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Many thanks to SWLing Post contributor, Jerome van der Linden, who writes:
Hello Thomas,
In asking the manufacturer of the inverter for the solar array on our house what I might be able to do to reduce the EMI coming out of it, he gave me some Googling ideas, which led me to the following article which I think is worth passing on to others:
I was particularly interested in the sentence: Conversely, inverters connect to AC circuits in the home, turning every inch of the house wiring into an antenna that radiates the interference.
The guy who wrote the article has a lot of experience in chasing down this problem.
Cheers
Jerome van der Linden
Thanks for sharing this, Jerome. As more and more homes install solar solutions, tracking down sources RFI has certainly become an art form. When we installed our rather simple PV system over a decade ago, our installer stuck with telephony approved gear–charge controllers, etc. that are often used in communication central offices.
Many thanks to SWLing Post contributor, Mike (VE3MKX), for sharing over 100 photos from the 2023 Hamcation, the majority of which are from the flea market. If you would like to view this gallery of photos, click the link below:
Today is UNESCO World Radio Day and this year the theme is “Radio and Peace.” Here’s the announcement from UNESCO:
Proclaimed in 2011 by the Member States of UNESCO, and adopted by the United Nations General Assembly in 2012 as an International Day, February 13 became World Radio Day (WRD).
Radio is a powerful medium for celebrating humanity in all its diversity and constitutes a platform for democratic discourse. At the global level, radio remains the most widely consumed medium. This unique ability to reach out the widest audience means radio can shape a society’s experience of diversity, stand as an arena for all voices to speak out, be represented and heard. Radio stations should serve diverse communities, offering a wide variety of programs, viewpoints and content, and reflect the diversity of audiences in their organizations and operations.
World Radio Day 2023
The theme for the 12th edition of the World Radio Day, to be celebrated on 13 February 2023, is “Radio and Peace“.
War, as an antonym to peace, signifies an armed conflict between countries or groups within a country, but may also translate into a conflict of media narratives. The narrative can increase tensions or maintain conditions for peace in a given context – for instance weigh in on the rough or smooth conduct of elections, the rejection or integration of returnees, the rise or tempering of nationalistic fervour, etc. In reporting and informing the general public, radio stations shape public opinion and frame a narrative that can influence domestic and international situations and decision-making processes.
Radio can indeed fuel conflict but in reality, professional radio moderates conflict and/or tensions, preventing their escalation or bringing about reconciliation and reconstruction talks. In contexts of distant or immediate tension, relevant programmes and independent news reporting provide the foundation for sustainable democracy and good governance by gathering evidence about what is happening, informing citizens about it in impartial and fact-based terms, explaining what is at stake and brokering dialogue among different groups in society.
“… since wars begin in the minds of men, it is in the minds of men that the defences of peace must be constructed.”
That is the reason why support to independent radio has to be viewed as an integral part of peace and stability. On World Radio Day 2023, UNESCO highlights independent radio as a pillar for conflict prevention and peacebuilding.
The impact of community radio: World Wide Waves 2023
As mentioned in a previous post, in celebration of World Radio Day 2023, our friend David Goren has produced another amazing World Wide Waves episode with Maria Margaronis presenting. You can listen to the audio of the full documentary via BBC Sounds, or The Documentary website once it has aired:
(Image source: BBC World Service, The Documentary)
The Documentary
For World Radio Day, we celebrate four vibrant community radio stations on four continents, tuning in to their sounds, their music, and their missions. Northern Malawi’s Rumphi FM supports the Tumbuka tribe while giving young women a space to speak out against early marriage and for education.
From Budapest, Radio Dikh broadcasts “about the Roma, but not just for the Roma,” presenting Romany culture in its own distinctive voice.
In Nunavik, Northern Quebec, Inuit radio beams Inuktitut music and talk to 14 remote villages, helping to keep an ancient language and threatened tradition alive.
And in civil-war-torn Myanmar, brave journalists risk their lives to resist the military dictatorship with news and views sent out from portable transmitters, sometimes under fire.
If you own a GE Superadio I or Superadio II and you would like an expert to restore and/or replace the capacitors, you’re in luck!
Chuck Rippel (K8HU) has announced that he will start repairing and restoring GE Superadios for anyone interested. In the past, he’s done this on a case-by-case basis when time allowed, but he has stocked up on top-shelf components and cleared off his workbench to bring Superadios back to life.
Chuck asks that you contact him via email if you would like your Superadio recapped or repaired.
You can reach Chuck at:
A note about the Superadio III
As mentioned above, Chuck only works on the SRI and SRII models.
Chuck notes that the issue with repairing SRIIIs is: “[working with] the tuning mechanism and putting it back together so it works and the dial is in reasonable calibration. If the dial cord comes off, it’s terrible to tray and re-install so, I stay away from model III’s.“
Many thanks to SWLing Post contributor, Paul Jamet, who shares the following article that was originally published in the Radio Club du Perche Newsletter.
Note that Paul also includes information about the new XHDATA D-109 and an XHDATA sale in the addendum of his article!
Let’s discover the XHDATA D-219
by Paul JAMET
A truly incredible performance/price ratio
A year ago, many people wondered if it was wise to resume short wave broadcasts to Russia and Ukraine (CIRAF Zone 29). Although a century old, this technology is still widely used around the world. Moreover, the world market for Short Wave receivers is apparently doing well because new models are regularly arriving on the market, in particular ultra-portable DSP receivers with surprising performance. As proof, the latest XHDATA model: the D-219, marketed since November 2022. This is a very easy-to-use receiver, with a vintage look and a needle dial, which is available in gray or silver, for less than $7 (excluding shipping and batteries) on the XHDATA company website.
The D-219 is a “Full DSP” receiver which allows it to be very sensitive and power efficient. It is powered by two AA/R6 rechargeable batteries or by the mains (batteries and 220/5.0 volt adapter not supplied). A small multilingual manual – including French – is provided.
From my point of view, the most important innovation – on a DSP receiver of this price – is the possibility of precise tuning when searching for stations with a pointer dial; there is absolutely no play, which allows perfect and stable tuning to the desired frequency. This receiver has a 3.5 mm jack, a rear stand and a hand strap. The 7-core telescopic antenna is about 55 cm long and provides good reception of FM and SW stations. The sound quality is very good for this 150g receiver (without batteries)! It has two FM bands (87-108 and 64-87 MHz), the AM band (Medium Waves) from 522 to 1620 kHz and nine SW bands from 4750 to 22000 kHz. See photo above.
For a SWL, it’s a real pleasure to explore the 9 Short Wave bands. For instance, I have already easily tuned to international stations several thousand kilometers away only with the telescopic antenna, such as RFA – Radio Free Asia – broadcasting from Agignan Point and Tinian Island in the Pacific Ocean.
Note: A 23-foot wire antenna was clipped onto the whip antenna recordings made by placing my smartphone near the speaker of the receiver.
QSLs
I received two QSLs (Year of the Rabbit) sent by RFA. See attached images below. These QSL confirm my reception reports (recordings made with the XHDATA D-219 and sent to RFA)
Summary
In conclusion, the XHDATA D-219 is really very easy to use. I can only recommend it to anyone who wants to start exploring the wide world of shortwave with a receiver that offers a truly amazing performance/price ratio!
Paul JAMET
NB: DSP technology – Digital Signal Processing – allows, among other things, to reduce noise and limit distortion; it is perfectly adapted to the processing of radio signals.
Addendum: XHDATA sale and new D-109
1.) The RADIWOW web site is no longer updated and will be closed soon
30% discount on D-808 (65$) and R-108 (37.80$) for instance, till Feb, 16th.
In celebration of the upcoming World Radio Day 2023, our friend David Goren has produced another amazing World Wide Waves episode with Maria Margaronis presenting. You can listen live, but the audio will also be linked to The Documentary website once it has aired:
(Image source: BBC World Service, The Documentary)
The Documentary
For World Radio Day, we celebrate four vibrant community radio stations on four continents, tuning in to their sounds, their music, and their missions. Northern Malawi’s Rumphi FM supports the Tumbuka tribe while giving young women a space to speak out against early marriage and for education.
From Budapest, Radio Dikh broadcasts “about the Roma, but not just for the Roma,” presenting Romany culture in its own distinctive voice.
In Nunavik, Northern Quebec, Inuit radio beams Inuktitut music and talk to 14 remote villages, helping to keep an ancient language and threatened tradition alive.
And in civil-war-torn Myanmar, brave journalists risk their lives to resist the military dictatorship with news and views sent out from portable transmitters, sometimes under fire.
A new ultra-low-power method of communication at first glance seems to violate the laws of physics. It is possible to wirelessly transmit information simply by opening and closing a switch that connects a resistor to an antenna. No need to send power to the antenna.
Our system, combined with techniques for harvesting energy from the environment, could lead to all manner of devices that transmit data, including tiny sensors and implanted medical devices, without needing batteries or other power sources. These include sensors for smart agriculture, electronics implanted in the body that never need battery changes, better contactless credit cards and maybe even new ways for satellites to communicate.
Apart from the energy needed to flip the switch, no other energy is needed to transmit the information. In our case, the switch is a transistor, an electrically controlled switch with no moving parts that consumes a minuscule amount of power. [Continue reading…]
It’s about paid subscriptions — to the manufacturer, not the radio station
Apps for everything from optional equipment to entertainment is a big attraction for auto manufacturers.
For AM or even FM radio in cars, the solution could be worse than the problem: When manufacturers stop including radio as an in-console function, the workarounds make radio less local and face unimaginable competition, but what will roll out next is even more concerning.
The straight scoop
AM interference in electric vehicles, leaving radio out of the entertainment center, making radio more difficult to access — these are the real problems that the radio industry now faces.
Fact: Electromagnetic fields generated in non-gasoline engines make AM virtually unlistenable, spurring manufacturers to leave it out.
FM is more resistant to electromagnetic fields so for the present it survives.
Ford’s popular F-150 Lightning, Tesla, Volvo, Porsche and Audi have removed AM from their electric cars.
Tesla will sell consumers an app to get radio or satellite radio for a rental fee through internet delivery that gets around the electromagnetic interference. [Continue reading…]