Category Archives: AM

Carlos Visits the Studios of UFRGS Radio

Visiting the studios of the University Radio of Rio Grande do Sul, Porto Alegre, Brazil

by Carlos Latuff

On the morning of Thursday, February 27, 2025, I visited the studios of the radio station of the Federal University of Rio Grande do Sul (UFRGS in Portuguese) in Porto Alegre, Brazil. Founded in 1950, it’s the first broadcaster in Brazil operated by a university, which currently broadcasts on medium wave (AM) and over the Internet (streaming): https://www.ufrgs.br/radio/ao-vivo/

Headquarters of the UFRGS radio studios in Porto Alegre, Brazil.

The programming focuses mainly on classical music, but it also has programs of other musical styles. Despite the technical, bureaucratic and financial difficulties (a typical scenario of state radio stations in Brazil), the UFRGS Radio has been operating thanks to the efforts of its team. One of the things that catches my attention at this station is the news bulletin, broadcast on weekdays at 12:00 p.m. local time, presented by Mrs. Claudia Rocca.

News bulletin from UFRGS Radio, voiced by Mrs. Cláudia Rocca.

The bulletin is 10 minutes long and brings local, national and international news, some of which are suitable for my already traditional illustrated radio listening.

According to the station’s director, Mr. Claudio Roberto Dornelles Remião, the UFRGS radio station, like most AM radio stations in Brazil, will migrate to FM, but there’s still no set deadline.

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Beyond DXing: Analyzing Medium Wave Propagation During the 2023 Annular Eclipse

The following article dives into medium wave (MW) radio propagation during the 2023 annular solar eclipse, building upon insights from the 2017 total solar eclipse when DXers made broadband radio recordings of the whole MW band for the first time. Unlike that previous study, the 2023 research took a methodical approach, with standardized data collection, stable receivers, and GPS-synchronized frequency locking. Thirteen radio enthusiasts across North America and Europe contributed to the study, capturing 10 Terabytes of SDR data. Using Carrier Sleuth software, researchers pinpointed key signal strength variations, with some regions experiencing remarkable boosts in signal during the eclipse. These findings highlight how eclipse-induced propagation effects are not the same as those seen during typical sunrise and sunset transitions. The study opens doors for further exploration into whether these effects are symmetrical and how they might relate to ionospheric thinning along specific signal paths.  The article ends by asking assistance from DXers to help ID enhanced signals in the 2023 eclipse data sets.  

Medium Wave Monitoring During the 2023 Annular Solar Eclipse—Not Just About DXing

By Nick Hall-Patch, VE7DXR

Background        

The 14 October 2023 annular solar eclipse was the first one to cross the continental United States since the total eclipse of 17 August 2017. From a DXing standpoint, 2017 was the first eclipse in which there was widespread use of software defined radios (SDRs) to record the entire medium wave (MW) band throughout the duration of the eclipse.  Therefore, it was possible to study eclipse receptions after the fact rather more than had been the case during earlier ones. Several IRCA members recorded the 2017 eclipse on their SDRs, and in the months after the eclipse, data files from several locations were examined. It was therefore possible to evaluate the varying signal strength of KSL-1160’s carrier from four different locations in western America, all from outside the path of totality, and to speculate upon the differences in the responses at each site.

That study of KSL’s strength variations during the eclipse led to a presentation at the St. Louis IRCA/NRC convention in 2018, and eventually to an IRCA Technical column (now IRCA Reprint G-096 at  http://dxer.ca/images/stories/2019/irca-reprint-index.pdf) which proved to be of interest to HamSCI, an amateur radio citizen science group that had already been using amateur radio communications as a way to study that eclipse’s effects upon the ionosphere. A version of the article appeared on HamSCI’s website and the SDR files referenced by the article were also hosted by the HamSCI community on zenodo.org, along with SDR data from three further locations in eastern America. (Go to zenodo.org, and search on the phrase “Solar Eclipse 2017 recordings” to examine this data for yourself.)   Zenodo is a long-term open repository for scholarly work, and these data sets have since been downloaded hundreds of times.

Why would these 2017 SDR files have been of interest to an organization studying radio wave propagation?  Unlike the short duration communications found on the amateur radio bands, medium wave (MW) AM broadcasters, assigned between 525 and 1705kHz, provide continuous signals, many for 24 hours a day. Their carrier frequencies are like steady RF beacons.  Any changes in that beacon’s amplitude or frequency at a receiver are likely to have been caused by changes in the path between transmitter and receiver. By using suitable hardware and software, either monitoring a single frequency or the entire medium wave broadcast band using SDRs, the resulting files can allow us to characterize the propagation induced changes that these carriers undergo over time, including variations in signal strength and apparent shifts or spreading in the frequency of each carrier.   During a solar eclipse, the brief period of darkness along the path of the eclipse can allow AM broadcasters’ signals to temporarily travel much further than they would normally in the daytime, and it is possible to study variations that occur even more quickly than those occurring daily during sunrise and sunset.

Preparation for the 2023 Solar Eclipse

From a DXing standpoint, the 2017 eclipse SDR files were more than functional, but a closer examination revealed gaps in the data, changes of antennas when it suited the DXer, and receivers that had not been properly warmed up, resulting in recorded carriers that appeared to be drifting.  From the standpoint of a scientist, this was “found data” requiring judicious handling and compensation.  In addition, the data had been transferred many months after the recording had taken place, and sometimes it was no longer clear how the receivers and antennas had been set up for the recording.

Nearly a year before the 2023 eclipse, HamSCI had decided that it would be interested in examining more MW SDR data, but this time asking that the recording of the data be approached in a more professional fashion.  In other words, participating DXers would be asked to think a bit more like scientists for the duration of the recordings.  Making recorded IQ files of optimum use to propagation researchers would include the following:

  • Documenting receiver, software and antenna used, with as many details as possible.
  • Not making changes in receiver or antenna configuration during the recording period; if absolutely necessary, recording that change in detail, especially the time that it occurred.
  • Warming up the receiver for several hours before recording in order to minimize apparent carrier drift in recorded signals.  Better yet, encouraging participants to use SDRs that were locked to a frequency standard such as the Bodnar GPS reference clock, because a frequency locked SDR’s data would display frequencies with stability and accuracy, and allow characterization of any carrier Doppler shifts.
  • Making sure that timestamps in their recorded data were as accurate as possible, at a minimum setting the computer clock accurately immediately before recording, and preferably to use a network time protocol (NTP) time client on the computer that would be recording the SDR IQ files.
  • Starting recording well before maximum totality in their area, until well after that time; one hour before the start of the partial eclipse to one hour after the end of the partial eclipse were suggested as a minimum.
  • If possible, making additional SDR recordings of, for example, the period from two hours before and after sunset and sunrise on the day of the eclipse, and also making a reference recording of the eclipse time period on another day.

Figure 1 shows the path of the 2023 eclipse and the times of maximum obscuration.  Efforts were made to involve monitors in both North and South America, and in the end, 13 participants were involved in the experiment, using 14 sites in Canada, the USA, Mexico and Portugal.

Figure 1

  • 12 sites also included data from local sunrise (LSR) and/or local sunset (LSS)
  • 12 sites also recorded data from the same time as the eclipse period on another date in order to provide a reference of a normal day’s reception conditions
  • 6 sites produced data using an SDR locked to a frequency standard that was disciplined using GPS signals. Three of the remaining sites included a signal from a frequency standard in their data recording.
  • 10 sites recorded using computers that had their clocks updated using Network Time Protocol (NTP); others set computer time manually

About 10 Terabytes of SDR recordings were submitted for analysis, which is one heck of a lot to poke through in order to find signals fading up and down for a few minutes during the course of the eclipse. Fortunately, it was possible to pre-process all of the files using Carrier Sleuth software which allowed visualization of hours of data at a time from each MW channel, all available to 0.1Hz resolution over an 80Hz span centered on each broadcast channel.  It was then a fairly quick process to scan through each of the 117 channels of the AM broadcast band for each data set, searching for unusual carrier enhancements appearing during the eclipse time period.

An example is shown in Figure 2, portraying 1650 kHz as logged during eclipse enhancement in Phoenix, AZ by Burke Baumann KF7NP. The thin lines representing various carriers are represented in “hotter” colors when signal strength increases.

Figure 2

Because Carrier Sleuth can rapidly generate a chart for signal strength vs. time for each individual carrier, it was decided arbitrarily that a carrier that increased in strength by at least 10dB during the duration of the eclipse at that site would be deemed to have been influenced by the passage of the moon’s shadow.  By that metric, six sites indeed reported that during the eclipse, different broadcast signals appeared from those normally received in the daytime.  However, other sites did not, or received only a few traces of carriers during the eclipse period.

Figure 3 shows the various sites that submitted SDR data, indicated by pale blue circles, and within each circle is the number of AM broadcast band channels on which eclipse effects were noted, even if it was just a carrier.

Figure 3

From Figure 3, it can be seen that locations in Canada’s west and in the south and west of the USA were likely to have been influenced most by the passage of the eclipse. In contrast, it appears that those who were in locations of less than 50% of totality were unlikely to have seen much effect from the passage of the eclipse. Continue reading

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Don Moore’s Photo Album:  Guatemala (Part Two) – Guatemala City

Many thanks to SWLing Post contributor Don Moore–noted author, traveler, and DXer–for the latest installment of his Photo Album guest post series:


Image Source: Wikimedia Commons

Don Moore’s Photo Album:  Guatemala (Part Two) – Guatemala City

by Don Moore

More of Don’s traveling DX stories can be found in his book Tales of a Vagabond DXer [SWLing Post affiliate link]. If you’ve already read his book and enjoyed it, do Don a favor and leave a review on Amazon.

Guatemala City, the country’s capital, is the political, economic, and social hub of the country. The next largest city, Quetzaltenango, is less than a fifth as big. Guatemala City also forms a pivot point dividing the country. The departments to the west and the Verapaz region to the north are heavily indigenous. Quiché department is named after the country’s largest Mayan group. The Pacific departments to the south and those to the east are mostly populated by Spanish-speaking ladinos, which is what mestizos of mixed Spanish and indigenous heritage are called in Guatemala. It’s the ladinos and Guatemala’s small European-descended upper class who rule the country. Although the Mayans and a few smaller groups represent half of Guatemala’s population, the country has never had an indigenous president. That’s not where the power lies.

While I was working in Honduras, all of my visits to Guatemala included a few days in Guatemala City. It wouldn’t make anyone’s lists of Latin America’s best capitals but I always enjoyed returning. It felt like a city. Honduras’ capital of Tegucigalpa felt like an overgrown small town.

Guatemala City had a very diverse radio scene with stations programming for all the segments of the population. You could tune in everything from Guatemalan marimba music to English-language rock to Spanish-language romantic pop to Mexican ranchera to Argentine tango. There was even a commercial classical music station on medium wave. Several of the stations – Radio Nuevo Mundo comes to mind – had very professional news departments. And three of Guatemala City’s radio stations broadcast on shortwave.

But for me the best part of visiting Guatemala City wasn’t the shopping or the museums or even visiting the radio stations. It was getting to see my friends in the Guatemala DX Club.

Guatemala DX Club

In early 1983 I connected with the Guatemala DX Club through Radio Netherlands’ Spanish language DX program, Radio Enlace.  I first got together with them on my second visit to Guatemala in June 1983 and then made a point of visiting them every time I came to the city. The GDXC had several dozen members, mostly in Guatemala City. Only about eight or ten regularly participated in club events and those are the ones I met. The club had occasional meetings, sometimes organized visits to radio stations, and published an annual newsletter. They also produced a weekly fifteen-minute DX program on La Voz de Guatemala.

This photo was taken during my last visit in December 1987. In the back row are Carlos Zipfel Valencia, Jorge Luis Álvarez, and Edgar Oliva. Me and Ralf Gruner are seated in front.

Edgar was an official monitor for Deutsche Welle and had a beautiful huge Grundig receiver that the station had gifted to him. It had been sent by diplomatic pouch to the West German embassy where he had picked it up in person.

Carlos’ father, Carlos Zipfel y García, was a well-known Guatemalan writer but Carlos was more interested in the spoken word of radio. After getting a communications degree he received professional training through programs run by Radio Netherlands and Deutsche Welle and pursued a career in broadcast journalism and management. At different times he’s served as a producer for La Voz de Guatemala, director of Radio Universidad de San Carlos, and in various roles for several public and non-government organizations such as the Federation of Guatemalan Radio Schools.

I’ve always liked the GDXC pennant. It was intentionally designed to point left so that it would easily fit on the wall between the usual right-pointing radio station pennants. Only a DXer would think of doing that! The design features Guatemala’s national bird, the quetzal, which is known for its long tail feathers.

La Voz de Guatemala

During my first visit with the club, Carlos used his day off to take me to visit the radio station he was working at plus several more medium wave and FM stations. He already had many professional contacts so I had some very memorable station tours. Carlos also used his press credentials to get me a private tour of part of the Palacio Verde, or presidential palace.

The station I was most interested in seeing was the official government radio station, TGW La Voz de Guatemala, also sometimes called Radio Nacional de Guatemala. I had a very long visit there as Carlos, of course, had connections. It was he who produced the club’s weekly DX program on TGW.

The Estudio Maya was a spacious room where live marimba music concerts were broadcast each week. The station even had its own handmade marimba. The use of the name Estudio Maya is interesting. Guatemala embraces the historical image and importance of the Mayans while at the same time ignoring the present-day Mayan population. Half of Guatemala’s population speak Mayan languages but the national radio station only broadcast in Spanish.

Visiting radio stations usually includes collecting souvenirs and TGW didn’t disappoint. Here are several items from the station’s 50th anniversary in 1980. I also picked up several QSLs signed and sealed not just by the head station producer but also by Carlos on behalf of the Guatemala DX Club.

TGW La Voz de Guatemala, 640 kHz, as recorded in Guatemala City in June 1983:

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A Musical Interlude

The marimba is Guatemala’s national musical instrument and if you ever heard one of Guatemala’s shortwave stations you surely heard the music. Like the banjo, the marimba is an instrument that always sounds happy. It’s impossible to play a sad song on one. The instrument is like a xylophone but is made of wood. Although smaller ones do exist, a true marimba requires seven musicians playing in unison. A live concert is an amazing sight. Continue reading

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AM Band RF Noise Study

 

Photo by Brock Wegner on Unsplash

Many thanks to SWLing Post contributor, Dennis Dura, who shares the following article from Radio World:

NRSC Releases Details of AM Band RF Noise Study (Radio World)

Noise levels remained consistent throughout different environments, even in downtown Baltimore

The National Radio Systems Committee’s AM Improvement Working Group has published a study examining the effects of RF noise on AM radio reception in cars.

Radio World readers will find the study’s scientific detail of interest. Noteworthy was how RF noise on the road often did not vary amongst the diverse environments sampled. Overcoming downtown building signal degradation was more of a concern, according to the study’s authors. Additionally, the study found field strength projections of AM signals to often not be reflective of contour predictions.

The group’s study intended to provide a better understanding of how AM radio reception is affected by RF signal strength and noise in a range of roadway environments. The authors also provided some suggestions to overcome signal loss. [Continue reading…]

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Dan Reviews the Radel RT-860

Many thanks to SWLing Post contributor, Dan Van Hoy, who writes:

Because I [purchased a RT-470L last year], Radtel sent me news of their brand new RT-860. No need to mod the radio like a Quangsheng. It does LW/MW/SW with SSB/CW (rx only, of course) out of the box for less than $50! I just posted a short preliminary review of the RT-860 on YouTube:

Click here to view on YouTube.

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Don Moore’s Photo Album: Guatemala (Part One) – The East

Many thanks to SWLing Post contributor Don Moore–noted author, traveler, and DXer–for the latest installment of his Photo Album guest post series:


Don Moore’s Photo Album: Guatemala (Part One) – The East

by Don Moore

More of Don’s traveling DX stories can be found in his book Tales of a Vagabond DXer [SWLing Post affiliate link]. If you’ve already read his book and enjoyed it, do Don a favor and leave a review on Amazon.

I’ve wanted to do a feature on Guatemala ever since starting this series a few years ago. From a cultural perspective it’s one of the most fascinating countries in Latin America. About half the population are indigenous, primarily Mayan, and most of them still speak their own languages. For several decades Guatemala’s religious broadcasters – Roman Catholic and Evangelical Protestant – used many of those languages on shortwave where we DXers were able to hear them.

I made five visits to Guatemala from 1982 to 1984 while in the Peace Corps in Honduras and returned in December 1987 while in graduate school. I spent enough time in Guatemala that there’s an entire section of my Vagabond DXer book filled with stories of my travels and station visits. In this seven-part series you get to see the pictures.

The map below shows the country, minus the sparsely populated northern department of Petén. We’re going to start in the least interesting part of Guatemala, the east. There’s very little indigenous culture left in that region nor much else of interest to the visitor. But you do have to pass through it to get from Honduras to the rest of Guatemala … and there were some radio stations to visit.

The main border crossing between Honduras and Guatemala has always been near Esquipulas in southern Chiquimula department. (That’s where the header photo comes from). But about 40 kilometers to the north is a secondary crossing near the town of Jocotán. In the 1980s, the road was rough and unpaved and the best mode of transportation was hitching a ride in the back of a passing pickup truck. The border consisted of just two wooden shacks, one on each side, minded by bored soldiers. That’s where I entered Guatemala on my second visit in June 1983. Jocotán had a radio station that I wanted to visit.

Eastern Guatemala may not have had much of interest, but the large Mayan ruins of Copán are just across the border in Honduras. The most direct route there from Guatemala City is via Jocotán so typically a few backpackers pass through town every day. I found a room at the Pension Ramirez. At $1.50 a night it was the perfect place for Peace Corps Volunteers, backpackers, and others at the very bottom end of the budget travel scale. I got a bed with sheets that may have been washed within the past week, a table, a chair, and a dim light bulb hanging from the ceiling. The shared bathroom was down the hall. Cold water only. But the Pension Ramirez had one thing that I never encountered at any other such lodging. The owner had a business card.

Jocotán was home to Radio Chortís, a Roman Catholic broadcaster that mostly ministered to the Chortí Indians who lives in the region. As most of the Chortí had assimilated into the dominant Spanish culture the station primarily broadcast in Spanish with just a few hours in the Chortí language each week. Radio Chortís used to put a strong signal into North America on 3380 kHz. The station was part of a mission funded by donations from Belgian and West German Catholics. The studios and offices were in a large complex that also included vocational training facilities and a print shop for the church. That explained why the back of their QSL letters always had a colorful station graphic.

Radio Chortís, 3380 kHz, as heard in Pennsylvania 30 December 1979 at 1152 UTC:

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On to Cobán

Early the next morning, I took a bus to Chiquimula, the departmental capital. DXers may recognize the town as the location of Radio Verdad, the last active shortwave broadcast station in Central America. It came on the air long after my time there so I never got to visit the station. In Chiquimula I switched to a bus bound for Guatemala City, but that wasn’t my final destination. I got off at a little crossroads just before the town of El Progreso and then boarded the next bus heading north to Cobán, capital of Alta Verapaz.

In Cobán I planned to visit another Catholic broadcaster, but one with a rather unusual name for a religious station. In the 1520s, the Spanish conquistadores quickly overran most of Guatemala but the Kekchi Indians in their mountainous homeland proved impossible to defeat. The Spanish dubbed the region Tezulutlán from an archaic Spanish phrase that meant “Land of War.”

In the 1540s, the Spanish tried another method to subdue the region, this time allowing Dominican friars under Bartolomé de las Casas to attempt to convert the Kekchi to Catholicism. Where the soldiers had failed the padres succeeded and the newly pacified region was renamed Verapaz, or Land of True Peace. Bartolomé de las Casas was a good man who left a legacy of trying to protect the rights of the Indians in a time of brutal conquest. But he was just one man in a time of boundless greed. He left the region a few years later and the Kekchi were forced into peonage just as the Mayans elsewhere in Guatemala had been.

And so four centuries later when the Roman Catholic diocese in Verapaz, the land of true peace, set up a radio station they named it Radio Tezulutlán, after the land of war. Someone had a keen sense of irony. But maybe there is something symbolic there as well. The Kekchi, after all, have survived as a people with their own language intact. Today they number over half-a-million, or almost eight percent of the Guatemalan people. That Radio Tezulutlán broadcasts primarily in Kekchi, not Spanish, might just be a final victory for the Kekchi.

The next few pictures show the Radio Tezulutlán building and studio from 1983 and the QSL card and pennant that I picked up on my visit. The QSL was for their little-used frequency of 3370 kHz. They mostly used 4835 kHz.

Radio Tezulutlán, 4835 kHz, as heard in Pennsylvania on 24 December 1979 at 1153 UTC:

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More Broadcasters in Verapaz

In Santa Bárbara, Honduras, where I was living in 1983, one of the best heard Guatemalan medium wave stations was Cobán’s Radio Norte on 680 kHz. I stopped by in the evening hoping to pick up a QSL but the only person there was a lone announcer who was too busy to help me. I may not have gotten the QSL but I did pick up something that I’ve since come to see as even more valuable.

In my book, I explain how one of the primary sources of income for small town radio stations in that era was reading personal announcements and greetings on the air. The Radio Norte announcer had a stack of forms that listeners had filled out with messages to be read on the air. He was throwing away some that had already been read, so I took one.

The form could be either mailed to the station or hand-delivered, as this one apparently was. The message is a birthday greeting from Imelda to her son Mario Agusto. At the top, the date the message is to be read is listed and the place is listed as San Juan Chamelco. This is important as the announcer would first say something like “Atención! San Juan Chamelco!” to get the attention of listeners in that town. At the bottom are instructions as to when the announcement should be read – the 18:30 marimba music show. The form is a very unique radio station souvenir. I only wish I had taken the entire pile out of the trashcan.

Radio Norte, 680 kHz, recorded in Cobán during my June 1983 visit:

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I also made a side trip to the neighboring town of San Pedro Carchá where I got a sort-of-QSL from Radio Imperial on 925 kHz. If you’ve read my book you know that a picture of the secretary would be a lot more interesting than this one of the front door.

A New Shortwave Station

For thirteen years the Roman Catholic church and Radio Tezulutlán had the Kekchi language airwaves all to themselves. But Evangelical Protestantism had been gaining ground in Guatemala for several decades and in 1988 the Evangelical station Radio Kekchi began broadcasting on the shortwave frequency of 4845 kHz. Radio Kekchi must have had friends at the Ministry of Communication as that assigned frequency was just 10 kHz above Radio Tezulutlán’s 4835 kHz. That certainly made it easier to poach listeners from the competition.

In one more bit of strangeness, Radio Kekchi was located sixty-five kilometers northeast of Cobán in the town of Fray Bartolomé de las Casas. So the Evangelical radio station was put in a place named after the priest who originally converted the Kekchi to Catholicism. Maybe the region should be renamed The Land of Irony.

Radio Kekchí, 4845 kHz, as heard in Ohio on 5 September 1988:

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Language or Dialect?

In much of the common literature about Guatemala it says that the indigenous people speak Mayan dialects. And back in the day when these stations were active on shortwave, DXers’ loggings often referred to hearing Mayan dialects. But I called Chortí and Kekchi languages, not dialects. What’s the difference?

Linguistically, a dialect is a regional variation of a language. The different dialects of a language are always mutually intelligible. American and Britons speak different dialects of English but have no trouble understanding one another except for the occasional confusion over a word or phrase. Speakers of Spanish and Portuguese can understand one another a little bit but not enough to have a real conversation. Those are distinct languages.

On the other hand, Danes, Norwegians, and Swedes have no trouble carrying on a conversation with each speaking their own language. That’s because linguistically they are speaking dialects of the same language. So why are Danish, Norwegian, and Swedish considered different languages? Linguist Max Weinrich once explained “a language is a dialect with an army and a navy.” He might have added an economy, a government, and international respect.

Languages spoken by people who are held in low prestige are often called dialects not for any linguistic reason but simply out of prejudice. It’s a subtle way of indicating these people and their culture are of less importance. This is true not only of Guatemala’s indigenous languages but of many others around the world. Chortí, Kekchi, Quiché, Cakchiquel, and all the other two dozen indigenous languages of Guatemala are just as distinct from one another as are Spanish, French, and Italian. So show them some respect. Call them languages, not dialects.

A DX Oddity

Let’s end part one of this series with an unusual bit of radio history. Aeronautical beacons are stations that broadcast a short morse code identifier over and over. Pilots use them for direction finding in lining up with the runway during bad weather. Today these are only found in the longwave band but there used to be a handful of Latin American beacons on frequencies just above the old top of the medium wave band. One of those was RAB on 1613 kHz at Rabinal, about 45 kilometers south of Cobán. It used to be an easy catch all over North America, but here’s a recording I made of it in nearby Honduras.

Beacon RAB, 1613 kHz, as heard in Santa Bárbara, Honduras, on 12 November 1982 at 0508 UTC:

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Next: Part Two – Guatemala City

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