describes a 1:1 balun. Introduction A cost effective current-mode 1:1 balun can be constructed from a length of coax and a rod typically used for a broadcast antenna loop-stick, some electrical tape, cable ties, a length of PVC water-pipe and some connectors. The balun is formed by winding several turns of coax on the ferrite…
Category: Articles
Here you can find articles I’ve cached, that are no more available in the net or are very rare to be found. Where possible credit will be given to authors.
Adjusting Straight Keys, Paddles, & Bugs
How to adjust a morse key, adjusting bencher, paddle, straight morse key.
G5RV All-Band HF Antenna
This article discusses the characteristics of a 102 ft. center-fed dipole antenna strung between two 37 ft. poles. It explores predicted feedpoint impedance variations across different frequencies and the corresponding impact on the VSWR for various feedlines, based on EZNEC antenna modeling software predictions. It also analyses how alterations in element lengths of antennas significantly affect their performance at higher frequencies.
Efficiency of the Z Match
Lloyd Butler VK5BR evaluated the power efficiency of various Z Match Tuner configurations across antenna load conditions, uncovering discrepancies in performance across different frequencies and load resistances.
T-MATCH ATU
C1 250pF or more C2 250pF or more L1 31 mH 39 turns, 2 Inches (51mm) Diameter, 4 Inches (102mm) long. Tapped at 20T, 14T, 9T, 5T L2 0.25 mH 4 turns 1.2 Inches (30.5mm) Diameter, 2 Inches long. I used silver plated copper wire for L1 and L2. If you use enamelled copper wire,…
A 3 Element Mono-band Yagi for 20 Meters
By Kees Wiegers, PA5CW (ex-PA3BHS) It looked impossible to get a large beam for 20 meters up a tower, but it was something I always wanted. So after attending a presentation by John Devoldere, ON4UN, of Merelbeke, Belgium, I decided to try and build my own beam. At the presentation, John demonstrated software for designing…
Dave’s Homemade Loop Antennas
homemade loop antenna or loop aerial pages by N2DS Dave
Dave’s Homemade Antenna Tuner
Article by Dave N2DS A tuner like this has appeared with some of my high performance radios, such as my #35 and #50 sets. This type of tuner has worked very well with the accompanying detector board to make a nice dx crystal radio. My aim was to put as much versatility into this tuner…
WSJT-X not decoding – Solved
Solving and issue with WSJT-X not decoding signals
Antenna Wire Launcher
Homebrew antenna wire launcher