Perseids - 2021

Here are my results of meteor scatter observations on CCIR FM band made on 12.08.2021 - 15.08.2021 during Perseids meteor shower. Mostly powerful transmitters from Germany, Czech Republic, Poland and Denmark, as usual, plus one Italian station. Level of QRM has been increasing at my location from year to year, so all the stations were identified by playlists and podcasts only, no RDS information was decoded this time. The shortest distance is ~870 km (Ostrava/Hošťálkovice, CZE), the longest distance is ~1580 km (Holstebro/Mejrup, DNK), the lowest ERP is 10 kW (Radio PSR via Schöneck (Vogtland)), the highest ERP is 160 kW (NDR Kultur via Rostock-Toitenwinkel).

12.08.2021

20:46	91.10	MHz	CZE	ČRo Radiožurnál	České Budějovice/Kleť	78	kW	1170	km	268	°
20:46	92.10	MHz	D	Bayern 1	Brotjacklriegel	100	kW	1250	km	269	°
20:46	91.20	MHz	D	SWR 4 Baden-Württemberg	Waldburg	25	kW	1530	km	267	°
21:14	88.80	MHz	CZE	ČRo Sever	Ústí nad Labem/Buková hora	100	kW	1140	km	278	°
21:14	89.00	MHz	D	89.0 RTL	Brocken	60	kW	1390	km	284	°
21:14	89.90	MHz	D	NDR Kultur	Torfhaus (Harz-West)	100	kW	1400	km	284	°
21:14	90.10	MHz	D	MDR JUMP	Dresden-Wachwitz	100	kW	1170	km	280	°
21:14	90.20	MHz	D	MDR JUMP	Inselsberg	100	kW	1410	km	280	°
21:14	90.50	MHz	CZE	ČRo Hradec Králové	Trutnov/Černá hora	20	kW	1040	km	277	°
21:14	90.90	MHz	CZE	ČRo Radiožurnál	Ústí nad Labem/Buková hora	100	kW	1140	km	278	°
21:14	91.10	MHz	D	NDR 1 Niedersachsen	Steinkimmen	100	kW	1540	km	290	°
21:14	91.30	MHz	D	Deutschlandfunk (Dlf)	Rimberg (tent.)	50	kW	1480	km	280	°
21:14	91.40	MHz	D	Bayern 1	Büttelberg	25	kW	1440	km	274	°
21:14	91.50	MHz	D	MDR JUMP	Brocken	100	kW	1390	km	284	°
21:14	92.10	MHz	D	NDR 2	Torfhaus (Harz-West)	100	kW	1400	km	284	°
21:14	92.20	MHz	D	MDR Sachsen	Dresden-Wachwitz	100	kW	1170	km	280	°
21:14	87.60	MHz	D	hr3	Sackpfeife (Biedenkopf)	100	kW	1540	km	281	°
21:14	87.90	MHz	D	MDR Kultur (tent.)	Inselsberg	60	kW	1410	km	280	°

13.08.2021

17:01	91.10	MHz	CZE	ČRo Radiožurnál	České Budějovice/Kleť	78	kW	1170	km	268	°

14.08.2021

08:55	90.10	MHz	D	SWR 4 Baden-Württemberg	Stuttgart-Degerloch	100	kW	1540	km	272	°
08:55	90.20	MHz	D	MDR JUMP	Inselsberg	100	kW	1410	km	280	°
08:55	90.70	MHz	D	Bayern 1	Ochsenkopf (tent.)	100	kW	1320	km	276	°
08:55	90.90	MHz	CZE	ČRo Radiožurnál	Ústí nad Labem/Buková hora	100	kW	1140	km	278	°
08:55	91.00	MHz	CZE	Frekvence 1	Ostrava/Hošťálkovice	71	kW	870	km	271	°
08:55	91.00	MHz	D	NDR 1 Radio MV	Rostock-Toitenwinkel	100	kW	1310	km	296	°
08:55	91.10	MHz	CZE	ČRo Radiožurnál	České Budějovice/Kleť	78	kW	1170	km	268	°
08:55	91.40	MHz	D	Bayern 1	Büttelberg	25	kW	1440	km	274	°
08:55	91.70	MHz	D	MDR Thüringen	Sonneberg/Bleßberg	100	kW	1370	km	278	°
08:55	91.90	MHz	D	Bayern 1	Hühnerberg	25	kW	1430	km	271	°
08:55	92.10	MHz	D	Bayern 1	Brotjacklriegel	100	kW	1250	km	269	°
08:55	92.20	MHz	D	SWR 3	Stuttgart-Degerloch	100	kW	1540	km	272	°
09:42	91.40	MHz	I	RMC - Radio Monte Carlo	Castel San Pietro Terme (tent.)	130	kW	1570	km	252	°
09:50	88.20	MHz	D	NDR Kultur (tent.)	Rostock-Toitenwinkel	160	kW	1310	km	296	°
10:00	87.60	MHz	CZE	Radio Impuls (tent.)	Brno/Kojál	67	kW	980	km	269	°
10:00	91.40	MHz	CZE	Radio Impuls (tent.)	Plzeň/Krašov	100	kW	1230	km	275	°
10:00	91.00	MHz	CZE	Frekvence 1 (tent.)	Ostrava/Hošťálkovice	71	kW	870	km	271	°
10:00	91.10	MHz	CZE	ČRo Radiožurnál	České Budějovice/Kleť	78	kW	1170	km	268	°
10:19	88.80	MHz	CZE	ČRo Sever	Ústí nad Labem/Buková hora	100	kW	1140	km	278	°
10:19	89.10	MHz	CZE	ČRo Radiožurnál	Plzeň/Krašov	100	kW	1230	km	275	°
10:19	90.30	MHz	POL	PR 3 (tent.)	Opole/Chrzelice	60	kW	900	km	276	°
10:19	90.50	MHz	CZE	ČRo Hradec Králové	Trutnov/Černá hora	20	kW	1040	km	277	°
10:19	90.60	MHz	D	hr1	Hardberg	50	kW	1550	km	275	°
10:19	90.90	MHz	CZE	ČRo Radiožurnál	Ústí nad Labem/Buková hora	100	kW	1140	km	278	°
10:19	91.40	MHz	CZE	Radio Impuls (tent.)	Plzeň/Krašov	100	kW	1230	km	275	°
10:19	91.70	MHz	D	MDR Thüringen	Sonneberg/Bleßberg	100	kW	1370	km	278	°
10:19	92.10	MHz	CZE	Radio Impuls (tent.)	Trutnov/Černá hora	16	kW	1040	km	277	°
10:19	90.70	MHz	CZE	ČRo Radiožurnál	Jihlava/Javořice	20	kW	1090	km	269	°
10:19	91.10	MHz	CZE	ČRo Radiožurnál	České Budějovice/Kleť	78	kW	1170	km	268	°
10:23	88.20	MHz	D	NDR Kultur	Rostock-Toitenwinkel	160	kW	1310	km	296	°
10:23	90.50	MHz	D	NDR 1 Radio MV	Helpterberg	100	kW	1200	km	293	°
10:23	91.00	MHz	D	NDR 1 Radio MV	Rostock-Toitenwinkel	100	kW	1310	km	296	°
10:23	91.40	MHz	D	Berliner Rundfunk 91.4	Berlin/Alexanderplatz	100	kW	1200	km	288	°
10:23	92.00	MHz	POL	PR Radio Szczecin	Szczecin/Kołowo	60	kW	1130	km	293	°
10:33	91.00	MHz	D	NDR 1 Radio MV (tent.)	Rostock-Toitenwinkel	100	kW	1310	km	296	°
10:33	91.70	MHz	D	MDR Thüringen	Sonneberg/Bleßberg	100	kW	1370	km	278	°
10:33	92.00	MHz	POL	PR Radio Szczecin	Szczecin/Kołowo	60	kW	1130	km	293	°
10:33	88.20	MHz	D	NDR Kultur (tent.)	Rostock-Toitenwinkel	160	kW	1310	km	296	°
10:33	90.50	MHz	D	NDR 1 Radio MV (tent.)	Helpterberg	100	kW	1200	km	293	°
17:44	88.10	MHz	DNK	DR P2 (tent.)	Århus/Søsterhøj	60	kW	1480	km	303	°
17:44	90.20	MHz	DNK	DR P2 (tent.)	Holstebro/Mejrup	60	kW	1580	km	303	°
17:44	91.70	MHz	DNK	DR P3	Århus/Søsterhøj	60	kW	1480	km	303	°

15.08.2021

13:14	90.90	MHz	CZE	ČRo Radiožurnál	Ústí nad Labem/Buková hora	100	kW	1140	km	278	°
13:14	91.40	MHz	CZE	Radio Impuls (tent.)	Plzeň/Krašov	100	kW	1230	km	275	°
13:14	92.00	MHz	D	Radio PSR	Schöneck (Vogtland)	10	kW	1280	km	277	°
13:14	92.20	MHz	D	MDR Sachsen	Dresden-Wachwitz	100	kW	1170	km	280	°
13:16	88.20	MHz	D	NDR Kultur	Rostock-Toitenwinkel	160	kW	1310	km	296	°
13:16	89.30	MHz	POL	RMF FM	Koszalin/Gołogóra	60	kW	1020	km	299	°
13:16	92.20	MHz	DNK	DR P4 Sjælland	Nakskov	30	kW	1390	km	299	°

All the stations were identified by playlists, podcasts, or parallel frequencies. Power values are ERP, distances are approximate. No stations were identified by RDS this time.

RX: Airspy Mini SDR

ANT: 80 mb dipole

Meteor scatter observations 12.08.2020 - 16.08.2020

And again Perseids, one of the most abundant meteor showers. The middle of August is a suitable time for meteor observations not only in optical part of the electromagnetic spectrum, but also on radio waves, which can be reflected by plasma of meteor trails and received on distances of a single E-hop, far away from transmitters.

General impressions: the signals were weaker than past year, thats why no stations identified by RDS information this time. Luckily, Czech, German, Austrian, Swedish and Hungarian national broadcasters have excellent audio archives which are a huge support in identification of the stations. Various playlists were also used for this purpose. Anyway, I'm satisfied with the results.

A recent theory of meteor trail plasma diffusion made the novel prediction that meteor trails diffuse much faster during daylight hours than at night. This occurs because the plasma density of the background ionosphere increases by up to a factor of 100 with sunrise. [Meteor Trails in the Ionosphere: Latest Results from Observations and Theory, M. M. Oppenheim, G. Suger, E. N. Bass, Y.  S. Dimant, Sigrid Close and Lars P. Dyrud]. Be that as it may, my loggings are too scanty to be an argument for some serious conclusions. However, I didn't find any dependency between time of the day and average duration of bursts for now.

By the way, here one can see signal of Svitle Radio Emmanuil pirate relay on 88.0 MHz, but that's a topic for one of the next posts.

Stations from 11 countries were received by means of meteor scatter with hop distances up to ~2110 km and identified.  The following table includes all identified broadcasters during MS observations 12.08.2020 - 16.08.2020 grouped by dates:

12.08.2020

20:46	91.20	MHz	S	SR P2	Halmstad/Oskarström (tent.)	60	kW	1350	km	309	°
20:46	92.00	MHz	POL	PR 2 (tent.)	Suwałki/G. Krzemianucha	30	kW	670	km	312	°
20:46	92.10	MHz	S	SR P2	Nässjö (tent.)	60	kW	1300	km	314	°
20:51	90.20	MHz	HNG	MR 1 Kossuth Rádió	Nagykanizsa/Újudvar	50	kW	1070	km	252	°
21:31	88.80	MHz	CZE	ČRo Sever	Ústí nad Labem/Buková hora	100	kW	1140	km	278	°

13.08.2020

16:04	88.50	MHz	CZE	ČRo Radiožurnál	Trutnov/Černá hora	16	kW	1040	km	277	°
16:04	89.30	MHz	D	hr3	Großer Feldberg (Taunus)	100	kW	1560	km	278	°
16:14	88.70	MHz	D	Bayern 2	Grünten (Allgäu)	100	kW	1500	km	266	°
16:14	89.50	MHz	D	Bayern 2	Wendelstein	100	kW	1370	km	265	°
19:27	89.10	MHz	G	BBC Radio 2	Wrotham (tent.)	250	kW	2110	km	285	°
19:27	91.30	MHz	G	BBC Radio 3 (tent.)	Wrotham (tent.)	250	kW	2110	km	285	°
19:47	88.80	MHz	CZE	ČRo Sever	Ústí nad Labem/Buková hora	100	kW	1140	km	278	°
19:52	91.50	MHz	D	MDR JUMP	Brocken	100	kW	1390	km	284	°
20:00	87.60	MHz	HNG	MR 1 Kossuth Rádió	Győr/Szabadhegy	7.6	kW	980	km	257	°
20:17	88.80	MHz	CZE	ČRo Sever	Ústí nad Labem/Buková hora	100	kW	1140	km	278	°
20:17	90.50	MHz	CZE	ČRo Hradec Králové	Trutnov/Černá hora	20	kW	1040	km	277	°
20:33	92.00	MHz	D	SWR 2	Donnersberg	60	kW	1610	km	276	°

14.08.2020

10:03	90.40	MHz	AUT	Hitradio Ö3	Klagenfurt 1	100	kW	1300	km	258	°
10:03	91.20	MHz	AUT	Ö1	Graz 1/Schöckl	80	kW	1150	km	258	°
10:28	88.20	MHz	D	NDR Kultur (tent.)	Rostock-Toitenwinkel	160	kW	1310	km	296	°
10:28	90.50	MHz	D	NDR 1 Radio MV	Helpterberg	100	kW	1200	km	293	°
10:28	91.00	MHz	D	NDR 1 Radio MV	Rostock-Toitenwinkel	100	kW	1310	km	296	°
10:28	91.90	MHz	D	NDR 2	Bungsberg	50	kW	1400	km	295	°
10:28	92.00	MHz	POL	PR Radio Szczecin (tent.)	Szczecin/Kołowo	60	kW	1130	km	293	°
16:34	89.40	MHz	S	SR P1	?	?	kW	????	km	???	°
16:40	89.40	MHz	S	SR P1	?	?	kW	????	km	???	°
18:12	89.40	MHz	S	SR P1	?	?	kW	????	km	???	°
18:13	89.70	MHz	HRV	HRT-HR 1	Biokovo/Sveti Jure	80	kW	1280	km	238	°
18:45	90.00	MHz	GRC	ERA 2 Deutero Programma (tent.)	Thessaloniki/Hortiatis	100	kW	1230	km	211	°
18:45	92.00	MHz	GRC	ERA 3 Trito Programma	Thessaloniki/Hortiatis	100	kW	1230	km	211	°
19:15	90.10	MHz	D	SWR 4 Baden-Württemberg	Stuttgart-Degerloch	100	kW	1540	km	272	°
19:16	91.10	MHz	CZE	ČRo Radiožurnál	České Budějovice/Kleť	78	kW	1170	km	268	°
19:30	88.80	MHz	CZE	ČRo Sever	Ústí nad Labem/Buková hora	100	kW	1140	km	278	°
19:30	90.20	MHz	D	MDR JUMP (tent.)	Inselsberg	100	kW	1410	km	280	°
19:30	90.50	MHz	CZE	ČRo Hradec Králové	Trutnov/Černá hora	20	kW	1040	km	277	°
19:30	90.90	MHz	CZE	ČRo Radiožurnál	Ústí nad Labem/Buková hora	100	kW	1140	km	278	°
19:30	92.20	MHz	D	MDR Sachsen	Dresden-Wachwitz	100	kW	1170	km	280	°

15.08.2020

10:40	91.30	MHz	D	SR 2 Kultur (tent.)	Göttelborner Höhe	100	kW	1680	km	275	°
10:40	91.40	MHz	CZE	Radio Impuls (tent.)	Plzeň/Krašov	100	kW	1230	km	275	°
22:52	89.00	MHz	FIN	YLE Radio Yksi	Haapavesi	30	kW	1560	km	351	°
22:52	88.60	MHz	FIN	YLE Radio Yksi	Pihtipudas (tent.)	50	kW	1460	km	350	°
22:52	89.90	MHz	FIN	YLE Radio Yksi	Jyväskylä	30	kW	1350	km	349	°
22:52	90.40	MHz	FIN	YLE Radio Yksi	Oulu - Uleåborg	50	kW	1650	km	352	°
22:52	91.10	MHz	FIN	YleX	Pihtipudas	50	kW	1460	km	350	°
22:52	91.30	MHz	S	SR P1	Kalix	60	kW	1780	km	350	°
22:52	91.40	MHz	FIN	YLE Radio Yksi (tent.)	Kruunupyy - Kronoby	60	kW	1540	km	347	°
22:52	91.60	MHz	FIN	YLE Radio Yksi	Kuopio	50	kW	1390	km	354	°
22:52	92.10	MHz	FIN	YleX	Mikkeli - Sankt Michel	30	kW	1260	km	353	°

16.08.2020

10:38	90.60	MHz	D	WDR 5	Teutoburger Wald/Bielstein	100	kW	1510	km	285	°
10:38	92.10	MHz	D	NDR 2	Torfhaus (Harz-West)	100	kW	1400	km	284	°
10:38	87.70	MHz	D	MDR Kultur (tent.)	Chemnitz/Geyer	100	kW	1240	km	278	°
10:38	88.80	MHz	CZE	ČRo Sever	Ústí nad Labem/Buková hora	100	kW	1140	km	278	°
10:38	89.50	MHz	D	hr3 (tent.)	Hoher Meißner	100	kW	1450	km	282	°
10:38	90.20	MHz	D	MDR JUMP	Inselsberg	100	kW	1410	km	280	°
10:38	90.50	MHz	CZE	ČRo Hradec Králové	Trutnov/Černá hora	20	kW	1040	km	277	°
10:38	90.80	MHz	D	Deutschlandfunk Kultur	Cottbus/Calau	20	kW	1160	km	284	°
10:38	90.90	MHz	CZE	ČRo Radiožurnál	Ústí nad Labem/Buková hora	100	kW	1140	km	278	°
10:38	91.10	MHz	D	NDR 1 Niedersachsen	Steinkimmen	100	kW	1540	km	290	°
10:38	91.50	MHz	D	MDR JUMP	Brocken	100	kW	1390	km	284	°
10:38	91.60	MHz	D	SWR3	Koblenz/Waldesch	40	kW	1620	km	278	°
10:38	91.70	MHz	POL	PR 3 (tent.)	Częstochowa/Wręczyca	60	kW	820	km	278	°
19:15	88.60	MHz	D	NDR Info	Garz (Rügen) (tent.)	10	kW	1240	km	297	°
19:15	92.20	MHz	DNK	DR P4 Sjælland	Nakskov	30	kW	1390	km	299	°

All the stations were identified by playlists, podcasts, or parallel frequencies. Power values are ERP, distances are approximate.

RX: Airspy Mini SDR

ANT: 80 mb dipole