SARLNEWS: AMATEUR RADIO TODAY - listen to these programmes on line or download to retransmit on local nets, a SARL service to Radio Amateurs.
Sunday 26 March 2017
SARLNUUS met Anette Jacobs ZR6D luister/laaiaf hier
SARLNEWS with Dave Reece ZS1DFR download/listen here
AMATEUR RADIO TODAY with Dawie Conradie ZR6DHC download/listen here or visit the Amateur Radio Today page with more details and download links here
POTENT CORONAL HOLE FACES EARTH: A canyon-shaped hole in the sun's atmosphere is facing Earth, and it is spewing a stream of fast-moving solar wind toward our planet. NASA's Solar Dynamics Observatory photographed the giant fissure on March 25th:
This is a "coronal hole" (CH) -- a vast region where the sun's magnetic field opens up and allows solar wind to escape. A gaseous stream flowing from this coronal hole is expected to reach our planet on during the late hours of March 27th and could spark moderately-strong G2-class geomagnetic storms around the poles on March 28th or 29th.
We've seen this coronal hole before. In early March, it lashed Earth's magnetic field with a fast-moving stream that sparked several consecutive days of intense auroras around the poles. The coronal hole is potent because it is spewing solar wind threaded with "negative polarity" magnetic fields. Such fields do a good job connecting to Earth's magnetosphere and energizing geomagnetic storms.
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
SARL TO HOLD WORKSHOP ON THE RISING RF NOISE FLOOR - Recently, following a concern raised by the South African Radio League at the SABS TC73 meeting, it was agreed that the question of the increasing level of the RF noise floor should be included in the Strategic Business Plan of the technical committee and added to the work schedule of Working Group 6.
Noise in this context denotes unwanted radio frequency (RF) energy from man-made sources. Like many spectrum users, Radio Amateurs have reported that the noise floor in the radio spectrum is rising as the number of devices in use that emit radio energy grows. However, in search for concrete evidence of an increased noise floors, it appears that only limited quantitative data to support this presumption is available.
The SARL is convening a Saturday morning workshop on 22 April 09:30 - 12:30 to develop a coordinated programme and form a study gro p with the objective of establishing a monitoring system to assemble more information while also considering mtigation methods to deal with manmade noise affecting amateur radio frequencies.
This will be an open meeting and everyone who has an interest in the subject is invited to attend. The workshop will be held at the NARC. If you have a special interest, expertise or experience in this field please share this at the workshop. For more details please email email@example.com with your contact details. Register now get form here
HAVE YOU PAID YOUR LICENCE?- You are advised to make sure that you have paid your amateur radio license for this year. If not it is recommended that you do it without delay. ICASA is not obliged to send out statements, the onus is on the license holder. If you have not paid for the 2016/2017 year, pay R559 and you are covered for this year and the next 4 years with no increases. The fee for the current 2016/2017 year is R134. Advise Dewald at DKuhrau@icasa.org.za of your payment for a five year license.
ICASA is in the process of implementing an ICASA Council decision to cancel all licenses that are not renewed within 30 days of 1 April. While still in the implementation planning stage make sure you have paid this year’s licence fee. Failing do so 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.
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.
SDR workshop in Cape Town on 22 APRIL - Following on a very successful symposium on Software Defined Radio held in Gauteng towards the end of last year a similar event will be presented by AMSAT SA in the Cape on Saturday 22 April 2017 at the Bellville Campus of the Cape Peninsula University of Technology. Register now here
The programme includes topics relevant to amateur radio, and will provide some background on SDR. A practical approach of how to use readily available dongles in conjunction with your PC to set up a receiving system operational from the low MHz frequencies up to nearly 2GHz. will be described. (Pic shows Andre ZS1F signing up)
To give attendees an insight into the development of such systems some of the software available to perform this task will be demonstrated. Hardware availability suitable for the development of embedded systems required for standalone transmitters and receivers will be introduced.
Looking at the rapid development of radio communication, and the future challenges within this field of technology, it is of importance for young as well as established Radio Amateurs to keep abreast thereof. More details and registration form soon
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 .
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