Hits: 943 | Votes: 1 | Rating: 10.00 ]
Technical Reference : Alternative Power
  • Free Sun Power - Free basic and advanced system design tutorials for every component and aspect of solar power. Plus system sizing calculators, battery bank calculators and wire size calculators
    [ Hits: 659 | Votes: 2 | Rating: 6.00 ]
Technical Reference : Amplifiers
  • TANKIT Priority listing - A free design aid for vacuum tube linear RF power amplifiers. Determine plate circuit operating parameters and design pi or pi-L tanks quickly and easily.
    [ Hits: 1635 | Votes: 1 | Rating: 10.00 ]
Technical Reference : Components : Toroids
  • Inductor Design Software - RF toroid - A free too designed to assist in the selection of iron and alloy powder cores. RF toroid calculate the location of the Self resonate frequencies for series and shunt inductors.
    [ Hits: 4695 | Votes: 39 | Rating: 4.59 ]
Technical Reference : Filters
  • 500 KHz Low Pass Filter - This article describes a shielded low pass filter with a cut off frequency of about 500 KHz. It is built with components suitable for receiving, and was designed to use in front of a low frequency receiver for LOWFER work.
    [ Hits: 916 | Votes: 8 | Rating: 3.00 ]
Technical Reference : Morse Keys
  • RF Actuated Keying Monitor - Battery-powered monitor designed to provide an audible indication of keying for those whose rigs lack a CW sidetone
    [ Hits: 156 | Votes: 0 | Rating: 0.00 ]
Technical Reference : Repeater
  • A reliable VOX PTT circuit - This VOX PTT has been designed with Echolink in mind, but it will work equaly as well with repeaters
    [ Hits: 1195 | Votes: 1 | Rating: 1.00 ]
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