Category Archives: Radio History

Radio Waves: RIP Dame Vera Lynn, 1928 London Noises, Repoliticizing VOA, and Shortwave Trading At the Speed of Light

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Dame Vera Lynn (1917-2020)

Radio Waves:  Stories Making Waves in the World of Radio

Because 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’s Radio Waves, a collection of links to interesting stories making waves in the world of radio. Enjoy!

Many thanks to SWLing Post contributors Tracy Wood, Dennis Dura, David Goren, and Kim Elliott for the following tips:

Obituary: Dame Vera Lynn, a symbol of resilience and hope (BBC News)

Dame Vera Lynn, who has died at the age of 103, was Britain’s wartime Forces’ Sweetheart, and remained one of the country’s most potent symbols of resilience and hope.

With songs such as We’ll Meet Again and The White Cliffs of Dover, she inspired both troops abroad and civilians at home during World War Two.

As Britain’s cities came under attack, her wistful songs, with their messages of yearning and optimism, were heard in millions of British homes.

And 75 years later, the country turned to her once again as it faced another stern test.[…]

Click here to read our SWLing Post tribute to Dame Vera Lynn from 2015 which includes a recording made from my Scott Marine Model SLRM.

London street noises 1928 (Sound and History)

THERE ARE NO BBC radio recordings surviving from before 1931, so the job of representing the 1920s falls to this curiosity from the Columbia Graphophone Company. It’s a 12” 78rpm disc made in 1928 in association with the Daily Mail newspaper.

It seems likely that the disc was somehow tied in with a Daily Mail campaign over urban traffic noise. The commentator on both sides of the disc is a man named Commander Daniel and he doesn’t approve of everything he hears in the city streets.

The recordings were made from single, static locations in Leicester Square and Beauchamp Place on Tuesday 11th and Thursday 20th September respectively. Columbia probably used a recording van equipped with a disc-cutter.[…]

Repoliticizing Voice of America (The Hill)

When Michael Pack takes over as the first politically-appointed CEO of the U.S. Agency for Global Media, his first task will be to comprehend the bewildering array of international broadcasting entities under the USAGM. This includes two government agencies: Voice of America and Office of Cuba Broadcasting (Radio and TV Martí), and four government funded corporations: Radio Free Europe/Radio Liberty, Radio Free Asia, Middle East Broadcasting Networks (the Arabic-language Alhurra and Radio Sawa) and the anti-censorship Open Technology Fund. Within this structure are broadcasting outlets that straddle two entities, such as the Russian-language Current TV. All told, the entities distribute content in 61 languages.

When past that hurdle, Pack must then decide if he wants to maintain the journalistic independence of USAGM’s entities, or if he wants to move them towards advocacy of the administration’s policies.[…]

Companies Pitch Shortwave Radio to Shave Milliseconds Off Trades (Bloomberg)

High-frequency traders will famously do almost anything to get the latest market data and send their buy and sell orders a few milliseconds ahead of the competition. They blasted through mountains to build the most direct fiber-optic routes possible between exchanges in a competition that transformed global markets and was made famous by Michael Lewis’s book Flash Boys. Soon, pinging light through glass fiber at more than 124,000 miles per second wasn’t fast enough—the glass slows things down—so traders moved on to microwave transmitters that send signals through the air.

But that has problems, too. Microwaves travel only roughly as far as the eye can see before they peter out and need a signal boost. Now two rival market telecommunications companies have signed a pact that they say will give traders more access to experimental wireless signals which can travel across oceans.

To do that, signals need a longer wavelength—known as a shortwave rather than microwave—that bounces between the water and atmosphere. It’s an imperfect solution. The waves can handle only a fraction of the data that fiber can, carrying about a kilobit per second vs. gigabits. And some signals can be lost.

Raft Technologies Inc., a startup based in Tel Aviv, says the trade-offs are worth it. Raft says it can send data over shortwave from Chicago to Frankfurt in 31.4 milliseconds, which it says is about 4.5 milliseconds faster than the best available fiber route. That’s an eternity in an industry that tends to measure improvements by the thousandth of a millisecond. The company says the signal is about 85% reliable, compared with 100% for fiber. Clients can use a fiber line in parallel as a fail-safe measure.[…]

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Radio Waves: Radio Afghanistan, Postal Delays, KPH Video, and the Software Defined Radio Academy

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Radio Waves:  Stories Making Waves in the World of Radio

Because 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’s Radio Waves, a collection of links to interesting stories making waves in the world of radio. Enjoy!

Many thanks to SWLing Post contributors Heath Hall, Tom Daly, and Alexander (DL4NO) for the following tips:

For Decades, This Radio Station Named the Dead. Few Still Listen. (NY Times)

[Note: this article may require login to read at the NY Times]

Afghans once tuned into Radio Afghanistan twice a day to hear the reading of death notices. But in an age of social media, the voice of the nation has lost much of its sway.

KABUL, Afghanistan — Through decades of coups, invasions and endless war, Afghans tuned their radios to Radio Afghanistan every morning at 7 and every afternoon at 4:05 to hear the names of the newly dead.

One of the voices they often heard reading those death notices belongs to Mohamad Agha Zaki, at the mic for the state broadcaster for more than 42 years now. For much of that stretch, his counterpart at the station has been Ziauddin Aziz, the clerk who rushes to Mr. Zaki with the messages the public brings to the station’s small “Death Advertisements” window.

“Ads today?” Mr. Zaki, half asleep, asked on a recent dawn after opening the door to Mr. Aziz’s knock. Outside, birds chirped and the new day’s soft light covered the peaks of the tall pine trees in the station’s compound in Kabul, the capital.

No, said Mr. Aziz, who had waited behind the door in the kind of deference saved for masters of a different era. They had gone weeks without anyone arriving at the little window — just four ads in 40 days, though certainly many more had died.[…]

International Postal Service Disrupted (ARRL News)

The US Postal Service (USPS) has temporarily suspended international mail acceptance for items addressed to certain destinations due to service impacts related to the COVID-19 pandemic. This situation could result in the return or loss of mail, such as QSL cards, addressed to affected parts of the world. The USPS has posted a list of affected countries, which is updated regularly. The Postal Service will, upon request, refund postage and fees on mail bearing a customs stamp that’s returned due to the suspension of service, or the sender may re-mail returned items with existing postage once service has been restored. When re-mailing under this option, customers should cross out the markings “Mail Service Suspended — Return to Sender.”[…]

KPH Coastal Radio Station (Southgate ARC)

In this video Shannon Morse KM6FPP visits coastal radio station KPH which provided ship to shore communications using Morse code. Volunteers have preserved it and operate weekends

Watch The Last Active Morse Code Station in the US – KPH Radio Station

KPH http://www.radiomarine.org/
https://en.wikipedia.org/wiki/KPH_(radio_station)

More information about the Software Defined Radio Academy (Upper-Bavarian Bulletin)

Hamradio online

The Hamradio normally is the largest ham radio exhibition in Europe. But this year it cannot be held.

At the beginning of April, a team around the project manager Markus Heller, DL8RDS, started the project “Hamradio online”. This was only possible as DARC, the German hamradio society, started to introduce electronic collaboration tools long before Corona.

Within this virtual working environment a concept was developed of presentations, distinctions, and more. The program is being prerecorded and will partly be produced as live as possible. Especially the SDR Academy heavily depends on viewer feedback. There will also be videos from the Hamradio Convention that was held last March im Munich. These videos have not been published before.

The infrastructure is being maintained by the teams of the SDR Academy and “Facination Hamradio”. They produce the videos and streamline the installation so all action on the last weekend of June will happen smoothly. These transmissions will be transmitted through several Youtube cannels.

Obviously, personal meetings would be preferable. The advantage of this new solution are the possibly much more participants on both sides: audience and lecturers. The advantage is especially valid for the SDR Academy as most of it is done in English.

Nothing has been finalized. There is a preliminary program in German at https://www.darc.de/fileadmin/filemounts/gs/oeffentlichskeitsarbeit/Veranstaltungen/HAM_RADIO/HAMOnline_Sendeplan.pdf. Lectures held in English are announced in English. I hope an English version of the program will be created.

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Radio history videos are a serious benefit of Social Distancing!

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Many thanks to SWLing Post contributor, Bill Hemphill (WD9EQD), who shares the following guest post:

Benefits to Social Distancing

I have discovered that there is a positive side effect of social distancing.  With so many organizations using Zoom and other video methods for their meeting, the volume of great videos to watch has drastically increased, with most of it residing on YouTube.  Also everyone is sharing video links that they have found with other.

For example, the New Jersey Antique Radio Club (NJARC) has, for some time, posted their monthly meetings on their YouTube channel.  They have very enjoyable presentations.  Last night was their virtual monthly meeting for June and they had a great talk by Prof. Joe Jesson on “What You Did Not Know About the RCA AR88.”

I am a fairly new member to NJARC and must recommend them to others.  They are a very active group and are currently having Zoom conferences weekly between the members.  They also host the RADIO TECHNOLOGY MUSEUM at the InfoAge Technology Center.

Link to NJARC:

http://www.njarc.org/

Link to NJARC YouTube channel:

https://www.youtube.com/user/njarc/

Link to the Radio Technology Museum:

http://www.rtm.ar88.net/

Last week, I received an email from Mark  Erdle (AE2EA) referring to some videos by the Antique Wireless Museum which is hosted by the Antique Wireless Association (AWA).  From his email:

The Radios (and Filming) of “Across the Pacific”  presented by AWA member Brian Harrison.  Brian served as the radio consultant for the 3-hour PBS documentary “Across the Pacific”, which tells the story of the early days of Pan American Airways and of Hugo C. Leuteritz, a RCA radio engineer who helped make Pan Am’s expansion across the oceans possible with radio communication and navigation systems. Brian explains how he worked to insure that this documentary portrayed the pioneering work of Hugo Leuteritz as accurately as possible. Much of the early radio equipment that Pan American used was custom made for Pan Am, and is quite rare today, but Brian hunted it down.

 

In addition to Brian’s video, you can also see Tom Perera’s updated presentation of “Phil Weingarten’s Fabulous Fakes” which was originally presented at the 2007 AWA conference:

Link to AWA:  https://antiquewireless.org/homepage/

Link to AWA You-Tube Channel:  https://www.youtube.com/channel/UCX55peBhzeX1qps_VYXdLBA

Here are some other videos that people have passed along to me that I have found enjoyable.  Most of these are radio-oriented and I have omitted the many cat videos:

Thank you for sharing these links and videos, Bill! I’ve been watching Phil Weingarten’s Fabulous Fakes this morning–what a fascinating bit of history!

Post readers: Have you discovered videos and sites while social distancing (a.k.a. Social DXing)? Please comment and share your links!

Radio Waves: FEBC at 75 Years, Radio Drama “With a Twist”, Remembering Rufus Turner, and Free Foundation Online Training course

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Radio Waves:  Stories Making Waves in the World of Radio

Because 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’s Radio Waves, a collection of links to interesting stories making waves in the world of radio. Enjoy!

Many thanks to SWLing Post contributors Richard, Michael Bird, for the following tips:

Far East Broadcasting Celebrates 75 Years (Missions Box)

LA MIRADA, CA – Two students attending Southern California Bible College were given the vision to establish the Far East Broadcasting Company, which they incorporated in 1945.

Their initial broadcasting location was in Shanghai in the midst of the Chinese people whom the Lord had laid upon their hearts. The effort was short-lived, however, when China closed its doors to all missionary work in 1948.

Some people would have considered that to be the death of the vision. Not Bob Bowman, John Broger, or their supportive pastor, William Roberts. The vision remained the same, FEBC would have to find a different location.

On June 4, 1948, FEBC regenerated from station KZAS in Manila. By 1949, FEBC was equipped to air broadcasts from the Philippines, across the South China Sea, and into parts of China.

Now celebrating its 72nd year of continuous operations, Far East Broadcasting Company has expanded multiplied times and broadened its ministry to include AM, FM, shortwave, satellite, internet, and other digital technologies.[…]

Theaters Return To An Old Art Form — The Radio Drama — With A Twist (NPR)

As theaters across the world have closed because of the coronavirus pandemic, they’ve scrambled to find ways get work to the public.

Some have made archival video of productions available, some have created Zoom plays and some have returned to an old art form — radio drama — but with a digital twist.

In the 1930s, with many people out of work, families huddled around radio receivers to listen to audio plays, like Orson Welles’ famous broadcast, War of the Worlds.

“Orson Welles began his career as a theater actor and director,” says Adam Greenfield, artistic director for New York’s Playwrights Horizons. “And I think he’s able to really utilize the full potential of what audio can do.”

Taking cues from Welles’ success, Greenfield commissioned a new series of audio plays for podcast called Soundstage. He planned to release them this summer, when the theater was dark, but because of the pandemic he hustled them online.

The first podcast released was Prime: A Practical Breviary by songwriter and performer Heather Christian. It’s based on the 6:00 a.m. rite, or breviary, of solo contemplation for nuns and monks.[…]

Do you know Rufus Turner (Hackaday)

It is hard to be remembered in the electronics business. Edison gets a lot of credit, as does Westinghouse and Tesla. In the radio era, many people know Marconi and de Forest (although fewer remember them every year), but less know about Armstrong or Maxwell. In the solid-state age, we tend to remember people like Shockley (even though there were others) and maybe Esaki.

If you knew most or all of those names without looking them up, you are up on your electronics history. But do you know the name Rufus Turner?

W3LF

Turner was born on Christmas Day, 1907 in Houston, Texas. At the age of 15, he became fascinated by crystal diodes and published his first article about radio when he was 17. Rufus Turner was–among other things–the first black licensed radio operator (W3LF). He was building and operating radios in Washington D.C., where he was attending Armstrong Tech.

Turner became a licensed professional engineer in California and Massachusetts. You may have even used something that Turner worked on. In the 1940’s, working with Sylvania, he helped to develop the 1N34A germanium diode (you can still buy these if you look around for them).[…]

Register now for Free Foundation Online Training course (Southgate ARC)

The next free amateur radio Foundation Online training course run by volunteers from Essex Ham starts on Sunday, June 21

The Coronavirus outbreak and the RSGB’s introduction of online exams that can be taken at home has led to a surge in demand for free online amateur radio training courses such as that run by Essex Ham.

To cope with the high-demand from people wanting to get their amateur radio licence, the Essex Ham Team have been running an additional online training course each month. The next course starts on June 21.

You can find out more about online training and register to join a course at
https://www.essexham.co.uk/train/foundation-online/

Essex Ham
https://www.essexham.co.uk/
https://twitter.com/EssexHam

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Radio Waves: Free Foundation License Course, More Titanic Radio, CQD, and ARRL Field Day Waivers

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Radio Waves:  Stories Making Waves in the World of Radio

Because 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’s Radio Waves, a collection of links to interesting stories making waves in the world of radio. Enjoy!

Many thanks to SWLing Post contributors Trevor, Mark Hirst and Ulis Fleming for the following tips:

Register now for free Amateur Radio Foundation Online training course (Southgate ARC)

The next free amateur radio Foundation Online training course run by volunteers from Essex Ham starts on Sunday, June 7

The Coronavirus outbreak and the RSGB’s introduction of online exams that can be taken at home has led to a surge in demand for free online amateur radio training courses such as that run by Essex Ham.

These courses have been very popular and early registration is advised. 313 people took the course that started on May 3 and a further 235 are on the course that started on May 17.

You can find out more about online training and register to join a course at
https://www.essexham.co.uk/train/foundation-online/

Essex Ham
https://www.essexham.co.uk/
https://twitter.com/EssexHam

US court grants permission to recover Marconi telegraph from Titanic wreckage (ARS Technica)

But NOAA is fiercely opposed to the controversial salvage mission.

When RMS Titanic struck an iceberg on April 14, 1912, crew members sent out numerous distress signals to any other ships in the vicinity using what was then a relatively new technology: a Marconi wireless telegraph system. More than 1,500 passengers and crew perished when the ship sank a few hours later. Now, in what is likely to be a controversial decision, a federal judge has approved a salvage operation to retrieve the telegraph from the deteriorating wreckage, The Boston Globe has reported.

Lawyers for the company RMS Titanic Inc.—which owns more than 5,000 artifacts salvaged from the wreck—filed a request in US District Court in Alexandria, Virginia, arguing that the wireless telegraph should be salvaged because the ship’s remains are likely to collapse sometime in the next several years, rendering “the world’s most famous radio” inaccessible. US District Judge Rebecca Beach Smith concurred in her ruling, noting that salvaging the telegraph “will contribute to the legacy left by the indelible loss of the Titanic, those who survived, and those who gave their lives in the sinking.”

However, the National Oceanic and Atmospheric Administration (NOAA) is fiercely opposed to the salvage mission. The agency argues in court documents that the telegraph should be left undisturbed, since it is likely to be surrounded “by the mortal remains of more than 1500 people.” Judge Smith countered in her decision that the proposed expedition meets international requirements: for instance, it is justified on scientific and cultural grounds and has taken into account any potential damage to the wreck.[…]

Why Titanic’s first call for help wasn’t an SOS signal (National Geographic)

When RMS Titanic set sail in 1912, it was blessed and cursed with the latest in communication technology—the wireless telegraph. In the last hours after Titanic hit an iceberg, radio messages sent from the storied sinking ship summoned a rescue vessel that saved hundreds of people, but also sowed confusion with competing distress calls and signal interference. More than 1,500 people died that fateful night.

Now, a recent court ruling may pave the way to the recovery of Titanic’s telegraph, designed by Guglielmo Marconi, a telecommunications pioneer and 1909 Nobel Prize winner in physics who invented the first device to facilitate wireless communications using radio waves.

[…]Despite the limitations of the Marconi telegraph—and the fact that it wasn’t intended to be used as an emergency device—Titanic was outfitted with a radio room and a Marconi-leased telegraph machine. Two young Marconi-employed operators, chief telegraphist Jack Phillips and his assistant Harold Bride, sent Morse code “Marconigrams” on behalf of Titanic’s well-heeled customers 24 hours a day during its maiden voyage in April 1912.

Both Marconi’s technology monopoly and the torrent of personal messages conveyed through Titanic’s telegraph proved fatal on that April night. Phillips was so overwhelmed by a queue of incoming and outgoing guest telegrams —one Titanic passenger wanted to “notify all interested” about an upcoming poker game in Los Angeles—that he didn’t pass on messages about the ice threatening Titanic’s ocean environs. When a nearby vessel, SS Californian, telegraphed that it was already surrounded by ice, Phillips testily responded “Shut up! I am busy.”

Once Titanic hit the iceberg, Phillips tone shifted and he used the Marconi distress signal: “CQD.”[…]

Temporary Rule Waivers Announced for 2020 ARRL Field Day (ARRL News)

With one month to go before 2020 ARRL Field Day, June 27 – 28, the ARRL Programs and Services Committee (PSC) has adopted two temporary rule waivers for the event:

1)      For Field Day 2020 only, Class D stations may work all other Field Day stations, including other Class D stations, for points.

Field Day rule 4.6 defines Class D stations as “Home stations,” including stations operating from permanent or licensed station locations using commercial power. Class D stations ordinarily may only count contacts made with Class A, B, C, E, and F Field Day stations, but the temporary rule waiver for 2020 allows Class D stations to count contacts with other Class D stations for QSO credit.

2)      In addition, for 2020 only, an aggregate club score will be published, which will be the sum of all individual entries indicating a specific club (similar to the aggregate score totals used in ARRL affiliated club competitions).

Ordinarily, club names are only published in the results for Class A and Class F entries, but the temporary rule waiver for 2020 allows participants from any Class to optionally include a single club name with their submitted results following Field Day.

For example, if Podunk Hollow Radio Club members Becky, W1BXY, and Hiram, W1AW, both participate in 2020 Field Day — Hiram from his Class D home station, and Becky from her Class C mobile station — both can include the radio club’s name when reporting their individual results. The published results listing will include individual scores for Hiram and Becky, plus a combined score for all entries identified as Podunk Hollow Radio Club.

The temporary rule waivers were adopted by the PSC on May 27, 2020.

ARRL Field Day is one of the biggest events on the amateur radio calendar, with over 36,000 participants in 2019, including entries from 3,113 radio clubs and emergency operations centers. In most years, Field Day is also the largest annual demonstration of ham radio, because many radio clubs organize their participation in public places such as parks and schools.

Due to the COVID-19 pandemic, many radio clubs have made decisions to cancel their group participation in ARRL Field Day this year due to public health recommendations and/or requirements, or to significantly modify their participation for safe social distancing practices. The temporary rule waivers allow greater flexibility in recognizing the value of individual and club participation regardless of entry class.

ARRL is contacting logging program developers about the temporary rule waivers so developers can release updated versions of their software prior to Field Day weekend. Participants are reminded that the preferred method of submitting entries after Field Day is via the web applet. The ARRL Field Day rules include instructions for submitting entries after the event. Entries must be submitted or postmarked by Tuesday, July 28, 2020.

The ARRL Field Day web page includes a series of articles with ideas and advice for adapting participation this year.[…]

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Radio Waves: ABC Wage Freeze, A Titanic Radio, FCC “Tweaks” LPFM Rules, and Digitizing a DX-160 Display

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Radio Waves:  Stories Making Waves in the World of Radio

Because 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’s Radio Waves, a collection of links to interesting stories making waves in the world of radio. Enjoy!

Many thanks to SWLing Post contributors Michael Bird, Dave Zantow, David Korchin, and Alokesh Gupta for the following tips:

ABC must freeze wages, government warns (The Guardian)

The Morrison government has put the national broadcaster on notice that it expects the ABC to embark on a six-month wage freeze to bring it in line with other taxpayer-funded agencies during the Covid-19 crisis.

The warning follows the government’s decision in early April to defer general wage increases for commonwealth public servants for six months. The public service commissioner followed up that directive by writing to all non-public service agencies – including the ABC – informing them the government expected them to adopt the same practice.

With no clear response from the ABC to the 9 April missive, Guardian Australia understands the communications minister Paul Fletcher wrote to the national broadcaster this week flagging his expectation that the organisation would defer a 2% increase for all employees scheduled to take effect in October under the ABC’s enterprise agreement.[…]

Radio used by the Titanic to call for help can be salvaged, judge rules (CNN)

A federal judge has ruled that RMS Titanic Inc. can salvage the radio used to call for help by the fated ocean liner after it struck an iceberg in 1912.

To get to the radio, divers would need to remove a part of the ship’s deckhand to reach the room known as the Marconi Suite, which houses the device.

The ruling modified an order issued on July 28, 2000, that said that RMS Titanic Inc. could not cut into the wreckage or detach any part of it.

Virginia’s eastern district court amended that order “for a unique opportunity to recover an artifact that will contribute to the legacy left by the indelible loss of the Titanic, those who survived and those who gave their lives in the sinking,” Judge Rebecca Beach Smith wrote.

Experts in the case testified to the “significant deterioration” in areas above and around the Marconi room, according to the document, and photos showed the “increasing breakdown” in the deck above the suite.

The suite, made of steel, consisted of three areas: sleeping accommodations, an operator’s room and the silent room that housed the radio. Each area was separated by wood walls that officials believe have dissolved, according to court documents.

The Marconi device and the artifacts associated with it face “significant threat of permanent loss,” the judge said in her approval of the expedition.[…]

FCC Tweaks LPFM Technical Rules (Radio World)

The FCC in April modified the technical rules covering low-power FM stations. It expanded the permissible use of directional antennas; permitted waivers of protections of television Channel 6 by a specific group of reserved channel stations; expanded the definition of minor change applications for LPFM stations; and allowed LPFM stations to own boosters. Read more about the changes here.

Michelle Bradley, founder of REC Networks, is an engineer and longtime LPFM advocate.

Radio World: What’s your overall assessment of the outcome and the scope of its impact in the LPFM community?

Michelle Bradley: While the FCC did not address three major issues that are impacting LPFM stations right now —the ability to address building penetration issues, the ability to reach “local” listeners in rural areas and the disparity in how LPFM stations protect FM translators vs. how translators protect LPFMs — the changes will benefit current LPFM stations by giving them more flexibility in moving locations, reduce the need for waivers and improve LPFM service in the southern border region. It will also open some additional opportunities for new LPFM stations in the next filing window.[…]

RadioShack Shortwave Goes Digital (Hackaday)

If you spent the 1970s obsessively browsing through the Radio Shack catalog, you probably remember the DX-160 shortwave receiver. You might have even had one. The radio looked suspiciously like the less expensive Eico of the same era, but it had that amazing-looking bandspread dial, instead of the Eico’s uncalibrated single turn knob number 1 to 10. Finding an exact frequency was an artful process of using both knobs, but [Frank] decided to refit his with a digital frequency display.

Even if you don’t have a DX-160, the techniques [Frank]  uses are pretty applicable to old receivers like this. In this case, the radio is a single conversion superhet with a variable frequency oscillator (VFO), so you need only read that frequency and then add or subtract the IF before display. If you can find a place to tap the VFO without perturbing it too much, you should be able to pull the same stunt.

In this receiver’s heyday, this would have been a formidable project. Today, a cheap digital display will do fine.[…]

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