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This could open up a vast field in VHF experiments, which could be of great benefit for their southern neighbours in the RSA. Get your weekly copy of HF Happenings at www. Specialised welding of steel, stainless steel, aluminium and cast iron. Tutorial 6 — Aircraft Scatter Propagation.

Get your weekly copy of HF Happenings at www. There's no danger to people on Earth, however, because our atmosphere protects us, intercepting the rain of particles. It is known that an aircraft flying at a high altitude, when at the midpoint of two distant VHF stations, can reflect signals between each other over a distance of about km for up to a minute or so. There are two regular schedule times as follows: March , Starts:

NASA and European spacecraft have been detecting these cracks for years. Small ones are about the size of California, and many are wider than the entire planet. While the cracks are open, magnetic fields on Earth are connected to those on the sun. Theoretically, it would be possible to pick a magnetic field line on terra firma and follow it all the way back to the solar surface.

There's no danger to people on Earth, however, because our atmosphere protects us, intercepting the rain of particles. The afterglow of this shielding action is called the "aurora borealis. Sunday 11 March It was co-authored by and Dr.

This article provides information on recent developments in policy formulation for TV whitespace wideband networks in South Africa as a solution for the ever-increasing demand for additional radio spectrum.

Go to the Members Only section of the web site to get all the information. Although there is a lot of construction information available on the internet, a commercial model is now available with limited information. The commercial version will be formally tested later in the year at the National Test Range. If you have any information to assist with the test project, please contact L.

Linde boom on or e-mail to boom paardefontein. Each chapter has been authored and edited by experts in t he subject. This edition is the most comprehensive revision since the edition. Only 5 copies available. Amateur Radio License fee increase. The new fees will be. Radio Amateurs are reminded that it is their responsibility to ensure their license is up to date.

If for some reason no invoice is received, check that ICASA has been informed of any address changes. Avoid the hassles of having to renew each year, opt for a multi-year licence. Simply, when renewing pay the appropriate amount.

On the EFT state 5 Year licence and your callsign. It is a source of information for readers. Commercial Hamad on home page - R60 pm - R for 6 months - R per annum. All contract advertisements content may be changed monthly on 5 working day notice. The rates are based on the complete supply of material in Jpeg unless otherwise negotiated. For artwork additional charges may apply as agreed. The content of the advertisements must comply with regulations and norms acceptable in South Africa.

Get your weekly copy of HF Happenings at www. Farewell Weekend from Z60A. Beverages have been built for the US and Japan. They are using a local cell site tower as their supporting structure. The trio will have two signals on the air throughout the next three nights on , 80, 40 and 30 m. In addition, they will still penetrate the 20 m openings above 14 KHz. On Tuesday 13 March, the group at Z60A will start taking apart their two sites, while the towers and beams will soon be in use with the locals.

This first radio activity of the Mission Goodwill Kosovo will soon be history. The QSL design is in the works, and cards should start coming out by mid-April. Celebrating the th anniversary since the proclamation of the Republic of Austria, Austrian amateurs may replace their current prefix with OE from 11 March to 13 November.

The St Patrick's Day on the air event will run from They will be active on 40 to 10 metres. QSL via home calls. Tutorial 6 — Aircraft Scatter Propagation. It is known that an aircraft flying at a high altitude, when at the midpoint of two distant VHF stations, can reflect signals between each other over a distance of about km for up to a minute or so.

There are daily many trans-continental passenger planes flying to Europe over Africa or the return trip. Try and obtain a flight chart of these Trans-continental flights, and determine when the midpoint of any of these aircraft will occur between your station and a distant station you would like to work.

Transmit or listen ten minutes or so before and up to ten minutes after the midpoint is reached. A better idea is to get the distant station to run a beacon transmitter and this way you could monitor all the flights throughout the day and alert other stations of the beacon signals. Whenever a plane crossed the midpoint somewhere near the Orange River, then a trace of the beacon signal would appear on the WSJT waterfall and on occasions also via audio.

The distance between Krugersdorp and Port Elizabeth is km. Next week we will take a look at Satellite Communication. This could open up a vast field in VHF experiments, which could be of great benefit for their southern neighbours in the RSA. Many of the radio amateurs in the African States own HF transceivers that are already equipped for operation on 50 MHz. In those countries with FM repeaters on MHz amateurs will be able to operate on this band, but if the transceiver is not all-mode then you will have to acquire a SSB rig for future long distance experiments.

The 50 MHz band, or Magic band, produces the strongest signals over the entire radio spectrum on most propagation modes. On MHz you could record the longest distances via Tropo Ducting along the African coasts or even inland. There were no stars or galaxies, and the Universe was filled primarily with neutral hydrogen gas. Then, for the next million years, gravity slowly pulled the densest regions of gas together until ultimately the gas collapsed in some places to form the first stars.

The signals detected by the radio spectrometer in this study came from primordial hydrogen gas that filled the young universe and existed between all the stars and galaxies. These signals hold a wealth of information that opens a new window on how early stars - and later, black holes, and galaxies - formed and evolved. The results of this experiment confirm the general theoretical expectations of when the first stars formed and the most basic properties of early stars.

It's causing hydrogen to start absorbing the background radiation, so you start seeing it in silhouette, at particular radio frequencies. This is the first real signal that stars are starting to form, and starting to affect the medium around them. The contest is open to all radio amateurs in Southern Africa. RST report and your grid square first 4 digits e.

See Blue Book for more info. Date and Contest Period: First full weekend in March March , DX stations send signal report and power number or abbreviation indicating approximate transmitter output power.

UBA Spring Contest Personally I was surprised by the amount of emotion in the South Africans, myself included. I can just offer my thanks for having been alive and living in South Africa to share in part Welcome to Let's Meet, the 1 free South African dating site!

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Researchers have long known that during weeks around equinoxes fissures form in Earth's magnetosphere.

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To provide opportunities for Amateurs to activate and work new grid squares. Click here for more information It was co-authored by and Dr.

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So if you have ever dreamed of being spoiled best south african dating website a Sugar Mommythis is definitely the right place to hook up with one. S, partially cancel one another, weakening our planet's magnetic defenses. The contest is open to all radio amateurs in Southern Africa. A better idea is to get the distant station to run a beacon transmitter and this way you could monitor all the flights throughout the day and alert other stations of the beacon signals. They will be active on 40 to 10 metres.