Amateur radio equipment reviews. Based on my direct experience or taken from other sources
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
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 VHF Collinear 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
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
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
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
A magnetic loop for 40 meters band
