SOUTH AFRICAN RADIO LEAGUE

Propagation Research

Another Amateur Radio activity by the South African Radio League

 

Updated
20 December 2013

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 Breaking News:

ICASA AWARDS LONG TERM  5 MHz LICENSE TO SARL -ICASA has issued a long term license to  the SARL in support of the 5MHz propagation research project. The license expires  on 31 October 2015. Watch this space for more details.

5MHZ activity weekend  17 and 18 May. Details soon

WSPR tutorial available here soon

 

January Edition of 5 MHZ Newsletter by Paul Gaskell, G4MWO

Download here

 

STUDIES OF IONOGRAMS SHOW SUPREMACY OF THE 5 MHZ BAND

The ionograms generated by the South African ionosonde network clearly illustrate the supremacy of the 5 MHz band for short range, near vertical incidence  skywave (NVIS) communications under certain conditions. These typically happens during the morning and late afternoon when the 7 MHz band does not support short range, sky wave communications and the 3.5 and 1.8 MHz bands suffer from high noise levels. 

During the middle of the day the 7 MHz (and 10 MHz during high solar activity) band is typically the most effective medium for short range, sky wave communications.

Permanent access to the 5 MHz band will ensure that the amateur radio community can efficiently contribute to emergencies requiring short distance communications beyond line-of-sight as typically required in hilly and mountainous terrain.

The South African ionosonde network is unique in Africa and place South African radio amateurs in the very fortunate position to monitor reigning, short range propagation conditions and to improve their skills and experience accordingly.

An article by Hannes Coetzee illustrated with ionograms is available for download  here


SARL Members  will have access to 5 250 and 5 260 kHz as well as 472 kHz on registration requiring the completion of a registration form which can be downloaded here.

Once completed please email it to propresearch@sarl.org.za. Processing  time is a max three days.

All registered users will be listed  here

The SARL has been granted by the Independent Communications Agency  of South Africa (ICASA) access to two frequencies in the 5MHz band as well as 472 kHz . These pilot licenses are valid till 31 December 2013. It should be noted that use of these frequencies is limited only to Members of the South African Radio League

Maximum Bandwidth 3 kHz  Maximum power 100 Watt

Preferred mode USB/CW

SARL members may however also communicate with amateurs in other countries  outside South Africa with amateurs licensed to use 5MHz

5250 MHz  has been set aside  for various propagation research projects. Visit the this page for regular updates.

5260 MHz USB for general QSO's by SARL Members

Activity Reports and SWL Reports

SARL members making contact on 5260 kHz must keep logs and are requested to submit a copy of their logs to propresearch@sarl.org.za on a regular basis.

 Logs  may be in any format.

More information on 5MHz

 5MHz  International newsletter download here

World-wide 5MHz frequency listing download here

Download a chart of all 5 MHz allocations in the world here