Author Archives: Thomas

April shares her collection of Japanese language WebSDR recordings

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Many thanks to SWLing Post contributor, April TimeLady, who writes:

To aid in my knowledge of the Japanese language I have been using SDRs and recording what I hear.

I have uploaded a collection of recordings of Japanese audio made from various SDRs, primarily those located in Japan itself. Those with 6105 kHz in the title were generally made off of American SDRs. Occasionally there will be some European and African off air recordings in there. These are in .ogg format.

https://archive.org/details/JapaneseSDRrecordingsApril2020


Thank you for sharing your recordings with the world, April!

Example of a manual wavechange at BBC Skelton A Transmitter

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By Michael Whitfield, CC BY-SA 2.0

Many thanks to SWLing Post contributor, Dave Porter (G4OYX), who shares the following:

Here’s Steve Gale in the late 80’s or early 90’s starting a wavechange on a Marconi BD272 250 kW sender at SKA.

There were eventually 11 of these senders at the BBC Skelton A site.

The first pic is the Final RF amplifier output stage with the 15/17 MHz coil being in situ. It sits between the two anodes of the output tubes.

Below the anode coil sits the coupling coil and it is on a motorised deck, that can be moved backwards and forwards on power to couple up to the required power output.

Steve is just starting the band change as he is wearing the leather gauntlets because after a transmission the coils are very hot.

Both the anode and coupling coils will be removed and replaced by those for the next required frequency.

A fifteen minute period was allocated by the BBC WS Schedule Department to accomplish a band change though two of us could do them in about eight minutes if pushed!

The picture below shows Steve starting to remove one of the pair of the 3-turn 40 kW Penultimate stage to Final stage coupling coils, again he is wearing the gauntlets. A different coil will be used for the next band.

The three turn coil covered 9, 11 and 15 MHz.

All those senders have gone now at Skelton.

Two are still in use at Woofferton and some in Singapore.

Thanks so much for sharing this glimpse into a working shortwave radio transmitting station, Dave! There’s nothing QRP about those transmitters and I bet those coils got incredibly hot!

Radio Waves: Clandestines, FCC’s New Logo, WNYC Vision, and RAC Membership Renewal Procedures

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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 Ron, Andrea Borgnino, and Tracy Wood for the following tips:

Clandestine: Under false flags (Nils Schiffhauer – DK8OK)

Non-official radio stations always attracted shortwave listeners who call them “clandestines”, follwing a mixture of mis-understanding and romanticism. The range of this class of stations is remarkably wide. Nowadays, the majority of them is renting time from major transmission centres like Nauen/Germany, Issoudun/France or Toshkent/Uzbekistan.

As all media, they are put into service to influence people and to sell something by propaganda. The difference between an official broadcaster, like Voice of America, and a “clandestine” like North Korea Reform Radio is not palpable – both are financed by the U.S. Congress.

With most broadcasters transmitting on a scale between facts (“white” – nearly only the BBC) and sheer disinformation (“black”), clandestines are placed on the darker third of this range. The separation between “clandestine” and “official” is rather artificial. There simply is no difference between e.g. the official World Harvest Radio and the clandestine Voice of Wilderness, both religious brodcasters, funded by Cornerstone Ministries International/USA – to take just two religious stations.

Today’s activity of clandestines is concentrated on Africa and Asia with especially taking countries like North Korea, China, Eritrea and Sudan into focus.[…]

FCC Adopts a New Official Seal in Anticipation of Relocation (ARRL News)

In anticipation of its upcoming move, the FCC has adopted a new FCC seal. The redesigned seal is the product of an agency-wide contest that solicited proposals from employees and contractors. The winning design, submitted by Umasankar Arumugam, was selected by a vote of the agency’s employees and contractors.

The revised design incorporates several elements: communications technologies currently transforming our world; four stars on the outer seal border, drawing from the legacy of the predecessor Federal Radio Commission seal; 18 stars on the shield, recognizing the current number of bureaus and offices; and the eagle and shield, identifying the FCC as a federal government agency.[…]

1937 Vision: WNYC, The Flagship Station of a Non-Commercial Cultural Network (WNYC)

The notion of WNYC becoming the flagship station of a non-commercial network of cultural stations was first publicly articulated by Mayor La Guardia at the launching of the station’s new WPA-built transmitter facility in Greenpoint, Brooklyn on October 31, 1937. La Guardia envisioned a non-commercial/educational radio network connected via shortwave rather than expensive landlines leased by AT&T, but the FCC prohibited interstation communication by means other than wire when wire is available. At the ceremony La Guardia sharply criticized the FCC prohibition: “That is just as nonsensical and as unreasonable as to say that one isn’t permitted to fly from here to Chicago because there are railroads going from here to Chicago. Of course, all this is very good for the New York Telephone Company, but it is not so hot for us.”[…]

New RAC membership renewal procedures (RAC via Southgate ARC)

On behalf of Radio Amateurs of Canada, I would like to thank you for your continued support of Amateur Radio in Canada and internationally.

Your membership has helped RAC in its two primary objectives: to support and promote Amateur Radio in Canada and internationally; and to provide valuable programs and services to RAC members (see below).

As a result of the COVID-19 global pandemic, the RAC Head Office in Ottawa has been closed temporarily and we are no longer able to send out membership renewal notices by mail and we will be sending out email notices instead.

We would appreciate it if you would please watch for these messages in your inbox and also in your junk folders – this is especially true if you have Outlook or Hotmail email addresses.

In addition, you can assist us by checking to see when your membership will expire by logging on to the RAC website and going to the “My Membership” webpage (https://www.rac.ca/my-membership/). You can also find it on the mailing label of the paper version of The Canadian Amateur magazine or by calling the RAC office as described below.

If you need to renew your membership you can do so by using one of the following options:

  • Online:  by completing the online renewal form (or by clicking on the “Join Radio Amateurs of Canada” logo on the top right of the RAC website). Payments must be made by credit card or by PayPal.
  • By phone:  by calling 877-273-8304 from 10 am to 4 pm EST/EDT, Monday through Friday (except statutory holidays). You may pay by credit card or you may send a cheque for the appropriate amount to the RAC head office.
  • By mail:  if you prefer to have your renewal form processed via standard mail, you can download an application for your region from the Membership Renewals webpage and mail it to the RAC Office.

73, Glenn MacDonell, VE3XRA
RAC President

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Patrizio’s simple homebrew NCPL antenna

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Many thanks to SWLing Post contributor, Patrizio Cardelli, who writes:

I’m Patrizio (SWL I – 5184 /AN) from Riva del Garda, Italy.

A few days ago, I built a Noise-Cancelling Passive Loop (NCPL) antenna. I built the 1:1 balun with a couple of ferrite 175 – 285.

I got a good result on medium wave on my ICOM IC R 71 E with the antenna inside my house installed behind the desk just to avoid any problems with my wife.

On shortwave, the signal was low in comparison with the Bonito mini whip but in my QTH I have a lot of QRM and with this antenna I solved my problem.

Yesterday I tried the balun with my random wire (15,2 meter long) also with good results.

About my NCPL antenna: I made mine with RG-58 coaxial cable just to have easy portability in SOTA (please see photo) and also the feed line is made by the same coaxial cable. OK, you are right…it’s ugly:

Electrical connections are not soldered, still I don’t see any mechanical issues and this antenna since it is made for SWL / BCL purposes (meaning, RX only, no TX).

Concerning the binocular ferrite core, I didn’t have one, so I used two ferrite core type 175 – 285 (28,5 mm length, external diameter 17,5 mm and internal diameter 9,5 mm) normally used to reduce HF interference:

For the winding I used PVC insulated cable cat no: 7/0,2 type 2 (def61 – 12) conductor 7/0,2mm TSCu X 0,3mm R/T type single (4 turns primary and 4 turns secondary). It’s the same cable with which I built my random wire antenna (also portable for SOTA but now installed on my balcony until the COVID – 19 emergency is over).

The attached videos show the situation in comparison with my BONITO MINI WHIP active antenna (also installed inside my house). Recently I changed my QTH and unfortunately here I have a lot of interference both on MW and SW. The better results that you can hear are achieved with my NCPL antenna.

I have made this test with my ICOM IC R 71 E + BHI noise cancellation speaker…..you can assess yourself, the better results that you can hear are achieved with the NCPL antenna and in the case of Tecsun PL-660 without any noise cancelling filter (BHI speaker off).

Thanks for sharing this, Patrizio! As you say, the NCPL loop seems to do a fine job helping to eliminate local RFI/QRM. The Bonito Mini Whip is a fine antenna, but not optimal for environments with a lot of radio noise–that’s where the NCPL antenna really shines.

You also make a good point that if you’re simply experimenting and only using an antenna for receiving, you can be more relaxed about the build because you’re not sending RF through it. In the end, however, properly soldered and protected connections will last much longer and provide better, more reliable performance.

Thank you, again, for sharing your build, Patriio! Those reception results speak for themselves!

Using Adobe on Android to read The Spectrum Monitor magazine

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Many thanks to SWLing Post contributor, Bill Hemphill, who writes:

I was very happy to see your post about The Spectrum Monitor magazine. Like you, I am a big fan of it and have subscribed for several years and have purchased the archived years.

Usually, I am not a fan of digital magazines. They either are in special formats requiring special programs or even special versions of Acrobat. Like you, I was happy to see that it is in standard PDF format.

But that still brought up a problem. With my eyesight, I need to zoom in on the page to read it, even when using a 10” tablet and definitely if using a smaller screen such as my phone. Normally it means panning around the page, reading column one down and then going back to the top of the page to read the second or third column.

But there is some good news that many people may not be aware of. The Acrobat Reader app on the Android system allows for a mode called “Reading Mode”. What reading mode does is stack the columns up into a single column thus allowing for reading straight down – no more scrolling back to the top of the next column. And you can tap on the screen to enlarge the text and the text will reformat in a larger font to fit the margins of the screen.

I took some screen shots of TSM using Adobe Reader on my Android phone.

On the left is the complete page, on the right I have tapped on the page and while it enlarged it, I now need to scroll around to read it:

Following screen shot shows the “View Setting” Settings and “Page-by-Page” is the default setting.

What you want do is change this to “Reading Mode”:

Once you have selected “Reading Mode” you will find that the columns are now stacked vertically and you can read my just scrolling down. No more going back to the top for the next column. Also, taping on the text will enlarge it and reflow it to fit the device screen.

Left screen shot is after selecting “Reading Mode” and right is after tapping the screen to enlarge the text:

With Reading Mode, I find I can even read TSM on my Cell Phone Screen as well as my tablets.

Note: Reading Mode only works with PDF’s that have been created with this is mind. It obviously won’t work with PDF’s created from scans.

Unfortunately, while there is a “Read Mode” in Acrobat Reader DC for Windows, it does not stack the columns like the Android version does. I’m not sure if the Acrobat Reader for iPhone works the same way as Android.

Hope this is of help to others.

73
Bill Hemphill
WD9EQD
Smithville, NJ

Thank you so much, Bill, for sharing your tip! You make a really good point, too, that PDF publications give you the flexibility to change text size and adjust layout through Adobe Reader so that it’s quite easy to read even on a small device. I’m also a huge fan of PDF documents and wish other radio publications would consider adopting the PDF format instead of replying on proprietary readers and apps.

Click here to check out The Spectrum Monitor magazine. 

Spectres of Shortwave: Amanda Dawn Christie’s film about RCI Sackville now streaming

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IMPORTANT UPDATE – Amanda Dawn Christie notes:

“Unfortunately [this video] was never supposed to be public – it was an accident on my part. The film will be viewable soon though, for seven days. May 26 to June 1. It is being hosted by a gallery in Montreal. That upload was only a test for them, and should never have been public. I was in a hurry, trying to get it uploaded before I packed my hard drives before I moved and I guess I didn’t check all the settings. Sorry about that. I appreciate the enthusiasm though.”

SWLing Post friend and filmmaker, Amanda Dawn Christie, has just uploaded a version of her film Spectres of Shortwave to Vimeo where it can be viewed free of charge:

Click here to watch on Vimeo.