https://www.fm-world.it/news/22-anni-fa-la-nascita-di-fm-world-oggi-con-22hbg/
di Nicola Franceschini
Associazione Italiana Radioascolto www.air-radio.it - info@air-radio.it LEGGI LA RIVISTA RADIORAMA WEB SU: WWW.AIR-RADIO.IT La collaborazione al Blog AIR Radiorama e' aperta a tutti gli appassionati, previa richiesta di iscrizione tra gli Autori. Il CD AIR si riserva il diritto insindacabile di decidere l'ammissione degli Autori e la pubblicazione sul Blog dei relativi articoli inviati.
venerdì 5 giugno 2020
22 anni fa la nascita di FM-world, oggi con 22HBG
https://www.fm-world.it/news/22-anni-fa-la-nascita-di-fm-world-oggi-con-22hbg/
di Nicola Franceschini
SDR live webminar on SDRplay topics
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2a.
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martedì 2 giugno 2020
WRTH A20 Bargraph Frequency Guide
WRTH A20 Bargraph Frequency Guide
Now Available - Buy your CD or Download today!
We are delighted to announce the availability of the new WRTH Bargraph Frequency Guide for the A20 season. The CD contains the complete, and monitored, A20 international broadcasts on LW, MW and SW, and fully updated domestic shortwave, displayed as a pdf colour bargraph.
There are also other pdf and xls files to help you get the most out of the Bargraph. All these files are also available on a downloadable Zip file.
If you have not yet got your copy of WRTH 2020 then why not buy one now.
Readers in the USA can also buy from Amazon.com or Universal Radio in Ohio.
The CD and Download are only available from the WRTH site. Visit our website to find out more and to order a copy.
There are also other pdf and xls files to help you get the most out of the Bargraph. All these files are also available on a downloadable Zip file.
If you have not yet got your copy of WRTH 2020 then why not buy one now.
Readers in the USA can also buy from Amazon.com or Universal Radio in Ohio.
The CD and Download are only available from the WRTH site. Visit our website to find out more and to order a copy.
We hope you enjoy using this new Frequency Guide.
Nicholas Hardyman
Nicholas Hardyman
Publisher
via Bruno Pecolatto
AIR 130
Come essere in Bielorussia - FM DXing in banda OIRT
 |
| Ecco come si presentava la banda OIRT il 31 maggio 2020 alle 15.32 UTC |
.
Gli ascolti sono stati fatti a Bocca di Magra con un SDRPlay RSP1A e una piccola antenna discone Diamond D-150. Il software utilizzato è l'SDR Console V3, che permette di registrare la banda e di riascoltarla e analizzarla con calma senza problemi. Con database delle frequenze OIRT ho utilizzato quello di FMlist con il software CSVUserlistBrowser Ciao, Giampiero Bernardini
Ecco il log:
66.020.000 BR Radio Mogilev BLR Belarus Bobruysk/RTPS Yasny Les (MA) 1741 km
66.080.000 BR Kanal Kultura BLR Belarus Svisloch (Svislac)/RTPS (HR) 1438 km
66.200.000 BR Radio Stalitsa BLR Belarus Gomel/RTPS (ul. Pushkina, 6) (GO) 1805 km
66.200.000 BR Kanal Kultura BLR Belarus Grodno (Hrodna)/RTPS (ul. Gorkogo, 85) (HR) 1470 km
66.320.000 BR Pershy Kanal BLR Belarus Pinsk/RTPS Posenichi (BR) 1492 km
66.380.000 BR Radio Stalitsa BLR Belarus Smorgon'/RTPS (HR) 1655 km
66.440.000 BR Gomel FM BLR Belarus Smetanichi/RTPS (GO) 1641 km
66.560.000 BR Pershy Kanal BLR Belarus Slonim/RTPS Novaja Strazha (HR) 1512 km
66.740.000 BR Kanal Kultura BLR Belarus Ushachy/RTPS Astravenec (VI) 1821 km
66.860.000 BR Radio Stalitsa BLR Belarus Myadzel/RTPS Telyaki (MI) 1704 km
66.890.000 BR Pershy Kanal BLR Belarus Mstislavl/RTPS (MA) 1919 km
66.980.000 BR Gomel FM BLR Belarus Gomel/RTPS (ul. Pushkina, 6) (GO) 1805 km
67.070.000 BR Radio Stalitsa BLR Belarus Berezino (Berazino)/ARTPS (MI) 1753 km
67.190.000 BR Radio Grodno BLR Belarus Smorgon'/RTPS (HR) 1655 km
67.220.000 BR Pershy Kanal BLR Belarus Smetanichi/RTPS (GO) 1641 km
67.250.000 BR Radio Mogilev BLR Belarus Kostiukovichi (Kastsiukovicy)/RTPS (MA) 1908 km
67.340.000 BR Kanal Kultura BLR Belarus Slonim/RTPS Novaja Strazha (HR) 1512 km
67.370.000 BR Pershy Kanal BLR Belarus Bragin/RTPS (GO) 1731 km
67.460.000 BR Pershy Kanal BLR Belarus Osipovichi/RTPS (MA) 1709 km
67.640.000 BR Radio Vitebsk BLR Belarus Myadzel/RTPS Telyaki (MI) 1704 km
67.850.000 BR Pershy Kanal BLR Belarus Orsha/RTPS Obukhovo (VI) 1878 km
67.880.000 BR Radio Stalitsa BLR Belarus Pinsk/RTPS Posenichi (BR) 1492 km
67.970.000 BR Pershy Kanal BLR Belarus Smorgon'/RTPS (HR) 1655 km
68.000.000 BR Kanal Kultura BLR Belarus Smetanichi/RTPS (GO) 1641 km
68.030.000 BR Kanal Kultura BLR Belarus Kostiukovichi (Kastsiukovicy)/RTPS (MA) 1908 km
68.120.000 BR Radio Grodno BLR Belarus Slonim/RTPS Novaja Strazha (HR) 1512 km
68.300.000 BR Radio Vitebsk BLR Belarus Ushachy/RTPS Astravenec (VI) 1821 km
68.390.000 BR Kanal Kultura BLR Belarus Geranyony/RTPS (HR) 1587 km
68.450.000 BR Gomel FM BLR Belarus Zhlobin/RTPS (ul. Marksa 1a) (GO) 1768 km
68.480.000 BR Radio Grodno BLR Belarus Mosty (Masty)/ARTPS (HR) 1491 km
68.570.000 BR Radio Stalitsa BLR Belarus Soligorsk/RTPS Dubei (MI) 1607 km
68.690.000 BR Pershy Kanal BLR Belarus Myadzel/RTPS Telyaki (MI) 1704 km
68.720.000 BR Radio Stalitsa BLR Belarus Svisloch (Svislac)/RTPS (HR) 1438 km
68.900.000 BR Radio Stalitsa BLR Belarus Grodno (Hrodna)/RTPS (ul. Gorkogo, 85) (HR) 1470 km
68.960.000 BR Kanal Kultura BLR Belarus Bobruysk/RTPS Yasny Les (MA) 1741 km
68.960.000 BR Kanal Kultura BLR Belarus Bobruysk/RTPS Yasny Les (MA) 1741 km
68.960.000 BR Kanal Kultura BLR Belarus Bobruysk/RTPS Yasny Les (MA) 1741 km
69.080.000 BR Radio Brest BLR Belarus Pinsk/RTPS Posenichi (BR) 1492 km
69.260.000 BR Radio Stalitsa BLR Belarus Geranyony/RTPS (HR) 1587 km
69.380.000 BR Radio Stalitsa BLR Belarus Kostiukovichi (Kastsiukovicy)/RTPS (MA) 1908 km
69.440.000 BR Radio Brest BLR Belarus Slonim/RTPS Novaja Strazha (HR) 1512 km
69.680.000 BR Radio Brest BLR Belarus Brest/RTPS Rakitnica (BR) 1371 km
69.800.000 BR Radio Stalitsa BLR Belarus Drogichin (Drahichyn)/RTPS Sirenevka (BR) 1442 km
69.920.000 BR Kanal Kultura BLR Belarus Vitebsk/RTPS Jurjeva Gorka (VI) 1898 km
70.100.000 BR Radio Mogilev BLR Belarus Mogilev (Mahilyow)/RTPS Polykovichi (MA) 1839 km
70.130.000 BR Kanal Kultura BLR Belarus Smorgon'/RTPS (HR) 1655 km
70.220.000 BR Pershy Kanal BLR Belarus Soligorsk/RTPS Dubei (MI) 1607 km
70.280.000 BR Radio Stalitsa BLR Belarus Smetanichi/RTPS (GO) 1641 km
70.310.000 BR Kanal Kultura BLR Belarus Myadzel/RTPS Telyaki (MI) 1704 km
70.340.000 BR Pershy Kanal BLR Belarus Krichev (Krychaw)/ARTPS (MA) 1905 km
70.430.000 BR Kanal Kultura BLR Belarus Minsk/RTPS Kolodischi (MI) 1695 km
70.670.000 BR Pershy Kanal BLR Belarus Vitebsk/RTPS Jurjeva Gorka (VI) 1898 km
70.760.000 BR Radio Stalitsa BLR Belarus Mosty (Masty)/ARTPS (HR) 1491 km
70.760.000 BR Kanal Kultura BLR Belarus Trokeniki/ARTPS (HR) 1649 km
70.790.000 BR Pershy Kanal BLR Belarus Berezino (Berazino)/ARTPS (MI) 1753 km
70.850.000 BR Radio Stalitsa BLR Belarus Lyubcha/ARTPS (HR) 1588 km
70.910.000 BR Radio Mogilev BLR Belarus Osipovichi/RTPS (MA) 1709 km
70.940.000 BR Radio Stalitsa BLR Belarus Ushachy/RTPS Astravenec (VI) 1821 km
70.970.000 BR Kanal Kultura BLR Belarus Kopyl' (Kapyl')/ARTPS (MI) 1606 km
71.030.000 BR Kanal Kultura BLR Belarus Zhlobin/RTPS (ul. Marksa 1a) (GO) 1768 km
71.180.000 BR Radio Stalitsa BLR Belarus Mogilev (Mahilyow)/RTPS Polykovichi (MA) 1839 km
71.330.000 BR Pershy Kanal BLR Belarus Minsk/RTPS Kolodischi (MI) 1695 km
71.450.000 BR Pershy Kanal BLR Belarus Bobruysk/RTPS Yasny Les (MA) 1741 km
71.480.000 BR Radio Vitebsk BLR Belarus Vitebsk/RTPS Jurjeva Gorka (VI) 1898 km
71.540.000 BR Radio Grodno BLR Belarus Geranyony/RTPS (HR) 1587 km
71.690.000 BR Kanal Kultura BLR Belarus Brest/RTPS Rakitnica (BR) 1371 km
71.810.000 BR Radio Stalitsa BLR Belarus Zhlobin/RTPS (ul. Marksa 1a) (GO) 1768 km
71.960.000 BR Kanal Kultura BLR Belarus Mogilev (Mahilyow)/RTPS Polykovichi (MA) 1839 km
72.140.000 BR Pershy Kanal BLR Belarus Drogichin (Drahichyn)/RTPS Sirenevka (BR) 1442 km
72.230.000 BR Kanal Kultura BLR Belarus Soligorsk/RTPS Dubei (MI) 1607 km
72.260.000 BR Radio Stalitsa BLR Belarus Vitebsk/RTPS Jurjeva Gorka (VI) 1898 km
72.320.000 BR Pershy Kanal BLR Belarus Geranyony/RTPS (HR) 1587 km
72.470.000 BR Radio Stalitsa BLR Belarus Brest/RTPS Rakitnica (BR) 1371 km
72.650.000 BR Pershy Kanal BLR Belarus Ushachy/RTPS Astravenec (VI) 1821 km
72.740.000 BR Pershy Kanal BLR Belarus Mogilev (Mahilyow)/RTPS Polykovichi (MA) 1839 km
72.890.000 BR Radio Stalitsa BLR Belarus Minsk/RTPS Kolodischi (MI) 1695 km
73.010.000 BR Radio Stalitsa BLR Belarus Bobruysk/RTPS Yasny Les (MA) 1741 km
67.130.000 Radio Mayak RUS Russian Federation Smogiri/RTPS (SM) 2011 km
----- Non bielorusse -----
68.540.000 Radio Rossii RUS Russian Federation Smolensk/RTPS (SM) 1979 km
68.960.000 Radio Rossii RUS Russian Federation Smogiri/RTPS (SM) 2011 km
68.240.000 Radio Mariya v Ukraini UKR Ukraine Antopil'/RFKRRT, vul. Kyivs'ka, 12 (RI) 1433 km
lunedì 1 giugno 2020
Il Sole ha fatto un'altro bel "ruttino" .....
Il 9 Marzo il sole fece uno strarnuto dopo dieci mesi :
http://air-radiorama.blogspot.com/2020/03/il-sole-ha-starnutito-dopo-dieci-mesi.html
Il 29 Maggio recente ha fatto un "ruttino" ...
Forse si sta risvegliando piano piano ?
Radio Events Observed 29 May 2020
A. 245 MHz Bursts
Start End Peak Flux Time of Peak Duration
0724 0724 220 0724 0000
1048 1048 140 1048 0000
B. 245 MHz Noise Storms
No 245 MHz Noise Storms Observed.
il 30 verso sera Emanuele Pelicoli mi manda una registrazione di un'apertura in E sporadico
in Banda OIRT e dice che c'erano aperure anche fino alla banda dei 2 metri .
"Mission Impossible in the Dream Band "
During this month I have started some experiments broadcasting a steady carrier in the Dream Band at 8270.020 Hz .
The antenna is a Ground Dipole ( or probably better a Ground Loop ) as in the picture .
I buried for 1.5m on the ground in my garden two special poles spaced 45m in the direction N/S .
The antenna is of course very inefficient being a very small fraction of the WL ( Wave Lenght) that is around 26km .
Also the power supplied ( and dissipated , rather than radiated ) to the antenna system is small , in the range of 50 Watts .
Here you can see the peak to peak voltage and current at the antenna input .
Current is sensed with a resistor of 1 Ohm 5W .
The schematic of the I-V sensing was taken from Renato Romero article :
http://www.vlf.it/ed/earthprobes.html
Calculation shows a power rms input around 58 W .
The power amplifier is an analog class AB audio amplifier with Mosfets , powered with differential power supply +/- 25V that I found somewhere on a flea Ham market many years ago and used ,cutting the feedback , for tests in the 136 KHz Band .
I put a couple of fans on the heater for having 24h operation .
What is important is that the frequency of the carrier is very stable because generated from an HP double OCXO ( Oven Cristal Oscillator ) disciplined with GPS HP5850 A shown in the following picture together with the Arbitrary Waveform Generator Synthesizer .
The specs of the frequency reference :
https://www.sglabs.it/public/HP58503A.pdf
This Frequency/Phase high stability was one of the key of success of this "Mission impossible" .
With "normal grabbers spectrograms " , we was even not able at the beginning to say surely that the signal was detectable in Cumiana that is around one WL from my QTH , till Paul Nicholson , a VLF guru , started to record and analyze the streaming of the signal coming in real time from Cumiana , using samples lasting some hours .
At this stage the signal popped out clearly from the noise at the right frequency as shown in the picture after 50hours in a BW of 5.3 uHz .
As you can see the " span " of the spectrum mean for 50 hours is 2 mHz and the RBW ( Resolution BandWidth is 5.3 uHz ( microhertz = 1 Hz / 1000000 ) .
Impossible to do without a very precise frequency/phase reference of both RX and TX sites .
At this stage , encouraged from the results , Paul decided to put on the web the possibility to postprocess in real time from everyone the signals recorded on air from the stations that are sending to his elaboration center the signals received .
Here you can use this marvelous tool from his extreme site : http://abelian.org/
The tool :
http://78.46.38.217/fbins3.html#r=vlf1&p=1591009200&b=000&s=sp&m=cardioid&w=r&h=62&z1=0.34&z2=0.64&c=1
Just for fun we tried to see the signals at Bielefeld ( Germany ) and being surprised that there was clear sign of the signal on the right frequency .
Again for fun we got some signs that maybe something was also received at the QTH of Paul in Todmorden at around 1200 km of distance from my QTH in Turin .
To be sure about , Paul pushed very hard on many algorithm of noise and interference suppression , compensate the different delay of propagation between night and day , cut out part of the signal where another transmission on the same frequency was present and patiently waited that the very very small signal increased at the right frequency during the time .
As much as you can wait time , you can decrease the bandwidth to better extract the signal from noise and interference .
After nearly 5.5 days of elaboration the following spectrum popped out very well also at Todmorden :
Please note the calibrated vertical linear scale of Field Strength : nV/m ( nanovolt/m ), this means some electrons being received ...., but especially the horizontal frequency scale with a total span of 1.2 mHz and 0.05 mHz/div = 50 uHz/div !
If you look how many signal you can isolate in one division , we can roughly estimate the RBW of the spectrum analysis in 0.0025 mHz , that is 2.5uHz .
Something very extreme , but at the end the satisfaction for everyone to have demonstrate how the processing techniques can hardly dig to make very low signals popping out from the noise .
What we have broadcasted ?
1bit in around 5.5 days ......
This is not the longer detection in this band .
Other have made even intercontinental TX-RX , but with much bigger EIRP and broadcasting at much higher bit rates .
Milestones in this field are reported here from Paul :
http://abelian.org/vlf/amateur-radio/
The "Mission Impossible" here was to use extreme postprocessing techniques to allow to receive/recognize with no doubt a far signal with extremely low EIRP ( Ultra QRP ... ) .
Here is the official announcement on the VLF list : https://groups.io/g/VLF/topics from Paul :
Da: paul@...
Data: 30-mag-2020 10.41
A: <VLF@groups.io>
Ogg: Re: [VLF] Transmitting at 8720.020 Hz with a new antenna
I have decided to claim detection of Claudio's ultra-QRP signal
at 8270.02 Hz.
http://abelian.org/vlf/tmp/200530-i1rfq.png
Frequency is exact;
Strongest peak in 24000 bins excluding the other known amateur
signals;
The S/N continues to improve as more data is added;
Azimuth is correct (GC is 139.8 deg, peak S/N 143 deg);
Partitioning the data gives the same peak;
Paul Nicholson
For future improvements I have placed a remote station at the QTH of Rodolfo Zucchetti that is around 700m from my QTH .
The RX antenna is a Wideband L101ES connected to the audio Sound card of a laptop , with HDSDR and Anydesk .
With an RBW of 0.1 Hz ( looks small , but it is 100000 uHz !) the S/N is around 20 dB ....
With a CW demodulator , event with the smallest filter , you can't listen the carrier .
The antenna is a Ground Dipole ( or probably better a Ground Loop ) as in the picture .
The antenna is of course very inefficient being a very small fraction of the WL ( Wave Lenght) that is around 26km .
Also the power supplied ( and dissipated , rather than radiated ) to the antenna system is small , in the range of 50 Watts .
Current is sensed with a resistor of 1 Ohm 5W .
The schematic of the I-V sensing was taken from Renato Romero article :
http://www.vlf.it/ed/earthprobes.html
Calculation shows a power rms input around 58 W .
The power amplifier is an analog class AB audio amplifier with Mosfets , powered with differential power supply +/- 25V that I found somewhere on a flea Ham market many years ago and used ,cutting the feedback , for tests in the 136 KHz Band .
I put a couple of fans on the heater for having 24h operation .
What is important is that the frequency of the carrier is very stable because generated from an HP double OCXO ( Oven Cristal Oscillator ) disciplined with GPS HP5850 A shown in the following picture together with the Arbitrary Waveform Generator Synthesizer .
The specs of the frequency reference :
https://www.sglabs.it/public/HP58503A.pdf
The overall schematic of the transmitting system is the the following picture :
This Frequency/Phase high stability was one of the key of success of this "Mission impossible" .
With "normal grabbers spectrograms " , we was even not able at the beginning to say surely that the signal was detectable in Cumiana that is around one WL from my QTH , till Paul Nicholson , a VLF guru , started to record and analyze the streaming of the signal coming in real time from Cumiana , using samples lasting some hours .
At this stage the signal popped out clearly from the noise at the right frequency as shown in the picture after 50hours in a BW of 5.3 uHz .
As you can see the " span " of the spectrum mean for 50 hours is 2 mHz and the RBW ( Resolution BandWidth is 5.3 uHz ( microhertz = 1 Hz / 1000000 ) .
Impossible to do without a very precise frequency/phase reference of both RX and TX sites .
At this stage , encouraged from the results , Paul decided to put on the web the possibility to postprocess in real time from everyone the signals recorded on air from the stations that are sending to his elaboration center the signals received .
Here you can use this marvelous tool from his extreme site : http://abelian.org/
The tool :
http://78.46.38.217/fbins3.html#r=vlf1&p=1591009200&b=000&s=sp&m=cardioid&w=r&h=62&z1=0.34&z2=0.64&c=1
Just for fun we tried to see the signals at Bielefeld ( Germany ) and being surprised that there was clear sign of the signal on the right frequency .
Again for fun we got some signs that maybe something was also received at the QTH of Paul in Todmorden at around 1200 km of distance from my QTH in Turin .
To be sure about , Paul pushed very hard on many algorithm of noise and interference suppression , compensate the different delay of propagation between night and day , cut out part of the signal where another transmission on the same frequency was present and patiently waited that the very very small signal increased at the right frequency during the time .
As much as you can wait time , you can decrease the bandwidth to better extract the signal from noise and interference .
After nearly 5.5 days of elaboration the following spectrum popped out very well also at Todmorden :
Please note the calibrated vertical linear scale of Field Strength : nV/m ( nanovolt/m ), this means some electrons being received ...., but especially the horizontal frequency scale with a total span of 1.2 mHz and 0.05 mHz/div = 50 uHz/div !
If you look how many signal you can isolate in one division , we can roughly estimate the RBW of the spectrum analysis in 0.0025 mHz , that is 2.5uHz .
Something very extreme , but at the end the satisfaction for everyone to have demonstrate how the processing techniques can hardly dig to make very low signals popping out from the noise .
What we have broadcasted ?
1bit in around 5.5 days ......
This is not the longer detection in this band .
Other have made even intercontinental TX-RX , but with much bigger EIRP and broadcasting at much higher bit rates .
Milestones in this field are reported here from Paul :
http://abelian.org/vlf/amateur-radio/
The "Mission Impossible" here was to use extreme postprocessing techniques to allow to receive/recognize with no doubt a far signal with extremely low EIRP ( Ultra QRP ... ) .
Here is the official announcement on the VLF list : https://groups.io/g/VLF/topics from Paul :
Da: paul@...
Data: 30-mag-2020 10.41
A: <VLF@groups.io>
Ogg: Re: [VLF] Transmitting at 8720.020 Hz with a new antenna
I have decided to claim detection of Claudio's ultra-QRP signal
at 8270.02 Hz.
http://abelian.org/vlf/tmp/200530-i1rfq.png
Frequency is exact;
Strongest peak in 24000 bins excluding the other known amateur
signals;
The S/N continues to improve as more data is added;
Azimuth is correct (GC is 139.8 deg, peak S/N 143 deg);
Partitioning the data gives the same peak;
Paul Nicholson
For future improvements I have placed a remote station at the QTH of Rodolfo Zucchetti that is around 700m from my QTH .
The RX antenna is a Wideband L101ES connected to the audio Sound card of a laptop , with HDSDR and Anydesk .
With an RBW of 0.1 Hz ( looks small , but it is 100000 uHz !) the S/N is around 20 dB ....
With a CW demodulator , event with the smallest filter , you can't listen the carrier .
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