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Tuesday, October 1, 2013

Propagation Research

I was in the South Hill old gold-mining area of the Warrandyte State Park on Sep 30, 2013.
Sadly, no gold, but I did discover some interesting propagation during the mid-afternoon window, using the small Eton radio and a 2 m antenna.
VOIRI has retimed many (all?) of its transmissions, which re now heard opening and closing ten minutes earlier, such as *0450 (instead of *0500) etc..
VOA and RFA continue to operate to a complex schedule for their 21 MHz Chinese and Tibetan services for local daytime reception across Asia. At any given time, some services use different frequencies  on a rotating basis – different freqs for each day!.
Here are the results, looking at 11 MHz, 13 MHz, and 21 MHz, in the 0430 to 0530 window:
11820 – 11840
This spectrum block is now noted with in-band DRM transmissions in French from R. Romania International from 0500-0530*. This is a massive 300 KW, azimuth 285 degrees, effectively destroying use of this spectrum area by other broadcasters. The "centre" frequency is 11830. If it is really necessary to use  DRM, these transmissions should be placed well away from in-band channels!
13610 CHINA CNR1
13630 UZBEKISTAN CVC-Tashkent Urdu
13650 N. KOREA VOK French 0440
13670 CHINA PBS Xinjiang Uyghur 0430
13685 FRANCE RFI-Issoudin French 0445
13695 FRANCE RFI-Issoudin French 0500
13700 CHINA CNR13
13710 IRAN Turkish 0430
13720 UAE Sudan R. Service, Dhabbaya, Arabic 0430
13740 IRAN Dari 0430
13750 IRAN *0450 Russian
13760 N. KOREA VOK English
13765 MADAGASCAR VR-Talata French 0440
13775 TAIWAN SOH 0445. disturbed by serious wideband jamming extending from 13770 to 13795
13790 MARIANAS RFA Chinese
13820 TAIWAN Sound of Hope 0500
13850 EGYPT Arabic 0515, terrible modulation!
13860 GERMANY R. Farda, Lampertheim
21455 MARIANAS RFA-Tinian Chinese 0430
21460 PHILS VOA-Tinang *0500 Tibetan
21465 PHILS VOA-Tinang *0500 Tibetan
21520 IRAN *0450 Russian
21650 MARIANAS RFA-Tinian *0500 Chinese

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