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((Short description|National holiday in Russia on 7 May))
((refimprove|date=April 2012))
((For|the film|Radio Day (film)))
((Infobox holiday
|holiday_name  = Radio Day
|type          = 
|image         =1958 CPA 2155.jpg
|imagesize     =
|caption       = Radio Day
|official_name =
|nickname      = Communications Workers' Day (in [[Russia]]), Radio and Television Day (((lang|bg|Ден на радиото и телевизията)), in [[Bulgaria]])
|observedby    = [[Soviet Union]], [[Russia]], [[Bulgaria]]
|litcolor      =
|longtype      =
|significance  =
|begins        =
|ends          =
|date          = 7 May
|scheduling    = same day each year
|duration      = 1 day
|frequency     = annual
|celebrations  =
|observances   =
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))

'''Radio Day'''<ref>((Cite web|url=https://etu.ru/en/university/news/radio-day|title=Radio Day|website=SPbETU “LETI”|access-date=2019-05-08))</ref> (((lang-ru|День радио)), ''Den' Radio''), '''Communications Workers' Day''' (as it is officially known in [[Russia]]) or '''Radio and Television Day''' (((lang-bg|Ден на радиото и телевизията)), as it is known in [[Bulgaria]]) is a commemoration of the development of [[radio]] in Russia. It takes place on 7 May, the day in 1895 on which [[Alexander Stepanovich Popov]] demonstrated a radio based lightning detector.

==Origins==
((further|Alexander Stepanovich Popov#Demonstrations))

On 7 May 1895, Alexander Stepanovich Popov presented the paper "On the Relation of Metallic Powders to Electric Oscillations" before the Russian Physical and Chemical Society in St. Petersburg, which described his [[radio wave]] based device that used Sir [[Oliver Lodge|Oliver Lodge's]] [[coherer]] as a [[lightning]] detector.<ref name="Christopher H. Sterling 2003">Christopher H. Sterling, ''Encyclopedia of Radio'', Routledge – 2003, p. 1820</ref> Popov's device was just a radio receiver, he would not develop a radio transmitter until over a year later (a year and a half after [[Guglielmo Marconi]] developed a similar device.<ref name="Huurdeman">((cite book
  | last = Huurdeman
 | first = Anton A.
 | title = The Worldwide History of Telecommunications
 | publisher = John Wiley and Sons
 | date = 2003
 | location = 
 | pages = 205–207
 | url = https://books.google.com/books?id=SnjGRDVIUL4C&pg=PA206
 | doi = 
 | id = 
 | isbn = 0471205052))  A picture of Popov's receiver appears on p. 207, fig. 12.2</ref><ref>Sungook Hong, ''Wireless: From Marconi's Black-box to the Audion'', p. 1</ref>

Popov's presentation was declared the "[[Invention of radio|inventor of radio]]" in the former [[Soviet Union]] and Eastern Europe (although historians note it may be more due to [[Cold War]] era politics than historical evidence).<ref>Sungook Hong, ''Wireless: From Marconi's Black-box to the Audion'', p. 1</ref> The first Radio Day was observed in the Soviet Union in 1945, on the 50th anniversary of Popov's experiment, and some four decades after his death. Radio Day is officially marked in Russia and Bulgaria.

==See also==
* [[Telecommunications in Russia]]
* [[World Radio Day]]

==References==
((reflist))

==External links==
*[http://www.ieeeghn.org/wiki/index.php/Aleksandr_Popov IEEE – Popov's Contribution to the Development of Wireless Communication, 1895]
*[http://news.bbc.co.uk/2/hi/europe/88802.stm BBC News – Russia: mother of invention?]
*[http://www.calend.ru/holidays/0/0/39/ Calend.ru – День радио] (in Russian)
*[http://www.worldradioday.org]
*[http://www.bnnrc.net]

[[Category:May observances]]
[[Category:September observances]] 
[[Category:Observances in Russia]]
[[Category:Public holidays in the Soviet Union]]
[[Category:Telecommunications in Russia]]
[[Category:Communications in the Soviet Union]]
[[Category:Spring (season) events in Russia]]

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