Two SA CubSats sucessfully launched to the ISS -The South African satellite industry has taking another step forward as a player in the international space arena with the launch of two South African built nanosatellites from Cape Canaveral in Florida USA.
Two CubeSats, ‘nSight1’ designed and manufactured by Cape Town-based SCS Space, a member of the SCS Aerospace Group and ‘ZA-Aerosat’ designed and manufactured by CubeSpace of the Stellenbosch University, have been launched as part of a batch totaling 28 CubeSat from 23 different countries. For full story click here
SARLNEWS: AMATEUR RADIO TODAY - listen to these programmes on line or download to retransmit on local nets, a SARL service to Radio Amateurs.
Sunday 23 April 2017
SARLNUUS met Dawie Conradie ZR6DHC luister/laai hier af
SARLNEWS with Dennis Green ZS4BS download/listen here
AMATEUR RADIO TODAY with Dawie Conradie ZR6DHC, listen here or visit the Amateur Radio Today page with more details and download links here
AIRCRAFT SCATTER CAN PROVIDE DAILY LONG DISTANCE CONTACTS – The longest distance ever recorded in the USA of radio reflection from Aircraft is 1300 km. Normally two-way contacts on Aircraft Scatter are around distances of 800 km. The Krugersdorp ZS6JON beacon on 50,050 MHz CW has regularly been observed on the WSJT waterfall in Port Elizabeth over a distance of 900 km, whenever a plane travelling from PE to JHB crossed the midpoint north of the Orange River. On a few occasions a plane flying from West/East produced an Aircraft Scatter signal from Krugersdorp and when it started to fade out, while at the same time a signal began to fade in on the ZS6TWB beacon on 50,044 MHz CW from Polokwane, 1178 km from Port Elizabeth. The VK’s suggested that Aircraft Scatter from high flying aircraft at 43 000 ft (about 13000 metres) could on occasions be enhanced by high elevation Tropo Ducting and extend the total range by several hundred kilometres. This could explain the record-breaking contact on 50 MHz digital via Aircraft Scatter, which was established over a distance of 1290 km by ZS1AX and ZS6OB during a PEARS VHF/UHF contest. At that time of day there were many planes flying on the flight path between Cape Town and Johannesburg, and there were a minimum number of minor meteors around. Aircraft Scatter is another mode that radio amateurs could explore especially during the approaching winter months. (article by ZS2FM)
EXPLOSION ON THE SUN: On April 23rd around 0500 UT, a dark filament of magnetism on the sun exploded. See the movie from NASA's Solar Dynamics Observatory. An analysis is underway to determine if any portion of the debris is heading for Earth. Stay tuned. A solar wind storm is underway around Earth as our planet enters a high-speed stream of gas flowing from a large hole in the sun's atmosphere. NASA's Solar Dynamics Observatory photographed the source of the wind on April 23rd:
This is a coronal hole (CH)--a place in the sun's atmosphere where the magnetic field peels back and allows solar wind to escape. Solar wind flowing from this hole is moving faster than 700 km/s--a veritable gale. Moreover, the wind is threaded with "negative polarity" magnetic fields. Such fields do a good job connecting to Earth's magnetosphere and energizing geomagnetic storms.
NOAA forecasters estimate a 80% chance of polar geomagnetic storms on April 23rd subsiding to 'only' 60% to 65% on April 24th and 25th as Earth moves through this potent stream of solar wind. High-latitude sky watchers should remain alert for auroras.
National Convention and AGM: SARL members can download all the AGM document from the members only pages on the members only button on the top right of this page and enter your pin number.
Update your e-mail address - Kelley at the NARC asks that SARL Members will check and update their e-mail address. Kelley receives about 55 bounced e-mails each time a SARL Communication is sent out.
Go to your call book entry and update that e-mail address today!
PAY YOUR AMATEUR RADIO LICENCE NOW - Your 2017/2018 licence is payable on 1 April 2017. The fee is R134.00. The fee is for 5 years is R559.00. Advise Dewald at DKuhrau@icasa.org.za of your payment for a five year license.
ICASA is not oblighed to send out invoices. When paying your licence by EFT or at the Post Office please use your licence number and callsign as reference. Send the payment advice to the following two addresses Specrev@icasa.org.za and copy to Speclicensing@icasa.org.za. The ICASA bank details are as follows: ICASA, Nedbank,
Branch code: 146 245, account number 1462002927
ICASA automatically cancels all licenses that are not renewed within 30 days of 1 April. Failing to pay in time will mean that you may have to apply for a new license. You may just find that some else has applied and obtained your callsign.
NVIS PROPAGATION - UNDERSTAND THE BASICS - Radio Communication via Near Vertical Incidence Skywave propagation can be used for communication over a wide area. It is very well suited for emergency communication. It uses frequencies between 3 and 10 MHz with amateur allocation in the 5 MHz particularly attractive. Two propagation researchers, Ben Witvliet and Rosa Ma Alsina-Pages wrote an interesting paper with lots of reference to other papers for additional reading.
You can download it here
4 Bursaries available for under 26 to study for class A - If you are under 26 and planning to study for the Class A amateur radio examination there are bursaries available.. For more detail and application forms click here.
RSGB HANDBOOK NOW AVAILABLE IN SA- The new RSGB Radio Communication Handbook is now avaiable in South Africa. Also available are the ARRL 2017 Handbook (hardcover version) and Low Band DXing. For a list of books locally stocked and a mailorder from click here. SARL Members get up to 10% discount .
Advertising in Radio ZS and the SARL Web site
Radio ZS and the SARL web welcomes advertising. It is a source of information for readers. To place an advertisement in Radio ZS, contact Dennis, ZS4BS, at email@example.com. To advertise on the League web site, contact Hans, ZS6AKV at firstname.lastname@example.org
Display (cameo) on home page - R500 pm - R2 500 for 6 months - R4 500 per annum
Commercial Hamad on home page - R60 pm - R300 for 6 months - R500 per annum
Radio ZS Strip advertisement, 10 cm x 2 columns on top of the page - R100 pm - R500 for 6 months - R1 000 per annum
Display (cameo) on home page and Radio ZS Strip advertisement (as above) - R550 pm - R2 700 for 6 months - R4 900 per annum
Terms and conditions
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
All advertisements are playable in advance by EFT to SA Radio League, ABSA, account no 4071 588 849 branch code 632 005
All correspondence and material must be sent to email@example.com with a copy to firstname.lastname@example.org