hi tech

hi tech

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• Building a CobWebb Antenna - Homebrew a cobwebb antenna for the HF bands. This page describe a cobwebb multiband antenna resonating on 14 18 21 24 and 28 MHz. The cobweb antenna model can be considered a fan dipole, or better, multiple dipoles fed in parallel.
  [ Hits: 1495 | Votes: 6 | Rating: 7.17 ]

• The KL3JM modified SRI Fan Dipole for 80-40-20 Meters - The antenna in this project is a modification of the techniques used to design a multiband fan type dipole with little or no tuning involved having a total space of 105 feet
  [ Hits: 502 | Votes: 1 | Rating: 5 ]

• 4 Square vertical system - This page is a short description of the four phased verticals system for 160m 80m and 40m
  [ Hits: 542 | Votes: 0 | Rating: 0 ]

• How to straighten Microbore copper tube - Article and video showing a technique to straighten Microbore copper pipe that is useful in antenna construction. This technique has been implemented to build a Quadrifiliar Helix antenna.
  [ Hits: 326 | Votes: 0 | Rating: 0 ]

• DIY NVIS Antenna Using a Mag Mount - NVIS antennas, also known as Near Incident Vertical Skywave antennas have a high angle of radiation. Something on the order of 60 degrees, to straight up to 90 degrees. A portable, easy to setup and cheap nvis antenna project.
  [ Hits: 652 | Votes: 4 | Rating: 5 ]

• Two Radio Contesting Tutorial - This is an explanation of the intended way to use TR LOG with two radios in the ARRL November Sweepestakes, CW. The concepts and techniques presented here can work for you in other contests, as most of the ideas are the same.
  [ Hits: 192 | Votes: 0 | Rating: 0 ]

• LB3HC's hightech blog - LB3HC's hightech blog - Amateur radio, RF design, electronics, uC, software, Arduino, AVR, Antennas
  [ Hits: 186 | Votes: 0 | Rating: 0 ]

• ASELSAN - Established in 1975, ASELSAN, has become a high technology, multi-product establishment by introducing state-of-the-art products and systems solutions for both military and professional applications.
  [ Hits: 328 | Votes: 1 | Rating: 10 ]

• CET Technology - Manufactures Flyback, Switching, Audio, Toroidal, Current Sense & Custom Trasformer, Drumcore & PFC Inductor, Common Mode Chokes.
  [ Hits: 136 | Votes: 0 | Rating: 0 ]

• A Beginners Guide to Repeaters - Mount Baker Amateur Radio Club present this guide with the hope that it will make using repeaters easier to understand and it will answer your questions without dwelling on the many technical details
  [ Hits: 267 | Votes: 0 | Rating: 0 ]

• Icom PW-1 band expansion mod - Enabling 10 and 12 meters band modification. This document explain how to do the modification to the PW1 in detail, with the aid of pictures & text
  [ Hits: 853 | Votes: 1 | Rating: 8 ]

• Coremax Technology - Professional Lithium-ion battery packs factory in Shenzhen China with more than 11 years experience in Battery business. Manufactured of Lithium ion and lithium polymer battery and Lithium battery packs.
  [ Hits: 156 | Votes: 1 | Rating: 5 ]

• 2 Amateur Radio Morse code practice keys Android App - Iambic and Straight key amateur ham radio CW Morse code practice oscillators for Android. This Android app gives you both straight and iambic CW Morse code practice key oscillators. Each key translates Morse code into English and CW prosigns in real time as you practice. Practice sending Morse code with a straight key oscillator. Settings include WPM, show/hide Morse code/text, choose sidetone 400Hz-800Hz. Adjust the WPM so that you can produce well formed DITs and DAHs at a comfortable speed.
  [ Hits: 351 | Votes: 4 | Rating: 10 ]

• iPhone DTMF Decoder - Decode DTMF from your iPhone. Hold your smartphone close to a DTMF source and this app will decode the numbers being dialled.
  [ Hits: 413 | Votes: 1 | Rating: 10 ]

• How to perfectly clean wires in minutes - Here is an old ham radio operators trick for cleaning wires for soldering that are old and corroded. It is hard to find this technique printed anywhere!
  [ Hits: 1343 | Votes: 5 | Rating: 7.8 ]

• Toroids - Some practical considerations - Are you confused when it comes to using toroids? The tips given in this article may simplify your next project. Comprehensive article about choosing the proper toroid.
  [ Hits: 356 | Votes: 2 | Rating: 10 ]

• The Old Radio Builder - This site is dedicated to those who enjoy building radios and other electronic devices using parts and techniques from bygone eras.
  [ Hits: 684 | Votes: 2 | Rating: 10 ]

• Yet Another Front End Saver - The KD9SV Front End Saver in a new fashion. If you use a separate receive antenna, you need a Front End Saver to eliminate the possibility of blowing out your receiver's front end while using an auxiliary receive antenna.
  [ Hits: 268 | Votes: 0 | Rating: 0 ]

• Cross Band Repeaters - Crossband Repeating is a process where a Ham transmits one signal on one band (typically UHF), and it is received by another radio with a better antenna/power installation, and re-transmitted (typically on VHF) to another radio system, or a repeater. Everyday examples of cross-band repeaters are repeater receive sites that hear the input signals on 2m and retransmit those signals on a frequency higher than 220 MHz.
  [ Hits: 207 | Votes: 0 | Rating: 0 ]

• Analyzing 6 handheld antennas with a VNA - In this article the author analyze six different type of VHF handheld antennas and as result of his self training on his new vector network analyzer published this interesting report
  [ Hits: 408 | Votes: 1 | Rating: 1 ]

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