Category Archives: Shortwave Radio

How to replace a noisy wall power supply

JamecoWallPowerSupplyRegarding noisy switching power supplies, SWLing Post reader, Dan Lewis, comments:

“Google the following: “Jameco linear wall transformer”, and you’ll find a suitable non-switching replacement.

Jameco still has a number of linear transformers in their catalog at reasonable prices. I haven’t bought anything from them in many years but when I dealt with them frequently a number of years back they were always reputable.”

Many thanks for your suggestion, Dan! Jameco is a reliable company and I’ve also been a long-time customer. If you know how to pick the proper power supply for your radio (or any other electronic device) click here to view a list of regulated linear supplies on Jameco’s website. [Also note this follow-up post.]Otherwise, keep reading…

How to find a replacement AC adapter/power supply

When you purchase a replacement power supply, you must make sure that several properties match that of the device it will power, else you could cause damage.

There are four properties you need to match: voltage, rated current, polarity and tip size.

Voltage

Most consumer electronics are powered by and rated for 4.5, 5, 9, 12, or 13.8 volts DC. Of course, there are exceptions. It is important that you match the required voltage exactly. Most radios and electronic devices display their required voltage and voltage tolerance on the unit itself, on the supplied switching power supply, and/or in the owner’s manual.

Rated Current

Like voltage, rated current is usually displayed somewhere on the device, existing power supply or in the owner’s manual. Current is usually indicated in amps (A) or milliamps (mA). Unlike voltage, rated current on your power supply does not have to match the device exactly. You simply need to make sure the power supply meets or exceeds your radio’s required current.

For example, if your radio requires 800 mA (or .8 A) and you find a power supply rated for 500 mA, you should not use it. If you find a power supply rated for 2 amps (or 2000 mA), it exceeds the 800 mA rating, so you’re good to go!

Unlike voltage, your electronic device or radio will only draw the amount of current it needs from the power supply.

Polarity

Click here to read more about tip polarity. (Source: WikiPedia)

Click here to read more about tip polarity. (Source: WikiPedia)

You’ll need to determine if your radio requires a plug with a positive or negative tip (a.k.a. center conductor).

Fortunately, manufacturers have long used standard symbols to make polarity obvious (see image).

You’ll typically find a polarity symbol printed on the back of your radio, near the plug-in point, in the owner’s manual or on the back of the existing wall adapter.

Note: Be very careful matching polarity! Some radios and electronic devices are not properly protected against reverse polarity; damaged can occur immediately after supplying voltage with incorrect polarity.

TJamecoWallPowerSupplyip/plug size

You need to make sure that the inner diameter and outer diameter of a replacement wall adapter will match that of your existing adapter.

This can be the most difficult property to match.

Occasionally, radio manufacturers will actually specify the tip size in their owner’s manual, spec sheets, or on the product page of their website. I’ve even had luck calling manufacturers and asking a technician for the plug size.

ACAdapterTip

Specification sheets will typically indicate plug dimensions with an illustration.

Otherwise, you can always measure the existing power supply tip (both inner and outer dimensions) using calipers.

Once you have those dimensions, finding the appropriate replacement power supply is quite easy. Indeed, companies like Jameco provide specification sheets (click here for an example) that indicate dimensions for each power supply they sell.

Once you’ve matched the voltage, rated current, polarity and tip size, you can purchase a regulated linear power supply with confidence!

Keep in mind: there are most likely other devices in your home with noisy switching power supplies that could be causing radio interference. Check out my noise trouble shooting section of this article to help identify local sources of radio noise.

Update: check out this follow-up post regarding Jameco power supplies–not all are truly linear regulated.

Photos from the VOA Bethany Museum

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Immediately after packing up our table at the Dayton Hamvention, my buddies Eric (WD8RIF), Miles (KD8KNC), and I made the 30 minute journey to Bethany, Ohio, to visit the VOA Bethany museum.

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Main entrance and front lobby (above).VOA-Bethany- - 1 (34) VOA-Bethany- - 1 (3)

Entering the transmitter control room.

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VOA-Bethany- - 1 (28)Eric pointed out an article on the future of shortwave radio I published last year that the museum has posted in the hallway next to the control room (above).  What an honor!

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The antenna switching array behind the main building (following four photos).

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WLW (700 kHz) 800′ tower in the distance (above).

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The satellite dish (above) was once used for VOA’s downlink/feed–now the West Chester Amateur Radio Association (WC8VOA) uses the dish for EME (Earth Moon Earth) contacts.

VOA-Bethany- - 1 (32)Back inside, WC8VOA has four full amateur radio operating locations stocked with Icom, Yaesu and Kenwood gear. The club president told us that an antique amateur radio station will soon be added.

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Our docent took us on a tour of two vaults filled with vintage radio equipment and then a museum devoted to the legacy of WLW. The item in the photo above is a corona ball from one of the original towers–notice the holes from lightning strikes.

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Example of an early radio kit (above).

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A rare Third Reich radio (above).

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When Ohio-based R.L. Drake Company stopped manufacturing amateur radio equipment, samples of their full product line were donated to the museum.

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The Museum is planning substantial renovations to restore the VOA Bethany Station and become a first class institution. During the restoration, the Museum is only open one day per month to the public: The third Saturday of each month from 1:00 PM – 4:00.

Click here to view the museum’s new website.

Photos from the 2015 Dayton Hamvention Flea Market

Weather yesterday morning at the Dayton Hamvention was quite pleasant even if a little fickle at times. I had time in the morning and an hour or so in the afternoon to browse the various treasures scattered about in the flea market section. Here are a few photos of the vintage gear I found:

IMG_20150515_155324563_HDR-001 IMG_20150515_155434678_HDR-001 IMG_20150515_155443439 IMG_20150515_155448977_HDR IMG_20150515_155454414_HDR Zenith-Transoceanics RCA RCA-Dial HRO Zenith-Transoceanic-7000 BC-348 Sky-Buddy IMG_20150515_080420028 IMG_20150515_080728372 IMG_20150515_083338068_HDR IMG_20150515_084608184_HDR IMG_20150515_084618551_HDR IMG_20150515_084624951_HDR IMG_20150515_084715842_HDR IMG_20150515_090737380 IMG_20150515_091306152 IMG_20150515_092249982_HDR IMG_20150515_092652251_HDR IMG_20150515_093056292_HDR IMG_20150515_093106560_HDR IMG_20150515_093155333_HDR IMG_20150515_093210149_HDR IMG_20150515_093216094 IMG_20150515_094335853 IMG_20150515_094524046_HDR IMG_20150515_133437879

My friend and ETOW volunteer, Christine, purchased the mint condition Zenith Transoceanic above. I’m not sure I’ve ever seen a better example of a vintage Transoceanic 7000 for sale. A good bit of well-deserved beginner’s luck for Christine!

If you’re also at the Dayton Hamvention, please stop by table 411 in the Ball Arena and introduce yourself!

Jeff Murray presents: Love, Death & Shortwave

SINPO-Pictures

From my buddy, Jeff Murray (K1NSS), the Mastermind behind Dashtoons:

“Created for the North American Shortwave Association’s Winterfest 2015, this unflinching documentary recalls a time when tuning a short wave radio was something akin to enjoying a schnapps in a cool West Berlin jazz bar less than a klick from Checkpoint Charley, especially if you were eleven years old.”

https://www.youtube.com/watch?t=97&v=RkcR7_esRcE

ERT reopens under direction of Dionysis Tsaknis

(Photo source: AP / Petros Giannakouris)

(Photo source: AP / Petros Giannakouris)

SWLing Post contributor, Ayar, confirms that ERT employees did indeed returned to work yesterday after having been laid off nearly two years ago. Ayar shares this link to GreekReporter.com which has full details.

A recap of the 2015 Winter SWL Fest

The following article originally appeared in the April 2015 issue of The Spectrum Monitor magazine.


DavidGoren-ShortwaveShindig

David Goren prepares musicians and voice talent as the Shortwave Shindig goes live on WRMI

Every year, I attend two great radio conventions: the Dayton Hamvention and the Winter SWL Fest. While the Dayton Hamvention draws a massive crowd of ham radio operators, vendors, and makers from across the planet–and it’s truly a fun and fantastic event–the smaller Winter SWL Fest is actually my fave of the two.

Any why is this? A re-cap of the 2015 Winter SWL Fest might provide some clues.

The Winter SWL Fest is organized and sponsored by the North American Shortwave Association (NASWA) and each year draws well over 100 radio enthusiasts to Plymouth Meeting, Pennsylvania. While it is a shortwave radio festival––with its roots firmly in the shortwave medium––it’s certainly not limited to the HF bands only; in fact, here’s a list of some of the forums from 2015, and their subject breadth is remarkable:

  • Radio on the Road 3. Janice Laws shared radio recordings and videos from her various travels across the planet, showcasing the local flavor found on the FM and AM dials.
  • The Year in Pirate Radio. George Zeller once again hosted the shortwave pirate radio forum, covering the year in pirate radio, and announcing inductees into the PIrate Radio Hall of Fame.
  • Time Travel, Teleportation, and Spectrum Hoarding for the Contemporary DXer. My good friend Mark Fahey and I co-hosted this forum. In this forum we discussed our obsession with collecting and sharing spectrum recordings, highlighting the added context spectrum playback provides that traditional broadcast recordings cannot. We brought along several terabytes of spectrum recordings from my home in North Carolina and from Mark’s home near Sydney, Australia, to share with this forum’s attendees.
  • Coast to Coast: Geographically Enhanced Mediumwave Reception. Bill Whitacre shared what he has learned from mediumwave DXpeditions to Grayland, WA, and Lubec, ME, over the past 5 years. Bill focused on the advantages of carefully-selected geographic locations for the best DX opportunities.
  • Ultralight Mediumwave DXing. Gary Donnelly hosted a forum which touted the virtues of the most simple radios and receivers and the immense fun that can be had from them. Gary discussed some amazing reception records obtained with these pocket-sized “ultralight” (and ultra cheap!) receivers.
  • Crisis Radio. Michael Pool (a.k.a., “The Radio Professor”) focused on radio as it sounds locally during crises. He shared recordings and airchecks he had captured during natural disasters, terrorist attacks, and moments of civil unrest. Through these recordings, and with the advantage of some emotional distance, attendees could form their own opinions as to how the media handled each event.
  • Radio and Today’s Teenagers. Anthony Messina (age 18) focused his forum on the way teens view radio today, taking into account the medium’s ongoing evolution. Anthony also discussed how he got interested in shortwave radio and DX’ing in the age of internet and smartphones––a remarkably fascinating (and familiar) journey.
  • Kickin’ It Old School: A Return to Regenerative Receivers. In this forum, Skip Arey proposed that a radio design, at the very roots of RF Technology, is experiencing a resurgence: regenerative receivers. He discussed the classic regen circuit and how to use it to bring a new dimension to shortwave listening.
  • The View from Europe. Finn DXer Risto Vahakainu, who travels to the Winter SWL Fest with a contingent of Finnish DXers, reported on the state of the radio hobby in Europe and specifically in Finland. He focused upon the impact of SDRs and also described remote DX sites one can rent for one’s own DXpedition in northern Finland.
  • “UFOs, Gliders and Planes, Oh My!” Tom Swisher––noted member of the SWL Fest so-called “scanner scum”––covered the wide array of frequencies that can be monitored with “your trusty old scanner” after local law enforcement goes digital.
  • Monitoring Dusty War Zones and Tropical Paradises: On Being a Broadcast Anthropologist. Mark Fahey––who travelled from Australia to attend the Winter SWL Fest for the second year in a row––presented a tour of his monitoring station (i.e., his house). We saw how Mark combines several satellite, internet, and SDR feeds from across the globe to create a custom video and audio listening post with feeds. Mark, who is also an avid traveler, shared some of his highly original, out-of-the-box ways of collecting rare radio DX.
  • The Keeping of Time. In this forum, Mark Phillips discussed the importance of accurate time-keeping as our hobby moves toward the digital realm. Mark explained the difference between time sources, why they are different, and why accurate time is so important.
  • Recognizing Digital HF Signals: Eyes and Ears. TSM contributor Michael Chace-Ortiz taught that simply with one’s eyes and ears, it’s possible to identify a number of the digital modes and anomalies on our HF bands. Mike gave an interactive audio-visual tour of numerous modem signals, Over-The-Horizon RADARs, ionospheric sounders, ocean sensing systems, and various other digital oddities that can be heard today.

In short: what a dynamic––and diverse––forum line-up!

Of course, for the second year in a row, David Goren’s annual Shortwave Shindig was broadcast live from the Fest via WRMI. It was great fun receiving live reports from listeners across the globe.

I’m sure some twenty-eight years ago when the first SWL Fest was held, forum topics all centered around the shortwave radio hobby fairly exclusively. But today, how we define radio has changed, and the shortwave radio is no longer the only way to glean accessible content from across the globe. Most of the SWL Fest attendees and hosts, however, maintain and cultivate the spirit of DXing: finding innumerable paths into an ocean of diverse broadcasting. I was happy to be a part of the shortwave radio-related forums that centered on the use of software-defined radios, no doubt a revolutionary game-changer in our listening hobby, and a technology I actively explore (see my review of the TitanSDR next month).

While the 2015 line-up was diverse and drew on the expertise of some of the most noted enthusiasts in our field, this experience is actually what I’ve come to expect from the SWL Fest. So many amazing projects, including a Sundance award-winning film (!), have played a part in making the Fest what it is today.

I encourage you to keep tabs on the Winter SWL Fest and make plans to attend in 2016. Details will be posted on the Winter SWL Fest website: https://swling.com/blog. One thing is for sure: if the crazy winter weather conditions this year didn’t stop me from driving several hundred miles through snow and ice to the Fest, nothing is going to stop me next year! Hope to see you there.

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A parting note

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Martin Peck with the New Westchester Symphony Orchestra (Photo credit: Stephy Kollarackal)

As you may imagine, since the SWL Fest has been ongoing for many years, strong bonds have formed among Fest attendees––indeed, the group has become like an extended family. This year, we learned during the annual Saturday night banquet that we had just lost one of our Fest family, one Martin Peck, following a battle with esophageal cancer. Marty, as we all knew him, was an incredibly kind fellow, well-loved and warmly regarded at the Fest. He was not only an avid SWL, but a talented musician, and a member of the New Westchester Symphony Orchestra. Marty could play some of the most obscure interval signals on demand with practically any wind instrument. He found a welcome home at David Goren’s Shortwave Shindig.

Marty, pal, we’re going to miss you.

Listener Post: Greg Blair

SP600Dial3Greg Blair’s radio story is the latest in our series called Listener Posts, where I place all of your personal radio histories.

If you would like to add your story to the mix, simply send your story by email!

In the meantime, many thanks to Greg Blair who originally posted the following on the Shortwave Listeners Worldwide Facebook group.  Greg writes:


How I Discovered Shortwave Radio

BoysBookOfRadioI discovered shortwave radio almost by accident.

I had built a simple crystal radio from plans in a library book…(I think it was “The Boy’s Book of Radio” or similar. ) I added a one transistor amplifier later. I had a really great long wire antenna from the garage to the house, up about 30 feet, about 75 feet long, and a good earth ground.

I was playing around with it, and I had an old phonograph amplifier I connected to the output of it. I de-tuned the coil and apparently managed to get it tuned into the 49 meter band. All of a sudden I was hearing broadcasters from Europe. Some were in English, others in foreign languages.CrystalRadio

Up to that point I had thought that all radio was like AM broadcast, only good for a few hundred miles even at night. I was flabbergasted. That marked the beginning of my addiction to radio. I have never gotten over the miracle of HF radio ever since.


Many thanks, Greg, for sharing your memories with us!

I can only imagine the thrill is must have been to tune in stations from across the planet on your simple, home-brew radio set.

I encourage other SWLing Post readers and contributors to submit their own listener post!  Tell us how you became interested in radio!