Tag Archives: Brazil

Guest Post: Martin Butera visits Radio Guarujá in Sao Paulo, Brazil

Many thanks to SWLing Post contributor Martin Butera for the following guest post:

Photo: Martin Butera at the entrance of Guaruja Radio AM 1,550 kHz. The house, where Radio Guaruja is located in the Pitangueiras area, Santa Rosa neighborhood, in Guaruja, Sao Paulo, Brazil. It is easily recognised by the huge self-supporting medium wave antenna mast.

Radio Guarujá Paulista AM/FM and Ex tropical waves

AM: 1.550 KHZ/FM: 104,5 (ex-101,7) MHZ
ex Ondas Tropicales: 3,385 kHz – 90 Mts, 5,940 kHz – 49 Mts.
Guarujá, São Paulo – Brazil

Report and research by: Martín Butera

Photographs and Video (under study) by: Ligia Katze

Sudipta Ghose (VU2UT) for adaptation to English and corrections.

Guarujá is a municipality in the state Brazilian of San Pablo, located at a latitude of 23º 59 ’18 “South and longitude of 46º 14′ 32” West.

“Guarujá” is a term of Tupi origin that for some people means “bird master” or “bird chief”.

Table of contents

1. Introduction and brief history of Radio Guaruja

2. Interview with Orivaldo Rampazo (Director of Station Hisory)

3. Interview with Erminio Matos (coordinator of journalism and coordination of the broadcaster in general).

4. In the Short Waves of Guaruja Paulista

5. Study and Technical Control

6. Recording Studio

7. Field of Antennas

8. Final conclusions

9. Acknowledgments

10. Author’s review.

1. Brief Introduction to the History of Radio Guaruja

ZYK 590 (AM)

Radio Guarujá Paulista began broadcasting in the city, according to the data provided by ANATEL (Agência Nacional de Telecomunicações – Brazil), between the mid and late 1940s.
Currently the studios and transmitter plant is located in the area of Pitangueiras, a Santa Rosa neighborhood, duly assigned and domiciled in the street, José Vaz Porto, number 175.

The AM service, which operates at 1,550 kHz, covers several frequencies: medium waves, short waves and tropical waves. In shortwave, it operate at 5045 kHz and 3385 kHz.
It was the only radio station of “Baixada Santista” that does broadcast in short waves. The programming on these frequencies are the same as in the medium wave (AM).

Guarujá Radio during all these years witnessed historical moments of the city (political, social, sports) and has beyond the commercial aspect, an invaluable value for the population.

Radio Guarujá AM reached the pinnacle of the audience support. The numbers are impressive. Approximately 40% of the inhabitants of “Baixada Santista” tuned their radios on to Radio Guarujá AM.

FM ZYD 815 (FM)

Guarujá Paulista Radio also has commercial facilities in the neighbouring city of Santos, Sao Paulo, where it operates a station on frequency modulation mode (FM). The FM operations began on the 101.7 MHz, in the mid-1970s, with studios located in Praça da República, in the Santos Center.

At the end of 1987, there was an agreement between a group of businessmen from an Osasco station in Sao Paulo, called Alpha FM, which operated on the frequency of 104.5 MHz. Radio Guarujá, which transmitted on 101.7 MHz, reached an agreement and exchanged between  the frequencies, that way both could significantly increase their coverage area.

With the change in frequency Radio Guarujá FM, came close to the position of the other radio stations on the radio dial which the listeners tuned in regularly: Tribune (105.5 MHz) and Culture (106.7 MHz). In turn, the Osasco station (Alpha FM), would be closer, on the dial vis-à-vis the traditional stations of São Paulo, such as Jovem Pan (100.9) and Transamérica (100.1). The two radios signed into such agreement.

This change in frequency had the much desired effect, because after such an arduous task of consolidating the new position on the radio dial, Radio Guarujá FM has, since 1996, considered as the benchmark of IBOPE (Brazilian Institute of Public and Statistical Opinion), the first place in audience in all Santos.

The “other” Guarujá AM

There is another Guarujá radio station in Florianopolis, a city in southern Brazil, in the state of Santa Catarina, established in 1942 and broadcasts its programme on a frequency of 1420 kHz.

The choice of the name was a curious case, at that time as the inhabitants of the city could only tune in to two radio stations. They were: National Radio of Rio de Janeiro and Radio Atlantica, from the city of Santos.

On Radio Atlantica, complimentary messages to the beaches of Guarujá were common, as were comments on the elegance and opulence of their regular listeners. Thus, in Florianopolis, at that time, Guarujá became synonymous with elegant and luxurious things.

The name became fashionable and that way the station, was baptised with the name of “Guarujá”.

2. Interview with Orivaldo Rampazo

After several phone calls, e-mails and follow-ups, I finally managed to schedule a meeting with Orivaldo Rampazo.

It was an interview of only a few minutes, but of great importance. It was not difficult for me to read his mind in that short time to find that Don Orivaldo is truly passionate about radio.

In 1969, Orivaldo Rampazo was invited to take over the management of Radio Guarujá and 5 years later he would become the owner of the station.

Orivaldo Rampazo is a person of great historical importance not only for the Radio Guarujá, but also for the city of Guarujá.

He participated very actively in politics, trying to improve and solve the problems of the inhabitants of the city of Guaruja and he did so without taking up positions.

Photo: Martin Butera at the office of Orivaldo Rampazo.

MB: How did you start in radio?

OR: You see, I started working from a very young age, I worked in a furniture store as a polisher and one day by chance, they sent me to polish some furniture in a radio a station called Clube de Tupa AM 1320 radio.

They started giving me a sort of voice test which I was answering, until someone said, that I had a wonderful voice for radio.

Then I asked what I needed to be an announcer and they told me that I had to know how to read the newspapers very well and exercise my voice and that is how I prepared for the tests and started working as an announcer, going through several stations in Sao Paulo, as an announcer in different areas like information, sports, commercial etc.

At the end of the 60s I proposed to take up the post of manager of Guaruja radio and 5 years later I became its director and here I am since then.

MB: What do you like most: AM, FM or Shortwave broadcasting?

OR: Without a doubt, for me the best of radio is in modulated amplitude, in fact I hardly go to the FM radio as it is in the neighboring city.

MB: However, you are often considered as a supporter for FM?

OR: It was like that in FM, we were the pioneers, the first FM of the “Baixada Santista” was ours, we began to broadcast in 1974, with a small transmitter of 80 W and a single dipole. I dare to even say that we were one of the first FM stations in Sao Paulo.

MB: And how did your relationship with shortwave come into being?

OR: I always love shortwave. I lived in Sao Paolo and as a kid the only way to remain informed was by listening to shortwave radios, both Brazilian and international.

MB: Do you remember what radios you were listening to then?

OR: Of course, I listened a lot to the BBC in London, The Voice of America. I remember when I grew up and was working as a journalist, I learnt about the death of John Fitzgerald Kennedy on shortwave radio and took the lead in Lins Rádio Clube, an AM station, from the interior of Sao Paulo about 400 kilometers away from the capital.

Of the Brazilian radios, I liked to listen to the radio station Rádio Brasil Central of the city of Goiânia, the capital of the state of Goiás.

MB: Were you also a DXer?

OR: If you really liked the QSL confirmations, I have some very interesting ones. I also participated in several DXcamps of the DX Clube do Brasil. Some of them were very important as one of the Cumprida Island of 2003 (São Paulo, Brazil).

MB: And what was it like having your own shortwave station?

OR: In 2003, I acquired the tropical wave license of the Rádio Clube de Marília, a city in the interior of Sao Paulo, and another city in the interior of Sao Paulo, the Rádio Diffusora of Presidente Prudente, it was a dream come true.

They remained on air for about 5 to 6 years, until for economic reasons and for a little pressure from my home, my family did not think the shortwave operations as something profitable.

I tried to explain to them that one may not have a massive or profitable audience, but those of us who love radio with a capital letter know what the shortwave means.

The short wave is still an exceptionally good radio tool.

MB: Is your radio a family legacy?

OR: I would explain it with a simple word, Guaruja radio is love, the family legacy, five children of mine, the son-in-law and even the grandchildren continue in that.

As this interview ended, I got that word “love”, Orivaldo Rampazo, a radio man who knew how to build his own dream. Radio Guaruja AM 1,550 kHz, a family legacy, that seems to have no end.

2. Interview with Erminio Matos

With a forward-thinking, direct strategy, it’s amazing what Erminio Matos, son-in-law of Orivaldo Rampazzo, achieved in recent years.

The increase in the number of audience and a quantum leap in radio advertising for Guaruja AM 1,550 kHz. Easy task, given to the larger audiences, of the current medium-wave stations.

Erminio Matos, takes care of journalism and coordinates with Simona (daughter of Rampazo Orivaldo), at the current address of Radio Guaruja AM 1,550 Khz.

Restless, and having worked in other stations of Guaruja, at the end of the 90s he joined an important station of the great capital Sao Paulo, together with great personalities of the radio of Brazil like: Paulo Lopes, Kaká Siqueira and Eli Corrêa among others.

Since 2009 he is again with Guaruja Radio.

Photo: Erminio Matos, Coordinator of journalism and coordination of the broadcaster in general.

MB: What did it take to work with such important radio figures in Sao Paulo, capital?

EM: For someone from the interior of the country it is always a dream to arrive in Sao Paulo. Without a doubt those people managed to change my mind and thought process as a radio professional. Being always very frank I could understand that I needed to move or change some things.

MB: What things did you change?

EM: For example, here in the downward trend the pace is slower. I had to change my way of thinking and communicating, in Sao Paulo where there are about 12 million people. It is like a country within another country. To be able to perform here one must shoulder greater responsibility. You have to be agile and fast.

MB: Do you now impose that work culture on Radio Guaruja?

EM: Undoubtedly, all that I learned with these radio figures added a lot of value to me. Anyway I don’t allow myself to live in a world of fantasies, now I am aware about the small but great work I do here.

MB: How do you increase the audience?

EM: I have the understanding that the world changes fast. The modern world is trapped in social networks. Today people do not only have radio as “the great means of communication”.

Then using these modern resources with the radio, we set up a television-type computer program and we go out in video format through all the platforms and social networks. The path of radio is that of modernisation, the public is craving for that.

It seems simple and silly, but please think that Guaruja radio is a classic AM station of the “baixada santista”, with 70 years of history. It is not easy to change course.

MB: What did you do to increase advertising?

EM: Although the Internet connects everyone and makes it easier for any business to start their own advertising, people are still giving importance to the brand behind. In this case Radio Guaruja, Is getting duly recognised.

Anyway, it was not an easy task, I had to make the whole radio understand that the listener profile does not exist anymore, here we work for potential consumers, that look had to be transformed and end with the romanticism of the “listener”.

MB: Has programming also changed a lot?

EM: If now the radio is less music and more content, what is the use of making music programming today if the music is on Spotify.

Modernisation does not mean to kill the radio. On the contrary it gave push to the possibility that Orivaldo’s dream will continue to flourish for many more years.

When we understood that the radio must go to a fresh direction, we began to strongly invest in more modern equipment and to hire young people, from whom we can learn the new radio language.

MB: You have almost 40 years of experience in the field, then why change from the original formula that always worked?

EM: it is true I started very early; I am from an artistic era of radio. The movement started with vigour in the decade of the 90s. I did not mind leaving the cassette, to go to the CD and now we are on the mp3 and streaming transmissions.

That is why it was inevitable to change the working formula.

MB: What do you think about technological changes as you see the move of the AM to digital mode?

EM: That move should have been there years ago, without a doubt it will broaden the spectrum of radio consumers even more, but well, unfortunately Brazil is politically late, the migration of AM to digital mode is also late.

MB: Does Guaruja radio listen to other radio stations?

EM: I listen to other things all the time. I am now listening to a radio that has a very creative concept, it is called Wish Radio. It is a station in Philippines!

They broadcast in the format of a reality show and go out in the neighborhoods on a mobile phone and look for talents. The idea seems to me just fabulous.

MB: How do you see the Radio Guaruja AM 1,550 kHz in future?

EM: Radio is content, today everyone discusses everything and radio doesn’t have to be out of that discussion, radio has to prepare for that.

That’s why here in Guaruja radio we are already preparing for that to happen, working with young people, we have a lot to learn from them.

Photo: Martin Butera and Erminio Matos, in the office of Radio Guaruja AM 1,550 kHz

Erminio Matos, knew how to interpret the changes in the listeners’ taste vis-à-vis the rate at which the society changes.

The Radio Guaruja AM 1,550 Khz, has a lot in future with the Directors, who understand that sky is the limit !.

4. In the Shortwaves of Guaruja Paulista

In 2003, Radio Guarujá AM acquired the tropical band allocations of Rádio Clube de Marília and Rádio Diffuser of Presidente Prudente. The station signed an agreement with DX Clube do Brasil, which produced the Guarujá Paulista shortwave programs between 2004 and 2007.

The presentation was made by DXCB colleagues Sarmento Campos, Célio Romais, Renato Uliana and Adalberto Azevedo (already deceased), with the participation of the DX Clube do Brasil team. In 2007, Radio Guarujá Paulista joined, for a short period, the Radio Globo System and the program ceased to exist.

5. Studio and Technical Control

The radio station has studio and technical control together in the classic American way, although the announcer is assisted by a technical operator. Without naming brands, we can visualise the following setup:


The studio is vast so that you can work comfortably. It has a specially designed table, equipped with five condenser microphones and very good ergonomically designed chairs, to work comfortably in a relaxed manner, maintaining good body posture.

The walls and door of the studio are totally isolated from outside noise, with acoustic panels.

Control room

The control room is professional-grade, with all the necessary components to carry out programs.  They have: computers with radio automation software, sound console, several audio processors, monitors, televisions with different information channels.

Video: View of the technical control

Photo: Shift operator and Martin Butera – Radio Guaruja AM 1,550 kHz

Photo: Martin Butera, next to the audio rack of Radio Guaruja 1,550 kHz.

Photo: Rack of processors of Radio Guaruja AM 1,550 kHz

Photo: Martin Butera, sitting in the main studio of Radio Guaruja AM 1550 kHz.

6. Recording Studio

Radio Guaruja, has a recording studio that’s ideal for recording, editing and mixing different news, advertising and interviews without the need to occupy the main studio.

Here are details of the equipment that make up the recording studio, without naming brands: a good computer, an excellent DAW (digital audio workstation), program used to record and edit, a very good audio interface, mixing console, two high quality studio microphones, headphones, studio monitors.

Photo: Gateway to the recording studio of Radio Guaruja AM 1,550 kHz.

Photo: Microphones, mixing console and other equipments of the recording studio of Radio Guaruja AM 1,550 kHz.

Photo: Recording engineer on duty working in the recording studio of Radio Guaruja AM 1,550 kHz.

7. Antenna Field

The AM transmitting plant is on the same site, behind the radio studios.

The antenna is a classic folded monopole over 60 meters high which allows the station to have very good coverage.

On the day of the visit we could not enter the transmitter room.

Photo: Antenna, folded monopole over 60 meters high.

Photo: Radiation alert poster.

Photo: Home alarm (rooster)

Photo: Martin Butera, standing next to the Guaruja AM 1,550 kHz Radio antenna.

Here we can see a brief video of the antenna field:


8. Conclusion

I cannot finish this report without congratulating the Rampazzo family. The Guarujá AM 1,550 kHz radio studios are as modern as the major radio stations in São Paulo and even international stations.

Many say that AM radio is becoming extinct, and that is true, perhaps because AM stations haven’t adapted to modern times.

Erminio Matos, knows how to keep Radio Guarujá evolving, bringing news to the air, and insuring this family’s radio legacy will have an excellent future!

9. Thanks 

To the whole Rampazo Family.

Tourism, Municipal Prefeitura de Guarujá – Sao Paulo – Brazil.

To my wife, Ligia Katze (for the photographs).

To my dear friend Mark Van Marx (Marcos Melzi), in photo editing.

Thanks to the friend and shortwave listener and radio amateur from India, Sudipta Ghose (VU2UT) for his adaptation to English and correction. He is a member of the Indian DX club International http://idxcidxpedition.blogspot.com

To my friend Ivan Dias da Silva Junior, Director of the Regional DX – Sorocaba-Sao Paulo- Brazil, who collaborates in Portuguese translations and publishes this material in the form of a micro book, for the club and directs  https: //ivandias.wordpress.com

To the Colleagues of the DX Club of Brazil (DXCB), Sarmento Campos and Célio Romais https://www.ondascurtas.com/

Finally, my friend Thomas Witherspoon, Director of the SWLing Post, for publishing this exclusive report and collaborating in this way for the world of radio.

Photo: Martin Butera with Orivaldo Rampazo

Photo: Emir Matos and Martin Butera at Radio Guaruja AM 1,550 kHz

Photo: Ligia Katze (wife of Martin Butera), at the Guaruja AM 1,550 kHz radio studios.

10. Author’s review

Martín Butera is a shortwave radio listener and has been an amateur radio operator since 1992. Martin  has participated in DXpeditions throughout South America, with the Argentine radio callsign LU9EFO and the Brazilian callsign PT2ZDX.

Martin is a correspondent journalist from South America for the British DX Club’s magazine, Communication. If you would like to be a member of the Briitish DX Club, you can find information here http://bdxc.org.uk/apply.html

Martin is the founder of CREW called 15 point 61 (15.61), são paulo – Brazil.

Martín Butera is a journalist, documentary filmmaker and founding member of Radio Atomika 106.1 MHz (Buenos Aires, Argentina) www.radioatomika.com.ar

He currently lives in Brasilia, capital of Brazil.

Do you enjoy the SWLing Post?

Please consider supporting us via Patreon or our Coffee Fund!

Your support makes articles like this one possible. Thank you!

Spread the radio love

Guest Post: Photo tour and history of the PPE Observatório Nacional time signal station

Many thanks to the SWLing Post contributor, Martin Butera, who shares the following guest post:


Visiting the most important time signal station in South America – PPE Observatório Nacional

by Martin Butera

Still photographs by: Mark Van Marx (Marcos Melzi)

Video by: Ligia Katze

English adaptation and correction by: Sudipto Ghose (VU2UT)

We invite you to a tour of the service division of the official time signal station of the National Observatory of Rio de Janeiro, Brazil PPE BRA OBSERVATORIO NACIONAL

Let us take you to a place for which all the readers should enjoy: the famous 10 MHz short wave transmitter of the Hour Service Division (DSHO), of the national observatory of Rio de Janeiro, Brazil.

We were invited by the engineer Mr. Ozenildo de Farias Dantas, in charge of the maintenance and flawless operation of the transmitter, to take a look at the famous transmitter.

The Hour Service Division (DSHO) broadcasts Brazil’s Official shortwave time signal on the frequency of 10 MHz.

The transmitter is located in the park, outside the main building, in a small, climate-controlled house specially designed to accommodat it.

Here are some of the transmitter’s technical notes:

Manufacturer: Redifon Telecommunications Limited, London SW.18, England
Power: 1 kW
QRG: 10 MHz
Type of modulation: A3H
Type of antenna: horizontal dipole – ½ wavelength

Here are the geocentric coordinates of the site( WGS84):

X = 4283641.45 m Length = 43 13 27.5 W
Y = – 4026026.11 m Latitude = 22 53 44.6 S
Z = – 2466098.27 m Height = 37 m

The content of the transmission: the transmission consists of the official time of Brazil (= UTC – 3 hours) announced by a female voice that begins in Portuguese with the following phrase “National Observatory” followed by the current time (hh: mm: ss) every 10 s and with a short beep every second with a modulation of 1 kHz for 5 ms and a long beep with a modulation of 1 kHz for 200 ms at 58 °, 59 ° and 60 ° seconds. [Audio sample below.]

The Hour Service Division (DSHO) also broadcasts Brazil’s official time with 2 local VHF broadcasts for the city of Rio de Janeiro on the 166.53 MHz and 171.13 MHz frequencies.
The transmission of the time signal of 10 MHz by the DSHO began in November 2008, over all these years, this signal was already picked up by radio listeners in different parts of the world, and the reports are confirmed by QSLs. Dr. Ricardo Carvalho head of that division,

Dr. Ricardo Carvalho kindly gave me one such QSL.


Engineer Ozenildo de Farias Dantas and our journalist Martin Butera, entering the house of the shortwave transmitter.
Shortwave transmitter, Redifon Telecommunications Limited, used in the Service of the official Time of the National Observatory of Rio de Janeiro. There is a ubiquitous BIRD Wattmeter on top left of the transmitter.

From another angle, the short wave transmitter, Redifon Telecommunications Limited, used in the Service of the official Time of the National Observatory of Rio de Janeiro.
Engineer Ozenildo de Farias Dantas dismantles a part of the transmitter panel, to begin with his routine of calibration and maintenance of the transmitter.
The engineer Ozenildo de Farias Dantas and our journalist Martin Butera, along with the transmitter Redifon Telecommunications Limited.

The Antenna

It is a simple but robust dipole, perfectly cut and calibrated by engineer Ozenildo de Farias Dantas for the frequency of 10 MHz, which has given excellent results to this day.

One of the sections of the dipole is supported by the historic imperial tower of the observatory. This tower is famous because many years ago a balloon was inflated at the precise moment that it was 12 noon and was launched so that this was observed in the port of Rio de Janeiro that was called the famous “half astronomical day”.

Dipole wire antenna of the National Observatory
we can see a section of the dipole, supported by the old Observatory tower
Mr. Ricardo José Carvalho (head of the division), with a history book of the National Observatory of Rio de Janeiro, where he mentions about the first tower of the observatory. Behind we can see that the tower still remains intact. Old tower of the National Observatory
Here we can see that they have a tower with different antennas to receive different world time signals
Here we can see the antennas of the VHF transmitters

Listening to the time signal frequency stations is an interesting aspect of the DXing. Many may not know that these stations are in operation in different parts of the world, and have been since the early days of the radio to the present twenties.

The purpose of these stations is to cover various branches of science, such as seismology, meteorology, astronomy, geodesy, etc.

Between the different stations a constant effort is made to coordinate their time internationally so that in the future they can all maintain and supply a world time standard without the slightest difference.

Brazil has the most important time station on the South American continent, I am very happy to present this exclusive report for SWLing Post for all of you.

This was the first time a group of DXers has be welcomed by the Service Division of the Hour (DSHO), from the National Observatory of Rio de Janeiro.

I was especially welcomed by Mr. Ricardo Carvalho, Head of the division, who kindly guided us on an extensive tour, showing all the facilities. I was also able to film a pleasant interview (in Portuguese).

Click here to view on YouTube.

Surely all of you who are now reading this report know that listening to the short wave, can become the most instructive hobby that exists.

To know about a country, its customs, its culture, its gastronomy, its geography, to follow the national or international current affairs, are the interests that define the various aspects of the hobby of radio listening.

The main purpose of listening to international short wave radio stations is to know the world better, to open up to other cultures, to other ideologies, to demystify the unknown, to have access to the many facets that make up the world.

In short, the listening to international short wave radio stations of the whole world is traveling around the globe without leaving home or even getting up from the couch.

Station History

Current entrance of the National Observatory, museum of astronomy and related sciences of Rio de Janeiro.

National Observatory of Rio de Janeriro 1827 – 2019

Now, I shall try to summarize 192 years of history, a mission that is not at all simple.
To remain as a scientific institution of recognized competence for 192 years is an almost impossible mission in Latin America.

The National Observatory (ON), established in Rio de Janeiro, is an example of determination since its foundation on October 15, 1827 by Emperor Dom Pedro I.

Since then, much has changed at the National Observatory, where the creation of the Brazilian Official Time Division with its acronym (DSHO), established by law in 1913, stands out. Nowadays, the service is generated from a set of twelve atomic clocks that also contribute to the official world time scale.

The need for an Astronomical Observatory in Brazil began in the colonial period, its creation was necessary due to the increase in commercial activities and the rapid growth of ships arriving and departing from the ports of Rio de Janeiro since the beginning of the 19th century, and this demand became more evident.

For the sake of safer sea travel, it was essential to obtain accurate knowledge of the magnetic declination, the average time and information about the length so that commanders could regulate the timers.

That is why the installation of an observatory in a fixed location could offer ships more accurate information than those obtained at sea.

The first records date from the inception to establish an observatory in the Hill of the Castle in 1730 on the initiative of the Jesuits, in the same place was established in 1780 an observatory of Portuguese astronomers where they made the first observations of astronomy and meteorology.

Hill of the Castle in 1730 (File ON)

But only in October 1827, by decree of D. Pedro I (first emperor of Brazil), the headquarters of the Imperial Observatory of Rio de Janeiro was established, this was the first institution of this genre built in Brazil.

Initially, this astronomical observatory was established in the tower of the Military School, in charge of Pedro de Alcántara Bellegarde (military, educator, astronomer and Brazilian engineer), who played a fundamental role in the area of important scientific institutions throughout the 19th century.

However, until at least the 1870s, the activities of the institution were almost exclusively related to the instruction of military school students.

Only in 1871 were its functions redefined, when it came out of the military administration, the Observatory could dedicate itself mainly to research and service activities in meteorology, astronomy, geophysics, measurement of time.

Such redefining of its sphere of activity was driven by the Administrative Commission of the Imperial Observatory, which in this period began the process to choose the new site, in a place that is considered more appropriate, where it would be transferred later.

The conclusion of several studies culminated with his transfer to the hill of “San Januário”, at the beginning of the 20th century, where it still operates today.

Panoramic view of the domes of the meridian lunettes used for the determination of time. (File ON)
Building of the National Observatory built at the beginning of the 20th century, when it was moved to Morro de São Januário. (File ON)

These fundamental changes, that took place after 1871, happened during the administration of Emmanuel Liais (he was a politician, botanist, astronomer and French explorer who stayed in Brazil for many years), who was responsible for the process of remodeling the observatory, during the two terms for which he was the director (from January to July of 1871 and again between 1874 and 1881).

The increase in the activities of the Imperial Observatory led to the publication of the first volume of the Observatory Yearbook in 1885, which gave continuity to the Astronomical Ephemerides, published between 1853 and 1870.

The aim of the Yearbook was to disseminate information obtained from astronomical and meteorological observations, constituting until today an important bibliographical reference on the annual scientific production of the institution.

In 1886, the Observatory Magazine, the country’s first scientific journal, was published in 1886 with the aim of disseminating scientific productions, which lasted for only a short time and were stopped in 1891.

With the new political winds blowing from 1889, triggered by the proclamation of the Republic, also changed the orientation of the institution, subordinating itself to the Ministry of War and receiving the name of Observatory of Rio de Janeiro.

Only in 1909 it was renamed as OBSERVATORIO NACIONAL (ON): the Ministry of Agriculture and the Directorate of Meteorology and Astronomy was created, and the Observatory was made subordinate to this.

From then on, the institution began to provide the weather forecasts for different purposes. During that time, the activities of meteorology and astronomy walked together and the calculation of time was made by astronomical methods. These two functions, however, were separated in 1917, when the National Observatory only covered studies on astronomy, geophysics, and time and frequency. With this redefinition of functions, the scientific trajectory adopted by the institution throughout the 20th century was marked.

The beginning of the 20th century also gave rise to ideas that would lead to scientific moods. The accelerated process of urban reforms and the redefinition of the state function as a promoter of national scientific activity represented a new apparatus for the diffusion of sciences, accompanied by the notions of civilisation, modernity, reason and progress that drove all actions in the scientific field.

The institutional framework of the National Observatory, in relation to these intense transformations in the Brazilian social, political and scientific plan of the beginning of the century, was evidenced in the management of Henrique Morize (considered the great introducer of experimental physics in Brazil), having assumed the post of the Director of the Observatory in 1908, was responsible for several important modifications of the institution during this period, in which Rio de Janeiro also underwent intense urban reforms.

During the twentieth century, several reforms in the political-administrative spheres changed the jurisdiction of administration to which the institution was linked; however, they changed their attributions. In this sense, In 1930, the Observatory was brought under jurisdiction of the newly created Ministry of Education and Culture; in 1976, it was transferred to the control of the National Council for Scientific and Technological Development (CNPq). In 1999, such transfer of jurisdiction took place to the Ministry of Science and Technology which is maintained till today.

Einstein’s theory of relativity

The National Observatory of Rio de Janeiro, has always been present on the world stage with many scientific contributions which were internationally recognized.

Perhaps one of the most “famous” such contribution was in the year 1919, when the National Observatory coordinated the English expedition that observed the total eclipse of the Sun, in the Brazilian city of Sobral, in the state of Ceará.

The phenomenon was also observed parallelly in the Prince Island. Such observation contributed to the confirmation of Einstein’s theory of relativity, when the deviation suffered by the light of the stars in the background of the sky caused by the gravitational field was verified due to the mass of the Sun.

Visit of Albert Einstein to the National Observatory in 1925, after having tested his Theory of Relativity thanks to the work of the National Observatory of Rio de Janeiro. (File ON)

Importance of creating a specific division of time in Brazil

To understand the importance of creating a specific division of time (DSHO), within the National Observatory of Rio de Janeiro, we list below the very relevant fact about Brazil.

Brazil has a territory of continental dimensions with an area of 8,547,403 square kilometers.
The extension of the territory, we can analyse it in the following way from north to south and from east to west, in the first case, from Monte Caburaí (Roraima) to Arroio Chuí (Rio Grande do Sul) 4,395 kilometers are recorded, in the Serra da Contamana (Acre) to Ponta do Seixas (Paraíba) results in 4,320 kilometers. As you can see in the following graphic

It is the largest country in Latin America and the fifth largest in the world. If we put all the countries of Europe ( except the Russian – European part) and there would still be space left over in Brazil.

I took the trouble to scan an old Brazilian geography book since I found the following image and it seemed very interesting, this image leads to a good reflection on the dimension of Brazil.

In case it is not clear to the valued readers, the size of Brazil and its continental dimensions, the whole United Kingdom alone, fits within the state of São Paulo.

That is why, because of the enormous size of Brazil, it has landmass in three different hemispheres at the same time: the majority in the southern hemisphere, a small part in the northern hemisphere and all its territory in the western hemisphere.

In the North It is cut by the Line of Equator and in the South by the Tropic of Capricorn, thus getting 92% of its area in the tropical zone.

Another aspect of the geographical position of Brazil is its latitudes and longitudes, that is, its geographic coordinates, which are generally measured from the equator (latitudes) and from the Greenwich meridian (longitudes). Thus, in latitudinal terms, the Brazilian territory extends from something close to 5º North to approximately 33º South. In longitudinal terms, the extension extends from 35º West to a little less than 75º West. But if we ignore some of the oceanic islands in the Atlantic, they are placed in somewhat smaller lengths.

Due to its great east-west extension, Brazil presents a great variation of time zones, totaling four different regions that we can observe in the following map.

The first time zone is two hours behind the Greenwich Meridian (-2GMT, therefore) and covers only the islands in the Atlantic Ocean, (Yellow color on the map).

The second and most important portion (-3GMT) covers most of the Brazilian states, including the Federal District and the capital, Brasilia, making it the official time of the country, (orange).

The third area (-4GMT) covers some states to the west, namely: Mato Grosso, Mato Grosso do Sul, Rondônia, Roraima and most of the Amazon, (green).

The fourth and last time zone (-5GMT) covers a small western part of the Amazon and the state of Acre, (pink).

And if you still do not understand the complexity of the Brazilian time system, we can mention this curious fact: the first day of the year never reaches all the people of the world at the same time. In Brazil it is not different, because Brazilians can celebrate the New Year four times! This is due to the four time zones that we mentioned earlier.

Brief summary of the History of the Official Time Service Division (DSHO)

The beginning of the activities of the National Observatory precedes its creation date in 1827. Since 1730, regular observations of astronomy, meteorology and terrestrial magnetism have already been carried out in Morro del Castillo, in the city of Rio de Janeiro.

With the arrival of the royal family to Brazil in 1808, the heritage with the research of the time was transferred to the Royal Military Academy. Nineteen years later, Pedro I determined the creation of the entity that would inherit his patrimony.

Since then, National Observatory has accumulated a precious history that covers the areas of Astronomy, Geophysics and Metrology in Time and Frequency.

The time and frequency metrology is the responsibility of the Services Division of the Official Time, which for more than a century and a half has been legally responsible for generating, maintaining and disseminating the Official Time of Brazil and also plays the role of Time Laboratory and Primary Frequency, denominated in its initials as (LPTF).

The Official Time Service Division inaugurated its new facilities in 2004.

The modern building is named after Carlos Lacombe, in honor of the engineer who directed that division in the period from 1963 to 1977 and participated, along with Henrique Morize and Roquete Pinto, in the creation of the first radio station in Brazil, called (Rádio Sociedade do Rio de Janeiro).

Enter the building of the official Brazilian time, it is simply fascinating, it is very large and has the most modern technologies.

To understand better how it is inside, I decided arrange the tour in the following order: Museum, Generation room, Conservation and Dissemination of time, Laboratory and we will leave the Short Wave Transmitter for the last.

Come with me !!

Martin Butera at the entrance of the modern building of the Official Time Service of the National Observatory of Rio de Janeiro.

Small Museum

When entering the modern building of the Service of the hour (DSHO), of the national observatory, the first thing we can observe is a small but very interesting museum of the first clocks and measuring instruments, kindly Mr. Ricardo José Carvalho (head of the division ), he was detailing us one by one.

Click here to view on YouTube.

These pieces are fundamental to understand the process of evolution in the measurement of time.

Different old instruments for measuring the time used by the Official Time Hour Service (DSHO), from the National Observatory of Rio de Janeiro.
Different old instruments for measuring the time used by the Official Timekeeping Service (DSHO) of the National Observatory of Rio de Janeiro.

Among the pieces stand out different models of chronographs used in the mid-1950s, from the manufacturer Édouard Belin.

Édouard Belin, was an inventor and photographer born in France in the year 1876.
Chronographs were an instrument that measured time and maintained unity. In most analog models it was up to hundredths of a second, a chronometer at that time was a high precision certificate of a watch.

Another old chronograph
Another very interesting piece of the museum is the issuer of time signals from the manufacturer James Muirhead, famous British watchmaker.
We can also observe the first spoken recording system of the hour, it was a complex system of records made in Brazil.
In the same piece of furniture at the bottom of the piece mentioned in the previous photo, we can see a classic Collins Radio Company receiver, which was used in the mid-1950s to tune in to other world shortwave time signals.
Undoubtedly a very important piece is the first cesium clock, which began to work in Brazil in 1970, it is an HP5061A
Mr. Ricardo José Carvalho (Head of the Division) and our journalist Martin Butera, editor of this report, together in Brazil’s first atomic clock.

Room of Generation, Conservation and Dissemination of the time

Leaving behind the small museum, we continue with our tour with Ricardo José Carvalho (Head of the Division) and we are about to enter the room where the Generation, Conservation and Dissemination time racks are located.

Click here to view on YouTube.

Before, we progress further it is necessary to understand briefly what is meant by generation, conservation and dissemination of time.

What is meant by generation?

The generation of time and frequency, that is, the second atomic, is done in the Official Time Division of Brazil, by means of Cesium commercial clocks and hydrogen maser clocks.
The atomic time by the International System of Units (SI) in 1967 is defined as:
“The second is the duration of 9,192,631,770 periods corresponding to the transition between two hyperfine levels of the ground state of the cesium 133 atom radiation.”

What is meant by conservation?

The conservation of the “greatness of time and frequency”, is realised through the uninterrupted operation of the atomic clocks and their evaluation of stability by means of the measurements of time and frequency difference between the clocks.

What is meant by Dissemination?

The dissemination of the “greatness of time and frequency” is carried out by the calibration of atomic clocks, frequency counters, chronometers and other different equipment. These measurements are sent to the laboratory of the division where they are checked through other standard signals and by the official time synchronization network.

In the room where the Generation, Conservation and Dissemination time equipment racks are located, we can observe 11 racks in total, with different equipment such as generators and gong distributors, top, IRIG code, synchronism signals, NP generators, secondary clocks , temperature monitors, “no-break” phase monitors, electric power phase monitors, internet talk time monitor, ZAG 500 talk time monitor, various distributors and amplifiers, cesium registers, audio and GPS distributors (time transfer system) and much more.

In the following videos, Mr. Dr. Ricardo Carvalho, Head of that division explains and details the operation of several of these teams, we invite you to see the following video links (in Portuguese language).

Click here to view on YouTube.

Racks of equipment for Generation, Conservation and Dissemination of Time, Service of the Hour (DSHO), of the national observatory Rio de Janeiro Brazil.

Racks of equipment for Generation, Conservation and Dissemination of the time, of the Service of the official hour (DSHO), of the national observatory Rio de Janeiro Brazil.
Different views of the Racks of equipment for Generation, Conservation and Dissemination of the time, of the Service of the official time (DSHO), of the national observatory Rio de Janeiro Brazil.
Different views of the Racks of equipment for Generation, Conservation and Dissemination of time, of the Service of the hour (DSHO), of the national observatory Rio de Janeiro Brazil.
Different views of the Racks of equipment for Generation, Conservation and Dissemination of time, of the Service of the hour (DSHO), of the national observatory Rio de Janeiro Brazil.
we can observe equipment, such as the monitoring of “no-break” phases.
Technician working in the room of the Racks of equipment for Generation, Conservation and Dissemination of the time, of the Service of the official hour (DSHO), of the national observatory Rio de Janeiro Brazil.


After leaving the modern room of Generation, Conservation and Dissemination of the time, we enter into another important room – the laboratory.





Here we will find various equipment for measuring, calibrating and adjusting the time, up to a faraday cage. Also in the laboratory are jealously guarded famous atomic clocks.

Currently, the service of the official Brazilian time (DSHO), has 2 atomic clocks of the Symmetricon MHM hydrogen maser (valued at approximately 250 thousand dollars each), 12 cesium standard clocks (valued at approximately 80 thousand dollars each), they are 3 three HP 5071A clocks, 3 three Agilent 5071A clocks, 4 four Symmetricon 5071A clocks, 1 a CS4000 clock, 1 a Datum 4310A, 1 a rubidio HP5065A standard clock and two GPS / glonass / galileo-TTs-4 receivers.

Having a laboratory is essential to keep exactly calibrated the national standards of time and frequency, some of these parameters are the basis of the Brazilian Metrological Traceability of Time and Frequency.

At the international level, the traceability of national standards and Brazilian official time is established with the International Bureau of Poids and Mesures (BIPM), also with Brazilian official time is compared in real time through the Inter-American Metrology System (SIM) that it is accessed through GPS Common-View.

Faraday cage

Another surprise that we are not prepared to see was to get up close and to be able to enter a famous “Faraday cage”,

On one side of the laboratory there is a famous Faraday cage, which Dr. Ricardo Carvalho explains to us, it is a fundamental requirement for the measurement of atomic clocks, since no unknown entity can be present during the calibration process, we are talking about the calibration of atomic clocks costing 250 thousand dollars.

Faraday cage in use for calibration of the official Time of the National Observatory

Faraday’s cage was an experiment conducted by Michael Faraday to demonstrate that an electrified conductive surface has a zero electric field inside it, since the charges are distributed evenly on the outermost part of the conductive surface (which is easy to try the Law of Gauss), for example we can mention the Van de Graaff generator.

In Faraday’s experiment a metal cage was used, where an insulation and a wooden chair were placed on which Faraday sat, an electric shock was given to him and nothing happened to him, which shows that a body inside the Cage could remain there, isolated as the electrons are distributed on the outer surface of the surface.

Our special correspondents Mark Van Marx (photographer), Martin Butera (journalist) and Mr. Ricardo José Carvalho (head of the division), inside the Faraday cage, together with the calibration equipment of the atomic clocks.

Racks of diverse equipment of the laboratory, of the Service of the hour (DSHO), at the national observatory Rio de Janeiro Brazil.

Racks of diverse equipments of the laboratory, of the Service of the hour (DSHO), at the national observatory Rio de Janeiro Brazil.
Our photographer Mark Van Marx, taking photograph of the various equipments of the laboratory, of the Service of the hour (DSHO), at the national observatory Rio de Janeiro Brazil.
Different signal and frequency counters, used in the calibration of watches.

Next to the famous Clock Maser of Hidrogenio Symmetricon MHM

The most accurate watch of Brazil and also of South America, is located in the basement of the Time Service Division of the National Observatory in Rio de Janeiro, the clock is kept in a special room, with constant temperature and humidity, to be able to access to watch, you have to go through three sophisticated alarm controls, we had the honor of being able to access exclusively for the ‘DX Clube Sem Fronteiras’.

This watch comes from the United States. The approximate cost is US $ 250,000.
This atomic clock “Maser Symmetricon”, which is expected to delay or advance only one second in 10 million years runs using hydrogen.

A curious fact is that from the confirmation of the order for its acquisition, the clock took six months to manufacture. The process went through the Department of Defense of the US government. To obtain an authorization of export, since it is a device that generates time with high precision.

Our special correspondents Mark Van Marx (photographer), Martin Butera (journalist) and Mr. Ricardo José Carvalho (head of the division), together with the most accurate atomic clock in Brazil as well as in South America.

From Atomic clocks to Quantum Optics

The search for the most accurate clock is an extreme challenge. Brazil does not want to be left out and like the leading countries are using “Quantum Optics”.

If you think that everything ends up in the measurement of the time produced by the atomic clock, you are wrong, in the service of the national observatory, you are already having experiences of quantum measurements through the laser system.

In another sector of the division, there is a sophisticated optical frequency measurement device. It is obtained from a company named Menlo Systems.

Menlo Systems is a German company, founded in 2001 by Professor Hänsch, Dr. Ronald Holzwarth, Dr. Michael Mei and Alex Cable as a spin-off of the renowned Max-Planck Institute for Quantum Optics.

It is a revolutionary technique for measuring the frequency of light. This invention has been called “… the greatest advance in precision electromagnetic measurements since people started measuring frequencies”

The time division of the National Observatory of Rio de Janeiro has already begun to perform experiments with optical measurements of high precision in various applications such as optical clocks, cold atoms and molecules, metrology, distance measurements, Fourier spectroscopy and Lidar measurements.

They know that the world is increasingly ultra-precise and ultra-fast and are committed to delivering measurements made in Brazil that meet the highest standards of quality and reliability worldwide.

Different lenses used for optical frequency measurements.
Our photographer Mark Van Marx, taking photographs of optical frequency measurement lenses
A top view of the Quantum Optics measuring apparatus
Our special correspondents Mark Van Marx (photographer), Martin Butera (journalist), by the side of the sophisticated equipment of measurements of optical frequencies (Menlo Systems)

By way of final conclusion

From ancient times we have designed devices that allow us to measure time and keep it for records.

In the beginning it was carried out according to the nature, like the Sundials, which use the light to indicate the time; or the movement of grains of sand inside an hourglass, or water in the case of the clepsydra.

Subsequently, more precise devices were invented, whose operation occurs thanks to the standardisation of the time units (days, hours, seconds, etc.) of the International System.
Up to now, the most accurate of the clocks invented by humanity the atomic clock, calibrated from the vibrations of the atom of Cesium.

That now is our most modern and new starting point in what we refer as time.

Special Thanks

Final thanks, once again to Dr. Ricardo Carvalho, Head of the Service Division, the Official Time (DSHO), for freely allowing the photographers who accompanied me to cover the subjects of this report.

They are: Mark Van Marx (Photographer) and Ligia Katze (Videographer), Engineer Ozenildo de Farias Dantas, Mrs. Vilma Madalena de Assis Souza (Assistant in the Service of the C & T Division of the National Observatory Time) and Miss Letícia Reitberger (journalist of the communications consultancy Target).

To my friend, the Argentine radio listener Daniel Camporini, for writing a special prologue for this report (included in the Spanish version).

To my editor in chief, dear Chrissy Brand, for giving me the opportunity to work in South America, as a journalist for the BDXC.

Chrissy brand is European DX Council Secretary-General – BDXC Communication (http://bdxc.org.uk/).

To the dear friend and listener from India, Sudipta Ghose (VU2UT) for his adaptation to English and correction, member of the Indian DX club International (www.idxci.in)

To my friend Ivan Dias da Silva Júnior, director of the Regional DX – Sorocaba-Sao Paulo- Brazil, who collaborates in the Portuguese translations and publishes this material in the form of a micro book, for the club he directs (https://ivandias.wordpress.com/).

Finally my friend Thomas Witherspoon, director “The SWLing Post”, for publishing this report and collaborating in this way to the world of radio listening.

From left to right Mark Van Marx (in photo), Martin Butera (Journalist), Ricardo Carvalho head of the Service Division of the Official Time (DSHO), Miss Letícia Reitberger (journalist of the communications consultancy Target) and the lady Ligia Katze (Videographer), in the Generation, Conservation and Dissemination room of the time.

From left to right Martin Butera (journalist), Engineer Ozenildo de Farias Dantas and Mark Van Marx (Photographer), in the Generation, Conservation and Dissemination room of the time.
From left to right, Mark Van Marx (in photo), Mr. Dr. Ricardo Carvalho, head of the Service Division, the Official Time (DSHO) and Martin Butera (Journalist), in the laboratory.


About the author

Martin is an Amateur Radio operator with more than 29 years of experience, and has participated in DXpeditions throughout South America, with the Argentine radio callsign LU9EFO and Brazilian callsign PT2ZDX.

It is to collaborate for the newsletter of the British Dx Club (United Kingdom).

Martín is the founder of the Brazilian CREW Radio Listeners’, called 15 point 61 (15.61). Martin is Argentinian, born in the city of Buenos Aires capital. He currently lives in Brasilia DF, capital of Brazil.

Martín Butera is a journalist, documentary maker and founding member of Radio Atomika 106.1 MHz (Buenos Aires, Argentina) www.radioatomika.com.ar

About the The British DX Club

Martin Butera is a contributing journalist for “Communication” magazine of the prestigious The British DX Club. We congratulate Martín Butera for this interesting report.
If you would like to be a member of the Briitish DX Club, you can find information here http://bdxc.org.uk/apply.html

Report made, visit to Rio de Janeiro Brazil, in May 2019, written completed and published in SWLing Post in the middle of September 2019.

Please contact Martin at the following email address: martin_butera@yahoo.com.ar

Spread the radio love

Guest Post: Brazil’s newly-formed “15.61 Crew”

Many thanks to SWLing Post contributor, Martin Butera, who shares the following announcement for a new radio enthusiast group in Brazil:

The new 15 point 61 Crew

São Paulo is the largest city in Brazil, the Americas, and the seventh largest in the world, with a population of 11,300,000.


This was the stage for the meeting between Ivan Dias da Silva Junior (a recognized Brazilian radio listener with more than 27 years of experience and founder of the Regional DX) and his colleague, Martin Butera (a renowned amateur radio operator (LU9EFO – PT2ZDX), with 29 years of experience and currently a correspondent journalist for the British Dx Club, covering information from South America for the radio newsletter “Communication”).

The place of the meeting was not an accidental: we met in a noted coffee bar in the Republic Square–an iconic meeting point in São Paulo. Republic Square is located in the city center and is one of the most visited places in Brazil.

We founded the 15 point  61 Crew in São Paulo, on September 3, 2019.

The 15 point  61 Crew is not a DX club, nor a formal registered organization. We are just an informal group who like DXing.

What is the meaning behind our name? The number 15 is the dialing code of Sorocaba and  61 is the Brasília code, joining the two cities where the Crew founders are based–a distance of more than 900 km (Brazil is a huge country!).

The 15.61 Crew doesn’t have political or religious objectives. Our main objective is DXing, with an emphasis on organizing related activities: mainly DXcamps to be held in distant and exotic places, and bringing a new panorama of what is shared about DXing in our country.

We don’t have any kind of administration positions. The 15.61 Crew members are and always will be in equals.

To be a member of 15.61 Crew you just need to be active in our hobby, share information, write items, go with us to DXcamps, develop technical projects, etc.

As we aren’t a DXing club or organization, we will not have a website nor social media. We will share micro-books, especially about our activities through existing media, like the SWLing Post by our friend, Thomas Witherspoon, and by ourselves, because at the moment we are members of other radio related bulletin boards.

Our communication will be through an email address and a Paypal account for those who want to help us to continue developing our activities and also provide feedback on other projects (such as sharing content with other websites, thus creating a virtual collaboration for all).

For this purpose, we are currently developing several projects, such as a 15.61 Crew certificate program and different materials, such as caps, shirts, mugs, etc.

The 15.61 Crew members believe that there are so much things to be heard in the ether and we are prepared for it.

Ivan Dias da Silva Junior & Martin Butera

(15.61 Crew founders)

São Paulo, September 3, 2019

Thank you for sharing this Martin! I hope the 15.61 Crew enjoys some great success and champions a dynamic DX community! If you’re interested in joining this South American crew, contact Martin Butera.

Spread the radio love

Oxford Shortwave Log: DXing in the tropical rainforest of Pará, Brazil – part 2


Hi there, here is part 2 of my reception videos taken in the tropical rainforest of Pará, Northern Brazil. As I mentioned in my previous post, I took a Tecsun PL-680 with me on the trip because I didn’t want to risk losing or trashing one of my precious vintage portables but also because of the following:

  • It can handle a longwire very well without overloading (I actually only used a 5 metre wire)
  • An excellent synchronous detection circuit and audio bandwidth filtering options
  • Excellent sensitivity, as demonstrated by the many DX reception videos on YouTube
  • If it got lost or damaged it would be a pain, but not difficult to replace

So, what can you hear in the jungle? Part 2 of my group of reception videos follow below – I hope you enjoy them.

Tropical rainforest DX in Pará, Brazil: RMI Overcomer Ministry 11530 kHz


Tropical rainforest DX in Pará, Brazil: Radio Tamazuj 11650 kHz, Madagascar


Tropical rainforest SW in Pará, Brazil: Radio Nacional Brasilia 11780 khz


Tropical rainforest DX in Pará, Brazil: R Aparecida 11855 khz (TX distance 2430 km)


Tropical rainforest SW in Pará, Brazil: R Brasil Central 11815 kHz, Goiania


Tropical rainforest DX in Pará, Brazil: Voice of Turkey 11980 kHz


Tropical rainforest DX in Pará, Brazil: Radio Dabanga 13800 kHz, Madagascar


Clint Gouveia is the author of this post and a regular contributor to the SWLing Post. Clint actively publishes videos of his shortwave radio excursions on his YouTube channel: Oxford Shortwave Log. Clint is based in Oxfordshire, England.

Spread the radio love

Brazilian DX heard in Oxford UK, with venerable Sony ICF-2001D

Hi there, I thought I would share some Brazilian shortwave catches with you, obtained using my Sony ICF-2001D receiver and 200 metre experimental longwire. The first is Radio Bandeirantes, Sao Paolo on 9645.4 kHz. This is a station that I’ve only heard once or twice previously, but was received with excellent signal clarity and strength recently, using my deployable longwire antenna. I would rate this station as moderately difficult to receive with reasonable discernibility. The second is Radio Novo Tempo from Campo Grande, on 4894.9 kHz. This station I would rate as difficult to hear with discernible audio. The key is always signal-to-noise, thus moving yourself out of the ubiquitous blanket of QRM most modern environments endure will usually achieve this and of course coupled with sufficient space outdoors to erect a larger antenna will hopefully also improve signal strength. My final video on this post is Radio Nacional Brazilia on 6180 kHz. I would regard this station as quite easy to hear well; their effective TX power towards Europe is around 2 MW, however, outdoors, this station can literally boom in, with what might be perceived as local-AM signal strength. I hope you enjoy watching the videos and seeing/ hearing what’s possible with a modest set-up. As for the Sony ICF-2001D? Well the design is more than 30 years old, but in my opinion at least, still one of the very best portable shortwave receivers ever manufactured. Thanks and 73.


Direct link to Oxford Shortwave Log for reception video of Radio Bandeirantes


Direct link to Oxford Shortwave Log for reception video of Radio Novo Tempo


Direct link to Oxford Shortwave Log for reception video of Radio Nacional Brazilia


Clint Gouveia is the author of this post and a regular contributor to the SWLing Post. Clint actively publishes videos of his shortwave radio excursions on his YouTube channel: Oxford Shortwave Log. Clint is based in Oxfordshire, England.

Spread the radio love

Shortwave Radio Recordings: Rádio Nacional da Amazônia

Rio_de_JaneiroLast night, Rádio Nacional da Amazônia had a booming signal into North America on 11,780 kHz. Rádio Nacional’s AM signal was very wide; I actually opened up the filter on my SDR to 16 kHz to record this broadcast. In truth, that’s probably too wide, but it certainly made for great audio fidelity.

So, if you’re in the mood for some Brazilian music and commentary today, this 168 minute recording of Rádio Nacional da Amazônia should satisfy.

This was recorded on Sunday, April 28–starting around 22:15 UTC–on 11.78 MHz. Click here to download the full recording as an MP3 file, or listen in the embedded player below:

Want more Rádio Nacional? Click here for other recordings.

Spread the radio love

Shortwave Radio Recordings: Rádio Nacional da Amazônia

RadioNacionalDaAmazoniaThis past weekend, Radio Nacional da Amazonia had a booming signal into North America on 11,780 kHz. I recorded their broadcast throughout the night, assuming it would eventually fade; however, it did not.

So, if you’re in the mood for some Brazilian music and commentary today, this eight-hour recording of Radio Nacional da Amazonia should satisfy.

This was recorded on Sunday, January 6th–starting around 02:30 UTC–on 11.78 MHz. Click here to download the full recording as an MP3 file (276 MB!), or listen in the embedded player below:

Note to those subscribed to our podcast:
I was a bit reluctant to include a link to the podcast feed as this file is so large; I rarely make eight-hour recordings. I did offer it up, however, based on the fact that there are so many other podcasters who regularly serve up files in excess of 250 MB. If you believe this file is too large to be included as a podcast, please comment; I certainly don’t want to choke up your bandwidth or overwhelm your iPod!  But it’s wonderful listening.

Spread the radio love