Tag Archives: Don Moore

Taming the Noise: Don Moore’s Simple, Cheap Filter Solution for Traveling DXers

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Many thanks to SWLing Post contributor Don Moore–noted author, traveler, and DXer–who shares the following post:

A Cheap and Simple Noise Filter

By Don Moore

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.

My DXing career started over fifty years ago in an upstairs bedroom in tiny Milesburg, Pennsylvania. I had a consumer-grade multi-band radio and some copper wire strung from the roof to a nearby tree.  It was a simple setup but it worked very well. Do you know what I didn’t have? A noise problem. The only time I remember noise ruining my DX was when my mother was using the electric mixer and that meant she was making cookies or a cake. I never complained.

Times have changed, haven’t they? What DXer doesn’t complain about noise these days? I know people who have left the hobby because the place they lived at and DXed at for decades gradually became so noisy they couldn’t DX anymore.

Unsurprisingly, a lot has been written about how to find and eliminate noise in your home. However, most of my DXing is done as I wander the globe. I try to find places to stay at that should be good for DXing. But no matter how good a place looks beforehand, there’s no way of knowing what the noise level will be until I get there.

As a traveling DXer, I need quick, easy, and compact noise solutions. The best solution I’ve found are these CCTV distortion filters (ground loop isolators) that Brett Saylor recommended to me several years ago.

No, these weren’t designed for radio use. And they aren’t a miracle solution that will eliminate all the noise that plagues DXers. Sometimes they’re no use at all. But I’ve DXed in dozens of locations over the past ten years and there have been multiple occasions where one of these filters has turned what would have been a disappointing stay into a good DX session. I don’t go anywhere without two of these packed in my mobile DX shack.

But let me show you some results. All of these SDR screenshots were made with SDR-Console using an Airspy HF+ Discovery SDR connected to a PA0RDT mini-whip antenna.

I spent last summer in the north suburbs of Chicago and several times went to a park to test my DX equipment. Around midday, the lower shortwave frequencies were filled with noise peaks. On this first image, it’s hard to pick out WWV on 5 MHz from all the noise peaks. In the second image the filter hasn’t totally eliminated the noise, but WWV’s signal is now strong and clear.

The noise was nearly as strong on 49 meters but the filter almost totally eliminated it. CFRX’s signal on 6070 kHz was slightly weaker with the filter, but it was significantly more listenable without the noise.

Which frequencies noise affects can vary between locations. At that park the noise was gone above about 11 MHz.  While traveling across the US in mid-October, I stopped at a park just west of Kansas City to do some more DXing and equipment tests.  The noise there was bad in the middle shortwave bands, such as in the 25 meter band.

But the filter did a good job cleaning it up.

Finally, about two years ago when I was DXing in Rafina, Greece, the noise was bad on the higher bands. Here are before and after screen shots on the 16-meter band.

These filters should work with any coax-fed antenna. I’ve used them with beverages, Wellbrook loops, the PA0RDT, and the MLA-30+ loop. If the antenna has an interface, such as the last three mentioned, the filter goes between the interface and your receiver (and not between the interface and the antenna).  I’m not sure what the impedance on these is, but I’ve used them with both 50- and 75-ohm coax cable.

Sources of the Filters

An Internet search for “CCTV Ground Loop Isolator” brings up all kinds of products. They are probably all the same but I have no way of knowing that. So I recommend getting the exact ones that I have purchased. Just compare the product to the pictures of mine.

Here are links to three current sources for these exact ones on Amazon. They can also be found on eBay and other sites. [Note that all of these links are affilliate links that support the SWLing Post at no cost to you.]

A Few More Ideas

At just a couple dollars each, every DXer should have a few of these filters in their shack. But types of noise vary and at several places I’ve DXed from using one of these filters made no difference at all. When that happens I have a few other solutions to try.

The first thing I try is to either move the antenna or, if it’s directional, to point it in a different direction. On several occasions that’s all it has taken to totally eliminate what at first seemed like an impossible noise problem.

If the noise is coming in through the power lines, unplugging the laptop and DXing off of battery power might do it. (I only use SDRs powered off the USB connections on my laptop.)  If you do that, be sure to unplug the cord from the outlet and move it away from the wall.  If you unplug the cord from the laptop and leave the other end plugged into the outlet, it may act as an antenna and radiate the noise from the power lines into your SDR. And, yes, I learned that lesson the hard way!

Do you have any interesting experiences or solutions to the DX noise problem? Please leave them in the comments section. 

New SDR Recordings from Peru and Brazil Now Available via Don Moore

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Our good friend and longtime contributor Don Moore has just updated his extensive SDR recordings archive with new files from his recent travels in South America. These latest recordings—captured in Peru (February) and southern Brazil (May)—are now available to explore and download.

Don writes:

I have a webpage where most of the SDR recordings from my travels are available for download. I just added files made in Peru in February and in the far south of Brazil in May. This archive is mostly medium wave. I hope they give other DXers a chance to hear what the dial sounds like in other parts of the world. They could also be useful as a way to compare possible IDs, ads, and other programming with what you hear in your own DXing.

You can browse and download the recordings directly via Don’s archive here:

https://www.donmooredxer.com/logs/loglinks.html

Many thanks, Don, for sharing these with the SWLing Post community!

Don Moore’s Photo Album: Guatemala (Part Seven) – Radio Maya de Barillas

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Image: Radio Maya via Facebook

Don Moore’s Photo Album:
Guatemala (Part Seven) – Radio Maya de Barillas

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.

Given the subject of this final part you might assume that I eventually did make it to Barillas and get to visit Radio Maya. I wish it were so, but no. When writing part six of this series I tried to find a few interesting links about Radio Maya to include. I came across a 38-minute video about the history of the station issued on its 50th anniversary in 2012. The video is a series of still photos (most very old) narrated in Kanjobal.

Actually I’m assuming that it’s Kanjobal as that is the Mayan language spoken in Barillas. I don’t speak Kanjobal, but the Mayan languages use Spanish for numbers, dates, and modern ideas such as technical terms. Between the Spanish words and the context provided by the photographs, I was able to somewhat understand the video. Instead of expecting you to watch the 38-minute video, I’ve copied the most interesting pictures below. (I don’t think you want to see pictures of all the people involved over the years.)

Beginnings

There had been an Evangelical mission in Barillas since the mid-1950s. The name of whoever decided to put a radio station in Barillas is lost to history. But, like Father John Rompa of the Catholic station La Voz de Nahualá, they realized that radio was the best way to reach the Mayan people scattered across remote mountain towns and villages. Also lost to history is why they picked a place as remote as Barillas. Not only was the town at the end of the road, but in the early 1960s the last stretch of road wasn’t even drivable. Hauling in equipment for the new broadcaster was a challenge.

Here a man carries part of the transmitter on his back:

The transmitter eventually arrived in Barillas on an oxcart:

In these next two pictures about two dozen men haul the generator over a rough stretch of road:

The original building in 1962:

The next step was putting up the antenna. Here villagers prepare to erect a wooden pole as a center support for the antenna wires:

One of two shorter poles to hold up the lower ends of the wire:

When the pole was in place a very brave (or foolhardy?) man climbed to the top to attach the wires:

The finished tower. The antenna wires, attached at the top, aren’t visible. The lower wires are for support:

From its beginnings until the late 1970s, Radio Maya de Barillas only broadcast on 2360 kHz with this 250-watt transmitter. Later a one-kilowatt transmitter was added for 3325 kHz.

Installing the generator:

The Radio Maya studio in the 1960s:

Getting Bigger

In 1969 a plot of land was purchased on the edge of town and over the next three years a new building was constructed with help from American missionaries. Continue reading →

Don Moore’s Photo Album: Guatemala (Part Six) – Huehuetenango

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

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Don Moore’s Photo Album:
Guatemala (Part Six) – Huehuetenango

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 first heard of Huehuetenango in February 1974. I had gotten my first serious receiver, a Barlow-Wadley XCR-30, a few weeks earlier. Now I could try for stations in the 120-meter band. The first one I heard was Radio Maya de Barillas on 2360 kHz from a place named Barillas in Guatemala. And Santa Cruz de Barillas (the town’s full official name) was in a department named Huehuetenango. The name sounded exotic and magical.

In my mind, Radio Maya de Barillas was the ultimate DX target. The Evangelical Protestant station used a tiny amount of power in 120-meters, the shortwave band that provided the most challenge to DXers. The programs were in Mayan languages with mostly hard-to-pronounce names. And my map showed that Barillas was literally at the end of the road. There was nowhere to go beyond Barillas.

That sense of Huehuetenango being on the edge of civilization was totally correct. The department contains the rugged Cuchumatanes mountains, the highest non-volcanic mountains in Central America. It’s the only place in Central America where it’s too cold to grow corn. Instead, people get by raising sheep and planting potatoes. The mountains explain why eight different Mayan languages (belonging to three different language families) are spoken in this one department. Steep rugged mountains are a barrier to communication. A lack of communication causes a common language to diverge into multiple languages over just a few centuries.

The Mam, numbering about half a million, are the fourth largest Mayan group in Guatemala and their homeland extends into other departments in the south. But the other seven languages are only found in Huehuetenango with maybe a little spillover across the borders. The largest of those is Kanjobal, spoken by about 80,000 people today. The Tectiteco (Tektik) number just a little over two thousand.

As noted on the back of my QSL from Radio Maya de Barillas, that station broadcast in six of the region’s languages, including Mam and Kanjobal, the language spoken in and around the town of Barillas. For about a decade Radio Maya was the only radio station to broadcast in the region’s languages. Then in 1975 the Roman Catholic church opened an educational station, Radio Mam, in Cabricán to the south in Quetzaltenango department. But Radio Mam only broadcast in the Mam language. (And, unfortunately, I never got to visit the station.)

Visiting Huehuetenango (or not)

When I was traveling to Guatemala while living in Honduras in the early 1980s, one of my goals was to visit as many Guatemalan shortwave stations as possible. Yet I never once considered going to Barillas. Sure, I knew that the dirt road from the town of Huehuetenango to Barillas was one of the worst in Central America and that the bus ride took twelve hours. That wasn’t going to stop me.

 What stopped me from visiting Radio Maya was that Barillas was right in the middle of the area of the heaviest fighting between the government and the guerrillas. This may surprise you if you’ve read the previous parts of this series, but there really were some things back then that I knew better than to do. Going into the worst part of a war zone was one. The closest I came to Barillas was passing through the southern part of the department on the Pan-American Highway on my way to Mexico in December 1984. That was just a few weeks after a guerilla band had ventured south and blown up four bridges on the road. Continue reading →

Don Moore’s Photo Album: Guatemala (Part Five) – Visiting Nahualá

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

Santo Tomas Church, Chichicastenango, Guatemala (by Lucía García González via Wikimedia Commons)

Don Moore’s Photo Album: 
Guatemala (Part Five) – Visiting Nahualá

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.

After my first attempt to visit La Voz de Atitlán failed in June 1983, I turned my sights northward. The next morning in Panajachel I boarded a bus bound for Guatemala City but got off when the bus reached the main highway at the Los Encuentros intersection. A few minutes later I caught a ride on a ‘chicken bus’ headed north to my first destination of the day – Chichicastenango.

Chichicastenango is not a town that DXers would be familiar with but anyone who has seriously traveled around Guatemala has surely been there at least once. The outdoor markets held on Thursday and Sunday are among the largest in all of Central America. Guatemala has dozens of towns with long names ending in …tenango, meaning “place of.” Chichicastenango is the place of the chichicaste plant, in reference to a thorny bush that grows in the area. Most of the time people just call the town Chichi as it’s common to drop the tenango part from names when speaking.

For over five hundred years, Quiché Mayans from the surrounding area have been coming here twice weekly for the market held in the plaza in front of the Santo Tomás church. The steps to the church are always filled with flower vendors and men swinging containers of incense.

In the early days of the Spanish conquest, Catholic churches were often built on the sites already holy to the Indians. It was a clever way to get the newly forced converts to come to mass. In the case of Santo Tomás, however, they unknowingly picked a location of major spiritual importance in the Mayan religion. As a result many Mayan ceremonies involving nature and natural gods have survived in this area. Some became intertwined with Catholic practices while others were practiced in secret for centuries until it finally became safe to bring them out into the open again.

It was only June but I did my Christmas shopping that day and mailed everything home from Guatemala City a few days later. Guatemala’s post office was very reliable. Everything arrived safely in less than two weeks.

On to Nahualá

With my purchases packed in my now very heavy bag, I got on the next bus heading south and once again got out at Los Encuentros. This time I was looking for any bus heading west. I wasn’t going too far. A few minutes later a bus bound for Quetzaltenango stopped and I got on, telling the driver’s assistant that I wanted to get off at Nahualá.

I knew Nahualá was in the northwest corner of Sololá department a little way off the Pan-American Highway but I was surprised when about an hour later the bus stopped next to a cornfield in the middle of nowhere. I gave the driver’s assistant a puzzled look when he told me this was my stop. He explained that they could leave me off further down the highway where the road to Nahualá branched off. But it would be a long walk from there. From here, the walk was only about ten minutes. There was a well-worn path leading upwards through the cornfield, so I took him at his word. Continue reading →

Don Moore’s Photo Album:  Guatemala (Part Four) – To the Western Highlands

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

Lago de Atitlán con el pueblo de Panajachel de fondo (Photo by Larissa Gomez via Wikimedia Commons)

Don Moore’s Photo Album:
Guatemala (Part Four) – To the Western Highlands

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.

If anyone deserves recognition as the first tourists to visit western Guatemala it would be the American John Lloyd Stephens and Englishman Frederick Catherwood. In the 1820s and 1830s, Stephens traveled extensively in Europe and the Middle East and published several books about his journeys. On one of those trips he met Catherwood, an accomplished artist who traveled around the Mediterranean making drawings of archaeological sites.

The pair decided to visit Central America after coming across accounts of ruins in the region by the Honduran explorer Juan Galindo. Their trip received official support when U.S. President Martin van Buren appointed Stephens as a special ambassador to Central America.  The two men wandered the region for several months in 1839-40 visiting known Mayan sites and rediscovering many others. Stephens wrote two books about their travels, Incidents of Travel in Central America, Chiapas and Yucatán and Incidents of Travel in Yucatán while Catherwood published a book of his drawings, Views of Ancient Monuments in Central America, Chiapas and Yucatan. All three books became immediate bestsellers.

Frederick Catherwood’s 1840 lithograph of the central plaza in Quetzaltenango, Guatemala. 

The three books introduced the Mayan civilization to the rest of the world for the first time, bringing new visitors to the region. Some came to do serious research. Others were just curious adventurers. But the numbers that came were small as only a few wealthy people had the time and money to journey to exotic places.

Then the 1960s brought a new kind of tourist – the hippie. Many young people in Europe and North America saw flaws in the materialism of their own societies and became interested in experiencing non-western cultures. The Mayan region of Guatemala was a perfect destination. It was exotic, relatively easy to get to, and cheap.

That qualification of cheap was especially important. The hippies weren’t big spenders staying in classy hotels and eating at pricey restaurants. They found rooms in basic hospedajes and ate everyday local food cooked by indigenous women at roadside comedores. In many ways that was better. The money went directly to local working people instead of to the wealthy owners of fancy establishments.

The 1960s and 1970s became the era of hippie tourism in Guatemala. Most of visitors went to the area around Lake Atitlán, drawn by the lake’s natural beauty and the region’s year-round springlike climate. The epicenter of it all was the little lakeshore village of Panajachel.

Clouds of War

To anyone wandering the shoreline of Lake Atitlán in the mid-1970s, Guatemala seemed to be a peaceful place. In reality, a guerilla war was raging just a hundred kilometers away. In 1954, a CIA-sponsored coup overthrew Guatemala’s elected government and ushered in a long period of repressive military regimes. With the military showing no signs of relinquishing power, around 1965 a few leftist activists went into the remote mountains of northern Huehuetenango and Quiché departments with hopes of repeating Fidel Castro’s success in Cuba.

By all appearances, this should have been a minor footnote in Guatemala’s history. The would-be revolutionaries, after all, were city people without the skills to survive in the remote mountain highlands. But they recruited a few Mayans to their movement and then a few more until the Mayans dominated the guerilla movement. Yet the Mayans were never guided by ideology. The guerilla movement was a way of fighting back against centuries of repression, discrimination, and poverty. As one observer put it, “They’re Communists because of their stomachs, not because of their heads.”

As the guerilla movement grew the combat zone gradually moved south and into other regions. And the war became less a political revolution than an ethnic conflict. The military was dominated by Spanish-speaking ladinos who knew nothing of Mayan culture or the Mayan languages. All Mayans were seen as potential enemies, as was anyone who attempted to improve the Mayans’ lives. That lead to the formation of military-run death squads which targeted small town mayors, teachers, social workers, church leaders, and anyone else who dared to speak up. By 1981 over two hundred non-combatants were being kidnapped, killed, and dumped by the side of the road every month.

In 1976 the Lake Atitlán region had been seen as a peaceful place. A few years later the combination of active military death squads in the villages along the lake and a widening guerilla war elsewhere had put an end to that image. The era of hippie tourism in Guatemala was over. Continue reading →

Don Moore’s Photo Album:  Guatemala (Part Three)- Guatemala City Continued

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

Photo Source: Dennis Sylvester Hurd via Wikimedia Commons

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

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.

When I started DXing in 1971, and for several decades afterwards, the most widely logged Guatemalan shortwave station by DXers was Radio Cultural on 3300 kHz. It was also known as TGNA, the call letters of that 90-meter-band frequency. The medium wave outlet on 730 kHz was TGN. The station also used 5955 kHz and 9505 kHz, but those frequencies were always harder to hear because of interference from more powerful international broadcasters.

Back then this Evangelical broadcaster was owned and operated by the Central American Mission of Dallas, Texas, but only received a portion of its funding from the CAM. Additional funding came from local donations in Guatemala and another important source was selling time to American Evangelical preachers to air their prerecorded English language religious programs. These programs were broadcast late at night, when propagation into North America and Europe was best, and were always preceded by an English station identification. That made it an easier log for DXers who didn’t understand Spanish.

TGNA was the station I most wanted to visit when I arrived in Guatemala City in June 1983. But Guatemala DX Club members informed me that the station had been temporarily closed down because of “philosophical disagreements” with the government. They were off the air and would remain so for several weeks. I made four more visits to Guatemala City over the next year but somehow never found the time to visit the station. It wasn’t until my visit in December 1987 that I finally stepped inside their front door. That visit became the subject of the first article I wrote for Monitoring Times magazine in June 1988.

Wayne Berger, station manager and chief engineer, and missionary Bob Rice gave us a very long tour of the station. Wayne and Bob had built or rebuilt most of the station’s technical equipment and even some of the infrastructure. On the day we arrived they were welding a broken door back on its hinges. Wayne had built the 3300 kHz transmitter, shown in the next picture, out of spare parts.

Main studio control room at TGNA in 1987.

At the time of my visit, TGNA had two pennants. The larger one was mostly reserved for local listeners. The smaller one was sometimes included with QSLs to lucky DXers.

But neither of those compared with these traditional handmade weavings given by listeners for the station’s 37th anniversary in August, 1987. (I just wish my color photos had survived.)

English ID from Radio Cultural, 3300 kHz, as heard in Pennsylvania 23 November 1979 at 0427 UTC:

Radio Cultural, 3300 kHz, as heard in Michigan 23 March 1989 at 1101 UTC:

Easter in Guatemala

Of all the things I’ve seen in my travels, the Easter processions of Guatemala certainly rank near the top. I am fortunate to have been in Guatemala twice for the holiday, in 1982 and 1984, and I plan a return trip in the next few years. Processions take place all over Guatemala during Easter week, but the most elaborate take place on Easter Thursday and Good Friday in Guatemala City and, especially, in Antigua, the old capital twenty kilometers to the west. There are several processions both days in each city and each procession takes several hours. Continue reading →