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12 May 2019
Amateur Radio Today is
Mondays 18:30 CAT
Membership/Renewal application form
SA AMSAT EZINE
To request a trial copy send your email address here with trial copy in the subject line
*Denotes that the person has made several donations over time. Thank you
Marinus Brand ZS6BM
Ronald Verweerdt ZS6RVC
AMSAT SA AND SARL JOINT RF NOISE WORKSHOP
Saturday 23 November 2019
HF and VHF noise monitoring workshop covering how to set up a system, antenna discussion, great dongle applications, hands on activity and more.
Download programme here
Order form here
AMSAT SA Dual Band Yagi now available
FOR EXPORT IF ORDERED IN BATCHES OF 6 UNITS
Following requests from many amateurs outside South Africa we can offer the yagi for export if ordered in a batch of 6, at R950 each (approx US $65), total for a batch of 6 R5700. (approx US $ 390). Available to countries in the European Union and the USA.
For Australia and New Zealand R1000 per unit in a batch of 6 total R R6000.
Other countries on request.
For South Africa: Members of SA AMSATSA /SARL R350, non members R450.
The antenna has a 50-ohm designed driver. The Yagi has a unique element called a ‘Open Sleeve’ which is a director very close to the driven element. The driven element is sized for 2M. When operating on 70cm the ‘Open Sleeve’ acts as part of the driven element on 70cm (Third harmonic of 2M).
The original concept was developed in 1946 by Dr J T Bolljahn of the Stanford Research institute but was not introduced into amateur radio until the 1950s. The AMSAT SA version is based on a design by DK7ZB with modifications by WB5CXC. More details and order form here. Order form for South Africa here
AMSAT SA introduces a new logo for AfricaCUBE
The downlink frequency is 10 489.550 to 10 489.800 MHz with the centre of the band being 10 489.675 MHz. Vertical polarization will be used.
The preferred modes of operation will be SSB and CW. 5 Watt uplink power to a 60 to 75 cm offset dish should be more than sufficient for the uplink. The transponder will also be fitted with a “LEILA” (LEIstungs Limit Anzeige) input power limiter to ensure fair play and that the AGC of the transponder is not triggered (hogged) by a single, high power transmission, thus reducing the sensitivity of the satellite. In short, running higher uplink power than necessary will be counterproductive,
A detailed paper was presented by Hannes Coetzee ZS6BZP at the 2018 AMSAT SA Space Symposium. Plans are being made to have a live demonstration at the 2019 AMSAT SA Space Symposium on 16 March 2019. Down the ZS6BZP paper here.
An SDR CUBESAT ON THE CARDS
Partial populated transponder board
AMSAT SA has announced that parallel to its analogue Kletskous CubeSat, the group is working on a digital project featuring a Software defined transponder. Called AfriCUBE, the CubeSat will use the same space frame as KLETSKOUS . Anton Janovsky is current building a prototype transponder. AMSATSA is inviting persons interested in becoming part of the development team to send their details to .
Meanwhile the development and final construction of the AMSAT SA KLETSKOUS is plagued by electronic component obsolescence. This forces unwanted design changes to be made to ensure that when the time comes to construct the final launch unit, the main components are still available.
The KLETSKOUS team decided to freeze the design of KLETSKOUS and purchase a quantity of devices to proactively mitigate future obsolesce. This decision will also speed up the process of putting a final satellite on the table. “Every time we change designs to mitigate for the discontinued components, it is like starting the design a fresh, often creating new problems that have to be solved”, Hannes Coetzee, ZS6BZP said. “By freezing the design, in other words making a final decision on the main specialised devices to be used, we will be able to speed up the process of putting a flight ready unit on the table.”
KLETSKOUS is not a textbook design. Most of the sub-components that will make up KLETSKOUS are designed and being built by the volunteer team. “We do not have the finances to go out and purchase sub-units and simply wire them up.”, Coetzee said.
AMSAT SA SPACE SYMPOSIUM 2020 First call for papers
Amateur Radio in Space – exploring VHF, UHF and Microwaves
Papers are invited for presentation at the conference and publication on the web. Please send your synopsis by 31 January 2020 in a word document of no more than 300 words to firstname.lastname@example.org.
Please tell us if you will be available to present your paper at the conference.Speakers attend free.
DATE: 18 July 2020
Venue: Premier Hotel Midrand
More Kletskous Progress
A flight-ready solar panel for Kletskous.
The solar cells are glued to the PC board using conductive silver epoxy. This is done under vacuum to prevent bubbles being formed in the epoxy. Bubbles may burst in the vacuum of space, fracturing the paper thin glass solar cell and destroying it in the process.
Become a partner in space
Donate to the AMSAT SA Kletskous fund and become a partner in space
Please make your contribution. You may pay directly into our account electronically. Please send the payment details with your name, callsign, email and postal address to email@example.com.
All contributions will be acknowledged on this page (Scroll down). Donations of R500 or more will be acknowledged with a certificate.
AMSAT SA, ABSA Menlyn, Branch code 632 005
RS, the component supplier in South Africa has become
a component sponsor for the KLETSkous project.
TRAX SPONSOR PCBs for KLETSkous More about TRAX
Avnet : a broad line supplier of semiconductors, passives, magnetics, enclosures, optoelectronic, GPS / GSM, interconnect, electromechanical, embedded products and components