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Tuesday, January 11, 2011

HF Propagation and Monitoring

There have been further recurrences of the exciting Asia and Africa
daytime HF modes, but not at the same level or intensity as observed on Jan

This is the composite pattern as discovered on January 8, 2010, at the Eagle
Picnic Ground, Olinda Forest, 40 km east of central Melbourne, and on
January 10 at the Pound Bend Reserve, Warrandyte State Park, 20 km from
central Melbhourne.

I have also included some observations of broadcasts originating from
outside the
Asian and African areas.

9540 SAO TOME VOA African langs 0355
9560 CHINA Xizang PBS, Urumqi, Ughyur 0345
9635 VIETNAM VOV nat net 0420
9750 MALAYSIA VOV Kajang Malay 0420
9780 YEMEN Sanaa Arabic 0435
9805 FRANCE RFI -Issoudin French 0435
9820 IRAN VOIRI *0430
9835 MALAYSIA Sarawak-FM relay, Kajang, 0415
9850 VIETNAM VOV nat net 0400
9865 IRAN VOIRI Turkie 0430
9895 IRAN VOIRI Arabic 0435

11711 ARGENTINA RAE Spanish 0345 - still offset by 1 kHz from nominal
11710 - external service has been reprieved and is operating as usual!
11720 VIETNAM VOV nat net 0415
11815 BRAZIL R. Brasil Central, on late, 0420


The daytime Asia and African modes were discovored from Melbourne in 1959 -
they were observed over many years since, in Victoria, NSW, SA and WA,
appearing at around noon local time.

They are not the sort of thing that can be "dialled up", as they fade-in
and fade-out randomly and cannot be predicted. It's a matter of being there
when they are happening!

In the peak years of the 1960s and 1970s, many Asian and African signals
were audible in summwer at local noon in Eastern Australia (*0200 UTC) on 4
MHz, 5 MHz, and 6 MHz.

Those were the days!

Regards from Melbourne!

Bob Padula

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