BC-DX TopNews WWDXC #945 BC-DX 945

BC-DX TopNews WWDXC #945 BC-DX 945 BC-DX TopNews WWDXC #945 BC-DX 945

10.12.2012 Views

measurements of summer mesopause echoes at SURA. Page(s) 935-941. SURA radar for atmospheric studies. Observations of mesospheric echoes were carried out at the SURA facility of Radiophysical Research Institute (NIRFI, Nizhny Novgorod, Russia). It is situated a few kilometers from the small town of Vasil'sursk about 140 km eastward of N. Novgorod (geographical coordinates 56.13 N, 46.10 E). The Mesospheric radar was created at SURA using the heating facility antenna array designed for artificial modification of the ionosphere by powerful HF radiation. This antenna array consists of 12 x 12 crossed dipoles divided into three identical sub-arrays in the magnetic north+south direc-tion (about 9degr to the east from the geographical north) and can be operated in the frequency range of 4.5+ 9 MHz with both left and right circular polarizations. It is steerable in the north+south direction up to 40degr from the vertical (Belov et al., 1983). The main parameters ofthe antenna array are shown in Table 1. Each antenna sub-array is fully independent, and one of the sub-arrays is used as a transmitting antenna, while another is used as a receiving antenna. This same radar was used for magnetospheric sounding (Gurevich et al., 1992) with one of the main heating transmitters. These broadcast transmitters were designed for continuous operation and were not very suitable for our mesosphere investigations, due mainly to high electricity costs and limited pulse characteristics. Therefore another transmitter was connected to one of the antenna sub-arrays for mesosphere sounding, namely a pulsed transmitter with about 50-kW peak power. The transmitter parameters are shown in Table 2. The radar receiver is a modified professional receiver with a wide filter bandwidth to operate with short pulses and with a quadrature detector that provides phase measurements. The facility at Vasil'sursk. The laboratory was founded in 1965 in Vasil'sursk located at latitude 56 07 N, longitude 46 00 E, about 140 km East from Nizhny Novgorod. The low frequency facility has an antenna array, comprising three sections. Figure 1 shows the system of 12 by 12 crossed dipole elements, which covers an area of 300 by 300 metres. Each of the three sections has an set of 4 by 12 elements; each section can be pointed independently. The beams may be steered manually or electrically, in steps of three degrees, to point at angles between 12 and 85 degrees. Each section has a 300-metre aperture, and its radiation pattern approximates to a sin(x)/x shape. Radiated signals are circularly polarised. Figure 1. The transmitting antenna system at Vasil'sursk. A separate 250 kW transmitter is connected to each of the three antenna sections. Transmitter frequencies are stable to one part in 10(exp 7). Amplitude or phase modulation (or both together) are available, and external synchronisation is possible. Emissions may be a continuous carrier or a pulsed emission whose shortest pulse is 50 milliseconds. The file:///Z|/DOKUMENTATION-BULLETINS/WWDXD-BCDX/2010/bcdx984.txt[11.06.2012 10:40:24]

operating frequency range is 4.6 - 9.3 MHz. Table 1 and Table 2 give the parameters of one antenna section whose beam points to a zenith angle of 34 degrees (the Sun position in July) and transmitting 250 kW. Table 1 Frequency Half-power beam Time for Sun width (calculated) within the beam --------- ------------------ --------------- 9.05 MHz 6.3 by 22.8 deg. 18.5 minutes 9.31 MHz 6.1 by 22.1 deg. 18.0 minutes Table 2 Frequency Measured-Gain Eff. area Eff. radiated (using Moon) power ---------- ------------ --------- ------------- 9.05 MHz 77 (+10%) 6700 sq m 19.2 MW (+1dB) 9.31 MHz 77 (+10%) 6400 sq m 19.2 MW (+1dB) (wb, wwdxc BC-DX TopNews Oct 14) SINGAPORE/THAILAND/U.K. Frequency changes of BBC: 0300-0400 NF 5790 SKN 300 kW 110 deg to N/ME, ex 11820 in Arabic 0400-0500 NF 5790 SKN 300 kW 140 deg to NoAf, ex 9915 in Arabic 0600-0700 NF 9410 SKN 300 kW 180 deg to NEAf, ex 15105 in English 1500-1600 NF 11745 SNG 250 kW 315 deg to SoAs, ex 11740 in Urdu Additional txion of BBC in Burmese from Oct. 4: 0200-0230 on 7380 NAK 250 kW 325 deg 9480 NAK 250 kW 355 deg 11995 SNG 250 kW 340 deg (R BULGARIA DX MIX News, Ivo Ivanov, via wwdxc BC-DX TopNews Oct 13) 11975 Croatian Radio in Croatian via Kranji-SNG to AUS, NZl, PAC at 08-12 UT. S=3 tiny poor in EUR, at 0840 UT Oct 16. // 7320 kHz Zagreb Deanovec, both signals nearly audio synchron. (wb, wwdxc BC-DX TopNews Oct 16) SLOVAK REP 9515 IRRS-Shortwave of Nexus-IBA Milan organization noted Oct 16 at 0828 UT, some religious? pop music? Older English announcer. S=9+30dB powerful signal. The Nexus-IBA website is terrible puzzling, no pop mx content visible at (wb, wwdxc BC-DX TopNews Oct 16) SOLOMON ISLS 5020 SIBC at 1158 UT in usual sign-off routine, man in English with devotional, woman with ID and announcements and anthem at 1202 UT. Poor. (Harold Sellers-BC-CAN, DXplorer Oct 14) SPAIN 1341 Onda Cero Radio Almeria QSL. Nach 18 Tagen kamen Brief, eine CD, diverse Aufkleber, sowie ein Prospekt ueber Almeria fuer einen RR ueber das von 0655-0700 Ortszeit ausgestrahlte Lokalprogramm. Empfang hier in Genf ist nicht ganz einfach, da auf 1341 meist die Frequenzgenossen Magyar Katolikus Radio, Onda Cero Radio Ciudad Real und SER Leon dominieren. Adresse: Onda Cero Radio file:///Z|/DOKUMENTATION-BULLETINS/WWDXD-BCDX/2010/bcdx984.txt[11.06.2012 10:40:24]

operating frequency range is 4.6 - 9.3 MHz. Table 1 and Table 2 give the<br />

parameters of one antenna section whose beam points to a zenith angle of<br />

34 degrees (the Sun position in July) and transmitting 250 kW.<br />

Table 1<br />

Frequency Half-power beam Time for Sun<br />

width (calculated) within the beam<br />

--------- ------------------ ---------------<br />

9.05 MHz 6.3 by 22.8 deg. 18.5 minutes<br />

9.31 MHz 6.1 by 22.1 deg. 18.0 minutes<br />

Table 2<br />

Frequency Measured-Gain Eff. area Eff. radiated<br />

(using Moon) power<br />

---------- ------------ --------- -------------<br />

9.05 MHz 77 (+10%) 6700 sq m 19.2 MW (+1dB)<br />

9.31 MHz 77 (+10%) 6400 sq m 19.2 MW (+1dB)<br />

(wb, wwdxc <strong>BC</strong>-<strong>DX</strong> <strong>TopNews</strong> Oct 14)<br />

SINGAPORE/THAILAND/U.K. Frequency changes of B<strong>BC</strong>:<br />

0300-0400 NF 5790 SKN 300 kW 110 deg to N/ME, ex 11820 in Arabic<br />

0400-0500 NF 5790 SKN 300 kW 140 deg to NoAf, ex 9915 in Arabic<br />

0600-0700 NF 9410 SKN 300 kW 180 deg to NEAf, ex 15105 in English<br />

1500-1600 NF 11745 SNG 250 kW 315 deg to SoAs, ex 11740 in Urdu<br />

Additional txion of B<strong>BC</strong> in Burmese from Oct. 4:<br />

0200-0230 on 7380 NAK 250 kW 325 deg<br />

9480 NAK 250 kW 355 deg<br />

11995 SNG 250 kW 340 deg<br />

(R BULGARIA <strong>DX</strong> MIX News, Ivo Ivanov, via wwdxc <strong>BC</strong>-<strong>DX</strong> <strong>TopNews</strong> Oct 13)<br />

11975 Croatian Radio in Croatian via Kranji-SNG to AUS, NZl, PAC at 08-12<br />

UT. S=3 tiny poor in EUR, at 0840 UT Oct 16. // 7320 kHz Zagreb Deanovec,<br />

both signals nearly audio synchron.<br />

(wb, wwdxc <strong>BC</strong>-<strong>DX</strong> <strong>TopNews</strong> Oct 16)<br />

SLOVAK REP 9515 IRRS-Shortwave of Nexus-IBA Milan organization noted<br />

Oct 16 at 0828 UT, some religious? pop music? Older English announcer.<br />

S=9+30dB powerful signal. The Nexus-IBA website is terrible puzzling, no<br />

pop mx content visible at<br />

<br />

(wb, wwdxc <strong>BC</strong>-<strong>DX</strong> <strong>TopNews</strong> Oct 16)<br />

SOLOMON ISLS 5020 SI<strong>BC</strong> at 1158 UT in usual sign-off routine, man in<br />

English with devotional, woman with ID and announcements and anthem at<br />

1202 UT. Poor.<br />

(Harold Sellers-<strong>BC</strong>-CAN, <strong>DX</strong>plorer Oct 14)<br />

SPAIN 1341 Onda Cero Radio Almeria QSL.<br />

Nach 18 Tagen kamen Brief, eine CD, diverse Aufkleber, sowie ein Prospekt<br />

ueber Almeria fuer einen RR ueber das von 0655-0700 Ortszeit ausgestrahlte<br />

Lokalprogramm. Empfang hier in Genf ist nicht ganz einfach, da auf 1341<br />

meist die Frequenzgenossen Magyar Katolikus Radio, Onda Cero Radio Ciudad<br />

Real und SER Leon dominieren.<br />

Adresse:<br />

Onda Cero Radio<br />

file:///Z|/DOKUMENTATION-BULLETINS/WW<strong>DX</strong>D-<strong>BC</strong><strong>DX</strong>/2010/bcdx984.txt[11.06.2012 10:40:24]

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