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On the program today:
- The influence of solar activity on radio transmission
- Radio transmission forecast
- Radio calendar
- Broadcast tips
- DX Mix by Ivo Ivanov
Over the recent weeks solar activity has intensified. And solar activity is one of the main factors impacting on the propagation of radio waves. During weaker activity, following outbursts and when there is dense solar wind and other processes, radio transmission on the Earth deteriorates. This results from disruptions in the planet's magnetic field. One of the culprits for this phenomenon could be solar spots. The solar spot is found in an area where temperature reaches some 4000С and being darker, contrasts against the background of the crown. Though spots are many, only in some of them there is accumulation of a huge amount of energy altering their magnetic field. Probably the recovery of an altered magnetic field causes an outburst called a flare, resulting in the release of a huge quantity of plasma. This can also take place from areas where no spots can be seen but where a disruption in the magnetic balance of the solar crown is displayed. In both types of outbursts it is key whether released plasma targets the Earth. The plasma that consists of various particles crosses the distance from the Sun to the Earth for about 30 to 60 hours and reaching the Earth's atmosphere causes changes in the magnetic field. Very often this triggers magnetic storms that impact most negatively on every living creature in nature, including radio waves propagation. The latter manifests itself as radio stations disappear from the scale for a few hours. In intermediate latitudes this is most often seen between 9 am and 2 pm local time for the frequencies from 3 to 13 MHz with a most clear manifestation from 25 to 60 m on shortwave. The phenomenon is known as radio blackout or as the Moegel-Dillinger Effect. In Sofia it could be observed on dozens of occasions at the beginning of 21 c., for example on 31 March 2001 and on 31 March 2002 when in the ranges of 31, 41 and 49 m shortwave between 9 am and 2 pm local time not a single radio station could be received. Unfortunately the solar outbursts cannot be predicted too early despite the system of state-of-the-art satellites and telescopes observing the luminary around-the-clock. In the best of cases this can be predicted 24 hours in advance. Radio listeners can follow specialized bulletins about solar activity and in this way can predict disturbances in radio propagation. Knowledge of these events will help listeners in clarifying the reasons behind deteriorated radio propagation at low frequencies and on shortwave.
* * *
The conditions for radio reception on shortwave for the next seven days will be determined by solar spots No. 1161 and 1162 withdrawing from the Sun's limb. They are dangerous for us for the possible M-class solar flares. Most probably good conditions for reception during day time will continue for the ranges from 13 to 19 m on shortwave.
* * *
Now the calendar for end-February: On 24 Feb. 1942 Radio Voice of America was launched. On 25 Feb. Radio Thailand turned 80, and on 28 Feb. 1948 the first DX program worldwide was aired by Radio Sweden. On the same date in 1949 the first ultra shortwave (FM) transmitter in Europe started operation from in Munich, Germany.
* * *
BROADCAST TIPS:
KOREA: Radio Voice Of The People broadcasts from the Republic of Korea to the Democratic People's Republic of Korea. It was heard on 16 Feb. at 18:30 on 3480, 4450, 3912, 6518 and 6600 kHz.
PAKISTAN: On 16 Feb. Radio Pakistan broadcast news in Urdu from 09:00 and news in English from 09:05 with the identification "This is Radio Pakistan External Service" on 15100 and 17700 kHz.
KYRGYZSTAN: The Kyrgyz National Radio was received on 4010 and 4795 kHz at 01:15 with news in Kyrgyz and some Russian. The program of Radio Rossii is received regularly after 00.00 and after 15.00 hrs on 4050 kHz from a transmitter in Bishkek.
ANGOLA: Rarely listened Рядко Radio Nacional was heard on 17 Feb. with songs and identification identification in Portuguese and in vernacular at 20:30 hrs on 4950 kHz.
SOUTH AFRICA: The weekly program of the South African Short Wave League in English was heard at the start of the emission at 20:03 hrs on 3215 kHz AM and 7082 kHz USB. The program is aired on Monday and is a repeat of the Sunday program from 08:00 hrs on 17860, 7205 and 7082 kHz.
ZIMBABWE: Radio Zimbabwe was again heard with news from 20:00 hrs on 4828 kHz but is not received with its other program on 3396 kHz.
Written by Rumen Pankov
Translated by Daniela Konstantinova
DX MIX
All times in Universal Time Coordinated (UTC), all frequencies in kHz
UK: in this edition we bring you the third part of the winter schedule of stations using a BABCOCK transmitter:
IBRA Radio
1100-1200 hrs on 9945 kHz Palau 100 kW / 318 degrees for East Asia in Mandarin
1730-1800 hrs on 11740 kHz Meyerton 100 kW/15 degrees for East Africa in Somali
1730-1800 hrs on 11785 kHz Skelton 300 kW / 140 degrees for Central Africa on Swahili
1800-1900 hrs on 9420 kHz Rampisham 250 kW / 95 degrees for the Middle East in Arabic
1800-1900 hrs on 12045 kHz Wooferton 250 kW / 114 degrees for the Middle East in Arabic
1800-2015 hrs on 9635 kHz Skelton 300 kW / 140 degrees for East Africa in Arabic
1900-2030 hrs on 7445 kHz Rampisham 500 kW / 160 degrees for West Africa on Fulfulde
Eternal Good News in English
1130-1145 hrs Fridays on 15525 kHz Al-Dhabbaya 250 kW / 100 degrees for South Asia
Deutsche Welle in German for South Asia under DRM regime 1100-1400 and 1600-1800 hrs on 5845 kHz Nakhon 100 kW / 290 degrees
1600-1700 hrs on 13590 kHz Trincomalee 090 kW / 5 degrees and 0200-0300 hrs on 15205 kHz Trincomalee 090 kW / 45 degrees for Southeast Asia
Trans World Radio Africa for East Africa
1300-1315 hrs Friday through Sunday on 13660 kHz Kigali 250 kW / 30 degrees in Afar
1730-1800 hrs Fridays on 9775 kHz Al-Dhabbaya 250 kW / 230 degrees in Amharic
1800-1845 hrs on 5965 kHz Al-Dhabbaya 250 kW / 225 degrees under the following schedule:
1800-1815 hrs Monday through Wednesday in Tigrina and on Thursdays and Fridays in Amharic
1800-1830 hrs on Saturdays in Tigre and on Sundays in Kunama
1815-1845 hrs Monday through Friday in and
1830-1845 hrs on Sundays in Amharic
The Voice of Tibet in Tibetan
1330-1400 hrs on 13755 kHz Al-Dhabbaya 250 kW / 70 degrees for Central Asia
Gospel for Asia for Southeast Asia in vernaculars via Al-Dhabbaya 250 kW
1600-1615 hrs on 9820 kHz / 100 degrees
1615-1630 hrs Sunday through Wednesday on 9820 kHz / 70 degrees
1615-1630 hrs Thursday through Saturday on 9820 kHz / 120 degrees
2330-2400 hrs on 6160 kHz and 0000-0130 on 6140 kHz Al-Dhabbaya 250 kW / 85 degrees
Southern Sudan Radio Service for East Africa Saturday through Thursday
1600-1700 hrs on 11785 kHz Meyerton 100 kW / undirected antenna and on 17700 kHz Ascension 250 kW / 65 degrees in Arabic and 1600-1630 hrs in Fur, Masaalit and Zagawa 1630-1700 hrs.
Written by Ivo Ivanov, Frequency Manager of Radio Bulgaria
Translated by Daniela Konstantinova
- The influence of solar activity on radio transmission
- Radio transmission forecast
- Radio calendar
- Broadcast tips
- DX Mix by Ivo Ivanov
Over the recent weeks solar activity has intensified. And solar activity is one of the main factors impacting on the propagation of radio waves. During weaker activity, following outbursts and when there is dense solar wind and other processes, radio transmission on the Earth deteriorates. This results from disruptions in the planet's magnetic field. One of the culprits for this phenomenon could be solar spots. The solar spot is found in an area where temperature reaches some 4000С and being darker, contrasts against the background of the crown. Though spots are many, only in some of them there is accumulation of a huge amount of energy altering their magnetic field. Probably the recovery of an altered magnetic field causes an outburst called a flare, resulting in the release of a huge quantity of plasma. This can also take place from areas where no spots can be seen but where a disruption in the magnetic balance of the solar crown is displayed. In both types of outbursts it is key whether released plasma targets the Earth. The plasma that consists of various particles crosses the distance from the Sun to the Earth for about 30 to 60 hours and reaching the Earth's atmosphere causes changes in the magnetic field. Very often this triggers magnetic storms that impact most negatively on every living creature in nature, including radio waves propagation. The latter manifests itself as radio stations disappear from the scale for a few hours. In intermediate latitudes this is most often seen between 9 am and 2 pm local time for the frequencies from 3 to 13 MHz with a most clear manifestation from 25 to 60 m on shortwave. The phenomenon is known as radio blackout or as the Moegel-Dillinger Effect. In Sofia it could be observed on dozens of occasions at the beginning of 21 c., for example on 31 March 2001 and on 31 March 2002 when in the ranges of 31, 41 and 49 m shortwave between 9 am and 2 pm local time not a single radio station could be received. Unfortunately the solar outbursts cannot be predicted too early despite the system of state-of-the-art satellites and telescopes observing the luminary around-the-clock. In the best of cases this can be predicted 24 hours in advance. Radio listeners can follow specialized bulletins about solar activity and in this way can predict disturbances in radio propagation. Knowledge of these events will help listeners in clarifying the reasons behind deteriorated radio propagation at low frequencies and on shortwave.
* * *
The conditions for radio reception on shortwave for the next seven days will be determined by solar spots No. 1161 and 1162 withdrawing from the Sun's limb. They are dangerous for us for the possible M-class solar flares. Most probably good conditions for reception during day time will continue for the ranges from 13 to 19 m on shortwave.
* * *
Now the calendar for end-February: On 24 Feb. 1942 Radio Voice of America was launched. On 25 Feb. Radio Thailand turned 80, and on 28 Feb. 1948 the first DX program worldwide was aired by Radio Sweden. On the same date in 1949 the first ultra shortwave (FM) transmitter in Europe started operation from in Munich, Germany.
* * *
BROADCAST TIPS:
KOREA: Radio Voice Of The People broadcasts from the Republic of Korea to the Democratic People's Republic of Korea. It was heard on 16 Feb. at 18:30 on 3480, 4450, 3912, 6518 and 6600 kHz.
PAKISTAN: On 16 Feb. Radio Pakistan broadcast news in Urdu from 09:00 and news in English from 09:05 with the identification "This is Radio Pakistan External Service" on 15100 and 17700 kHz.
KYRGYZSTAN: The Kyrgyz National Radio was received on 4010 and 4795 kHz at 01:15 with news in Kyrgyz and some Russian. The program of Radio Rossii is received regularly after 00.00 and after 15.00 hrs on 4050 kHz from a transmitter in Bishkek.
ANGOLA: Rarely listened Рядко Radio Nacional was heard on 17 Feb. with songs and identification identification in Portuguese and in vernacular at 20:30 hrs on 4950 kHz.
SOUTH AFRICA: The weekly program of the South African Short Wave League in English was heard at the start of the emission at 20:03 hrs on 3215 kHz AM and 7082 kHz USB. The program is aired on Monday and is a repeat of the Sunday program from 08:00 hrs on 17860, 7205 and 7082 kHz.
ZIMBABWE: Radio Zimbabwe was again heard with news from 20:00 hrs on 4828 kHz but is not received with its other program on 3396 kHz.
Written by Rumen Pankov
Translated by Daniela Konstantinova
DX MIX
All times in Universal Time Coordinated (UTC), all frequencies in kHz
UK: in this edition we bring you the third part of the winter schedule of stations using a BABCOCK transmitter:
IBRA Radio
1100-1200 hrs on 9945 kHz Palau 100 kW / 318 degrees for East Asia in Mandarin
1730-1800 hrs on 11740 kHz Meyerton 100 kW/15 degrees for East Africa in Somali
1730-1800 hrs on 11785 kHz Skelton 300 kW / 140 degrees for Central Africa on Swahili
1800-1900 hrs on 9420 kHz Rampisham 250 kW / 95 degrees for the Middle East in Arabic
1800-1900 hrs on 12045 kHz Wooferton 250 kW / 114 degrees for the Middle East in Arabic
1800-2015 hrs on 9635 kHz Skelton 300 kW / 140 degrees for East Africa in Arabic
1900-2030 hrs on 7445 kHz Rampisham 500 kW / 160 degrees for West Africa on Fulfulde
Eternal Good News in English
1130-1145 hrs Fridays on 15525 kHz Al-Dhabbaya 250 kW / 100 degrees for South Asia
Deutsche Welle in German for South Asia under DRM regime 1100-1400 and 1600-1800 hrs on 5845 kHz Nakhon 100 kW / 290 degrees
1600-1700 hrs on 13590 kHz Trincomalee 090 kW / 5 degrees and 0200-0300 hrs on 15205 kHz Trincomalee 090 kW / 45 degrees for Southeast Asia
Trans World Radio Africa for East Africa
1300-1315 hrs Friday through Sunday on 13660 kHz Kigali 250 kW / 30 degrees in Afar
1730-1800 hrs Fridays on 9775 kHz Al-Dhabbaya 250 kW / 230 degrees in Amharic
1800-1845 hrs on 5965 kHz Al-Dhabbaya 250 kW / 225 degrees under the following schedule:
1800-1815 hrs Monday through Wednesday in Tigrina and on Thursdays and Fridays in Amharic
1800-1830 hrs on Saturdays in Tigre and on Sundays in Kunama
1815-1845 hrs Monday through Friday in and
1830-1845 hrs on Sundays in Amharic
The Voice of Tibet in Tibetan
1330-1400 hrs on 13755 kHz Al-Dhabbaya 250 kW / 70 degrees for Central Asia
Gospel for Asia for Southeast Asia in vernaculars via Al-Dhabbaya 250 kW
1600-1615 hrs on 9820 kHz / 100 degrees
1615-1630 hrs Sunday through Wednesday on 9820 kHz / 70 degrees
1615-1630 hrs Thursday through Saturday on 9820 kHz / 120 degrees
2330-2400 hrs on 6160 kHz and 0000-0130 on 6140 kHz Al-Dhabbaya 250 kW / 85 degrees
Southern Sudan Radio Service for East Africa Saturday through Thursday
1600-1700 hrs on 11785 kHz Meyerton 100 kW / undirected antenna and on 17700 kHz Ascension 250 kW / 65 degrees in Arabic and 1600-1630 hrs in Fur, Masaalit and Zagawa 1630-1700 hrs.
Written by Ivo Ivanov, Frequency Manager of Radio Bulgaria
Translated by Daniela Konstantinova
Yimber Gaviria, Colombia
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