Loss of Wireman 553 windowed ladder line at MF/HF – does it matter

Loss of Wireman 553 windowed ladder line at MF/HF discussed the matched line loss of a windowed ladder line with 19 strand CCS conductors. Above, the loss curves from the article You might look at this and ask “does it matter”, if 10m of this line is used in a G5RV, 0.0075dB/m at 3.6MHz gives … Continue reading Loss of Wireman 553 windowed ladder line at MF/HF – does it matter

ATU voltage verification

I described a method for designing antenna systems to avoid excessive voltages in baluns and ATUs at (Duffy 2011) . This article reports post implementation measurements of an antenna system designed using that method and using a G5RV Inverted V with tuned feeder and ATR-30 ATU with integral 1:1 current balun. The tuned feeder is … Continue reading ATU voltage verification

A look at internal losses in a typical ATU

This article explores the loss that may be encountered in an ATU in a practical setting. The load is a G5RV with tuned feeders operating at 3.6MHz. The tuned feeder is 9m of open wire line of characteristic impedance 450Ω, and the impedance seen by the ATU is around 40-j150Ω, this is not a particularly … Continue reading A look at internal losses in a typical ATU

An inexpensive medium power tuner current balun for HF using Jaycar parts

This is a project to design and build a Guanella 1:1 (current) balun suited for up to 100W on HF with wire antennas and an ATU. For use with a tuner, the most important design criteria are: high voltage withstand; high common mode impedance; power handling. Last update: 11th March, 2024, 7:03 AM

Design / build project: Guanella 1:1 ‘tuner balun for HF’ – #3

Third part in the series..   Design / build project: Guanella 1:1 ‘tuner balun’ for HF – #1 Design / build project: Guanella 1:1 ‘tuner balun’ for HF – #2 Design / build project: Guanella 1:1 ‘tuner balun for HF’ – #3 Design / build project: Guanella 1:1 ‘tuner balun for HF’ – #4 Design … Continue reading Design / build project: Guanella 1:1 ‘tuner balun for HF’ – #3

A/B comparison test on 40m

An extended test comparing signals received in Florida from three nearby stations in Australia was conducted 21/12/13, a low elevation path of more than 14,000km. The A/B comparisons were performed on statistics gathered from the W4HBK grabber, in this case measurements of the noise and each of two transmissions of 1min of steady carrier every … Continue reading A/B comparison test on 40m