United States

WBZ-AM 100 years.
On September 19, 1921, one of America’s oldest radio stations will celebrate its 100th anniversary. On Friday (6/11), the 100-day countdown began to a century of serving New England began for a station currently offering an all-News format, owned today by iHeartMedia.
https://wbznewsradio.iheart.com/featured/the-history-of-wbz-radio/content/2017-11-17-wbz-newsradio-1030-history-1920s/
WBZ-AM 1030, a Class-A 50kw directional facility using 2 towers on the opposite of Nantasket Beach, Mass., is the station already saluting itself. This will see on-air and online vignettes recalling the most memorable moments in the station’s history.
While the oldest Radio station WBZ in Boston is celebrating in New England  its 100th anniversary in 2021, The Billerica Amateur Radio Society, along with the Hampden County Radio Association in Springfield, will be commemorating this anniversary by conducting a special operating event starting at 1300z/9:00 AM EDT September 17 and ending at 0359z September 20/11:59 PM EDT September 19 WBZ began operations on September 15, 1921 at the Westinghouse Works building on Page Boulevard in East Springfield, Massachusetts broadcasting with just 100 watts. In 1931, Westinghouse moved the station to Boston; its 15,000-watt transmitter was moved to Millis. By 1933, Westinghouse increased WBZ’s power to 50,000 watts. In 1940, the transmitter was moved to Hull. The station was made famous with its slogan, “The Spirit of New England.” After WWI, wireless radio grew with an increase in ham radio operators. Amateurs greatly contributed to the advance of the radio arts. One of their contributions was the development of voice modulated radio signals, which used Amplitude Modulation (AM).
WBZ first broadcast using AM 100 years ago. For their efforts, amateurs were granted permanent privileges for frequencies in the 80-, 40-, 20-, and 10-meter shortwave bands by the International Treaty in 1927. The partnership of commercial broadcasting and amateur radio hobbyists was very beneficial to all.
Read more at https://nediv.arrl.org/wbz100/

Kari Kallio to nordx iog (2021-09-18)

Iceland

Google Translated:
On August 11, 2021, an old antenna system from AM broadcasting disappeared from the scene again. This time the long wave masts on the southeastern outskirts of Reykjavík, in the Vatnsendi district, were eliminated.

The two masts (they bundled the transmission energy according to the geographic extent of Iceland to the northeast) are said to have been built when radio operations began in 1930.

The transmitter system that was last used is a bit more recent and is also shown in a relevant article. It comes from Brown Boveri (Switzerland), had an output of 100 kW and was probably installed between 1950 and 1960.

The operation from Vatnsendi ended in the 1990s. It was replaced in 1997 by the 300 kW strong, now still operated with 100 kW transmitter Gufuskálar near Helissandur, in the far west of Iceland. A 412 meter high mast is used there, which was previously used by the Loran-C (100 kHz) navigation system, which was shut down here in 1994.

This move was associated with a frequency change. Instead of the old Reykjavík channel 207 kHz, the transmitter Gufuskálar operates on the frequency 189 kHz, as the only station in the world on this frequency.

A single wave operation once ran on 207 kHz – which was also the reason for the frequency change: The Eiðar transmitter worked in conjunction with Reykjavík-Vatnsendi, in the east of Iceland near Egilsstaðir.
[….]
All the article here in German with some nice photos from the Icelandic LW transmitting sites..

Radio Eins Radio-News (2021-08-13)

India

National Broadcasting Day: All India Radio came a long way since 1927.
It is true that today technology has made a lot of progress and information from different parts of the world is just a click away. But the journey was started with the Radio. In India, “National Broadcasting Day” is celebrated on 23rd July every year to make people aware of the importance of radio. Radio has been an important part of the lives of people in India. On this day in the year 1927, the broadcast of radio started from Bombay station for the first time in the country under a private company called Indian Broadcasting Company of India (IBC).
newsonair.com
Mike Terry to WRTH fb group (2021-07-23)

Canada

CJBQ 800 in Belleville turns 75 next month.
Welcome to the history of 800 CJBQ. Since August of 1946, CJBQ has proudly served as The Voice of Quinte. Join us as we celebrate 75 years of timeless music, breaking news, provocative talk and unforgettable personalities. Below, you will find some of our favourite memories. Which moments do you recall? Which voices from the past still echo in your ear? Scroll on for a stroll down memory lane and be sure to check back as we add more key moments from CJBQ’s history. Every memory below, we owe to our listeners. Thank you.
https://www.cjbq.com/cjbqs-75th-anniversary/?fbclid=IwAR2THBvP8tWQJT2G5SXYIdALX7JanSxTtgCdt7x8dE6NOADHeY5yHEhTSNg
Canadian Radio News fb group (2021-07-16)

United States

WBZ Celebrates 100 Years.
In Boston, WBZ NewsRadio [1030 kHz] has begun a 100-day celebration leading up to its 100-year anniversary.
The station, owned by iHeartMedia, passes the century mark on Sept. 19 and is thus one of the oldest in the United States. It originally was located in East Springfield, Mass., and first broadcast from Boston in 1924.
More on the story here.
Radio World (2021-06-11)

New Zealand

It will be 37 years to the day since the New Zealand radio station, now 1368AM [Village Radio], call sign Station 1XT, first commenced broadcasting from the village in 17th Avenue West. That occasion was to mark the city of Tauranga celebrating its 21st birthday.
On Tuesday April 13, the radio station will be “firing up” its original transmitter, says Station Manager George Stewart.
The 84 year old Collins one kilowatt transmitter was built at Cedar Rapids, Iowa, in the USA.
More about the story sunlive.co.nz
Mike Terry to WRTH fb group (2021-04-11)

United States

What Mediumwave DX sounded like in 1933: this video posted by the Antique Wireless Association features clips recorded by a UK DXer that year of mediumwave stations from the U.S. as received at his location. He was recording to aluminum disc, a process that involved “embossing” rather than cutting, as with lacquer discs. The audio (and reception) quality is pretty amazing: 
https://www.youtube.com/watch?v=R8YrRs5nWeQ.
Andy Robins, Kalamazoo, Michigan USA to WOR groups.io (2021-03-13)

More about this with same link:
http://www.southgatearc.org/news/2021/march/dxing-in-england-1933.htm
James Niven, Austin TX, nrc-am gg via WOR groups.io (2021-03-13)

United States

WLW-AM Begins 100th Year On Air.
It wasn’t Cincinnati’s first radio station, but WLW-AM [700 kHz] is still the biggest.
Cincinnati industrialist Powel Crosley, Jr. began broadcasting WLW-AM over a 20-watt station from his College Hill home on March 2, 1922 – which means that the station is entering its 100th year today.
https://www.wvxu.org/post/wlw-am-begins-100th-year-air?fbclid=IwAR3XY7x_5gCJUeBaMwjqL3P4UebXkP8WvR5HNE1XELPRBqmQsoU1xaxqiPQ#stream/0
IRCA fb group (2021-03-09)

Argentina & Finland

Radio in Argentina
Argentina was a world pioneer in broadcasting, being the third country in the world to make its first regular broadcasts in 1920, having been the first Spanish-speaking country in Latin America to offer daily radio broadcasts. The main stations were in Buenos Aires and Córdoba.
In 1921, the transmission of classical music became a daily occurrence. The following year, the assumption of President Marcelo Torcuato de Alvear was broadcast live.
Also at that time the first advertisements, called “reclames”, were put on the air. At the end of the decade the radio drama was born.
The introduction of the loudspeakers substantially modified the listening conditions. The receiving apparatus was gaining an important place in the home, gathering around the family. Meanwhile, the multiplication of the stations generated the first conflicts over the airwaves, which led to the first regulations on emission frequencies at the end of the 20s.

Finland 1921
Finnish Amateur Radio League is a national non-profit organization for amateur radio enthusiasts in Finland was founded in 1921 and has today approximately 5,000 members.
Finnish Radio Association, Finlands Radioförening was a private association founded in Helsinki in 1923 to promote only the interests of radio listeners. The association also passed listening permits to its members.
The organization had about ten local member associations of radiohobbyists around the country. Each local association also owned its own small radio station to serve so-called close listening. The first actual broadcasting station of this organization started operating in Finland in 1923 in Tampere.
Incidentally, nearly all tube radio listeners were already familiar with most European radio stations at that time. Ylisradio was later established in 1926 by merging all those small radio stations into the same broadcasting company whose 1st own powerful Lahti longwave station began broadcasting in 1928.
Kari Kallio (2021-03-05)

Lithuania

On Sunday evening (24 January 2021), it was announced that Rimantas Pleikys  (1958-2021), a journalist, political figure and founder of several radio stations, had died at the age of 64. He was the founder of M-1 (*1989), Radio Centras (*1990) and Radio Baltic Waves International (*2000). It was during his tenure as member of the Lithuanian parliament that he proposed a Radio Free Belarus, modelled after Radio Free Europe. The public response was unexpectedly negative, because the public did not want a deterioration of relations with the Eastern neighbour. Under a new name his project is still on the air on 1386 kHz with relays in Russian for RFE/RL and NHK World Radio Japan and in several languages for Polskie Radio.  Rimantas Pleikys was also instrumental in saving the short wave station at Sitkunai by a new 100 kW short wave transmitter and a new curtain array. The new facility ended broadcasting in 2017.
Obituaries can be found at
https://www.15min.lt/naujiena/aktualu/lietuva/premjere-reiskia-uzuojauta-del-zurnalisto-politiko-rimanto-pleikio-mirties-56-1444738
The google translation into English seems to reproduce the original fairly well.
Dr Hansjoerg Biener (2021-01-26)