Tag Archives: Mediumwave

Inaugural DX Central MW Daytime Challenge starts today!

Many thanks to SWLing Post contributor Loyd Van Horn at DX Central who shares the following announcement:

The Inaugural DX Central MW Daytime Challenge

What a great season of DX Central Live! and the MW Frequency Challenge it has already been and we are just getting started! This season, you helped us cross 1,000 subscribers on our YouTube channel, have brought in a record number of MW Frequency Challenge submissions thus far, and have helped to generate a lot of energy around this DX season! We couldn’t do it without your support, so thank you!

First, a little housekeeping. We will be taking some time off to spend the holidays with family and of course – some DX! As such, there will be no DX Central Live! on Friday, December 23 or 30th. We will return on Friday, January 6, 2023.

Also during this time, we will be taking a brief pause on our weekly MW Frequency Challenge as well. I will be announcing the results from week 12 (576-600) when we return on Jan 6, as well as the next frequency range at that time.

Don’t worry, we have a challenge for our little break that should provide all of the fun and difficulty to push DXers to scratch new ones in their logbooks: The Inaugural DX Central MW Daytime Challenge.

The premise: Log as many stations as you can during daytime conditions. That’s it!

Nothing but daytime DX (period from 2 hours after local sunrise to 2 hours prior to local sunset) starting at 0200 UTC Saturday, December 17 and ending at 0200 UTC Monday, January 2, 2023. This challenge is open to all DXers around the world!

A few rules:
– Loggings must be during your local daytime period (2 hours after local sunrise to 2 hours prior to local sunset)
– Loggings must be from between 0200 UTC Saturday, December 17th and 0200 UTC Monday, January 6.
– Any stations are allowed for this challenge: local stations, TIS/HAR, part 15 transmitters not to mention anything distant you might be able to pull in!
– Stations do not need to be “new to you”, relogs are allowed
– Stations need to be on any mediumwave frequency between 530-1710 kHz.
– Loggings should be from a location within 50 miles of your home location. This includes use of online SDRs, portable operations, etc.
– If you are traveling for the holidays and will be away from home but have access to either your station remotely or another online SDR from your home location, those submissions will be allowed.
– Only submissions made using the Google Form sheet (link below) will be considered for the challenge. Social media posts, emails, etc will not count.

Categories for this challenge will include US and international versions of:
– Most stations logged
– Most US States/Canadian Prov logged
– Most countries logged
– Furthest reception
– Most frequencies with at least one logged station

Google Form for entries: https://forms.gle/TVgCPrHMpfDAzbzb6

I hope this challenge will be a fun one for all!

To all of our fellow DXers, supporters, family, friends….Merry Christmas, Happy Holidays and may your logbooks be filled with DX and your hearts filled with joy and love!

73,

Loyd Van Horn
W4LVH – Mandeville, LA

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Giuseppe experiments with mediumwave loop induction

Giuseppe upcycles and improves a homebrew MW antenna

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Many thanks to SWLing Post contributor, Giuseppe Morlè (IZ0GZW), who shares the following:

Dear Thomas and Friends of SWLing Post …

This is Giuseppe Morlè. As always, I try recycling what I have and improving upon antennas I’ve built in the past. This is one way we radio lovers can experiment. Many years ago, I made an antenna only for medium waves; by adding a circuit, I can now listen to short waves.

I took advantage of a small frame that I recovered from an old commercial FM / AM stereo receiver by removing its coils for medium waves and I wound around it only two coils sufficient to have a frequency range from 3.5 to 18 MHz.

I remember that the antenna in question also receives medium waves as it was born.

I chose this small frame because I wanted everything to be small in order to carry this compact antenna everywhere.

Unlike my other projects for SW and MW, which have a cable that carries the SW signal to the receiver, this time I used the induction that is created around one end of the loop, which I spiraled to get inside the stylus of my Tecsun PL-660 and which then transfers the signal to the receiver.

I did some tests on my balcony the day after a strong storm and I noticed that the propagation was absent but I still wanted to make sure that everything was working.

[Note that you can translate this video into your language via YouTube’s automatic subtitles. Click here to learn how to do this.]

I will keep you updated on other tests on more favorable days of propagation … I still invite you to follow me on my Youtube channel.

I wish everyone a good listening …
73. Giuseppe Morlè iz0gzw.

Many thanks, Giuseppe. I, for one, love all of your homebrewed and recycled antennas. This one is no exception! What a fun project. I love how you use what you have and aren’t afraid to experiment! Thank you for sharing.

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File this under: you never know and . . . what’s the harm in experimenting?

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by Jock Elliott, KB2GOM

Ever since Thomas (our Maximum Leader) posted the latest DX Central MW Challenge, I’ve been curious . . . what could I hear if I gave it a shot?

Habitually, I get up early, between 4 and 5 am, so I decided to give it a try. Conventional wisdom is that, if you want to do AM (medium wave) DXing, you need a hot AM radio with a big ferrite bar, like the CCrane 2E . . .

Wanna guess what radio and antenna combo acquitted itself pretty well?

My old ham rig, an Icom IC-706 MkIIG, (which I wrote up here), hooked to my 50-foot wire indoor antenna, the horizontal room loop (which I wrote up here).

This AM’s listening, from my home outside Troy, NY, produced:

1170, WWVA — Wheeling, West Virginia
1180, WHAM — Rochester, NY
1200, Talk 1200 — Boston
1210, WPHT — Philadelphia

Now, before you hard-core AM DXers get all up in my face — Hey, I could hear those stations on the fillings in my teeth! — I’ll simply say that I get a kick out of hearing a distant station . . . any distant station . . . even it’s just a few hundred miles away. Sure, it’s not the astonishing stuff that Paul Walker and Gary DeBock accomplish, but to hear that faraway signal, crackling through the airwaves does me good.

Bottom line: you don’t need the latest and greatest optimized-for-the-task gear to give something a try . . . and you just might really enjoy it!

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The AMT-MW207 mini AM radio transmitter kit

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Many thanks to SWLing Post contributor, Frans Goddijn, who shares the following video demonstrating the AMT-MW207: a tiny $25 mediumwave transmitter kit that can be purchased on AliExpress:

To be clear, the AMT-MW207 is not designed to be a whole house AM transmitter like the SSTran and others.

The seller describes it as a device to debug and test AM receivers. Since it only employs a built-in bar antenna, the transmitter would need to be placed in close proximity to the receiver.

Click here to view on AliExpress.

Thanks for the tip, Frans!

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Fun with “The Radio Boys”

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By Jock Elliott, KB2GOM

Back in April of this year (2022), I accidentally discovered The Radio Boys series of books, many of which are available for free if you have an Amazon Kindle.

These books, I believe, are intended for young adults, and, in my mind, they very much resemble The Hardy Boys series of books: a group of high school friends have adventures and discover the wonders of radio together. Think “The Hardy Boys go all-in for radio,” and you have the right idea.

If you are looking for sophisticated plots, deep character development, and a lyrical turn of phrase, you will be disappointed. But if you a looking for a light-hearted adventure with deep enthusiasm for radio, I think you will be pleased.

But what makes these books really cool is that they were written and copyrighted 100 years ago, in the early 1920s. Yes, some of the language and attitudes are somewhat antiquated, but what is fascinating is the window they offer on radio a century ago.

My knowledge of radio history is very limited, but it is my understanding that radio was just beginning to be popular in American culture in the early 1920s, The Radio Boys books reflect this. The first book, The Radio Boys’ First Wireless Or Winning the Ferberton Prize, gives fairly detailed instructions for making your own radio receiver with materials you could get (in the early 1920s) from the local hardware store.

At various points in the books, The Radio Boys extol the virtues of radio: people could hear concerts in the comfort of their own homes or listen to baseball games; if there were radios in cars, travelers could keep track of weather reports; it was a novelty when a minister broadcast the church service; college professors could broadcast their lectures, and so forth. I find the books offer a charming perspective on what we take for granted today.

And, if you have an Amazon Kindle, many of The Radio Boys books are available at no cost.

Click here to check out some of The Radio Boys titles on Amazon.com.

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Radio Waves: DRM Demo in Australia, Decoding the JWST, the ARDC, and EV Makers Dropping AM Radio

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Radio Waves: Stories Making Waves in the World of Radio

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

Australia Demonstrates DRM on AM, FM (Radio World)

Since September 2020, ABC Radio has been quietly trialing DRM technology in Victoria

The public-service Australian Broadcasting Corp. and its transmission contractor BAI Communications Transmission Network hosted a public demonstration of Digital Radio Mondiale broadcasts on June 29, 2022. ABC highlighted the use of DRM on both AM and FM in Wagaratta, Victoria.

According to the DRM Consortium, the demonstration was the culmination of almost two years of COVID-impacted work to assess the performance of DRM services in Australia’s VHF and medium-wave bands.

Previously, the Australian Amateur Radio Experimenters Group reported that AREG member Steve Adler (VK5SFA) had been monitoring “a very un-publicized Digital Radio Mondiale (DRM) trial” on 747 kHz from Wangaratta in August 2021.

The Australian Communications and Media Authority provided ABC with a license variation to conduct the DRM 30 trials from September 1, 2020, to August 31, 2022.

At the public demonstration, senior representatives from the public, commercial and community radio sectors, along with regulators and other interested parties, were able to hear and see the capabilities of DRM broadcasting on AM from Dockers Plains and on FM from Mount Baranduda. They were also able to review the transmission equipment at Wagaratta.[Continue reading…]

Also check out the DRM Consortium’s article on this same topic.

Decoding James Webb Space Telescope (Daniel Estévez)

The James Webb Space Telescope probably needs no introduction, since it is perhaps the most important and well-known mission of the last years. It was launched on Christmas day from Kourou, French Guiana, into a direct transfer orbit to the Sun-Earth L2 Lagrange point. JWST uses S-band at 2270.5 MHz to transmit telemetry. The science data will be transmitted in K-band at 25.9 GHz, with a rate of up to 28 Mbps.

After launch, the first groundstation to pick the S-band signal from JWST was the 10 m antenna from the Italian Space Agency in Malindi, Kenya. This groundstation commanded the telemetry rate to increase from 1 kbps to 4 kbps. After this, the spacecraft’s footprint continued moving to the east, and it was tracked for a few hours by the DSN in Canberra. One of the things that Canberra did was to increase the telemetry rate to 40 kbps, which apparently is the maximum to be used in the mission.

As JWST moved away from Earth, its footprint started moving west. After Canberra, the spacecraft was tracked by Madrid. Edgar Kaiser DF2MZ, Iban Cardona EB3FRN and other amateur observers in Europe received the S-band telemetry signal. When Iban started receiving the signal, it was again using 4 kbps, but some time after, Madrid switched it to 40 kbps.

At 00:50 UTC on December 26, the spacecraft made its first correction burn, which lasted an impressive 65 minutes. Edgar caught this manoeuvre in the Doppler track.

Later on, between 7:30 and 11:30 UTC, I have been receiving the signal with one of the 6.1 metre dishes at Allen Telescope Array. The telemetry rate was 40 kbps and the spacecraft was presumably in lock with Goldstone, though it didn’t appear in DSN now. I will publish the recording in Zenodo as usual, but since the files are rather large I will probably reduce the sample rate, so publishing the files will take some time.

In the rest of this post I give a description of the telemetry of JWST and do a first look at the telemetry data. [Continue reading…]

Helping Secure Amateur Radio’s Digital Future (Hackaday)

The average person’s perception of a ham radio operator, assuming they even know what that means, is more than likely some graybeard huddled over the knobs of a war-surplus transmitter in the wee small hours of the morning. It’s a mental image that, admittedly, isn’t entirely off the mark in some cases. But it’s also a gross over-simplification, and a generalization that isn’t doing the hobby any favors when it comes to bringing in new blood.

In reality, a modern ham’s toolkit includes a wide array of technologies that are about as far away from your grandfather’s kit-built rig as could be — and there’s exciting new protocols and tools on the horizon. To ensure a bright future for amateur radio, these technologies need to be nurtured the word needs to be spread about what they can do. Along the way, we’ll also need to push back against stereotypes that can hinder younger operators from signing on.

On the forefront of these efforts is Amateur Radio Digital Communications (ARDC), a private foundation dedicated to supporting amateur radio and digital communication by providing grants to scholarships, educational programs, and promising open source technical projects. For this week’s Hack Chat, ARDC Executive Director Rosy Schechter (KJ7RYV) and Staff Lead John Hays (K7VE) dropped by to talk about the future of radio and digital communications. [Continue reading…]

Interference causes EV makers to drop AM radio (Radio World via the Southgate ARC)

Radio World reports the Electromagnetic Interference generated by Electric Vehicles is causing some EV automakers to drop AM (medium wave) radio

The article says:

Some EV automakers are dropping AM altogether due to audio quality concerns, but that’s just one piece of the puzzle as radio continues to fight for space on the dash.

“As carmakers increase electric vehicle offerings throughout their lineups, the availability of AM radio to consumers is declining,” said Pooja Nair, communications systems engineer with Xperi Corp., in a Radio World guest commentary. “This is because the effects of electromagnetic interference are more pronounced in EVs than in vehicles with internal-combustion engines.”

In other words, electromagnetic frequencies generated by EV motors occupy the same wavelength as AM radio signals. The competing signals clash, effectively cancelling each other out. As EV motors grow more powerful, AM static tends to increase.

Read the full story at
https://www.radioworld.com/news-and-business/headlines/why-are-some-automakers-ditching-am-radio