Despite the absence of sunspots (who needs them anyway!), there is continuing excellent propagation into Melbourne during our after noon window, on 17 and 21 MHz.
This is dominated by transmitters located in Asia, the Middle East, and Africa, with signals following the shortpath (daylight) route from the west.
Channel occupancy on 17 MHz is extremely high.
Here is a summary made on May 9, between 0500 and 0530, from a field site in the Dandenong Ranges National Park, 30 km east of the Melbourne CBD, using the Eton E5 receiver and 5 m of antenna.
The location was at the junction of Management Road 13 and Olinda Creek Rd, near the Olinda Creek.
17485 CHINA CRI-Kashi, Arabic
17505 CHINA CRI-Kashi, English
17540 CHINA CRI-Kashi, English
17550 CHINA CNR, Beijing
17560 THAILAND IBB-Udorn, Russian
17565 CHINA CNR-Beijing
17595 CHINA CNR-SGZ
17605 CHINA CNR-Beijing
17615 MARIANAS RFA-Tinian, Mandarin
17625 CHINA CNR-Beijing
17640 CYPRUS BBC, English
17655 IRAN VOIRI, Russian to 0530*
17670 KUWAIT IBB, Pashto
17685 THAILAND IBB-Udorn, Pashto
17715 INDIA, various langs to 0530*
17720 CHINA CRI-Kashi, German
17730 CHINA CRI-Xian, English
17735 THAILAND IBB-Udorn, Tibetan
17740 CHINA CRI-Xian, Vietnamese
17770 THAILAND IBB-Udorn, Georgian
17790 THAILAND BBC-Nakhon, English
17810 JAPAN NHK-Yamata, English
17820 AUSTRALIA CVC-Darwin, Indonesian
17830 AUSTRALIA CVC-Darwin, Mandarin
17835 PAKISTAN R. Pakistan, Urdu
17845 INDIA, Arabic
17855 CHINA CRI-Beijing, English
17880 MARIANAS IBB-Saipan, Mandarin
17890 CHINA CNR-Beijing
17895 S. ARABIA BSKSA, Arabic
21550 MARIANAS RFA-Tinian, Mandarin
21690 MARIANAS RFA-Tinian, Mandarin
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Showing posts with label daytime propagation. Show all posts
Showing posts with label daytime propagation. Show all posts
Monday, May 11, 2009
Wednesday, February 4, 2009
Spectacular Asian midday propagation events!
On Tuesday February 3, 2009, rather remarkable propagation events were observed here in Melbourne, between 0130 and 0230, and 0330 and 0400.
This is during local mid-summer noon and early afternoon periods.
This was represented by extremely strong all-daylight-path signals from Asia, on frequencies as low as 5925, extending up to 10 MHz.
Of particular note were the unprecedented appearances of signals from stations in Laos (6130), Myanmar (7185), India (7125, 7290), Vietnam (5925, 6020), China (6115, 6185, 7170), and Malaysia (Sarawak)(6050).
Some of these signals have never been noted precviously during this time period in Melbourne!
These specialized propagation modes makes their appearances during the Australian summer, with signals appearing and vanishing almost randomly - some are present for a minute or so, others for periods up to an hour or more.
This propagation mode is not confined to Melbourne, and was also observed in central NSW, by my colleague Craig Seager in Bathurst, on Sunday February 1 in the same time period.
There is a reference to the Mode in the Australian Government's Department of Space Services Training Handbook (Ionospheric Prediction Service), as a "Specialized Complex Mode".
The actual propagation mechanism is not clearly understood, and is believed to be supported by reflection off the top layers of Sporadic E clouds, with no intermediate ground reflection, for part of the transmission path. This results in minimal absorption, generating very strong signals, often with no fading, and overriding locally generated power-line interference and noise.
Path lengths are enormous, of over 10,000 km, all-daylight!
The signal patterns resemble those of long-haul VHF reception, mobile telephone reception, or digital broadcasting.
Here is a summary of the events as noted on February 3 - there were two separate events, 0130 to 0230 and 0330 to 0400 - further research continues!
EVENT 1 - window 0130-0230
5925 VIETNAM VOV regional
5975 VIETNAM VOV regional
6020 VIETNAM VOV regional
6050 MALAYSIA RTM Sibu regional
6115 CHINA V. of Strait
6130 LAOS Vientienne, national network
6185 CHINA Chengdu regional network
7125 INDIA Delhi, Sindhi
7170 CHINA Lhasa, Mandarin
7185 MYANMAR Yangon, national network
7197 *CHINA PBS Xinjiang, Urumqui, Uighur (*Note: frequency is actually on
7197, not nominal 7195!)
7210 VIETNAM VOV national network
7225 CHINA PBS Xinjiang, Urumqi, Uighur, parallel 7197, new channel
7230 CHINA CNR1
7250 CHINA CNR8 Urumqi
7270 MALAYSIA RTM regional
7280 CHINA V. of Strait
7285 SRI LANKA DW-Trincomalee German
7295 MALAYSIA RTM Kajang English relaying FM domestic service
EVENT 2 - window 0330-0400:
7160 INDIA Chennai regional
7275 CHINA PBS Xinjiang, Urumqi, Uighur
7290 INDIA regional, huge signal!
9440 THAILAND BBC Nakon, Bengali
9450 CHINA CRI Kashi Mandarin
9570 CHINA CNR1
9630 CHINA CNR1
This is during local mid-summer noon and early afternoon periods.
This was represented by extremely strong all-daylight-path signals from Asia, on frequencies as low as 5925, extending up to 10 MHz.
Of particular note were the unprecedented appearances of signals from stations in Laos (6130), Myanmar (7185), India (7125, 7290), Vietnam (5925, 6020), China (6115, 6185, 7170), and Malaysia (Sarawak)(6050).
Some of these signals have never been noted precviously during this time period in Melbourne!
These specialized propagation modes makes their appearances during the Australian summer, with signals appearing and vanishing almost randomly - some are present for a minute or so, others for periods up to an hour or more.
This propagation mode is not confined to Melbourne, and was also observed in central NSW, by my colleague Craig Seager in Bathurst, on Sunday February 1 in the same time period.
There is a reference to the Mode in the Australian Government's Department of Space Services Training Handbook (Ionospheric Prediction Service), as a "Specialized Complex Mode".
The actual propagation mechanism is not clearly understood, and is believed to be supported by reflection off the top layers of Sporadic E clouds, with no intermediate ground reflection, for part of the transmission path. This results in minimal absorption, generating very strong signals, often with no fading, and overriding locally generated power-line interference and noise.
Path lengths are enormous, of over 10,000 km, all-daylight!
The signal patterns resemble those of long-haul VHF reception, mobile telephone reception, or digital broadcasting.
Here is a summary of the events as noted on February 3 - there were two separate events, 0130 to 0230 and 0330 to 0400 - further research continues!
EVENT 1 - window 0130-0230
5925 VIETNAM VOV regional
5975 VIETNAM VOV regional
6020 VIETNAM VOV regional
6050 MALAYSIA RTM Sibu regional
6115 CHINA V. of Strait
6130 LAOS Vientienne, national network
6185 CHINA Chengdu regional network
7125 INDIA Delhi, Sindhi
7170 CHINA Lhasa, Mandarin
7185 MYANMAR Yangon, national network
7197 *CHINA PBS Xinjiang, Urumqui, Uighur (*Note: frequency is actually on
7197, not nominal 7195!)
7210 VIETNAM VOV national network
7225 CHINA PBS Xinjiang, Urumqi, Uighur, parallel 7197, new channel
7230 CHINA CNR1
7250 CHINA CNR8 Urumqi
7270 MALAYSIA RTM regional
7280 CHINA V. of Strait
7285 SRI LANKA DW-Trincomalee German
7295 MALAYSIA RTM Kajang English relaying FM domestic service
EVENT 2 - window 0330-0400:
7160 INDIA Chennai regional
7275 CHINA PBS Xinjiang, Urumqi, Uighur
7290 INDIA regional, huge signal!
9440 THAILAND BBC Nakon, Bengali
9450 CHINA CRI Kashi Mandarin
9570 CHINA CNR1
9630 CHINA CNR1
Wednesday, January 21, 2009
Daytime Propagation Research, 7MHz and 9 MHz
Today in 37 degree heat I went out to the Olinda Forest, Dandenong Ranges National Park, 40 mins drive from here. This was primarily a bushwalking trip along the Olinda Creek Track.
Very good signals at one of my favourite field sites, at the junction of Olinda Creek Rd and gated Road 13. I leave an antenna in a gum tree there - saves reinstalling it each visit!
These are the important key Asian/African/ME signals which were present during the 0300 to 0400 window:
7210 VIETNAM VOV nat net
7295 MALAYSIA RTVM English
9500 CHINA CNR1
9505 CHINA V. of Strait
9520 SRI LANKA R. Farda,Iranawela, Farsi
9530 VIETNAM VOV nat net
9595 JAPAN R. Nikkei
9685 CHINA CNR5
9720 CHINA CNR2
9730 MYANMAR Nat Net
9745 S. AFRICA Channel Af, Meyerton, French *0400
9760 JAPAN R. Nikkei
9835 INDIA
9850 VIETNAM VOV Dialects network 0300-0310* new schedule, reopens 0400
9865 IRAN VOIRI
9870 INDIA huge level 0400
9875 VIETNAM VOV Dialects network 0300-0310* new schedule; reopens 0400
9910 INDIA
Very good signals at one of my favourite field sites, at the junction of Olinda Creek Rd and gated Road 13. I leave an antenna in a gum tree there - saves reinstalling it each visit!
These are the important key Asian/African/ME signals which were present during the 0300 to 0400 window:
7210 VIETNAM VOV nat net
7295 MALAYSIA RTVM English
9500 CHINA CNR1
9505 CHINA V. of Strait
9520 SRI LANKA R. Farda,Iranawela, Farsi
9530 VIETNAM VOV nat net
9595 JAPAN R. Nikkei
9685 CHINA CNR5
9720 CHINA CNR2
9730 MYANMAR Nat Net
9745 S. AFRICA Channel Af, Meyerton, French *0400
9760 JAPAN R. Nikkei
9835 INDIA
9850 VIETNAM VOV Dialects network 0300-0310* new schedule, reopens 0400
9865 IRAN VOIRI
9870 INDIA huge level 0400
9875 VIETNAM VOV Dialects network 0300-0310* new schedule; reopens 0400
9910 INDIA
Monday, December 22, 2008
Excellent daytime propagation from Asia, 7 and 9 MHz
On Sunday Dec 21 I was in the mountains overlooking the Maroondah Reservoir, 65 km east of Melbourne.
I had the Eton E5 receiver with me, and I was pleasantly surprised at the strong daytime signals from Asia in mid-afternoon via the Daytime Asian Mode.
As usual for this Mode, signals appeared out of nowhere, peaking to excellent in a few milliseconds! No fading. Influenced by topside reflection from Sporadic E clouds moving over northern Australia.
These are some of the signals, noted between 0400 and 0430:
7130 MALAYSIA Sarawak
7210 VIETNAM national network
7270 MALAYSIA Sarawak
7290 INDIA regional
7295 MALAYSIA domestic relay
9530 VIETNAM national network
9595 JAPAN R. Nikkei
9620 CHINA CNR2
9645 CHINA CNR1
9665 N. KOREA KCBS
9685 CHINA CNR5
9720 CHINA CNR1
9730 MYANMAR
9750 MALAYSIA V. of Islam
9760 JAPAN R. Nikkei
9810 CHINA CNR2
9850 VIETNAM dialects
9875 VIETNAM dialects
The picture, above, was taken at the monitoring site on the Maroondah Track.
I had the Eton E5 receiver with me, and I was pleasantly surprised at the strong daytime signals from Asia in mid-afternoon via the Daytime Asian Mode.
As usual for this Mode, signals appeared out of nowhere, peaking to excellent in a few milliseconds! No fading. Influenced by topside reflection from Sporadic E clouds moving over northern Australia.
These are some of the signals, noted between 0400 and 0430:
7130 MALAYSIA Sarawak
7210 VIETNAM national network
7270 MALAYSIA Sarawak
7290 INDIA regional
7295 MALAYSIA domestic relay
9530 VIETNAM national network
9595 JAPAN R. Nikkei
9620 CHINA CNR2
9645 CHINA CNR1
9665 N. KOREA KCBS
9685 CHINA CNR5
9720 CHINA CNR1
9730 MYANMAR
9750 MALAYSIA V. of Islam
9760 JAPAN R. Nikkei
9810 CHINA CNR2
9850 VIETNAM dialects
9875 VIETNAM dialects
The picture, above, was taken at the monitoring site on the Maroondah Track.
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