Australia's Largest range of Electronic Kits and Components for the Radio Experimenter

ANTENNA MAKING SUPPLIES/ DOG BONE INSULATORS AND STAINLESS ANTENNA WIRE CLIPS. End-fed half wave antennas EHHW

Archives of Ham Radio Magazine

A variety of new and used vintage and hard to find radio components for home brew projects including:

List of Broadcast, Fixed Broadcast, Studio-Transmitter Links (Feeders), Remote Pickup & Relay stations 25 - 87.5 MHz.

Figure R3 of 47 CFR 73.190 of the Commission’s Rules contains a map of the estimated effective ground conductivity in the United States. This data is used to predict the propagation of AM signals across the United States. A higher ground conductivity indicates better AM propagation characteristics. The map shows that the ground conductivity in the U.S. ranges between 0.5 and 30 millimhos (or millisiemens) per meter. The conductivity of seawater is 5,000 millimhos per meter, resulting in the best propagation of AM signals.

Figure R3 of 47 CFR 73.190 of the Commission’s Rules contains a map of the estimated effective ground conductivity in the United States. This data is used to predict the propagation of AM signals across the United States. A higher ground conductivity indicates better AM propagation characteristics. The map shows that the ground conductivity in the U.S. ranges between 0.5 and 30 millimhos (or millisiemens) per meter. The conductivity of seawater is 5,000 millimhos per meter, resulting in the best propagation of AM signals.

I make no claims for technical accuracy, good design, or necessarily even originality for the contents of these pages. Rather, I am a simple enthusiast attempting to convey my love and enjoyment of radio, electronics, and computing and perhaps to inspire YOU to build something too. The following pages document projects that I have built over a period of 30 years. Wherever applicable I have named sources and references.

Radio Hobbyist’s Designbook or RHdb (for short) was designed to guide you into design of
electronics apparatus that relates to radio. It assumes you know something about electronics
but you can skip Chapters which cover familiar subjects. Mathematics needed in design is down
to simple algebra and trigonometry. Topics cover the frequency spectrum of DC through VHF.

You must supply the brainpower. But RHdb can be your main reference, a guidance toreaching
your personal hobby goal. RHdb is written in a sort of Reader’s Digest format: Short and
to-the-point, covering things simply with a minimum of words. Grouping is in 5 sections as
givenbelow with a synopsis of Chapters

The original AirBoss was made by my Grandfather (KR4LO) in order to help ham radio operators deploy their antennas over tall trees. I, the Grandson, have taken over the production of the AirBoss. Olah Technologies LLC will continue to bring you the AirBoss and other innovations.

WORLDWIDE DX CLUB "Top News", compiled by Wolfgang Bueschel