This halo antenna by KB1DIGÂ is made with a true Gamma Section this time and is fashioned from aluminum. Most of the parts are leftovers from old car projects. The best part is it’s omnidirectional! The 3/8″ fuel-line I used came from Summit Racing Equipment: http://store.summitracing.com #SUM-G2538, and a 25′ section costs…
Author: Simone
Born in 1970 currently live in Florence Italy.
Married with 2 childrens work as IT Technician.
Notes on Cubic Quads
Cubic Quads KQ6RH (C) 1998, 1999, 2000 Ray Jurgens (Up-Dated 2/25/2000)  Cubic Quads  The cubic quad is a very popular way to get reasonably high gain and excellent front to back ratios as well as low angles of radiation for without going to extreme heights. Here I present several designs that that achieve…
5/8 Collinear antenna
5/8 VHF Collinear antenna
The ZS6BKW Multiband HF Antenna
This is the antenna for you guys who want to get on HF effectively, and haven’t too much space or cash to throw around. Actually, it’s a design from ZS6BKW (aka G0GSF), similar to the G5RV, but it actually resonates on five bands, (well 6, actually) and doesn’t rely on a tuner (ATU) to make…
Simple HF Baluns for 50/75 Ohm Systems
The following diagrams and tables show some simple 1:1 and 4:1 baluns for use between 1.8 and 30 MHz using twin transmission lines made from enamelled copper wire (ecw). The bifilar windings have been adjusted (spacing) to produce transmission lines with Zo of 50 or 75 ohms as required for best matching. These designs should…
Step-By-Step Construction of a 4:1 Current-Type Balun
Article by Charles Greene, W1CG My 4:1 current-type balun is wound on a FT-114-43 core. The FT-140-43 is a little easier to work with, and maybe the FT-140-77 would cover 160-10. This one is reasonably flat from 4.5 to 35 MHz but drops off a little at 3.5, 40-ohms with a 200 ohm resistor on…
HF Log Periodic Antenna
A plan for HF Log Periodic Antenna working 10-20 meters band by VA2PHI Pictures originally available at http://hb9tmw.free.fr/EuroNet/HTML/loghf.html
YOTA 2015 – trip to Florence
A visit to Florence by the Ham YOTA 2015 group
YOTA 2015 – II5YOTA
My recent visit to YOTA 2015
Modifying HP Server Power Supplies for Ham Radio Use
This article documents the modification of 2 typesof Hewlett Packard switching power supplies to enable their use as power sources for ham radio equipment. Obsolete server power modules can be bought from online dealers at very good prices due to the massive replacement of older network servers; typical prices for a unit are as low…