Earlier this week, I stumbled upon this Bell Telephone short film about the beginnings of the mobile phone network:
I don’t know about you, but I love the view inside the trunk of the car! I bet that tube receiver and transmitter both weighed over 100 pounds. Although the system wasn’t full duplex, it must have felt pretty amazing to place phone calls while mobile.
For more vintage films like this one, check out the Periscope Film YouTube channel.
I have enjoyed three to four medium wave and shortwave DXpeditions per year since 1988, to sites on the Washington and Oregon coasts. I love the chance they give to experiment with antennas in a (hopefully!) noise-free location, and concentrate on catching stations that might not be heard from home.
All of my DX trips have been via car–until now! I’ve just returned from nine vacation days in Hawaii (Waikoloa Beach, on the Big Island), and I thought others might like to see the radio related items I chose to take along for air travel. I’m pleased to report that everything worked as planned, and I have five days of SDR IQ WAV files of the MW band for review, all recorded in the time frame surrounding local dawn.
My goal was not the smallest, most compact portable setup, but one with high performance and modest size. Fitting everything into a day pack was another requirement. A simple wire antenna and an even smaller Windows tablet or laptop than the one I’ve used (and a smaller SDR like the HF+ Discovery, for that matter) would make a much smaller package. However, the items I’ve assembled worked excellently for me during my enjoyable Hawaii vacation. The directional loop antenna provided nulls on medium wave of 30 dB during preliminary tests indoors, a less-than-ideal test situation.
Waikoloa Beach–just one of a zillion picturesque scenes in Hawaii.
Here is a list of what I’ve put together for my DXing “kit”:
All the contents of this DXing setup fit a standard size day pack.
You’ll note the absence of headphones in the list. This is because my intent from the start was to record all the DX (MW band) as SDR WAV files for DXing post-vacation. That said, I did have headphones in my travel luggage for later spot checks of a few frequencies. That’s how I found 576 kHz Yangon, Myanmar lurking at their 1700 sign-off with national anthem and English announcement. The remainder of the DX to be uncovered will have to wait until I’m back home near Seattle!
The LMR-600 is a very thick and stiff coax cable, whose diameter approaches that used in the standard aluminum tubing ALA1530 series from Wellbrook. It has the benefit of being self-supporting in a 2-turn configuration and will also coil up into an approx. 12-inch package for transport. It just barely fits within the day pack I’m using. As I understand it, magnetic loops with tubing or large coax as the active element, versus simple wire, are more efficient in operation. Whether or not this holds true in practice remains to be seen.
I fashioned a wooden disc 3/4″ thick to attach the ALA1530 head amplifier, as I didn’t want to bring along a tripod or other support stand. The Wellbrook antennas all work well near or at ground level, so I was able to get great reception with the antenna right on the beach. The diameter at two turns of the coax is only a few inches smaller diameter than Wellbrook’s aluminum tubing loops. Three strips of strategically placed Velcro straps help keep the turns together when deployed as well as during storage.
In theory a two-turn loop should give 5 dB less gain than a single turn version; however, my older ALA1530 module has 5 dB more gain than the newer “LN” type, according to Andrew Ikin of Wellbrook Communications. The net result is that my two-turn antenna should have equal gain to the larger one-turn variety. Future experimentation with this DIY coax loop antenna is in order!
The Wellbrook loop antenna, RSPdx receiver, and Windows 10 tablet on the beach in Waikoloa, Hawaii.
Another view of the DXing position. Being this close to the water with my radio gear was unnerving at first, but the wave action on a calm Hawaii beach is totally different from the Oregon/Washington beaches with waves that can move in and out by a hundred feet or more.
The Wellbrook “DIY FlexLoop” works fine at beach level, and is less conspicuous this way, too.
The ALA1530 module is bolted to the 11-inch wooden disc for support. I’ve modified the module’s sockets to securely hold SO239 female connectors.
The commercial Wellbrook FLX1530LN is a fine product, and worthy of your consideration as a compact and high performance travel antenna. Full details can be found at this link.
SDR WAV Files for Download
One of my goals from the start for my Hawaii trip was to bring back SDR “IQ” WAV files for sharing with others. These approx. 900 Mb files cover the entire medium wave band as heard from my beach location in Waikoloa.
The overall page is: https://archive.org/details/@4nradio Clicking on any of the entries will bring you to a details page. From there just right click on the “WAVE” link, and choose “Save as…” to download. For a few of the recordings I also posted the file that precedes the one that goes across the top-of-the-hour, because things seemed a bit more lively prior to 1700 (which was at local sunrise, give or take a couple of minutes).
The IQ WAV files are only playable with suitable SDR radio software: SDRuno is first choice (but you need a RSP receiver connected). The files are also is compatible with HDSDR and SDR-Console V3. It may also play on Studio 1 software.
I hope other DXers enjoy the chance to tune through the MW band, as heard from the Big Island of Hawaii.
Guy Atkins is a Sr. Graphic Designer for T-Mobile and lives near Seattle, Washington. He’s a regular contributor to the SWLing Post.
From the Isle of Music, February 23-29:
This week, our special guest is Jesus”Aguaje” Ramos, a veteran of the Estrellas de Areito, Buena Vista Social Club and many other projects,
who will present his excellent new big band recording, De Vueltabajo Llegó.
The broadcasts take place:
1. For Eastern Europe but audible well beyond the target area in most of the Eastern Hemisphere (including parts of East Asia and Oceania) with 100Kw, Sunday 1500-1600 UTC on SpaceLine, 9400 KHz, from Sofia, Bulgaria (1800-1900 MSK)
If you don’t have a shortwave radio or are out of range, you can listen live to an uplink from a listening radio in the Netherlands during the broadcast at
http://websdr.ewi.utwente.nl:8901/?tune=9400am
2. For the Americas and parts of Europe, Tuesday 0100-0200 UTC on WBCQ, 7490 KHz from Monticello, ME, USA (Monday 8-9PM EST in the US).
If you don’t have a shortwave or are out of range, you can listen to a live stream from the WBCQ website here (choose 7490): http://www.wbcq.com/?page_id=7
3 & 4. For Europe and sometimes beyond, Tuesday 1900-2000 UTC and Saturday 1200-1300 UTC on Channel 292, 6070 KHz from Rohrbach, Germany.
If you don’t have a shortwave radio or are out of range, you can listen live to an uplink from a listening radio in Europe.
Visit our Facebook page at https://www.facebook.com/fromtheisleofmusic
Uncle Bill’s Melting Pot, February 23 and 25:
Episode 153 takes us to Colombia with thanks to Cesar Rodríguez Charry for some excellent recommendations.
On WBCQ only, there is a second half-hour featuring one of the first episodes of our show in 2017.
The transmissions take place:
1.Sundays 2300-0000 UTC (6:00PM -7:00PM Eastern US) on WBCQ The Planet 7490 KHz from the US to the Americas and parts of Europe
If you don’t have a shortwave or are out of range, you can listen to a live stream from the WBCQ website here (choose 7490): http://www.wbcq.com/?page_id=7
2. Tuesdays 2000-2030 UTC on Channel 292, 6070 KHz from Rohrbach, Germany for Europe.
If you don’t have a shortwave radio or are out of range, you can listen live to an uplink from different web SDRs in Europe.
Visit our Facebook Page at https://www.facebook.com/UncleBillsMeltingPot
Radio Waves: Stories Making Waves in the World of RadioBecause I keep my ear to the waves, as well as receive many tips from others who do the same, I find myself privy to radio-related stories that might interest SWLing Post readers. To that end: Welcome to the SWLing Post’sRadio Waves, a collection of links to interesting stories making waves in the world of radio. Enjoy!
Many thanks to SWLing Post contributors Marty, David Iurescia (LW4DAF), and Phillip Novak for the following tips:
“Radio Bulgaria needs to resume its sound presence and we are to work together with the team, in order to build a firm concept in this direction.” This was what BNR Director General Andon Baltakov said in his first interview with Radio Bulgaria.
On the eve of Radio Bulgaria’s 84th anniversary, which is celebrated on February 16, 2020, Mr. Baltakov said that broadcasts of the National Radio aimed for foreign countries would be modernized, but would preserve their philosophy – being Bulgaria’s window to the world and vice versa. You can read the whole interview here. […]
Tucked away in the hills of Jharkhand’s Latehar district, Asur, a particularly vulnerable tribal group, may not have access to good road or means of transportation to the outside world, but that has not deterred them from saving their language. Using mobile radio, the Asur community has been spreading the popularity of the language within their geographical limits.
As the voice Dahan-Dahan Turrarr .. Dang T inatang Turrarr.. Noa Hake Asur Akhada Radio Enegabu Degeabu Siringabu Urrarr (Come, sing, dance and talk.. This is Asur Centre Radio) is played out through loud speakers, the bustle at the weekly market at Kotia seizes briefly, as people turn their attention to the sound system that transmits songs and news transmitted in their native language.
Attention of the Asur tribals assembled at the market is immediately diverted to the sound system that transmits songs, news and information about government schemes — all in their native dialect.
[…]“The initiative has got a huge response from people. Now, villagers are requesting us to organise events at their places and they are also interested in preparing radio programmes,” said Ms. Tete.
“When we started working on languages, we focused on five tribal and four regional languages. Then we realised that the bigger groups can take care of their own languages, but smaller communities need help,” said Ms .Tete.
[…]Youth from the community are also being encouraged to write poems in their language and older ones narrate their experience in their own language.[…]
The U.S. Federal Communications Commission (FCC) continues to cite businesses because digital signs are interfering with the wireless spectrum, creating problems with commercial and public wireless devices. This may occur because the signs are operating at Electro Magnetic Interference (EMI) levels not allowed under U.S. federal law and in violation of FCC regulations.
Click here for frequently asked questions to better understand these issues.[…]
Some people tend to shy away from using surface-mount components in their projects. It seems to be too difficult or needs an array of specialized equipment. In the past, I found myself in this same mindset — wary of using these types of parts. That all changed when I got involved with an open source motor controller project (OSMC).
It used a mix of surface-mount and through-hole components. I took the plunge and built up a pair of OSMC H-bridge boards and the MOB (Modular OSMC Brain) controller board which I used in the Battlebot Crash Test Junior.
At the time, there was little information available on how to mount these parts using an ordinary soldering station and tools that most hobbyists would have on hand. Not wanting to invest in a whole new set of tools (hot air stations, etc.), I experimented a bit and used common sense techniques to get the job done. A point I’d like to stress is the myth about requiring anything exotic to work with most surface-mount parts. I don’t own or use any special soldering equipment for this. All of the soldering that I’ve done on surface-mount boards is built with an old Weller WTCPT station and TC201 soldering iron. It has the fine tip that came standard on it. If you happen to have access to specialized tools, go ahead and use them but you still may find these tips helpful. It has been my experience that depending upon your techniques, you can get by just fine in most instances without specialized tools.[…]
I’ve been using an oscilloscope for almost 50 years. It’s my go-to measurement instrument in every electronics project I work on, helping me debug and fine-tune hardware and software projects.
In this article, I’ll show how you can get started with a simple-to-use scope you probably already have. Best of all, it’s free! When you graduate from this simple scope, you can purchase a more powerful scope using the exact same user interface.
Full disclosure: I love scopes so much, 10 years ago, I joined Teledyne LeCroy — the third largest scope manufacturer in the world behind Tektronix and Keysight. However, I use the Digilent Analog Discovery 2 Scope (described in this article) in all my hobby activities and in the workshops I teach at Tinkermill — our hackerspace in Longmont, CO.
I think the free scope control software, Waveforms, is the simplest to use, most feature-rich pro-level software of any of the available options. Using a sound card as the hardware interface with Waveforms puts a simple — yet powerful — scope in your hands for free.[…]
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Your support makes articles like this one possible. Thank you!
Many thanks to SWLing Post contributor, Dan Van Hoy (K7DAN), who shares the following comment in reply to our recent KGEI post. Dan writes:
It was my privilege to work at KGEI as a broadcast engineer and antenna rigger with FEBC from 1981-85. After that we went off to serve FEBC in Davao City in the Philippines. Never had any problems with the 50KW GE transmitter except one night when a driver tube failed. Nice to have a transmitter you could walk into! It was back on the air in about 45 min with a new tube. Mario Barahona was the main announcer most nights faithfully bring the Good News from the Voice of Friendship in Spanish.
I also painted the building tan with a dark brown trim while I was there. As I recall, I painted the KGEI name in dark brown too. The biggest project for me was helping install the TCI 16 folded dipole slewable array with reflecting screen stretched between two 365 ft tall towers. I was the only antenna rigger on the project.
The 250KW transmitter was primarily used for Russian broadcasts over the North Pole using the TCI antenna. The ERP was somewhere between 15-20 million watts depending on how the antenna was slewed. We were often heard loud and clear in a variety of home devices in nearby Foster City. I called the 250KW transmitter the worlds biggest Heathkit. It was ably maintained by an amazing radio engineer named Loch Gordon. Jack Brooks, WA6DBT, was the station manager. Hiley Rainer was the jack of all trades do it all engineer. It was one of the most enjoyable periods of my life.
Wow, Dan…I had no idea! Thank you for sharing those wonderful memories. I can’t imagine singlehandedly installing the antennas you did! I need to call you next time I have an antenna hanging party!
Photo: Jürgen Vogel / LandesMuseum Bonn via the Southgate ARC
(Source: Southgate ARC via Jake Brodsky, AB3A)
Not an everyday find: Archaeologists from the Rhineland Regional Council were amazed when they came across a Russian spy radio instead of Roman traces in the Hambach open-cast mine during excavations. Hidden in a large metal box.
“When the box was opened, it hissed,” Dr. Erich Claßen, head of the LVR Office for the Preservation of Archaeological Monuments in the Rhineland, told journalists. In the container: a Soviet radio type R-394KM, code name Strizh, a digital HF spy radio.
It was developed in the early 1980s in the Soviet Union (USSR) and used by the countries of the Warsaw Pact in the final phase of the Cold War. It was the last model before the fall of the Iron Curtain in 1989 and the collapse of the Soviet Union in 1992.
The device has a digital news system and a digital frequency display. It was used by agents abroad as well as by special units and was available with Russian or English text on the front. The spy version is known by the Russian code name “Strizh” (English: Swift).
In the LVR-Landesmuseum in Bonn there is currently not only the mysterious radio to see. Under the title “Gods, Graves and Agents”, spectacular finds from the year 2019 are on display until 29 March:
https://bodendenk
malpflege.lvr.de//de/aktuelles/veranstaltungen/AusstellungAiR2019.html
73
Tom DF5JL
1941: KGEI’s reinforced concrete transmitter building near Belmont. Built to withstand bomb or earthquake. (Source: TheRadioHistorian.org)
Many thanks to SWLing Post contributor, Tracy Wood (K7UO), for sharing the following article from The Daily Journal. Tracy’s notes follow this excerpt:
KGEI, a shortwave radio station in Redwood Shores that was the only voice from home for GIs in the Pacific during World War II, has its call letters back.
The letters on the front of the building located off Radio Road were covered up decades ago by a church that took over the station’s transmitter building, now part of Silicon Valley Clean Water.
“I am happy to report that we have uncovered the letters on the building,” said Teresa Herrera, manager of the wastewater treatment facility. “I think it looks great!”
Herrera said she had no idea of the building’s history until the Rear View Mirror brought it to SVCW’s attention. No extra money was needed for the restoration because the building was due to be painted.
“The letters were just as they were when the concrete forms had been originally removed in the 1930s,” said construction manager William Tanner.
Still, there is no plaque to remind the few visitors to the area that KGEI, the GEI standing for General Electric International, played an important role in World War II. Among other accomplishments, the station broadcast Gen. Douglas MacArthur’s “I have returned” speech that fulfilled his promise to return with victorious American troops to the Philippines, occupied by Japanese forces since 1942.
“The First 24 Hours of War in the Pacific,” a book written by Donald Young, underlines the importance of KGEI. It also reminds readers how successful Japanese forces were during those 24 hours in attacking Malaysia, Hong Kong, the Philippines, Wake Island and Guam, as well as Hawaii.[…]
Read the full article at The Daily Journal.
Tracy also shared the following notes:
During my youth I often listened to KGEI, both in Oregon and Bolivia. I got to visit the station in the 80s. I remember their teletype spewing paper for the long-form newscasts… The old 50kw GE hummed away.
The parasitic oscillations would actually form audio that you could hear in the studio/transmitter room. The 250 kw unit was tucked away… kind of hard to see.
KGEI was an important part of LATAM radio history.. the Cuban Missile Crisis, earthquake outreach to Nicaragua, etc.
Cheap clock radios could receive KGEI in Oregon when the 250kw unit was blasting to Asia.
“Mission Engineering” 250kw beamed to Asia on 5980 could often be heard with Chinese and Russian slow-dictation programming… trying to overcome the Cold War ban of Bibles in the Communist countries.
If you can find a copy of the book “Sky Waves” that has a complete history of FEBC and some more details about “La Voz de la Amistad,” the Voice of Friendship KGEI.
Thank you so much, Tracy, for your notes and insights!
I just found a copy of the 1963 book Sky Waves by Gleason H. Ledyard as a free download via the American Radio History website. Click here to download the PDF.
I imagine other SWLing Post readers remember KGEI as well. If so, please comment!