AMSAT SA

Registered as a non-profit company

Registration 2016/111111/08

 

Follow AMSAT SA on FaceBook https://www.facebook.com/AmsatSA00/

 

 

AMSAT SA
P O Box 90438
Garsfontein 0042
South Africa
Tel:  012 991 4662

Email:
admin@amsatsa.org.za


Weekly satellite report 

12 May 2019

 

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Podcast: www.zs6ro.co.za/podcast


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SA AMSAT EZINE

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LEARN MORE ABOUT  AMSAT SA


DONORS
Deon Coetzee ZR1DE
Tobile Koni ZS6TKO
Jan van Rooyen ZR5JR
Pravin Ashok
Donald Jacobs ZS2BW
Ray Webber ZS6RSW
Tarries Brink  ZS6MNO*
Kempton Park  Amateur Radio Technical Society ZS6KTS
Paul Roos ZS6HQ*
Anton Janovsky ZR6AIC
Pine  Pienaar ZS6OB
Gert Botha ZS6GC
David Horne
Etienne Saayman ZS5EFS
Nic van Duffelen ZR6AEZ
Andre Rox ZS6ARX
Carl Wentzel ZS6CFW
Gert Kok
Gordon Prentice ZR6RA
Rassie Erasmus ZS1YT
Guy Eales ZS6GUY
Bert van der Ploeg ZS6VDP
Wally Watson
Rickus de Lange ZS4A
Kerverne Thurling ZS1ABU
Lem Melidonis ZS1LEM
Paul Johnson ZS1S
Martinus Grobbelaar
Michael Boast ZS5BGV
Francois Basson ZS6DGN
Robe Bareham ZS1SA
Thomas Ambrose  ZS1TA*
Craig Hardman ZS5CD
Ton van den Bon
Grant Dixon ZR6WTF
Rene Gouws ZR1RTG

Christo Pelser SA6BUQ
Marinus Brand ZS6MP
Hennie Rheeeder ZS6ALN

Ronald Verweerdt ZS6RVC
Neilen van Breda ZS6NG

 

*Denotes  that the person has made several donations over time. Thank you

New Members
November 2018

Marinus Brand ZS6BM

Ronald Verweerdt ZS6RVC

AMSAT SA AND SARL JOINT VHF WORKSHOP

Horizontal vs Vertical antenna polarisation – the debate

Attend the next joint SARL and AMSAT SA VHF workshop on 20 July 2019 and join the debate about Horizontal versus Vertical antenna polarisation for long distance VHF communication. The subject has for several years been surrounded by arguments that Vertical polarisation surpasses Horizontal Polarisation in achieving long distance communication on VHF with equal opposite arguments.

Dick Coates ZS6BUN has carried out extensive technical paper research and reviewed experiential data from world-wide resources and will present his findings and share his own experiences at the workshop.

Other discussions at the workshop include: Update on the Bethlehem and Karoo two metre beacon projects, the West Coast propagation phenomena, and three quick fire   10-minute sessions covering the Reverse beacon project, increasing levels of the HF noise floor a growing concern and why VHF and UHF have an important future in        Amateur Radio.

The workshop will be held at the SARL National Amateur Radio Centre from 08:30 and ends at 13:00.  Midmorning light refreshments will be served. The registration fee is R50 for SARL and AMSAT SA Members and R100 for non-members. To register click here for the form and here for the programme

 

AMSAT SA Dual Band Yagi now available

The first 200 were sold under an introductory offer. The price has increased to R300 for AMSATSA and SARL Members and R450 for non-members. The yagis are available again.

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.

Available for export with minimum 6 units in one shipment.. Ask for a quote for shipping to your destination.

Order and pay by EFT  and collect at the VHF workshop  at the NARC on 9 February 2019. No cash sales are available at the NARC


JO97 Launched and operational

On December 3rd, 2018, JY1Sat was launched on a Falcon 9 vehicle from Vandenberg Air Force Base in California. Part of Spaceflight’s

SSO-A: Smallsat Express launch, JY1Sat is a project of the Crown Prince Foundation of Jordan. Telemetry has been received and decoded around the world since the launch.

 It had been designated Jordan-OSCAR 97 (JO-97)

The telemetry downlink frequency is 145.840 MHz, this will use the usual FUNcube standard 1k2 BPSK format. The linear transponder, for Single Sideband (SSB) and CW modes, will downlink on 145.855-145.875 MHz and uplink on 435.100-435.120 MHz. The transponder is inverting so Lower Sideband (LSB) should be used on the uplink and Upper Sideband (USB) on the downlink.


 

Es'hail Sat launched successfully

SpaceX successfully launched the Es’hail-2 satellite on Thursday, November 15 from Launch Complex 39A (LC-39A) at NASA’s Kennedy Space Center in Florida. Liftoff occurred at 20:46 UTC, and the satellite was deployed to a geostationary transfer orbit (GTO) about 32 minutes after liftoff.


Built by Mitsubishi Electric Corp. and owned by Qatar’s national satellite communications company Es’hailSat, Es’hail 2 will provide television broadcasts, broadband connectivity and government services to Qatar and neighbouring parts of the Middle East, North Africa and Europe. Es’hail 2 also carries the first amateur radio payload to fly in geostationary orbit. Es’hail-2 will be “parked” 35 786 km above the equator at 25.5°East, nearly due North from Pretoria and Johannesburg (which are at 28°E).
 
 Es’hail-2’s footprint will cover a population of approximately 5.2 billion. This translates to more than 1.5 million Radio Amateurs in nearly 225 countries


Es’hail-2 Linear Amateur Radio Transponder


The published uplink frequency is 2 400.050 to
2 400.300 MHz with the centre of the band being
2 400.175 MHz. Total bandwidth is thus 250 kHz and right-hand circular polarization will be used.

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 admin@amsatsa.org.za.

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.


 


2019 AMSATSA Space Symposium 16 March 2019

Papers will be available soon. Click here


YOTA 2018

Software

SDR

Satellite Tracking

Mapping Software UI 32

CW/RTTY Decoder

Low speed telemetry Decoder

High speed telemetry Decoder

ISS slow scan TV

Audio link between applications

Presentations

Journey into SDR

KLETSKOUS

KLETSKOUS TRANSPONDER

KLETSKOUS MAGNETIC STABISATION

10GHz Beacon

Links to noise monitoring

Contesting

Digital Radio


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 kletskous@amsatsa.org.za.

All contributions will be acknowledged on this page (Scroll down). Donations of R500 or more will be acknowledged with a certificate.

Bank Details: AMSAT SA, ABSA Menlyn, Branch code 632 005
Account: 40 8982 6281


KLETSKOUS SPONSORS

 

RS, the component supplier in South Africa has become a component sponsor for the KLETSkous project.

RS Components is the market leader in the high service level distribution of electrical, electronic, mechanical & industrial products as well as tools.  Offering over 400 000 products across 2000 leading brands at www.rsonline.co.za, RS serves every sector of industry in the procurement of their products relating to maintenance, repair, operations, low volume production, research and development.


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