K5SO published an article in which he reported measurements of Sun noise rise over cold sky for K5SO, W2UHI and VK7MO.
Above is his graphical summary of the measurements. Continue reading Mining K5SO’s measurements of Sun noise
Category: Antennas
Measuring G/T
This article explains how to measure G/T using the Sun. Continue reading Measuring G/T
Checkout of EMRCalc quiet solar flux report
EMRCalc v9.09 contains a facility to fetch a current report of quiet solar flux from an online source.
Above is a sample report. Continue reading Checkout of EMRCalc quiet solar flux report
EME path calculation based on G/T
A correspondent asked if it was possible to calculate the link budget for an JT65 EME path using the G/T worksheet at (Duffy 2014). Continue reading EME path calculation based on G/T
G/T spreadsheet update (v1.09)
For those who may have used or want to use my G/T spreadsheet tool I have discovered a defect in one cell’s formula. Continue reading G/T spreadsheet update (v1.09)
Galvanised steel wire OCF dipole
I was chatting on the weekend with a new ham who was inspired by an article in Amateur Radio to build an OCF dipole using galvanised fence wire.
I have not seen the article, but he recalled that it recommended single core 1.25mm galvanised wire as quite suited to the task of an 80m OCF dipole. The wire consists of a mild steel core with a thin layer of zinc. Continue reading Galvanised steel wire OCF dipole
Trying to make sense of the VE7BQH Yagi performance tables
VE7BQH publishes a table of Yagi performance data derived from a number of modelling programmes. The table is often used as a definitive reference of the overall merit of an antenna by buyers, makers and students for their own situation.
This article is mainly motivated at better understanding the G/T column of the tables. Continue reading Trying to make sense of the VE7BQH Yagi performance tables
Assembling clamp type coax connectors
Folk often ask for instructions for assembly of so-called clamp type coax connectors.
This article shows such an N type connector, but the techniques are applicable to different connectors with the same type of cable / braid attachment. Continue reading Assembling clamp type coax connectors
Coax connectors and accurate / repeatable measurements
Much is written about the virtues of some types of coax connectors over others.
Continue reading Coax connectors and accurate / repeatable measurements
Feed point voltage – W5WSS 7′ dipole
Background
W5WSS describes his antenna at (eHam 2014). It is essentially a shortened dipole with capacity hats for 20m.
The configuration appears from several postings to be this shortened dipole with a Balun Designs 1115du balun at the center and an adjacent LDG Pro 200 automatic ATU.