Visualizzazione post con etichetta BCL. Mostra tutti i post
Visualizzazione post con etichetta BCL. Mostra tutti i post

venerdì 16 settembre 2016

DXPatrol news SDR

  • Full coverage reception form 100KHz to 2GHz SDR
  • Independent antenna inputs for Shortwave and VHF
  • USB computer connection ( micro-usb)
  • Very High dynamic range receiver
  • Low noise pin-diode band switch
  • Accurate and efficient band filters
  • Very clean audio reception
  • SMA golden antenna connectors
  • LED power and band indication
  • 40MHz local oscillator for HF conversion
  • DBM balance diode ring mixer
  • Small size board
  • Freeware software
  • Up to 3.2 M Sample rate
  • OTG USB cable Included 
  • SMA-BNC adaptor Included










Claudio Bianco, IK1XPK.

domenica 7 agosto 2016

Mucche al posto delle antenne



Sparisce uno degli ultimo siti in Italia  ? Mucche al posto delle antenne questo è quello che pensa di fare il Vaticano per il sito si Radio Vaticana di Santa Maria di Galeria cioè, smantellare il sito e convertirlo a un sito dedicato all'allevamento e all'agricoltura.


Gli articoli d del Portale di Italradio   e  Repubblica.it

http://portale.italradio.org/index.php?module=News&func=display&sid=2842

http://ricerca.repubblica.it/repubblica/archivio/repubblica/2013/08/26/un-allevamento-di-mucche-al-posto-delle.html



Claudio Bianco (IK1XPK).




martedì 24 maggio 2016

Notte di radioascolto a Forno di Coazze (TO)

Nel weekend 21-22 maggio 2016 si è svolto un campo DX sulle rive del torrente Sangone, a pochi km da Torino, nei locali, gentilmente messi a disposizione da Claudio Re e Fabrizio Francione, dove da tempo è stato installato un osservatorio dell’attività solare (per info www.sidmonitor.net ).

Molto positivo il bilancio globale, grazie all’ambiente privo di disturbi, con discreta propagazione da est già dal primo pomeriggio.

Che pace in Val Sangone ... (foto di R. Zucchetti)

Quattro chiacchiere sotto l'antenna (foto di R. Zucchetti)


Utilizzando una antenna Maxi Whip da 12 m e vari ricevitori (AOR 7030, Tecsun PL-660 e SDRPlay) io e l'amico Rodolfo Zucchetti ci siamo divertiti a spazzolare in primo luogo le bande broadcasting.

Ecco alcuni esempi:

1423- 9345 21/05/2016 PHL FEBC Manila – Px parlato in C 44444
1425- 9430 21/05/2016 PHL FEBC Manila – Px mx leggera in C 44444
1427 9510 21/05/2016 THA BBC WS via Nakhon Sawan – Px parlato in Hindi 44444
1430- 9620 21/05/2016 IND AIR, Aligarh – Nx in Sindhi 44444
1448- 9910 21/05/2016 GUM KTWR, Merizo – Px parlato in Coreano 44444
1452- 9960 21/05/2016 PLW Furusato no Kaze via Medorn – Px in giapponese 44444
1500- 9975 21/05/2016 PLW Nippon no Kaze via Medorn – Px in giapponese 44444
1818- 4835 21/05/2016 AUS ABC Northern Territory, Alice Springs – Px in E 34222
1824- 11735 21/05/2016 TZA Zanzibar BC, Dole – Px in Swahili 34222
1829- 12065 21/05/2016 AUS R. Australia, Shepparton – Px mx in E 34333
1837- 6195 21/05/2016 OMA BBC WS via Al Seela – Px sportivo in E 44444
1843- 6080 21/05/2016 BOT VoA via Moepeng Hill – Px mx afro in E 44333
1866- 5865 21/05/2016 KWT R. Farda via Umm al-Rimam – Px mx in Farsi 44444
2008- 4820 21/05/2016 CHN PBS Xizang, Lhasa, Tibet – Px mx in C 44333
2013- 9390 21/05/2016 THA R. Thailand, Udon Thani – Px in G, ID in E, S/OFF 44444
2017- 9155 21/05/2016 TWN Sound of Hope, Taipei – Px parlato in C 34333
2228- 5940 21/05/2016 B R. Voz Missionaria, Camboriu, SC – Px parlato in P 34222
2237- 11680 21/05/2016 KRE KCBS, Kanggye – Px parlato in Coreano 44333
2244- 4870 21/05/2016 INS RRI Wamena, Wamena – Px mx 24222
2251- 4875.1 21/05/2016 B R. Difusora Roraima, Boa Vista RR – Px in P 24222
2254- 4885 21/05/2016 B R. Clube do Para, Belem PA – Px parlato in P 34222
2257- 4949.7 21/05/2016 AGL R. Nacional, Mulenvos – px mx in P 24222
2302- 5025 21/05/2016 CUB R. Rebelde, La Habana – ID, nxs in S 34333
2304- 5040 21/05/2016 CUB R. Habana Cuba, Bauta – Px attualità in S 34333
2306- 5130 21/05/2016 USA WBCQ, Monticello, ME – Px religioso in E 24222






Personalmente mi sono poi dedicato alla mia recente passione ovvero la ricezione sulle bande radioamatoriali nei modi digitali come il PSK (affollatissimo l'annuale EU PSK DX Contest) e JT65 (diversi gli OM giapponesi ricevuti nel giro di pochi minuti).

Poter avere uno schermo così anche a casa, in citta !


Grazie a tutti quelli che hanno fornito il supporto tecnico, logistico e … gastronomico !

Valerio Cavallo


domenica 24 aprile 2016

Radio Marconi International HISTORY - NEWSLETTER


HISTORY OF MRI
Dear listeners! We always appreciate receiving your feedback. Good or bad. Either way it’s vital we know what you think about MRI. We also encourages reception reports from listeners. Audio clips (mp3-file) of our broadcasts are welcome! We QSL 100%. Our E-mail address is: marconiradiointernational@gmail.com
HISTORY OF MRI 
The idea of starting a new radio station originated in the summer of 1985. The announcement "This is Marconi Radio International" was carried for the first time over the air on 4th January 1986. However the first real test transmission was broadcast on 1st November 1985 with a power of only 2 watts on 11426 kHz. On 22nd March 1987 MRI aired its last transmission marking the end of 14 months of programming because of staff shortage.
During the first 21 months after that, there were no short wave transmission and resumption of MRI was often a subject of debate among its founders. In December 1988 we began making a plan to get MRI back on the air. The plan got so far that regular test transmissions were started from a new transmitter site but it was deleted again in March 1989 after reports of interference caused to TV signals.
In the summer of 1990 despite an announcement appeared in the DX press we made no test transmission. On 25th December 1991 we aired from our original transmitter site a 3 hour special Christmas test broadcast, which was publicized in advance by widely-heard shows about media, communications technology and DXing, like "Media Network" (Radio Netherlands) and "Kurzwellen Panorama" (Radio Austria International).
The reaction from listeners was prompt and highly positive. The first reception report was received on 31st December from an Italian listener. Other reports came during the following days from Austria, France, Germany, United Kingdom and, for the first time in our history, from Belgium.
We were surprised that letters not only came in response to our Special Christmas broadcast but also to our unscheduled test transmissions on 24th December, 1991, made only to check the transmitter together with the antenna.
On 26th April 1992, a week later than originally planned MRI, in cooperation with some DX clubs of Italy, aired another special broadcast. The results were good with over 30 reception reports from Austria, Bulgaria, Denmark, France, Germany, Italy, Spain, Switzerland and UK.
A third special joint transmission between MRI and some DX clubs of Italy was made on 3rd January 1993 from 0930 to 1230 UTC to mark the seventh station’s anniversary. The response to this broadcast, which included a DX show looking back on MRI’s history since 1986, was good with 35 reception reports received from listeners in Austria, France, Germany, Italy, Spain, Switzerland and United Kingdom. Additionally, rock and black music interspersed with
bilingual announcements in Italian and English was played. Those listeners who were able to hear this special broadcast and sent a reception report to us received a special QSL verification.
The last spell of regular Sunday morning test broadcasts of 20th century, with reception reports coming from Finland, France, Germany, Czech Republic, Russia, Spain and Sweden, began on 21st February 1999 and lasted until May 1999. At that time we were on the air from 0700 to 0915 UTC with a DX show in English at 0745 and 0800 followed by a longer version in Italian. Since then there has been any broadcast until 15th August 2015.
Marconi Radio International (MRI) celebrated its 30th anniversary on 4 January 2016. To mark this milestone, we carried over the air (on both 3 and 4 January 2016) a special programme in Italian, with details on the history of MRI and interviews with two well-known short wave personalities of Italy: Dario Monferini, editor of “Play DX” (the most famous and long lived short wave bulletin in Italy) and Roberto Scaglione, who produces and presents “Studio DX” the only radio show in Italian about media and DXing remained in life. They explained how, from their point of view, the short wave radio scene has changed during the last three decades. Also our playlist had something special as only songs with the word "Radio" in their title were played. Besides that we also carried over the air two vintage shows of ours. A special 30th anniversary QSL verification was issued to acknowledge reports about reception of all MRI broadcasts aired in January 2016.

On 13 February 2016, Marconi Radio International celebrated the role of free shortwave radio on the occasion of World Radio Day. That's why we produced, in cooperation with other two free radios of Italy, Radio Europe and IBC – Italian Broadcasting Corporation, a special one hour show in Italian which included interviews with people behind the operation of these three free radios. Never before in its history MRI participated in a venture of this kind with other free radio stations of Italy.
A few days later, the idea of using airtime provided by another free radio began to take shape. On 29 February 2016 the idea came true as free broadcast airtime was provided by IBC – Italian Brodcasting Corporation to MRI. For the first time in our history our pre-recorded programmes were carried over the transmitter of another free radio. This special leap day transmission, was on the air from 0800 to 1100 UTC on 6970 kHz with a power of about 700 watts. The same contents were also broadcast from our own transmitter site, from 0930 to 1300 on 11390 kHz.
On 21 March 2016 a new transmitter was added and for the first time in our history a test was made outside the 11 MHz band. We used the frequency of 7700 kHz (USB mode) which gave good reception in Europe. The station was also
heard in New Foundland in Canada. This was the first time we received a correct reception report along with an audio clip from a listener outside Europe who was using his own receiver and antenna.

MRI’S AIM
The general objective of MRI, given by its founders, was to be a radio for the DXers. Our policy was to provide DXers with whatever they want: a lot of interesting tips and DX news. Music also played an important role in our broadcasts. Not only we aired programmes devoted to the world of radio but also many kinds of black and rock music from blues to reggae, punk to heavy metal, garage and psychedelia. Unlike most of other free radios, MRI provided the chance of featuring music by "indie" bands (less well-known artists signed to independent record companies) as well as musicians and kinds of music usually destined to remain minority interest.
During the first few months of its operation, we received reception reports from listeners living in Austria, Czechoslovakia, Denmark, Federal Republic of Germany, Finland, France, German Democratic Republic, Holland, Italy, Spain, Sweden, Switzerland and United Kingdom.
The station name was chosen by our engineer and co-founder, who commented that never before in Italy a short wave radio had got its name from Guglielmo Marconi the inventor of wireless telegraphy and therefore the foremost pioneer of radio communication born in our country!

TECHNICALLY SPEAKING
MRI still uses a nearly "QRP" transmitter built by our engineer in 1985. It has the capability of tuning between 11 and 12 MHz and can be Xtal or VFO driven and believe it or not, it has never failed. The carrier generator which is all solid state, delivers a power output of around 30 watts without modulation and uses "general purposes" transistors like the "BD 106" or the power transistors "BD 111".
The modulator is also all solid state and uses the power transistors "2 N 3055" rather than the usual transformer. The output of the transmitter is fed through a 52 ohms RG8/U coaxial line to some inverted "V" half-wave dipole antennas. On 21 March 2016 a second transmitter with a power of 40 watts (AM) and 100 (SSB mode) was put into service and, for the first time in our history, a test broadcast outside the 11 MHz band was aired.

HOW WE SEE SHORT WAVE FUTURE
With the disappearance from the bands of a lot of international and domestic broadcasters many things have changed for shortwave listeners in the last 15 years. Despite this, we still see shortwave broadcasting as 30 years ago. We wish that SWLs and DXers of the world unite, by sending their contributions to the few still alive DX publications and clubs, and by keeping a regular contact with radio stations, rather than playing an individual and self-referential role on social networks or personal blogs.
We still rely on listeners and are really interested in knowing how reception has been in their area. We don’t verify reception report as an act of courtesy but only after checking them with our station log and found they are fully correct. Unlike a number of free radios from Northern of Europe we know what a QSL is and our verifications will always come with ALL details about reception of MRI. We plan to send in future printed QSL cards by snail-mail to some lucky listeners. That’s why it’s vital to include your postal address in your reception reports sent via e-mail to us.
The aim of MRI, 30 years after its first broadcast, is and has always been, to be at shortwave listener’s service. We try to do this at our best even if we have small staff and limited resources at our disposal.
That’s all for now, 73’s
Marconi Radio International (M.R.I.) old-style free short wave radio from Italy




HALLO WORLD. THIS IS MARCONI RADIO INTERNATIONAL
(MRI NEWSLETTER nr. 4 – April 2016. Feedbacks to: marconiradiointernational@gmail.com) 

A wind of change is sweeping through MRI. As from 3 May 2016 we’ll be on air regulary on Wednesdays on 7690 kHz USB mode with 100 watts in the evening.
A wind of change is sweeping through Marconi Radio International (MRI). This newsletter nr. 4 offer us the chance to announce the addition of a new transmitter, with the capability of tuning from 3 to 30 MHz. We are very proud that we have been able to make this step as well as to increase our power from 30 to 100 watts. Our listeners have waited long time for this news and we are happy to see the first positive comments. “Hello MRI, good to chat you in the chatroom today. Please find a short MP3 recording of your signal on 7690 KHz USB recorded at 17:08-17:18 UTC - signal around s2-s3. This is first time I have managed to hear you - never got anything from your 11 MHz tests so very pleased to finally hear another Italian station today!! I am located in the town of Gourock on the west coast of Scotland, 25km from Glasgow on the River Clyde. My receiver is a JRC NRD-525 used with a Wellbrook ALA-1530 active loop antenna. Hopefully you can send me your eQSL for my report. I will send you a second email with another short clip. 73 . (Iain Cameron).
The first ever made test on a frequency outside the 11 MHz band was on 21 April 2016. We were on air from 2000 to 2100 hours UTC on 7700 kHz. This move from 11390 kHz to lower frequencies, as confirmed by reports received from listeners, will make reception of MRI easier and better. Until now, our first test broadcasts on 7 MHz were received from listeners living in Austria, Belgium, Bulgaria, Canada, Finland, France, Germany, Italy, Latvia, The Netherlands, Norway, Portugal, Romania, Russia, Spain, Sweden, Ukraine, United Kingdom and USA. The increasing number of E-mails and reception reports which we receive weekly shows that we can now reach a growing and above all a new audience via this new transmitter. A comparison of the number of reports received tells the story: in less than one month of transmissions on 7 MHz we have received approximately the same number of reception reports in the period August 2015-March 2016 when we used exclusively the frequency of 11390 kHz!!
It should be also mentioned that for first time in our history we received reports from SWLs outside Europe using their own equipment (not a remote websdr receiver!). The first was from Canada (Terry Toope). Here is an excerpt from his reception report: “I am located about 50 km from the most easterly point in North America (about 4500 km from Italy). (…) I am fortunate to live in a quiet area (for electrical noise), and I have large area of trees behind my house, with lots of room for antennas. I have been listening to pirate stations on shortwave and mediumwave for over 6 years, and I have become completely addicted! (I only listen to free stations.) I traveled to the Europirate summermeeting in Holland in 2010 and again in 2014. During my last trip, I also traveled through northern Italy (from Venice to Lugano via Milan by train, then Lugano to Tirano by bus. Very beautiful country. I hope that you are able to identify your signal on the audio file. If so, I would very much appreciate a QSL if you are able to confirm my reception. If you do not have a QSL, an email confirmation would also be appreciated”. Many thanks to Terry and all of our listeners who were submitting a reception report about our transmissions. As already announced in our Newsletter nr. 2 a new designed QSL is, now that a new transmitter has been adopted, in the process of being distributed to our listeners.
And what’s about the old transmitter on 11390 kHz? Well, we don’t intend to abandon it. Although this transmitter operates only on 11 MHz, a band which currently doesn’t give good reception in Italy and rest of Europe, it may be used occasionally in the future for short time segments in the morning hours. (Stay tuned for further developments!)
We have standardized our broadcasts: there are now only broadcasts 60 minutes long. The first half hour is always a DX programme in English (Italian Shortwave Panorama) followed by mailbag (or DX) show in Italian or non-stop music interspersed with announcements in English, Italian, German, Spanish and Catalan. We believe that with this reform
we are meeting the necessary requirements for contents that attracts short wave listeners who tune in with a special aim. It is our wish to continue to offer essential and interesting information about shortwave radio scene in shows which are up-to-date and informative. We hope that you, our listeners, will join us on this road. Please tell us what you like, or don’t like, about our programmes. 

SUMMER 2016 BRODCAST SCHEDULE (3 May 2016 – 29 October 2016) 
As from 3 May 2016 MRI will be on the air on Wednesdays, from 1800 to 1900 UTC, from 2000 to 2100 UTC, and from 2200 to 2300 UTC on 7690 kHz USB mode (alternative frequencies: 7700 and 7790 kHz) with a power in the region of 100 watts. Additional broadcasts may also be aired during week-end (but we can’t promise to do so ALL week-ends!) When this occurs a circular message with details about days, times and frequencies of these transmissions will be sent in advance to short-wave community and listeners in our mailing list. 

IMPORTANT EVENTS IN 2016
Marconi Radio International (MRI) celebrated its 30th anniversary on 4 January 2016. To mark this milestone, we carried over the air (on both 3 and 4 January 2016) a special programme in Italian, with details on the history of MRI and interviews with two well-known short wave personalities of Italy: Dario Monferini, editor of “Play DX” (the most famous and long lived short wave bulletin in Italy) and Roberto Scaglione, who produces and presents “Studio DX” the only radio show in Italian about media and DXing remained in life. They explained how, from their point of view, the short wave radio scene has changed during the last three decades. Also our playlist had something special as only songs with the word "Radio" in their title were played. (amomg them “On The Radio” by Donna Summer or “You Turn Me On I’m A Radio” by Joni Mitchell). But that is not all. In addition to our weekly DX programme in English "Italian Shortwave Panorama" and "Studio DX", we also carried over the air two vintage programmes of ours: a DX Show in English of 25th December 1991 as well as the edition nr. 6 of "Italian Wave", a show aired during 1986, which featured emerging Italian bands, signed to independent record companies, playing different kinds of rock music. A special 30th anniversary QSL verification was issued to acknowledge reports about reception of all MRI broadcasts aired in January 2016.
On 13 February 2016, Marconi Radio International celebrated the role of free shortwave radio on the occasion of World Radio Day. That's why we produced, in cooperation with other two free radios of Italy, Radio Europe and IBC – Italian Broadcasting Corporation, a special one hour show in Italian which included interviews with people behind the operation of these three free radios. Never before in its history MRI participated in a venture of this kind with other free radio stations of Italy. This day of celebration was also an opportunity to remember why we love free radio, to highlight the power of this medium to bring people together and to share this with shortwave enthusiasts.
A few days later, the idea of using airtime provided by another free radio began to take shape. On 29 February 2016 the idea came true as free broadcast airtime was provided by IBC – Italian Broadcasting Corporation to MRI. For the first time in our history our pre-recorded programmes were carried over the transmitter of another free radio. This special leap day transmission, which included “Italian Shortwave Panorama” (DX show) and “Microwaves” (A Rock show recorded approximetely 15 years ago) was on the air from 0800 to 1100 UTC on 6970 kHz with a power of about 700 watts. The same shows were also broadcast from our own transmitter site, from 0930 to 1300 UTC on 11390 kHz. It’s not a mystery that the founders of MRI were inspired by the successful story of the Italian Broadcasting Corporation (IBC), the first free radio in Italy to broadcast on short waves. Who would have dared imagine, 30 years ago, that a MRI broadcast would be carried by IBC?

NEW INTERVAL SIGNAL
As from 3 May 2016 MRI will be adopting a new Interval signal played on piano. It was originally written and played for Marconi Radio International by Enrico, the 12 year old son of our engineer and co-founder who built in 1985 our nearly “QRP” transmitter which has the capability of tuning only between 11 and 12 MHz. This new melody replaces our old Interval signal: the theme from the pop song “Georgy Porgy” by Toto with ID’s in English “This is Marconi Radio International” and Italian “Questa è Marconi Radio International”.
FROM OUR E-MAIL BOX Hi. I always tried your 11390 kHz but the signal was always too weak. This time I have tried 7790 kHz, weak only sometimes comes up, now 7690 is good. In the last minutes the transmitter drifted to 7690,15 kHz. It’s nearly 30 years ago that I heard Marconi for first time. Your QSL letter says 16.3.86 on 11650 kHz. At the moment I put more and more QSLs online on my website. http://www.repage.de/member/abo So it will be nice, when after 30 years, I get one of your QSL cards and not an E-mail QSL. A QSL card looks better on the website. Let’s hear what the tests so brings. Attached is an audio file and the old letter, is the guy still at the station??? I wish you all the best Happy Easter 73’s. (Andree Abo Bollin, Wolfsburg Germany). Yes Andree, the guy who signed yor QSL is still here! Ciao friends at MRI, I have been trying to hear Marconi Radio International on 11390 kHz for many months now, but was never successful, the propagation just didn’t seem to make it to this part of the United Kingdom on that band. When I saw that you were planning a number of tests on 7 MHz over this weekend I thought that I might have a better chance of hearing you, and I’m pleased to say that your 1700 UTC broadcast on 7690 kHz was audible all the way through here, even if not very strong. Hopefully the 2130 test will come through even better. I have attached a small mp3 file showing how it sounded here in the north western part of England (about 25km north Of the city of Manchester). I’m really glad to have heard you at long last, and now have MRI in my logbook. All I need Now is one of your famous QSLs and I will be very happy! The recording covers the last few minutes of the programme. I look forward to hearing you again, hopefully propagation will be even better next time. Good luck with the broadcasts. Ciao and best wishes. (Alan Gale, Rochdale, UK). Hello! Yesterday was a great day for me on short wave when listening to Marconi Radio International for the first time since your tests have started in January on 11390 kHz. But last evening it was fantastic when monitoring 7690 kHz usb and it worked. And as a consequence, I am very happy to submit the following reception report to your consideration. (Jacques Augustin, Rosny-Sous-Bois, France).
Hello, I tuned into your broadcast on 7690 USB today (16 APR 2016), as announced on the post at hfunderground.com, at 1249 UTC. I could only just barely hear anything at all, but I could discern that music was being transmitted there. Unfortunately it was too indistinct to really be able to hear. I might not have known for sure that I was getting a radio transmission if I wasn't specifically looking for one that I knew was there. The signal was largely free of noise and interference. Not bad for a 100 w transmission at a distance of at least 9,000 km. I am located in Denver, Colorado, USA, approximately 39.63, -105.02. I listened on a Grundig Satellit 750 receiver with a longwire antenna. Thanks for the announcement, and good luck with future transmissions! (Matt (MDK2) Keleher, Denver, Colorado, USA)

PROGRAMME DETAILS: YES, WE ARE A LITTLE BIT STRICT… At times we receive reception reports with programme details which are too vague and, therefore, we send the following message: “We regret to inform you that your reception report can't be verified with our QSL. The reason is that programme details you mentioned are too vague and, therefore, don't tell us that you have really heard Marconi Radio international”. As many of our listeners are aware we don’t send QSL as an act of courtesy but only after checking their reports with our station log and found they are 100% correct. Simply writing "talks and music or male voice” without mentioning the name of a singer, band or song is not enough to get a QSL from MRI. If reception conditions are very poor or you don't know the songs played or don't understand what is being said as you don’t speak the language used in our broadcast, all you have to do, to be sure to receive our QSL verification, is to to send an audio clip (mp3 file) of our transmission. Some listeners seem, however, to not understand the rules of the game, forget diplomacy and react aggressively. They feel offended when we remind them how to write a verifiable reception report. But what seems most surprising is the puerile justification of some of them: I don’t have a recorder!!! We can’t believe that a serious DXer or SWL has no way to record our transmission! And as that wasn’t enough there is someone who comments: The problem is the poor quality of your signal, not the vague description of what I heard! LOL This newsletter has been sent to you automatically, free of charge, because you are on our computer mailing list. It is not necessary for you to send in a request for each new edition. However, since we are constantly updating our mailing list, we would appreciate knowing if you no longer wish to receive this newsletter. Please e-mail us at: marconiradiointernational@gmail.com 
That’s all folks for this edition of MRI Newsletter Nr. 4 APRIL 2016!!! STAY TUNED!



E-QSL n° 114

Claudio Bianco (IK1XPK)

domenica 3 aprile 2016

DSP Noise Cancelling (by IW2NDH)

Il DSP Noise Cancelling presentato da Luca, che possiamo visionare nei filmati, è in pratica un clone del più famosi BHI. Per il momento è in fase di test da parte del collega IW2NDH, Luca che ne sta testando potenzialità e qualità.
In  linea di massima dovrebbe uscire, secondo le parole di Luca, non in kit ma già montato da lui in contenitore tipo hammond mod 1591XXATBU 100x51x22 mm, alimentato con presa mini USB; il segnale in ingresso sarà preso dalla presa cuffia e/o altoparlante esterno de ricevitore ed avrà un uscita non amplificata quindi sarà possibile applicare delle casse amplificate tipo quelle utilizzate sui PC o far seguire il circuito da amplificatore audio. Il DSP è strutturato in modo da essere immune alla radio frequenza ( testato con rtx da 200 W) e salvo correzioni future dovrebbe avere un costo decisamente abbordabile che si aggira sui 100 e o poco più.
Datasheet del codec

Per ulteriori info consiglio di contattare direttamente Luca su sul Forum di ARI Fidenza o tramite il suo sito dove troverete anche un interessante analizzatore di antenna/generatore di segnali.








Claudio Bianco (ik1xpk)


domenica 20 marzo 2016

New TECSUN PL-365


TECSUN PL-365 PLL DSP SSB

Il ricevitore PL-365 è l'ultimo nato della Tecsun ed appartiene alla gamma di radio multi banda portatili. La forma unica, le dimensioni, il peso ridotto, abbinati ad un prezzo accessibile fanno, del PL 365, un ottimo ricevitore nelle gamme MW/SW studiato intorno le esigenze di chi desidera un portatile da tasca il quale, con clips in dotazione, può essere facilmente portato alla cintura.
Il circuito RF del Tecsun PL-365 è stato aggiornato rispetto al fratello minore (PL-360) ed utilizza un chipset SiLabs Si 4735 a differenza del PL360 che utilizzava il Si 4734. La radio estende la sua copertura dalle onde medie 520-1710 kHz alle onde corte 1.711-30.000 kHz oltre alla possibilità di ricevere la gamma FM in stereo. È possibile anche coprire onde lunghe 150-520 kHz selezionando AM con il passo da 9 kHz.


Questo upgrate permette di ricevere la banda laterale unica (SSB) oltre ad aumentare la copertura del SW banda fino a 30 MHz. Nel PL-365 è stata migliora notevolmente la qualità audio dei segnali ricevuti utilizzando la tecnologia Digital Signal Processing (DSP) per elaborare il segnale ricevuto ed annullare il rumore di fondo e RF.
Il PL-365 dispone di 550 memorie suddivise in 4 banchi: 100 AM, FM 100, MW 100 e SW 250 per la sintonizzazione sulle stazioni preferite.
Anche il consumo delle batterie è stato migliorato ora, con tre batterie AA alcaline da 1,5 v, si può arrivare sino a 224 ore di lavoro del ricevitorie aumentando la possibilità di operate in portatile senza fonti esterne inoltre, il Tecsun PL-365, include anche la possibilità di ricarica interna per ricaricare batterie stilo AA Ni-MH, non fornite dalla casa, attraverso la porta di connessione mini USB (5 V) della radio posta sul lato destro della radio. La funzione selezionabile con l'apposito tasto.

Come il precedente modello, il PL-365 utilizza una antenna a stilo per la ricezione del FM e SW e una piccola antenna in ferrite interna per LWe MW. In dotazione c'è una antenna esterna che funziona da 150 a 1700 khz; da inserire nell'apposita presa posta sul pannello superiore. La medesima presa jack, che è utilizzabile anche per la gamma SW, permette anche l’utilizzo di antenne esterne come quali Tecsun AN-100 o AN-200. Il Tecsun PL365 è una radio ideale da utilizzare per AM / MW misurazione dei segnali EMI grazie alla possibilità di utilizzare una antenna AM esterna e alla possibilità di leggere sul display la potenza del segnale in dBuV.


Signal
strength
Relative
intensity
Received
voltage
Received power
(Zc = 50 Ω)
S1
–48 dB
0.20 μV
–14 dBμV
790 aW
–121 dBm
S2
–42 dB
0.40 μV
–8 dBμV
3.2 fW
–115 dBm
S3
–36 dB
0.79 μV
–2 dBμV
13 fW
–109 dBm
S4
–30 dB
1.6 μV
4 dBμV
50 fW
–103 dBm
S5
–24 dB
3.2 μV
10 dBμV
200 fW
–97 dBm
S6
–18 dB
6.3 μV
16 dBμV
790 fW
–91 dBm
S7
–12 dB
13 μV
22 dBμV
3.2 pW
–85 dBm
S8
–6 dB
25 μV
28 dBμV
13 pW
–79 dBm
S9
0 dB
50 μV
34 dBμV
50 pW
–73 dBm
S9+10
10 dB
160 μV
44 dBμV
500 pW
–63 dBm
S9+20
20 dB
500 μV
54 dBμV
5.0 nW
–53 dBm
S9+30
30 dB
1.6 mV
64 dBμV
50 nW
–43 dBm
S9+40
40 dB
5.0 mV
74 dBμV
500 nW
–33 dBm
S9+50
50 dB
16 mV
84 dBμV
5.0 μW
–23 dBm
S9+60
60 dB
50 mV
94 dBμV
50 μW
–13 dBm



Per collegare antenne esterne al Tecsun utilizzare l’ adattatore per antenna Tecsun da 3,5 mm a BNC (SKU P1423). Personalmente consiglio l’utilizzo di un riduttore costruito con cavo flessibile (come in foto) per evitare sollecitazioni meccaniche al jack della radio.



Il Tecsun PL365 utilizza ETM sistema easy di sintonia brevettato dalla Tecsun
Ecco alcune impressioni di una prima prova su strada, come dicono gli americani “dove la gomma incontra la strada”. La radio acquista dalla DAE Telecomunicazioni ha come numero di serie 3652015100428 e risulta prodotto il 10/2015.



Innanzitutto dobbiamo tenere sempre presente che le prestazioni di un oggetto come il PL-365 difficilmente sono paragonabili a ricevitori professionali in uso agli appassionati del settore quindi è fondamentale ricordare quel è l’obbiettivo del progetto per questa radio.

Ho effettuato le prime prove sulla gamma SW. Ho confrontato il PL-365 con alcuni portatili popolari il quale si è dimostrato competitivo, anche con apparati dal costo decisamente superiore. Cosa non insolita con i portatili di piccole dimensioni, il PL-365 aumenta le sue prestazioni tenendolo in mano; su alcuni segnali particolarmente deboli ho notato un aumento della prestazione tendo l’apparato in mano (anche in spazi chiusi) probabilmente per l’effetto capacità creato con il terreno. Come ovvio i segnali ricevibili aumentano, in intensità e quantità, con l’ausilio della antenna esterna; si hanno già ottimi risultati quella in dotazione fatta da pochi metri di filo connesso con una clip all'antenna a stilo.  La selettività si è dimostrata abbastanza buona e permette di separate la maggior parte dei segnali adiacenti.

L’innovazione del PL-365, cioè l’aggiunta di poter operare in SSB, permette di ascoltare le gamme amatoriali in banda laterale con un discreto successo inoltre il particolare design permette con una sola mano di sintonizzazione facilmente la SSB è possibile selezionare sia LSB e USB. Si accede alla funzione SSB dopo essere passati modalità SW. Premendo il pulsante USB/LSB dopo pochi secondi si vedrà una "U", che indica che si è in modalità banda laterale superiore (USB) oppure “L” se si opera in banda laterale inferiore. È interessante notare che il PL-365 ha due opzioni di larghezza di banda, un filtro più largo di circa 6 kHz e un filtro uni stretto 3 kHz (o meno), che si inseriscono automaticamente quando si entra in modalità a secondo della modalità AM o SSB.

In modalità  SSB la radio è impostata da fabbrica con uno step di 50 Hz ma è possibile variare la sintonia con passi da 20 o 10 Hz. Attenzione l’operazione va eseguita a radio spenta come precisa il manuale ed, una volta impostata rime anche spegnendo la Radio; si può, comunque tornare all'impostazione iniziale ripetendo l’operazione all'inverso in qualsiasi momento sempre a radio spenta.

Le prove in MW sono state più soddisfacenti del previsto; la sensibilità è ottima come  rumore di fondo su segnali più deboli il tutto, ovviamente sempre tenendo in considerazione del “giocattolo” che stiamo utilizzando. Ovvio che le prestazioni migliorano con un loop esterno. È comunque possibile ricevere forti segnali MW con l’antenna in ferrite in dotazione . All'accensione, se la radio è impostata con passi di 10 kHz, non riceve le onde lunghe (LW) per abilitare questa opzione, come per il settaggio dei passi (step) in SSB necessita operare a radio spenta operando come segue: premendo il pulsante DEL si scambia il passo in MW da 10 a 9 kHz abilitando automaticamente la ricezione a partire da 150 kHz.

La ricezione FM, nonostante non si abbiano controlli di tono e forse una larghezza di banda adeguata nel suo complesso è buona se confrontata ad altre radio dalle piccole dimensioni ma non mi sono soffermato molto in questo modo in quanto non credo si acquisti un oggetto simile per ascoltare le broadcasting in FM.

Una caratteristica che definirei interessante del PL-365 è la funzione di sintonia Fast/Slow che si attiva automaticamente. Faccio un sintonia ad esempio di come funziona;  iniziando la ricerca di una stazione, ad esempio in onde medie partendo da una frequenza tipo 900 kHz la sintonia in principio lavorerà in modalità Slow, aumentando di un solo kHz alla volta, ad esempio, passando da 900 kHz a 901, 902, 903, ecc.  raggiunti i 1000 kHz la sintonia passa in modalità Fast  incrementando di 10 kHz a passo, 1000, 101, 1020, ecc..; interrompendo la ricerca per un paio di secondi la sintonia tornerà a step di 1 kHz.
La tastiera, minimale, del PL-365 ha alcuni tasti che hanno una doppia funzione quindi leggere con attenzione il manuale in dotazione.

Conclusione: Il Tecsun PL-365 è, per le sue peculiarità, una radio diversa da quelle portatili che normalmente si usano. Il costruttore ha decisamente migliorato e aumentato le prestazioni rispetto al PL-360;  l’aspetto da walkie-talkie, l’aggiunta del SSB, , ma anche l’antenna in ferrite esterna unite a un prezzo accessibile fanno del Tecsun un ottimo giocattolo per chi ama l’ascolto. Utilizzando la radio in esterno durante una scampagnata con l'antenna filare in dotazione fissata ad un albero da un lato e all'antenna a stili completamente estratta del PL-365, suppongo anche per effetto capacità da me creata con il corpo ne è venuta fuori una sorta di antenna a "L" che acquista una certa direzionalità spostandosi in modo tale l'antenna risulti posizionata nella direzione del segnale aumentando, a volte anche di parecchio, il segnale ricevuto.


Molto interessante l'antenna in ferrite recensita sul blog SWling:

acquistabile su ebay

DATI TECNICI PL-365

FM 76 – 108 MHz, 87-108 MHz, 87.5-108 MHz (Selectable)
LW 150-519 KHz
MW 520 – 1710 KHz
SW 1711 – 29,999 KHz in 14 Bands (120M, 90, 75, 60, 49, 41, 31, 25, 22, 19, 16, 15, 13, 11)
SSB SW Bands: (160M, 80, 40, 30, 24, 20, 17, 15, 12, 10)

FM (S/N=30dB)     3μV 
MW (S/N=26dB)   1mV/m 
LW (S/N=26dB)    10mV/m 
SW (S/N=26dB)         30μV
SSB (S/N=10dB)   3μV (3 Khz Selectivity)

FM Tuning Steps 0.1 MHz (Fast), 0.01 MHz (Slow)
MWTuning Steps 9/10 KHz selectable or 1KHz Slow Mode
LW 9/1 KHz Tuning Steps
SW Tuning Steps 5/1 KHz
SSB Fine Tuning Steps 50Hz, 20 Hz, 10 Hz

Selectivity
SSB 2,3 kHz 
AM 6 kHz 
SW 3,4 kHz 

S/N Ratio 
FM >60 dB 
MW>60 dB 
LW >60 dB 
SW >60 dB

Dimensioni: 2 x 6 x 3/4″ 4.4 oz

Peso: 128 g without batteries

PL-365 è anche commercializzato con il nome di  CountyComm GP-5/SSB 


Manuale On-line 




Claudio Bianco IK1XPK