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.
Category Archives: 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.
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
Tuning Dipoles
Shortening wires, or adding length to wire antennas. A simple method to calculate length.
IW5EDI/7 portable operation report
Report of my recent operation in portable operation using a Yaesy FT-857D and an end-fed antenna.
Double Bazooka Antenna for 40 meters
Planning to setup a double bazooka antenna for 7 MHz during next months to verify performance of the Gap Titan DX on that band. I feel like the GAP is not so well performing on that band and I’m goint to setup for the CW portion of the 40 meters. This is the basic schema